Antibodies and antibody-drug conjugates thereof
Patent Information
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-05-23
- Publication Date
- 2026-04-08
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Figure PCTCN2024094976-FTAPPB-I100001 
Figure PCTCN2024094976-FTAPPB-I100002 
Figure PCTCN2024094976-FTAPPB-I100003
Abstract
Description
ANTIBODIES AND ANTIBODY-DRUG CONJUGATES THEREOFField of the InventionThe present disclosure relates to an antibody binding to cadherin-17 or an antigen binding fragment thereof, an immunoconjugate comprising the antibody or an antigen binding fragment thereof, a pharmaceutical composition comprising the antibody or an antigen binding fragment thereof or the immunoconjugate, and methods and therapeutic uses of the antibody or an antigen binding fragment thereof or the immunoconjugate.Background of the InventionCadherin-17 (CDH17) , also known as liver-intestine cadherin, is specifically expressed in intestinal epithelial cells and a small fraction of stomach cells. However, there is evidence showing that expression of CDH17 is increased in several gastrointestinal tumors including colorectal cancer, pancreatic cancer, esophageal cancer, gastric cancer, cholangiocarcinoma, small intestine cancer, liver cancer and the like. The limited expression of CDH17 in normal human tissues and high expression of CDH17 in tumors makes it an ideal target for antibody-based therapeutics. Currently, there are some bispecific antibody products under investigation in phase I clinical trials (NCT04137289, and NCT05411133) .Therefore, there remains a need for improved methods for treating cancers.SummaryIn one aspect, provided is an antibody binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody or the antigen binding fragment thereof specifically binds to a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128 or in SEQ ID NO: 166.In some embodiments, provided is an antibody binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody has competitive binding activity with the polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128 or in SEQ ID NO: 166 against an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence selected from a group consisting of SEQ ID NO: 1, 3, 5, 19, 21, 23, 25, 27, 37, 39, 41, 170, 174, and an amino acid sequence having at least 80%sequence identity to each thereof, and a light chain variable region having an amino acid sequence selected from a group consisting of SEQ ID NO: 2, 4, 6, 29, 31, 33, 35, 43, 45, 47, 172, 176, and an amino acid sequence having at least 80%sequence identity to each thereof.In some embodiments, provided is an antibody binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody has competitive binding activity with the polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128 or in SEQ ID NO: 166 against an anti-CDH17 antibody selected from a group consisting of:an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 1 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 1, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 2 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 2;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 3 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 3, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 4 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 4;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 5 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 5, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 6 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 6;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 19 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 19, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 29 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 29;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 21 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 21, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 31 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 31;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 23 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 23, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 33 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 33;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 19 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 19, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 35 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 35;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 25 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 25, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 35 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 35;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 27 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 27, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 35 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 35;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 37 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 37, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 43 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 43;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 39 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 39, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 45 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 45;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 41 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 41, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 47 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 47;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 170 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 170, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 172 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 172; andan anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 174 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 174, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 176 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 176.In some embodiments, provided is an antibody binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody has competitive binding activity with the polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128 or in SEQ ID NO: 166 against an anti-CDH17 antibody selected from a group consisting of:an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 7 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 7, and a light chain having an amino acid sequence shown in SEQ ID NO: 8 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 8;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 9 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 9, and a light chain having an amino acid sequence shown in SEQ ID NO: 10 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 10;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 11 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 11, and a light chain having an amino acid sequence shown in SEQ ID NO: 12 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 12;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 20 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 20, and a light chain having an amino acid sequence shown in SEQ ID NO: 30 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 30;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 22 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 22, and a light chain having an amino acid sequence shown in SEQ ID NO: 32 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 32;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 24 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 24, and a light chain having an amino acid sequence shown in SEQ ID NO: 34 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 34;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 20 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 20, and a light chain having an amino acid sequence shown in SEQ ID NO: 36 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 36;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 26 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 26, and a light chain having an amino acid sequence shown in SEQ ID NO: 36 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 36;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 28 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 28, and a light chain having an amino acid sequence shown in SEQ ID NO: 36 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 36;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 38 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 38, and a light chain having an amino acid sequence shown in SEQ ID NO: 44 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 44;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 40 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 40, and a light chain having an amino acid sequence shown in SEQ ID NO: 46 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 46;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 42 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 42, and a light chain having an amino acid sequence shown in SEQ ID NO: 48 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 48;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 171 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 171, and a light chain having an amino acid sequence shown in SEQ ID NO: 173 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 173; andan anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 175 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 175, and a light chain having an amino acid sequence shown in SEQ ID NO: 177 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 177.In another aspect, provided is an antibody specifically binding to cadherin-17, preferably human cadherin-17, or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 which are same as the HCDR1, HCDR2, and HCDR3 of a heavy chain variable region having an amino acid sequence selected from a group consisting of SEQ ID NO: 1, 3, 5, 19, 21, 23, 25, 27, 37, 39, 41, 170, and 174, and / or a light chain variable region comprising LCDR1, LCDR2, and LCDR3 which are same as the LCDR1, LCDR2, and LCDR3 of a light chain variable region having an amino acid sequence selected from a group consisting of SEQ ID NO: 2, 4, 6, 29, 31, 33, 35, 43, 45, 47, 172, and 176.In some embodiments, the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 are defined according to any one of CDR definition schemes selected from a group consisting of IMGT, Kabat, Contact, Chothia, Martin, PyIgClassify, and any combination thereof. Preferably, the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 are defined according to any one of CDR definition schemes selected from a group consisting of IMGT, Kabat, Contact, Chothia, and any combination thereof.In some embodiments, provided is an antibody specifically binding to cadherin-17, preferably human cadherin-17, or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 having amino acid sequences selected from a group consisting of:SEQ ID NO: 49, 50, and 51, respectively;SEQ ID NO: 68, 69, and 70, respectively;SEQ ID NO: 87, 88, and 89, respectively;SEQ ID NO: 109, 50, and 51, respectively;SEQ ID NO: 49, 50, and 113, respectively;SEQ ID NO: 49, 50, and 116, respectively;SEQ ID NO: 178, 179, and 180, respectively; andSEQ ID NO: 191, 192, and 193, respectively;according to IMGT definition scheme; or a group consisting of:SEQ ID NO: 55, 56, and 57, respectively;SEQ ID NO: 74, 75, and 76, respectively;SEQ ID NO: 93, 94, and 95, respectively;SEQ ID NO: 55, 106, and 57, respectively;SEQ ID NO: 110, 111, and 57, respectively;SEQ ID NO: 55, 106, and 114, respectively;SEQ ID NO: 55, 106, and 117, respectively;SEQ ID NO: 182, 183, and 184, respectively; andSEQ ID NO: 197, 198, and 199, respectively;according to Kabat definition scheme; or a group consisting of:SEQ ID NO: 60, 61, and 57, respectively;SEQ ID NO: 79, 80, and 76, respectively;SEQ ID NO: 98, 99, and 95, respectively;SEQ ID NO: 60, 61, and 114, respectively;SEQ ID NO: 60, 61, and 117, respectively;SEQ ID NO: 185, 186, and 184, respectively; andSEQ ID NO: 202, 203, and 199, respectively;according to Chothia definition scheme; or a group consisting of:SEQ ID NO: 62, 63, and 64, respectively;SEQ ID NO: 81, 82, and 83, respectively;SEQ ID NO: 100, 101, and 102, respectively;SEQ ID NO: 62, 107, and 64, respectively;SEQ ID NO: 62, 108, and 57, respectively;SEQ ID NO: 112, 108, and 64, respectively;SEQ ID NO: 62, 107, and 115, respectively;SEQ ID NO: 62, 107, and 118, respectively;SEQ ID NO: 81, 123, and 83, respectively;SEQ ID NO: 187, 188, and 189, respectively; andSEQ ID NO: 204, 205, and 206, respectively;according to Contact definition scheme;and / or a light chain variable region comprising LCDR1, LCDR2, and LCDR3 having amino acid sequences selected from a group consisting of:SEQ ID NO: 52, 53, and 54, respectively;SEQ ID NO: 71, 72, and 73, respectively;SEQ ID NO: 90, 91, and 92, respectively;SEQ ID NO: 52, 53, and 181, respectively; andSEQ ID NO: 194, 195, and 196, respectively;according to IMGT definition scheme; or a group consisting of:SEQ ID NO: 58, 59, and 54, respectively;SEQ ID NO: 77, 78, and 73, respectively;SEQ ID NO: 96, 97, and 92, respectively;SEQ ID NO: 58, 120, and 54, respectively;SEQ ID NO: 58, 59, and 181, respectively; andSEQ ID NO: 200, 201, and 196, respectively;according to Kabat definition scheme; or a group consisting of:SEQ ID NO: 65, 66, and 67, respectively;SEQ ID NO: 84, 85, and 86, respectively;SEQ ID NO: 103, 104, and 105, respectively;SEQ ID NO: 65, 119, and 67, respectively;SEQ ID NO: 65, 121, and 67, respectively;SEQ ID NO: 65, 122, and 67, respectively;SEQ ID NO: 65, 66, and 190, respectively; andSEQ ID NO: 207, 208, and 209, respectively;according to Contact definition scheme.In some embodiments, provided is an antibody specifically binding to cadherin-17, preferably human cadherin-17, or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 and a light chain variable region comprising LCDR1, LCDR2, and LCDR3, wherein the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 have amino acid sequences selected from a group consisting of:SEQ ID NO: 49, 50, 51, 52, 53, and 54, respectively;SEQ ID NO: 68, 69, 70, 71, 72, and 73, respectively;SEQ ID NO: 87, 88, 89, 90, 91, and 92, respectively;SEQ ID NO: 109, 50, 51, 52, 53, and 54, respectively;SEQ ID NO: 49, 50, 113, 52, 53, and 54, respectively;SEQ ID NO: 49, 50, 116, 52, 53, and 54, respectively;SEQ ID NO: 178, 179, 180, 52, 53, and 181, respectively; andSEQ ID NO: 191, 192, 193, 194, 195, and 196, respectively;according to IMGT definition scheme; or a group consisting of:SEQ ID NO: 55, 56, 57, 58, 59, and 54, respectively;SEQ ID NO: 74, 75, 76, 77, 78, and 73, respectively;SEQ ID NO: 93, 94, 95, 96, 97, and 92, respectively;SEQ ID NO: 55, 106, 57, 58, 59, and 54, respectively;SEQ ID NO: 110, 111, 57, 58, 120, and 54, respectively;SEQ ID NO: 55, 106, 57, 58, 120, and 54, respectively;SEQ ID NO: 55, 106, 114, 58, 120, and 54, respectively;SEQ ID NO: 55, 106, 117, 58, 120, and 54, respectively;SEQ ID NO: 182, 183, 184, 58, 59, and 181, respectively; andSEQ ID NO: 197, 198, 199, 200, 201, and 196, respectively;according to Kabat definition scheme; or a group consisting of:SEQ ID NO: 60, 61, 57, 58, 59, and 54, respectively;SEQ ID NO: 79, 80, 76, 77, 78, and 73, respectively;SEQ ID NO: 98, 99, 95, 96, 97, and 92, respectively;SEQ ID NO: 60, 61, 57, 58, 120, and 54, respectively;SEQ ID NO: 60, 61, 114, 58, 120, and 54, respectively;SEQ ID NO: 60, 61, 117, 58, 120, and 54, respectively;SEQ ID NO: 185, 186, 184, 58, 59, and 181, respectively; andSEQ ID NO: 202, 203, 199, 200, 201, and 196, respectively;according to Chothia definition scheme; or a group consisting of:SEQ ID NO: 62, 63, 64, 65, 66, and 67, respectively;SEQ ID NO: 81, 82, 83, 84, 85, and 86, respectively;SEQ ID NO: 100, 101, 102, 103, 104, and 105, respectively;SEQ ID NO: 62, 107, 64, 65, 119, and 67, respectively;SEQ ID NO: 62, 108, 57, 65, 66, and 67, respectively;SEQ ID NO: 112, 108, 64, 65, 121, and 67, respectively;SEQ ID NO: 62, 107, 115, 65, 122, and 67, respectively;SEQ ID NO: 62, 107, 118, 65, 122, and 67, respectively;SEQ ID NO: 62, 107, 64, 65, 122, and 67, respectively;SEQ ID NO: 81, 123, 83, 84, 85, and 86, respectively;SEQ ID NO: 187, 188, 189, 65, 66, and 190, respectively; andSEQ ID NO: 204, 205, 206, 207, 208, and 209, respectively;according to Contact definition scheme.In some embodiments, provided is an antibody specifically binding to cadherin-17, preferably human cadherin-17, or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region having an amino acid sequence selected from a group consisting of SEQ ID NO: 1, 3, 5, 19, 21, 23, 25, 27, 37, 39, 41, 170, 174, and an amino acid sequence having at least 80%sequence identity to each thereof, and / or a light chain variable region having an amino acid sequence selected from a group consisting of SEQ ID NO: 2, 4, 6, 29, 31, 33, 35, 43, 45, 47, 172, 176, and an amino acid sequence having at least 80%sequence identity to each thereof.In some embodiments, provided is an antibody specifically binding to cadherin-17, preferably human cadherin-17, or an antigen binding fragment thereof, wherein the antibody is selected from a group consisting of:an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 1 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 1, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 2 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 2;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 3 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 3, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 4 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 4;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 5 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 5, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 6 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 6;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 19 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 19, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 29 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 29;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 21 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 21, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 31 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 31;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 23 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 23, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 33 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 33;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 19 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 19, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 35 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 35;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 25 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 25, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 35 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 35;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 27 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 27, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 35 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 35;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 37 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 37, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 43 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 43;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 39 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 39, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 45 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 45;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 41 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 41, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 47 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 47;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 170 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 170, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 172 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 172; andan anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 174 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 174, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 176 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 176.In some embodiments, the anti-CDH17 antibody comprises a heavy chain having an amino acid sequence selected from a group consisting of SEQ ID NO: 7, 9, 11 , 20, 22, 24, 26, 28, 38, 40, 42, 171, 175, and an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to each thereof; and / or a light chain having an amino acid sequence selected from a group consisting of SEQ ID NO: 8, 10, 12, 30, 32, 34, 36, 44, 46, 48, 173, 177, and an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to each thereof.In some embodiments, the anti-CDH17 antibody is selected from a group consisting of:an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 7 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 7, and a light chain having an amino acid sequence shown in SEQ ID NO: 8 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 8;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 9 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 9, and a light chain having an amino acid sequence shown in SEQ ID NO: 10 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 10;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 11 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 11, and a light chain having an amino acid sequence shown in SEQ ID NO: 12 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 12;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 20 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 20, and a light chain having an amino acid sequence shown in SEQ ID NO: 30 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 30;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 22 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 22, and a light chain having an amino acid sequence shown in SEQ ID NO: 32 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 32;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 24 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 24, and a light chain having an amino acid sequence shown in SEQ ID NO: 34 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 34;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 20 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 20, and a light chain having an amino acid sequence shown in SEQ ID NO: 36 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 36;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 26 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 26, and a light chain having an amino acid sequence shown in SEQ ID NO: 36 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 36;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 28 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 28, and a light chain having an amino acid sequence shown in SEQ ID NO: 36 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 36;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 38 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 38, and a light chain having an amino acid sequence shown in SEQ ID NO: 44 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 44;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 40 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 40, and a light chain having an amino acid sequence shown in SEQ ID NO: 46 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 46;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 42 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 42, and a light chain having an amino acid sequence shown in SEQ ID NO: 48 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 48;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 171 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 171, and a light chain having an amino acid sequence shown in SEQ ID NO: 173 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 173; andan anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 175 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 175, and a light chain having an amino acid sequence shown in SEQ ID NO: 177 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 177.In any of the embodiments disclosed herein, the antibody may be a mono-specific antibody, a multi-specific antibody, an intact antibody, a human antibody, a humanized antibody or a chimeric antibody.In any of the embodiments disclosed herein, the antigen binding fragment is selected from a group consisting of Fab, Fab’, Fv, F (ab’) 2, scFv, di-scFv and dAb.In another aspect, provided is an immunoconjugate, a pharmaceutically acceptable salt thereof, or a solvate thereof, comprising an antibody or an antigen binding fragment thereof according to any of the embodiments disclosed herein, linked to an active agent.In another aspect, provided is an antibody-drug conjugate having a formula of Ab- (L- (D) m) n, wherein Ab is the antibody or an antigen binding fragment thereof according to any of the embodiments disclosed herein; L is a linker; D is a drug moiety; m is an integer from 1 to 8; and n is any number from 1 to 10.In another aspect, provided is a nucleic acid molecule encoding the antibody or an antigen binding fragment thereof according to any of the embodiments disclosed herein.In another aspect, provided is an expression vector containing the nucleic acid molecule disclosed herein.In another aspect, provided is a non-human host cell containing the expression vector disclosed herein.In another aspect, provided is a pharmaceutical composition comprising the antibody or an antigen binding fragment thereof according to any of the embodiments disclosed herein, or the immunoconjugate, a pharmaceutically acceptable salt thereof, or a solvate thereof, according to any of the embodiments disclosed herein; and a pharmaceutically acceptable carrier.In another aspect, provided is use of the antibody or an antigen binding fragment thereof according to any of the embodiments disclosed herein, or the immunoconjugate, a pharmaceutically acceptable salt thereof, or a solvate thereof, according to any of the embodiments disclosed herein in the preparation of a medicament for the treatment of cancer.In another aspect, provided is a method for treating a cancer in a subject comprising administering to the subject a therapeutically acceptable amount of the antibody or an antigen binding fragment thereof according to any of the embodiments disclosed herein, or the immunoconjugate, a pharmaceutically acceptable salt thereof, or a solvate thereof, according to any of the embodiments disclosed herein, or the pharmaceutical composition according to any of the embodiments disclosed herein.Other aspects of the disclosure will be apparent from the detailed description follows.Brief Description of the DrawingsFIG. 1A shows flow cytometry result of examining the binding of anti-CDH17 antibody CL075814 and CL075835 to human colorectal cancer cell line COLO 205. FIG. 1B shows flow cytometry result of examining the binding of anti-CDH17 antibody CL075814 and CL075942 to human colorectal cancer cell line COLO 205.FIG. 2 shows immunofluorescence results of examining the binding specificity of an anti-CDH17 antibody CL075814 to human CDH17 overexpressed on 293T cell.FIG. 3 shows immunofluorescence results of examining the binding specificity of an anti-CDH17 antibody CL075835 to human CDH17 overexpressed on 293T cell.FIG. 4 shows flow cytometry result of examining the binding affinity (EC50) of anti-CDH17 chimeric antibodies Ch814, Ch835 and Ch942 to human pancreatic cancer cell line AsPC-1.FIG. 5A shows flow cytometry result of examining the binding affinity (EC50) of anti-CDH17 chimeric antibodies Ch814 and its humanized variants Hu814-H1L1, Hu814-H2L2, and Hu814-H3L3 to human colorectal cancer cell line COLO 205. FIG. 5B shows flow cytometry result of examining the binding affinity (EC50) of anti-CDH17 chimeric antibody Ch814 and its humanized variants Hu814-H1L4, Hu814-H4L4, and Hu814-H5L4 to human gastric cancer cell line SNU-16.FIG. 6 shows flow cytometry result of examining the binding affinity (EC50) of anti-CDH17 chimeric antibody Ch835 and its humanized variants Hu835-H1L1, Hu835-H2L2, and Hu835-H3L3 to human gastric cancer cell line AGS.FIG. 7A shows flow cytometry result of examining the binding affinity (EC50) of humanized anti-CDH17 antibody Hu814-H1L4 to human and cyno monkey CDH17 expressed on 293F cell. FIG. 7B shows flow cytometry result of examining the binding affinity (EC50) of humanized anti-CDH17 antibody Hu814-H5L4 to human and cyno monkey CDH17 expressed on 293F cell.FIG. 8A shows flow cytometry result of examining the binding affinity (EC50) of humanized anti-CDH17 antibody Hu814-H1L4, which has been incubated at 40℃ for 0, 14 and 28 days, to human gastric cancer cell line SNU-16. FIG. 8B shows flow cytometry result of examining the binding affinity (EC50) of humanized anti-CDH17 antibody Hu814-H5L4, which has been incubated at 40℃ for 0, 14 and 28 days, to human gastric cancer cell line SNU-16.FIG. 9A shows flow cytometry result of examining the binding domain of humanized anti-CDH17 antibody Hu814-H1L4 to domain-swapped CDH17 variants expressed in 293F cells. FIG. 9B shows flow cytometry result of examining the binding domain of humanized anti-CDH17 antibody Hu835-H1L1 to domain-swapped CDH17 variants expressed in 293F cells. FIG. 9C shows flow cytometry result of examining the binding domain of chimeric anti-CDH17 antibody Ch942 to domain-swapped CDH17 variants expressed in 293F cells. FIG. 9D shows flow cytometry result of examining the binding domain of chimeric anti-CDH17 antibody Ch2F12 to domain-swapped CDH17 variants expressed in 293F cells. FIG. 9E shows flow cytometry result of examining the binding domain of chimeric anti-CDH17 antibody Ch2E21 to domain-swapped CDH17 variants expressed in 293F cells. FIG. 9F shows flow cytometry result of examining the binding domain of chimeric anti-CDH17 antibody RAb17 to domain-swapped CDH17 variants expressed in 293F cells.FIG. 10A shows the SEC chromatogram of quality control (Hu814-H1L4) ; FIG. 10B shows the HIC chromatogram of quality control (Hu814-H1L4) .FIG. 11A shows the SEC result of antibody-drug conjugate Ch814-vc-MMAE; FIG. 11B shows the HIC result of antibody-drug conjugate Ch814-vc-MMAE, wherein Ab is Ch814, linker-payload is vc-MMAE.FIG. 12A shows the SEC result of antibody-drug conjugate Ch835-vc-MMAE; FIG. 12B shows the HIC result of antibody-drug conjugate Ch835-vc-MMAE, wherein Ab is Ch835, linker-payload is vc-MMAE.FIG. 13 shows the HIC result of antibody-drug conjugate Ch942-vc-MMAE, wherein Ab is Ch942, linker-payload is vc-MMAE.FIG. 14A shows the SEC result of antibody-drug conjugate Hu814-H1L4-vc-MMAE; FIG. 14B shows the HIC result of antibody-drug conjugate Hu814-H1L4-vc-MMAE, wherein Ab is Hu814-H1L4, linker-payload is vc-MMAE.FIG. 15A shows the SEC result of antibody-drug conjugate Hu814-H1L4-LP1 (DAR8) ; FIG. 15B shows the HIC result of antibody-drug conjugate Hu814-H1L4-LP1 (DAR8) , wherein Ab is Hu814-H1L4, linker-payload is LP1.FIG. 16A shows the SEC result of antibody-drug conjugate Hu814-H1L4-LP1 (DAR4) ; FIG. 16B shows the HIC result of antibody-drug conjugate Hu814-H1L4-LP1 (DAR4) , wherein Ab is Hu814-H1L4, linker-payload is LP1.FIG. 17A shows the SEC result of antibody-drug conjugate Patritumab-GGFG-DXd; FIG. 17B shows the HIC result of antibody-drug conjugate Patritumab-GGFG-DXd, wherein Ab is Patritumab, linker-payload is GGFG-DXd.FIG. 18A shows the SEC result of antibody-drug conjugate Trastuzumab-GGFG-DXd; FIG. 18B shows the HIC result of antibody-drug conjugate Trastuzumab-GGFG-DXd, wherein Ab is Trastuzumab, linker-payload is GGFG-DXd.FIG. 19A shows the SEC result of antibody-drug conjugate Datopotamab-GGFG-DXd; FIG. 19B shows the HIC result of antibody-drug conjugate Datopotamab-GGFG-DXd, wherein Ab is Datopotamab, linker-payload is GGFG-DXd.FIG. 20A shows the SEC result of antibody-drug conjugate Human IgG-vc-MMAE; FIG. 20B shows the HIC result of antibody-drug conjugate Human IgG-vc-MMAE, wherein Ab is Human IgG, linker-payload is vc-MMAE.FIG. 21A shows the SEC result of antibody-drug conjugate Human IgG-LP1 (DAR8) ; FIG. 21B shows the HIC result of antibody-drug conjugate Human IgG-LP1 (DAR8) , wherein Ab is Human IgG, linker-payload is LP1.FIG. 22A shows the SEC result of antibody-drug conjugate Human IgG-LP1 (DAR4) ; FIG. 22B shows the HIC result of antibody-drug conjugate Human IgG-LP1 (DAR4) , wherein Ab is Human IgG, linker-payload is LP1.FIG. 23A shows the SEC result of antibody-drug conjugate Human IgG-GGFG-DXd; FIG. 23B shows the HIC result of antibody-drug conjugate Human IgG-GGFG-DXd, wherein Ab is Human IgG, linker-payload is GGFG-DXd.FIG. 24 shows the results of evaluating the in vitro cell growth inhibition activity of anti-CDH17 chimeric antibody-drug conjugates Ch814-vc-MMAE, Ch835-vc-MMAE and Ch942-vc-MMAE to human gastric cancer cell line SNU-16.FIG. 25A shows concentration-dependent cell growth inhibition activities of Ch814-LP1 (DAR8) , Ch942-LP1 (DAR8) , Ch2E21-LP1 (DAR8) , Ch2F12-LP1 (DAR8) , and RAb17-LP1 (DAR8) in CDH17-positive AsPC-1 pancreatic cancer cell line. FIG. 25B shows concentration-dependent cell growth inhibition activities of Ch814-LP1 (DAR8) , Ch942-LP1 (DAR8) , Ch2E21-LP1 (DAR8) , Ch2F12-LP1 (DAR8) , and RAb17-LP1 (DAR8) in CDH17-positive SNU5 gastric cancer cell line. FIG. 25C shows concentration-dependent cell growth inhibition activities of Ch814-LP1 (DAR8) , Ch942-LP1 (DAR8) , Ch2E21-LP1 (DAR8) , Ch2F12-LP1 (DAR8) , and RAb17-LP1 (DAR8) in CDH17-positive SNU16 gastric cancer cell line.. FIG. 25D shows the internalization of Hu814-H1L4-LP1 (DAR8) and Hu814-H1L4-vc-MMAE by SNU-16 cells. FIG. 25E shows the internalization of Hu814-H1L4-LP1 (DAR8) and Hu814-H1L4-vc-MMAE by SNU-5 cells.FIG. 26A shows the results of evaluating the in vitro cell growth inhibition activity of anti-CDH17 antibody-drug conjugate Hu814-H1L4-vc-MMAE to human gastric cancer cell line SNU-16. FIG. 26B shows the results of evaluating the in vitro cell growth inhibition activity of anti-CDH17 antibody-drug conjugates Hu814-H1L4-LP1 (DAR8) and Hu814-H5L4-LP1 (DAR4) to human gastric cancer cell line SNU-16.FIG. 27A shows the in vivo antitumor effects of two humanized anti-CDH17 antibody-drug conjugates (Hu814-H1L4-vc-MMAE, Hu814-H1L4-LP1 (DAR8) ) . The evaluation was conducted using animal model in which CDH17-positive human gastric cancer cell line SNU-5 was inoculated into immunodeficient mice. FIG. 27B shows the effect on body weight of mice of two humanized anti-CDH17 antibody-drug conjugates (Hu814-H1L4-vc-MMAE, Hu814-H1L4-LP1 (DAR8) ) . The evaluation was conducted using animal model in which CDH17-positive human gastric cancer cell line SNU-5 was inoculated into immunodeficient mice.FIG. 28A shows the in vivo antitumor effects of three antibody-drug conjugates (Patritumab-GGFG-DXd, Transtuzumab-GGFG-DXd, Datopotamab-GGFG-DXd, Hu814-H1L4-LP1 (DAR8) ) . The evaluation was conducted using animal model in which the HER3, HER2, Trop2 and CDH17-positive human gastric cancer patient derived xenograft tumor was inoculated into immunodeficient mice. FIG. 28B shows the effect on body weight of mice of three antibody-drug conjugates (Patritumab-GGFG-DXd, Transtuzumab-GGFG-DXd, Datopotamab-GGFG-DXd Hu814-H1L4-LP1 (DAR8) ) . The evaluation was conducted using animal model in which HER3, HER2, Trop2 and CDH17-positive human gastric cancer patient derived xenograft tumor was inoculated into immunodeficient mice.FIG. 29A shows the in vivo antitumor effects of two humanized anti-CDH17 antibody-drug conjugates (Hu814-H1L4-LP1 (DAR8) , Hu814-H5L4-LP1 (DAR4) ) . The evaluation was conducted using animal model in which CDH17-positive human pancreatic cancer cell line AsPC-1 was inoculated into immunodeficient mice. FIG. 29B shows the effect on body weight of mice of two humanized anti-CDH17 antibody-drug conjugates (Hu814-H1L4-LP1 (DAR8) , Hu814-H5L4-LP1 (DAR4) ) . The evaluation was conducted using animal model in which CDH17-positive human pancreatic cancer cell line AsPC-1 was inoculated into immunodeficient mice.FIG. 30A shows the in vivo antitumor effects of two humanized anti-CDH17 antibody-drug conjugates (Hu814-H1L4-LP1 (DAR8) , Hu814-H5L4-LP1 (DAR4) ) . The evaluation was conducted using animal model in which CDH17-positive human colorectal cancer patient derived xenograft tumor was inoculated into immunodeficient mice. FIG. 30B shows the effect on body weight of mice of two humanized anti-CDH17 antibody-drug conjugates (Hu814-H1L4-LP1 (DAR8) , Hu814-H5L4-LP1 (DAR4) ) and two isotype control (IgG-LP1 (DAR8) , IgG-LP1 (DAR4) ) . The evaluation was conducted using animal model in which CDH17-positive human colorectal cancer patient derived xenograft tumor was inoculated into immunodeficient mice.FIG. 31A shows the in vivo antitumor effects of two antibody-drug conjugates (Patritumab-GGFG-DXd, Hu814-H1L4-LP1 (DAR8) ) . The evaluation was conducted using animal model in which HER3 and CDH17-positive human colorectal cancer patient derived xenograft tumor was inoculated into immunodeficient mice. FIG. 31B shows the effect on body weight of mice of two antibody-drug conjugates (Patritumab-GGFG-DXd, Hu814-H1L4-LP1 (DAR8) ) . The evaluation was conducted using animal model in which HER3 and CDH17-positive human colorectal cancer patient derived xenograft tumor was inoculated into immunodeficient mice.FIG. 32A shows the in vivo antitumor effects of two humanized antibody-drug conjugates (Hu814-H1L4-LP1 (DAR8) , Hu814-H5L4-LP1 (DAR4) ) . The evaluation was conducted using animal model in which CDH17-positive human cholangiocarcinoma cancer patient derived xenograft tumor was inoculated into immunodeficient mice. FIG. 32B shows the effect on body weight of mice of two humanized antibody-drug conjugates (Hu814-H1L4-LP1 (DAR8) , Hu814-H5L4-LP1 (DAR4) ) . The evaluation was conducted using animal model in which CDH17-positive human cholangiocarcinoma cancer patient derived xenograft tumor was inoculated into immunodeficient mice.FIG. 33A shows the in vivo antitumor effects of two humanized antibody-drug conjugates (Hu814-H1L4-LP1 (DAR8) , Hu814-H5L4-LP1 (DAR4) ) . The evaluation was conducted using animal model in which CDH17-positive human liver cancer patient derived xenograft tumor was inoculated into immunodeficient mice. FIG. 33B shows the effect on body weight of mice of two humanized antibody-drug conjugates (Hu814-H1L4-LP1 (DAR8) , Hu814-H5L4-LP1 (DAR4) ) . The evaluation was conducted using animal model in which CDH17-positive human liver cancer patient derived xenograft tumor was inoculated into immunodeficient mice.FIG. 34 shows the detection of CDH17 expression in gastric cancer (A) , colorectal cancer (B) , pancreatic cancer (C) , esophageal adenocarcinoma (D) , cholangiocarcinoma (E) and neuroendocrine cancer (F) by immunohistochemistry using CL075814 as primary antibody.FIG. 35A shows that Ch814 and Ch2F12 compete with Ch814-Biotin. FIG. 35B shows that Ch2F12 and Ch814 compete with Ch2F12-Biotin. FIG. 35C shows that Ch835 and Ch942 compete with Ch835-Biotin. FIG. 35D shows that Ch942, as a positive control, competes with Ch942-Biotin, while Ch835 has lower but still detectable competition activity against Ch942-Biotin.FIG. 36 shows the structure of the Hu814-H5L4-LP1.Detailed DescriptionDefinitionUnless stated otherwise, the following terms and phrases as used herein are intended to have the following meanings:As used herein, the term "antibody" generally refers to a polypeptide of the immunoglobulin family that is capable of binding a corresponding antigen non-covalently, reversibly, and in a specific manner. For example, a naturally occurring IgG antibody is a tetramer comprising at least two heavy (H) chains and two light (L) chains inter-connected by disulfide bonds. Each heavy chain (HC) is comprised of a heavy chain variable region (abbreviated herein as VH) and a heavy chain constant region. The heavy chain constant region is comprised of three domains, CH1, CH2 and CH3. Each light chain (LC) is comprised of a light chain variable region (abbreviated herein as VL) and a light chain constant region. The light chain constant region is comprised of one domain, CL. The VH and VL regions can be further subdivided into regions of hypervariability, termed complementarity determining regions (CDR) , interspersed with regions that are more conserved, termed framework regions (FR) . Each VH and VL is composed of three CDRs and four FRs arranged from amino-terminus to carboxy-terminus in the following order: FR1, CDR1, FR2, CDR2, FR3, CDR3, and FR4. The variable regions of the heavy and light chains contain a binding domain that interacts with an antigen. The constant regions of the antibodies may mediate the binding of the immunoglobulin to host tissues or factors, including various cells of the immune system (e.g., effector cells) and the first component (Clq) of the classical complement system.The term "antibody" includes, but is not limited to, monoclonal antibodies, human antibodies, humanized antibodies, camelid antibodies, and chimeric antibodies. The antibodies can be of any isotype / class (e.g., IgG, IgE, IgM, IgD, IgA and IgY) or subclass (e.g., IgG1, IgG2, IgG3, IgG4, IgA1 and IgA2) .As used herein, the term "Complementarity determining domains" is used herein interchangeably with the term "complementary determining regions" ( "CDRs" ) , and generally refers to the hypervariable regions of VL and VH. The CDRs are the target protein-binding site of the antibody chains that harbors specificity for such target protein. There are three CDRs (CDR1-3, numbered sequentially from the N-terminus) in each human VL or VH, constituting about 15-20%of the variable domains. CDRs can be referred to by their region and order. For example, "VH CDR1" or "HCDR1" both refer to the first CDR of the heavy chain variable region. The CDRs are structurally complementary to the epitope of the target protein and are thus directly responsible for the binding specificity. The remaining stretches of the VL or VH, the so-called framework regions, exhibit less variation in amino acid sequence (Kuby, Immunology, 4th ed., Chapter 4. W. H. Freeman &Co., New York, 2000) . In the art, the CDR of the antibody can be defined by various methods / schemes, such as a Kabat definition scheme based on sequence variability (see Kabat et al., protein sequence in immunology, 5th edition, National Institutes of Health, Bethesda, Maryland (1991) ) , a Chothia definition scheme based on the position of a structural loop region (see A1-Lazikani et al., JMol Biol 273: 927-48, 1997) and a IMGT definition scheme based on the concept of IMGT-ONTOLOGY and IMGT Scientific chart rules. In certain embodiments, the present application uses the IMGT rules to define the CDRs of an antibody. The definition rules of Martin, PyIgClassify and Combined definition rules of Kabat, Chothia, IMGT, Martin and PyIgClassify are also included in this application (see Mark L. Chiu et al., Antibodies 8 (4) , 55, 2019) .Table A. Comparation of CDR numbering among different definition schemes (in Chothia numbering)wherein, Laa-Lbb or Haa-Hbb may refer to, from N-terminal, the amino acids sequence from NO. aa to NO. bb of light chain or heavy chain respectively. For example, L24-L34 refers to the amino acid sequence from NO. 24 to NO. 34 of light chain.Both the light and heavy chains are divided into regions of structural and functional homology. The terms "constant" and "variable" are used functionally. In this regard, it will be appreciated that the variable domains of both the light (VL) and heavy (VH) chain portions determine antigen recognition and specificity. Conversely, the constant domains of the light chain (CL) and the heavy chain (CH1, CH2 or CH3) confer important biological properties such as secretion, transplacental mobility, Fc receptor binding, complement binding, and the like. By convention, the numbering of the constant region domains increases as they become more distal from the antigen binding site or amino-terminus of the antibody. The N-terminus is a variable region and at the C-terminus is a constant region; the CH3 and CL domains actually comprise the carboxy-terminal domains of the heavy and light chain, respectively.As used herein, the term "antigen binding fragment" generally refers to a polypeptide including one or more portions of an antibody that retain the ability to specifically interact with (e.g., by binding, steric hindrance, stabilizing / destabilizing, spatial distribution) an epitope of an antigen. Examples of binding fragments include, but are not limited to, single-chain Fvs (scFv) , disulfide-linked Fvs (sdFv) , Fab fragments, F (ab') fragments, a monovalent fragment consisting of the VL, VH, CL and CH1 domains; a F (ab') 2 fragment, a bivalent fragment comprising two Fab fragments linked by a disulfide bridge at the hinge region; a Fd fragment consisting of the VH and CH1 domains; a Fv fragment consisting of the VL and VH domains of a single arm of an antibody; a dAb fragment (Ward et al., Nature 341: 544-546, 1989) , which consists of a VH domain; and an isolated complementarity determining region (CDR) or other epitope-binding fragments of an antibody.Antigen binding fragments also comprises single domain antibodies, maxibodies, minibodies, nanobodies, intrabodies, diabodies, triabodies, tetrabodies and bis-scFv (see, e.g., Hollinger and Hudson, Nature Biotechnology 23: 1126-1136, 2005) . Antigen binding fragments can also comprise single chain molecules comprising a pair of tandem Fv segments (VH-CH1-VH-CH1) which, together with complementary light chain polypeptides, form a pair of antigen binding regions (Zapata et al, Protein Eng. 8: 1057-1062, 1995) . A fragment of a conventional antibody may also be a single domain antibody, such as a heavy chain antibody or VHH.As used herein, the term "monoclonal antibody" as used herein generally refers to polypeptides, including antibodies and antigen binding fragments that have substantially identical amino acid sequence or are derived from the same genetic source. This term also includes preparations of antibody molecules of single molecular composition. A monoclonal antibody composition displays a single binding specificity and affinity for a particular epitope.As used herein, the term "humanized antibody” generally refers to an antibody which includes sequences of heavy chain variable regions and light chain variable regions derived from non-human species (e.g., mice) , but in which at least a portion of the VH and / or VL sequences have been changed to be similar to the human germline variable sequences. For example, the term "humanized antibody" is an antibody or a variant, derivative, analogue or fragment thereof that can bind to a related antigen with immune specificity and includes a framework region (FR) which includes substantially an amino acid sequence of a human antibody and a complementary determining region (CDR) which includes substantially an amino acid sequence of a non-human antibody. In the context of CDR, the term “substantially” means that the amino acid sequence of CDR has at least 80%, e.g., at least 85%, at least 90%, at least 95%, at least 98%or at least 99%identity with an amino acid sequence of CDR of a non-human antibody. The humanized antibodies include substantially at least one, typically two variable domains (Fab, Fab’, F (ab’) 2, Fab, Fv) , wherein all or substantially all CDR regions correspond to the CDR region of a non-human immunoglobulin and all or substantially all framework regions are frame regions with consensus sequence of human immunoglobulin. In some embodiments, the humanized antibody can further include at least a portion of a constant region of immunoglobulin (Fc) , typically a constant region of human immunoglobulin.As used herein, the term "human antibody" generally refers to an antibody with variable and constant regions derived from the sequence of immunoglobulin of human germ line. Human antibodies are well known in the prior art (e.g., van Dijk, M. A. and van de Winkel, J.G., Curr. Opin. Chem. Biol. 5 (2001) 368-374) . The human antibodies can also be generated in transgenic animals (e.g., mice) which can generate a complete or selected set of human antibodies in absence of generated endogenous immunoglobulin after immunization (e.g., Jakobovits, A. et al., Proc. Natl. Acad. Sci. USA 90 (1993) 2551-2555; Jakobovits, A. et al., Nature 362 (1993) 255-258; Brueggemann, M. et al., YearImmunol. 7 (1993) 33-40) . The human antibodies can also be generated in a phage display library (e.g., Hoogenboom, H. R. and Winter, G., J. Mol. Biol. 227 (1992) 381-388; Marks, J.D. et al., J. Mol. Biol. 222 (1991) 581-597) . The term “human antibody” can also include antibodies modified in the constant regions.As used herein, the term "chimeric antibody" generally refers to an engineered antibody which in its broadest sense contains one or more regions from one antibody and one or more regions from one or more other antibody (ies) . In particular a chimeric antibody comprises a VH domain and a VL domain of an antibody derived from a non-human animal, in association with a CH domain and a CL domain of another antibody, in particular a human antibody. As the non-human animal, any animal such as mouse, rat, hamster, rabbit or the like can be used. A chimeric antibody may also denote a multispecific antibody having specificity for at least two different antigens.By "purified" and "isolated" it is meant, when referring to a polypeptide (i.e. the antibody of the invention) or a nucleotide sequence, that the indicated molecule is present in the substantial absence of other biological macromolecules of the same type. The term "purified" as used herein in particular means at least 75%, 85%, 95%or 98%by weight, of biological macromolecules of the same type are present. An "isolated" nucleic acid molecule that encodes a particular polypeptide refers to a nucleic acid molecule that is substantially free of other nucleic acid molecules that do not encode the subject polypeptide; however, the molecule may include some additional bases or moieties, which do not deleteriously affect the basic characteristics of the composition. The present invention may contain, for example, an isolated antigen-binding protein, an isolated antibody or an antigen-binding fragment thereof, an isolated polypeptide, an isolated nucleic acid molecule or molecules.As used herein, the term "affinity" is generally defined by the equilibrium association between the whole antibody and the antigen. Affinity may be expressed for example in half-maximal effective concentration (EC50) or the equilibrium dissociation constant (KD) . Affinity can be experimentally assessed by a variety of known methods, such as measuring association and dissociation rates with surface Plasmon resonance or measuring the EC50 in an immunochemical assay (ELISA, FACS) .The term "conservatively modified variant" applies to both amino acid and nucleic acid sequences. With respect to particular nucleic acid sequences, conservatively modified variant refers to those nucleic acids which encode identical or essentially identical amino acid sequences or where the nucleic acid does not encode an amino acid sequence, to essentially identical sequences. Because of the degeneracy of the genetic code, a large number of functionally identical nucleic acids encode any given protein. For instance, the codons GCA, GCC, GCG and GCU all encode the amino acid alanine. Thus, at every position where an alanine is specified by a codon, the codon can be altered to any of the corresponding codons described without altering the encoded polypeptide. Such nucleic acid variations are "silent variations, " which are one species of conservatively modified variations. Every nucleic acid sequence herein which encodes a polypeptide also describes every possible silent variation of the nucleic acid. One of skill will recognize that each codon in a nucleic acid (except AUG, which is ordinarily the only codon for methionine, and TGG, which is ordinarily the only codon for tryptophan) can be modified to yield a functionally identical molecule. Accordingly, each silent variation of a nucleic acid that encodes a polypeptide is implicit in each described sequence.For polypeptide sequences, "conservatively modified variants" include individual substitutions, deletions or additions to a polypeptide sequence which result in the substitution of an amino acid with a chemically similar amino acid. Conservative substitution tables providing functionally similar amino acids are well known in the art. Such conservatively modified variants are in addition to and do not exclude polymorphic variants, interspecies homologs, and alleles. The following eight groups contain amino acids that are conservative substitutions for one another: 1) Alanine (A) , Glycine (G) ; 2) Aspartic acid (D) , Glutamic acid (E) ; 3) Asparagine (N) , Glutamine (Q) ; 4) Arginine (R) , Lysine (K) ; 5) Isoleucine (I) , Leucine (L) , Methionine (M) , Valine (V) ; 6) Phenylalanine (F) , Tyrosine (Y) , Tryptophan (W) ; 7) Serine (S) , Threonine (T) ; and 8) Cysteine (C) , Methionine (M) (see, e.g., Creighton, Proteins (1984) ) . In some aspects, the term "conservative sequence modifications" are used to refer to amino acid modifications that do not significantly affect or alter the binding characteristics of the antibody containing the amino acid sequence.As used herein, the term "percent identical" or "percent identity, " in the context of two or more nucleic acids or polypeptide sequences, refers to the extent to which two or more sequences or subsequences that are the same. Two sequences are "identical" if they have the same sequence of amino acids or nucleotides over the region being compared. Two sequences are "substantially identical" if two sequences have a specified percentage of amino acid residues or nucleotides that are the same (i.e., 60%identity, optionally 65%, 70%, 75%, 80%, 85%, 90%, 95%or 99%identity over a specified region or, when not specified, over the entire sequence) , when compared and aligned for maximum correspondence over a comparison window or designated region as measured using one of the following sequence comparison algorithms or by manual alignment and visual inspection. Optionally, the identity exists over a region that is at least about 30 nucleotides (or 10 amino acids) in length or more preferably over a region that is 100 to 500 or 1000 or more nucleotides (or 20, 50, 200 or more amino acids) in length. Two examples of algorithms that are suitable for determining percent sequence identity and sequence similarity are the BLAST and BLAST 2.0 algorithms, which are described in Altschul et al, Nuc. Acids Res. 25: 3389-3402, 1977; and Altschul et al , J. Mol. Biol. 215: 403-410, 1990, respectively.Other than percentage of sequence identity noted above, another indication that two nucleic acid sequences or polypeptides are substantially identical is that the polypeptide encoded by the first nucleic acid is immunologically cross reactive with the antibodies raised against the polypeptide encoded by the second nucleic acid. Thus, a polypeptide is typically substantially identical to a second polypeptide, for example, where the two peptides differ only by conservative substitutions. Another indication that two nucleic acid sequences are substantially identical is that the two molecules or their complements hybridize to each other under stringent conditions. Yet another indication that two nucleic acid sequences are substantially identical is that the same primers can be used to amplify the sequence.As used herein, the term "nucleic acid molecule" is used herein interchangeably with the term "polynucleotide" and generally refers to deoxyribonucleotides or ribonucleotides and polymers thereof in either single-or double-stranded form. The term encompasses nucleic acids containing known nucleotide analogs or modified backbone residues or linkages, which are synthetic, naturally occurring, and non-naturally occurring, which have similar binding properties as the reference nucleic acid, and which are metabolized in a manner similar to the reference nucleotides. Examples of such analogs include, without limitation, phosphorothioates, phosphoramidates, methyl phosphonates, chiral-methyl phosphonates, 2-O-methyl ribonucleotides, peptide-nucleic acids (PNAs) .As used herein, the term "polypeptide" is used herein interchangeably with the term "protein" and refers to a polymer of amino acid residues. The terms apply to amino acid polymers in which one or more amino acid residue is an artificial chemical mimetic of a corresponding naturally occurring amino acid, as well as to naturally occurring amino acid polymers and non-naturally occurring amino acid polymer. Unless otherwise indicated, a particular polypeptide sequence also implicitly encompasses conservatively modified variants thereof.As used herein, the term "immunoconjugate" as used herein generally refers to the linkage of an antibody or an antigen binding fragment thereof with another agent, such as a payload, a drug moiety, a chemotherapeutic agent, a toxin, an immunotherapeutic agent, an imaging probe, and the like. The linkage can be a covalent bond or non-covalent interactions such as through electrostatic forces. Various linkers, known in the art, can be employed in order to form the immunoconjugate. Additionally, the immunoconjugate can be provided in the form of a fusion protein that may be expressed from a polynucleotide encoding the immunoconjugate. As used herein, "fusion protein" refers to a protein created through the joining of two or more genes or gene fragments which originally coded for separate proteins (including peptides and polypeptides) . Translation of the fusion gene results in a single protein with functional properties derived from each of the original proteins.The term "active moiety" or "payload" as used herein generally refers to the portion of a conjugated compound that constitutes an active agent, which mediates a pharmaceutical effect including but not limited to prophylactic, therapeutic, and / or diagnostic effects, for example, an anti-cancer, anti-inflammatory, anti-infective (e.g., anti-fungal, antibacterial, anti-parasitic, anti-viral) or an anesthetic agent. Methods for attaching each of these to a linker compatible with the antibodies and method of the present disclosure are known in the art. See, e.g., Singh et al., (2009) Therapeutic Antibodies: Methods and Protocols, vol. 525, 445-457. In addition, an "active moiety" or a “payload” can be a biophysical probe, a fluorophore, a spin label, an infrared probe, an affinity probe, a chelator, a spectroscopic probe, a radioactive probe, a lipid molecule, a polyethylene glycol, a polymer, DNA, RNA, a protein, a peptide, a surface, an antibody, an antibody fragment, a nanoparticle, a quantum dot, a liposome, a PLGA particle, a saccharide or a polysaccharide.As used herein, the term “drug moiety” or “D” generally refers to any compound possessing a desired biological activity and a reactive functional group that may be used to incorporate the drug into the conjugate of the disclosure. In some embodiments, the drug moiety indicate a cytotoxic drug useful in cancer therapy; a protein or polypeptide possessing a desired biological activity, such as a toxin, e.g., abrin, ricin A, pseudomonas exotoxin, and diphtheria toxin; other suitable proteins include tumor necrosis factor, α-interferon, β-interferon, nerve growth factor, platelet derived growth factor, tissue plasminogen activator, and biological response modifiers, for example, lymphokines, interleukin-1 (IL-1) , interleukin-2 (IL-2) , interleukin-6 (IL-6) , granulocyte macrophage colony stimulating factor (GM-CSF) , granulocyte colony stimulating factor (G-CSF) or other growth factors. In some embodiments, the term “drug moiety” may be a chemical moiety. In certain aspects, a drug moiety is selected from a V-ATPase inhibitor, a HSP90 inhibitor, an IAP inhibitor, an mTor inhibitor, a microtubule stabilizer, a microtubule destabilizer, an auristatin, a dolastatin, a maytansinoid, a MetAP (methionine aminopeptidase) , an inhibitor of nuclear export of proteins CRM1, a DPPIV inhibitor, an inhibitor of phosphoryl transfer reactions in mitochondria, a protein synthesis inhibitor, a kinase inhibitor, a CDK2 inhibitor, a CDK9 inhibitor, a proteasome inhibitor, a kinesin inhibitor, an HDAC inhibitor, a DNA damaging agent, a DNA alkylating agent, a DNA intercalator, a DNA minor groove binder and a DHFR inhibitor.In one embodiment, the drug moiety can be microtubule disrupting drugs such as auristatin, e.g., monomethyl auristatin E (MMAE) , monomethyl auristatin F (MMAF) , and auristatin F (AF) . In another embodiment, the drug moiety can be microtubule disrupting drugs such as maytansinoids, e.g., DM1, DM3, and DM4. In another embodiment, the drug moiety can be DNA damaging agents such as calicheamicins, duocarmycins, SN-38, and pyrrolo [2, 1-c] [1, 4] benzodi-azepines (PBDs) . Still in other embodiments, the drug moiety can be amanitins, anthracyclines, baccatins, camptothecins, cemadotins, colchicines, colcimids, combretastatins, cryptophycins, discodermolides, docetaxel, doxorubicin, echinomycins, eleutherobins, epothilones, estramustines, lexitropsins, maytansines, methotrexate, netropsins, puromycins, rhizoxins, taxanes, tubulysins or vinca alkaloids.As used herein, the term “topoisomerase inhibitor” usually refers to a compound that inhibits topoiosmerase activity. Compounds known as topoisomerase I inhibitors have activity against topoisomerase I, and the topoiosmerase II inhibitors have activity against topoisomerase II. Some compounds have activity against both topoisomerase I and topoisomerase II and are known as topoisomerase I / II inhibitors. Preferred topoisomerase I inhibitors for use in the present invention are camptothecin and analogs of camptothecin. Camptothecin is a pentacyclic alkaloid initially isolated from the wood and bark of Camptotheca acuminata, a tree indigenous to China (Wall, M.E. et al, J. Am. Chem. Soc, 94: 388 (1966) ) . Camptothecin exerts its pharmacological effects by irreversibly inhibiting topoisomerase I. Methods for the synthesis of camptothecin and camptothecin analogs or derivatives are known and are summarized and as set forth in U.S. Patent No. 5,244,903, which is herein incorporated by reference in its entirety.As used herein, the term “camptothecin” generally includes camptothecin and camptothecin derivatives including irinotecan, topotecan, lurtotecan, silatecan, etirinotecan pegol, TAS 103, 9-aminocamptothecin, 7-ethylcamptothecin, 10-hydroxycamptothecin, 9-nitrocamptothecin, 10, 11-methylenedioxycamptothecin, 9-amino- 10, 11-methylenedioxycamptothecin, 9-chloro-10, 11-methylenedioxycamptothecin, 7- (4-methylpiperazinomethylene) -10, 1 1-ethylenedioxy-20 (S) -camptothecin, 7- (4-methylpiperazinomethylene) -10, 1 1-methylenedioxy-20 (S) -camptothecin, and 7- (2- (N-isopropylamino) ethyl) - (20S) -camptothecin, and stereoisomers, salts and esters thereof.As used herein, the term “linker” described in the present disclosure includes a cleavable linker or a noncleavable linker. Cleavable linkers can be chemically labile and enzyme-labile linkers. Due to the high plasma stability and good intracellular cleaving selectivity and efficiency, enzyme-labile linkers are broadly selected as cleavable linker candidates in ADCs. In some embodiments, enzyme-labile linkers may include a peptide unit (-AAs-) selected from a group consisting of -valline-citruline- (-Val-Cit-) , -valline-lysine- (-Val-Lys-) , -valline-arginine- (-Val-Arg-) , -phenylalanine-citruline- (-Phe-Cit-) , -phenylalanine-lysine- (-Phe-Lys-) , and -phenylalanine-arginine- (-Phe-Arg-) . Typical enzyme-labile linkers include -Val-Cit-and -Phe-Lys-, which can be recognized by cathepsin B. In some embodiments, the noncleavable linker may be linkers that are capable of increasing the hydrophilicity of the resulting ADC. In one embodiment, the noncleavable linker may include one or more poly (ethylene glycol) (PEG) . In other embodiment, the noncleavable linker may be PEG, PEG diamine (NH2-PEG-NH2) , amine-PEG-hydroxyl (NH2-PEG-OH) , amine-PEG-COOH (NH2-PEG-COOH) , diethylene triamine or a combination thereof. In some embodiments, PEG may be represented by - (CH2CH2O) x-, wherein x may be an integer ranging from 1 to 20.As used herein, the term "toxin, " "cytotoxin" or "cytotoxic agent" as used herein, generally refers to any agent that is detrimental to the growth and proliferation of cells and may act to reduce, inhibit or destroy a cell or malignancy.As used herein, “cancer” or “tumor” as used interchangeably herein is meant to a group of diseases which can be treated according to the disclosure and involve abnormal cell growth with the potential to invade or spread to other parts of the body. Not all tumors are cancerous; benign tumors do not spread to other parts of the body. Possible signs and symptoms include: a new lump, abnormal bleeding, a prolonged cough, unexplained weight loss, and a change in bowel movements among others. There are over 100 different known cancers that affect humans. As used herein, “cancer” includes, without limitation, a solid cancer (e.g., a tumor) and a hematologic malignancy. A “hematologic malignancy” , also known as a blood cancer, is a cancer that originates in blood-forming tissue, such as the bone marrow or other cells of the immune system. Hematologic malignancies include, without limitation, leukemias (such as acute myeloid leukemia (ANIL) , acute promyelocytic leukemia, acute lymphoblastic leukemia (ALL) , acute mixed lineage leukemia, chronic myeloid leukemia, chronic lymphocytic leukemia (CLL) , hairy, cell leukemia and large granular lymphocytic leukemia) , myelodysplastic syndrome (MDS) , myeloproliferative disorders (polycythemia vera, essential thrombocytosis, primary myelofibrosis and chronic myeloid leukemia) , lymphomas, multiple myeloma, MGUS and similar disorders, Hodgkin’s lymphoma, non-Hodgkin lymphoma (NHL) , primary mediastinal large B-cell lymphoma, diffuse large B-cell lymphoma, follicular lymphoma, transformed follicular lymphoma, splenic marginal zone lymphoma, lymphocytic lymphoma, T-cell lymphoma, and other B-cell malignancies. “Solid cancers” include, without limitation, fibrosarcoma, myxosarcoma, liposarcoma, chondrosarcoma, osteogenic sarcoma, chordoma, angiosarcoma, endotheliosarcoma, lymphangiosarcoma, lymphangioendotheliosarcoma, synovioma, mesothelioma, Ewing's tumor, leiomyosarcoma, rhabdomyosarcoma, colon cancer, colorectal cancer, kidney cancer, pancreatic cancer, bone cancer, breast cancer, ovarian cancer, prostate cancer, esophogeal cancer, stomach cancer, oral cancer, nasal cancer, throat cancer, squamous cell carcinoma, basal cell carcinoma, adenocarcinoma, sweat gland carcinoma, sebaceous gland carcinoma, papillary carcinoma, papillary adenocarcinomas, cystadenocarcinoma, medullary carcinoma, bronchogenic carcinoma, renal cell carcinoma, hepatoma, bile duct carcinoma, choriocarcinoma, seminoma, embryonal carcinoma, Wilms'tumor, cervical cancer, uterine cancer, testicular cancer, small cell lung carcinoma, bladder carcinoma, lung cancer, epithelial carcinoma, glioma, glioblastoma multiforme, astrocytoma, medulloblastoma, craniopharyngioma, ependymoma, pinealoma, hemangioblastoma, acoustic neuroma, oligodendroglioma, meningioma, skin cancer, melanoma, neuroblastoma, retinoblastoma.As used herein, the term "anti-tumor agent" or "antitumor drug" as used herein generally refers to any agent that can be used to treat a cell proliferative disorder such as cancer, including but not limited to, cytotoxic agents, chemotherapeutic agents, radiotherapy and radiotherapeutic agents, targeted anti-cancer agents, and immunotherapeutic agents.As used herein, the term "anti-tumor activity" means a reduction in the rate of tumor cell proliferation, viability or metastatic activity. A possible way of showing anti-tumor activity is to show a decline in growth rate of tumor cells, tumor size stasis or tumor size reduction. Such activity can be assessed using accepted in vitro or in vivo tumor models, including but not limited to xenograft models, allograft models, MMTV models, and other known models known in the art to investigate anti-tumor activity.As used herein, the term CDH17 refers to “cadherin-17” . CDH17 is a member of the cadherin superfamily of calcium-dependent, membrane-associated glycoproteins. The encoded protein is cadherin-like, consisting of an extracellular region, containing 7 cadherin domains (i.e., ECD 1 through 7) , and a transmembrane region and a short cytoplasmic domain. Human CDH17 is represented by SEQ ID NO: 126 as well as in database accession number UniProt Q12864.3. Human CDH17 ECD1 is represented by amino acid positions 30 to 128 in SEQ ID NO: 126. Human CDH17 ECD2 is represented by amino acid positions 129 to 244 in SEQ ID NO: 126. Human CDH17 ECD3 is represented by amino acid positions 245 to 340 in SEQ ID NO: 126 and has an amino acid sequence shown in SEQ ID NO: 127 and ECD4 is represented by amino acid positions 341 to 449 in SEQ ID NO: 126 and has an amino acid sequence shown in SEQ ID NO: 128. Human CDH17 ECD5 is represented by amino acid positions 450 to 566 in SEQ ID NO: 126. Human CDH17 ECD6 is represented by amino acid positions 567 to 667 in SEQ ID NO: 126. Human CDH17 ECD7 is represented by amino acid positions 668 to 777 in SEQ ID NO: 126.In the present description, the term “epitope” is generally used to mean the partial peptide or partial three-dimensional structure of CDH17, to which a specific anti-CDH17 antibody binds.The terms "CDH17 expressing tumor " or "CDH17 positive tumor " generally refers to a tumor that express CDH17 and / or a mutant form of CDH17 on the surface of tumor cells.As used herein, the term "subject" includes human and non-human animals. Non-human animals include all vertebrates, e.g., mammals and non-mammals, such as non-human primates, sheep, dog, cow, chickens, amphibians, and reptiles. Except when noted, the terms "patient" or "subject" are used herein interchangeably.As used herein, the term "pharmaceutically acceptable" generally refers to one or more non-toxic substances that do not interfere with the effectiveness of the biological activity of the active ingredient. Such formulations may typically contain salts, buffers, preservatives, compatible carriers, and optionally other therapeutic agents. Such pharmaceutically acceptable formulations may also typically contain compatible solid or liquid fillers, diluents, or encapsulating materials suitable for administration to humans. When used in medicine, the salt should be a pharmaceutically acceptable salt, but non-pharmaceutically acceptable salts can be conveniently used to prepare pharmaceutically acceptable salts and cannot be excluded from the scope of the present invention. Such pharmacologically and pharmaceutically acceptable salts include, but are not limited to, salts prepared from the following acids: hydrochloric acid, hydrobromic acid, sulfuric acid, nitric acid, phosphoric acid, maleic acid, acetic acid, salicylic acid, citric acid, boric acid, formic acid, malonic acid, succinic acid, etc. Pharmacologically acceptable salts can also be prepared as alkali metal salts or alkaline earth metal salts, such as sodium, potassium or calcium salts. The term "solvate" is used herein in the conventional sense to refer to a complex of a solute (e.g., an active compound, a salt of an active compound) and a solvent. Solvates usually do not significantly alter the physiological activity or toxicity of the compound and therefore can act as pharmacological equivalents. If the solvent is water, the solvent compound may be conveniently referred to as a hydrate, e.g., monohydrate, dihydrate, trihydrate, etc.As used herein, the terms "treat, " "treating, " or "treatment" of any disease or disorder generally refer in one aspect, to ameliorating the disease or disorder (i.e., slowing or arresting or reducing the development of the disease or at least one of the clinical symptoms thereof) . In another aspect, "treat, " "treating, " or "treatment" refers to alleviating or ameliorating at least one physical parameter including those which may not be discernible by the patient. In yet another aspect, "treat, " "treating, " or "treatment" refers to modulating the disease or disorder, either physically, (e.g., stabilization of a discernible symptom) , physiologically, (e.g., stabilization of a physical parameter) or both. In yet another aspect, "treat, " "treating, " or "treatment" refers to preventing or delaying the onset or development or progression of the disease or disorder.As used herein, the term "therapeutically acceptable amount" or "therapeutically effective dose" interchangeably refers to an amount sufficient to effect the desired result (i.e., a reduction in tumor size, inhibition of tumor growth, prevention of metastasis, inhibition or prevention of viral, bacterial, fungal or parasitic infection) . In some aspects, a therapeutically acceptable amount does not induce or cause undesirable side effects. A therapeutically acceptable amount can be determined by first administering a low dose, and then incrementally increasing that dose until the desired effect is achieved. A "prophylactically effective dosage, " and a "therapeutically effective dosage, " of the molecules of the present disclosure can prevent the onset of or result in a decrease in severity of, respectively, disease symptoms, including symptoms associated with cancer.As used herein, the term "co-administer" generally refers to the simultaneous presence of two active agents in the blood of an individual. Active agents that are co-administered can be concurrently or sequentially delivered.As used herein, the terms "comprising" , "containing" , "having" , "include" , and "including" are to be construed as "including, but not limited to" unless otherwise noted. The terms "a, " "an, " and "the" and similar referents in the context of describing the invention and, specifically, in the context of the appended claims, are to be construed to cover both the singular and the plural unless otherwise noted. The use of any and all examples or exemplary language ( "for example" , "e.g. " , "such as" ) is intended merely to illustrate aspects or embodiments of the invention, and is not to be construed as limiting the scope thereof, unless otherwise claimed.As used herein, the term "about" when referring to a measurable value such as an amount, a temporal duration, and the like, is meant to encompass variations of ±20%or in some instances ±10%or in some instances ±5%or in some instances ±1%or in some instances ±0.1%from the specified value, as such variations are appropriate to perform the disclosed methods.The term "vector" includes shuttle and expression vectors. Typically, a vector could be a plasmid construct that also include an origin of replication (e.g., the Col E1 origin of replication) and a selectable marker (e.g., ampicillin or tetracycline resistance) , for replication and selection, respectively, of the plasmids in bacteria. An "expression vector" refers to a vector that contains the necessary control sequences or regulatory elements for expression of the antibodies including antibody fragment of the present disclosure, in bacterial or eukaryotic cells.The term “mono-specific antibody” as used herein refers to an antibody having one single specificity to one antigen or a fragment thereof (such as human CDH17 or any of its seven ECDs) . The term “multi-specific antibody” as used herein refers to an antibody having two or more specificities to one or more antigens or to different epitopes of the same antigen. The term multi-specific antibody may be a bi-specific or tri-specific antibody. For example, a bi-specific antibody may comprise a first specificity to a first antigen (e.g., CDH17) and a second specificity to a second antigen (e.g., a tumor associated antigen or tumor specific antigen) different from the first antigen. For example, a bi-specific antibody may comprise a first specificity to a first epitope (e.g., ECD3 of CDH17) of an antigen and a second specificity to a second different epitope (e.g., ECD4 of CDH17) of the same antigen. For example, a bi-specific antibody may comprise a first specificity to a first epitope (e.g., a first fragment of ECD4 of CDH17) of an antigen and a second specificity to a second epitope (e.g., a second different fragment of ECD4 of CDH17) of the same antigen.As used herein, the term "monoclonal antibody" refers to an antibody from a group of substantially uniform antibodies, i.e., antibodies that make up the group are identical except for a small number of possible natural mutations. A monoclonal antibody has high specificity for one determinant (epitope) of an antigen, while a comparative polyclonal antibody contains different antibodies for different determinants (epitopes) . In addition to specificity, the monoclonal antibody has the advantage of being free from contamination by other antibodies during synthesis. In the context of the present disclosure, a monoclonal antibody also specifically includes a chimeric antibody, i.e., a portion of a heavy chain and / or a light chain is the same as or homologous to a type, a class, or a subclass of antibodies, while the rest is the same as or homologous to another type, another class, or another subclass of antibodies, provided the antibody has required bioactivity. The chimeric antibody available in the disclosure includes an antibody containing a variable region antigen binding sequence from a rodent (e.g., a rat or a mouse) and a human constant region sequence.Antibodies Binding to CDH17In one aspect, provided is an antibody binding to CDH17 and an antigen binding fragment of the antibody, wherein the antibody or the antigen binding fragment thereof specifically binds to a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128 or in SEQ ID NO: 166.In some embodiments, the antibody binding to CDH17 specifically binds to a polypeptide having an amino acid sequence shown in SEQ ID NO: 127. In some embodiments, the antibody binding to CDH17 specifically binds to a polypeptide having an amino acid sequence shown in SEQ ID NO: 128. In some embodiments, the antibody binding to CDH17 specifically binds to a polypeptide having an amino acid sequence shown in SEQ ID NO: 166.In some embodiments, the antibody binding to CDH17 specifically binds to a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and SEQ ID NO: 128. In these embodiments, the polypeptide is a fusion of the polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and the polypeptide having an amino acid sequence shown in SEQ ID NO: 128. Preferably, the fusion contains from N terminus to C terminus the polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and the polypeptide having an amino acid sequence shown in SEQ ID NO: 128.In some embodiments, the antibody or the antigen binding fragment thereof specifically binding to a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128 or in SEQ ID NO: 166 has competitive binding activity with the polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128 or in SEQ ID NO: 166 against an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence selected from a group consisting of SEQ ID NO: 1, 3, 5, 19, 21, 23, 25, 27, 37, 39, 41, 170, 174, and an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to each thereof, and a light chain variable region having an amino acid sequence selected from a group consisting of SEQ ID NO: 2, 4, 6, 29, 31, 33, 35, 43, 45, 47, 172, 176, and an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to each thereof.In one embodiment, the antibody or the antigen binding fragment thereof specifically binding to a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128 or in SEQ ID NO: 166 competes with an anti-CDH17 antibody for binding a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128, wherein the anti-CDH17 antibody comprises a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 1 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 1, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 2 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 2.In one embodiment, the antibody or the antigen binding fragment thereof specifically binding to a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128 or in SEQ ID NO: 166 competes with an anti-CDH17 antibody for binding a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128, wherein the anti-CDH17 antibody comprises a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 3 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 3, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 4 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 4.In one embodiment, the antibody or the antigen binding fragment thereof specifically binding to a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128 or in SEQ ID NO: 166 competes with an anti-CDH17 antibody for binding a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128, wherein the anti-CDH17 antibody comprises a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 5 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 5, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 6 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 6.In one embodiment, the antibody or the antigen binding fragment thereof specifically binding to a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128 or in SEQ ID NO: 166 competes with an anti-CDH17 antibody for binding a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128, wherein the anti-CDH17 antibody comprises a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 19 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 19, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 29 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 29.In one embodiment, the antibody or the antigen binding fragment thereof specifically binding to a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128 or in SEQ ID NO: 166 competes with an anti-CDH17 antibody for binding a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128, wherein the anti-CDH17 antibody comprises a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 21 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 21, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 31 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 31.In one embodiment, the antibody or the antigen binding fragment thereof specifically binding to a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128 or in SEQ ID NO: 166 competes with an anti-CDH17 antibody for binding a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128, wherein the anti-CDH17 antibody comprises a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 23 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 23, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 33 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 33.In one embodiment, the antibody or the antigen binding fragment thereof specifically binding to a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128 or in SEQ ID NO: 166 competes with an anti-CDH17 antibody for binding a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128, wherein the anti-CDH17 antibody comprises a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 19 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 19, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 35 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 35.In one embodiment, the antibody or the antigen binding fragment thereof specifically binding to a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128 or in SEQ ID NO: 166 competes with an anti-CDH17 antibody for binding a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128, wherein the anti-CDH17 antibody comprises a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 25 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 25, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 35 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 35.In one embodiment, the antibody or the antigen binding fragment thereof specifically binding to a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128 or in SEQ ID NO: 166 competes with an anti-CDH17 antibody for binding a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128, wherein the anti-CDH17 antibody comprises a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 27 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 27, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 35 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 35.In one embodiment, the antibody or the antigen binding fragment thereof specifically binding to a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128 or in SEQ ID NO: 166 competes with an anti-CDH17 antibody for binding a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128, wherein the anti-CDH17 antibody comprises a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 37 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 37, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 43 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 43.In one embodiment, the antibody or the antigen binding fragment thereof specifically binding to a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128 or in SEQ ID NO: 166 competes with an anti-CDH17 antibody for binding a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128, wherein the anti-CDH17 antibody comprises a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 39 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 39, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 45 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 45.In one embodiment, the antibody or the antigen binding fragment thereof specifically binding to a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128 or in SEQ ID NO: 166 competes with an anti-CDH17 antibody for binding a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128, wherein the anti-CDH17 antibody comprises a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 41 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 41, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 47 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 47.In one embodiment, the antibody or the antigen binding fragment thereof specifically binding to a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128 or in SEQ ID NO: 166 competes with an anti-CDH17 antibody for binding a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128, wherein the anti-CDH17 antibody comprises a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 174 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 174, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 176 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 176.In one embodiment, the antibody or the antigen binding fragment thereof specifically binding to a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128 or in SEQ ID NO: 166 competes with an anti-CDH17 antibody for binding a polypeptide having an amino acid sequence shown in SEQ ID NO: 166, wherein the anti-CDH17 antibody comprises a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 170 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 172, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 172 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 172.In one embodiment, the antibody or the antigen binding fragment thereof specifically binding to a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128 or in SEQ ID NO: 166 competes with an anti-CDH17 antibody for binding a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128, wherein the anti-CDH17 antibody comprises a heavy chain having an amino acid sequence shown in SEQ ID NO: 7 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 7, and a light chain having an amino acid sequence shown in SEQ ID NO: 8 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 8;In one embodiment, the antibody or the antigen binding fragment thereof specifically binding to a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128 or in SEQ ID NO: 166 competes with an anti-CDH17 antibody for binding a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128, wherein the anti-CDH17 antibody comprises a heavy chain having an amino acid sequence shown in SEQ ID NO: 9 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 9, and a light chain having an amino acid sequence shown in SEQ ID NO: 10 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 10.In one embodiment, the antibody or the antigen binding fragment thereof specifically binding to a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128 or in SEQ ID NO: 166 competes with an anti-CDH17 antibody for binding a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128, wherein the anti-CDH17 antibody comprises a heavy chain having an amino acid sequence shown in SEQ ID NO: 11 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 11, and a light chain having an amino acid sequence shown in SEQ ID NO: 12 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 12.In one embodiment, the antibody or the antigen binding fragment thereof specifically binding to a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128 or in SEQ ID NO: 166 competes with an anti-CDH17 antibody for binding a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128, wherein the anti-CDH17 antibody comprises a heavy chain having an amino acid sequence shown in SEQ ID NO: 20 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 20, and a light chain having an amino acid sequence shown in SEQ ID NO: 30 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 30.In one embodiment, the antibody or the antigen binding fragment thereof specifically binding to a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128 or in SEQ ID NO: 166 competes with an anti-CDH17 antibody for binding a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128, wherein the anti-CDH17 antibody comprises a heavy chain having an amino acid sequence shown in SEQ ID NO: 22 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 22, and a light chain having an amino acid sequence shown in SEQ ID NO: 32 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 32.In one embodiment, the antibody or the antigen binding fragment thereof specifically binding to a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128 or in SEQ ID NO: 166 competes with an anti-CDH17 antibody for binding a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128, wherein the anti-CDH17 antibody comprises a heavy chain having an amino acid sequence shown in SEQ ID NO: 24 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 24, and a light chain having an amino acid sequence shown in SEQ ID NO: 34 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 34.In one embodiment, the antibody or the antigen binding fragment thereof specifically binding to a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128 or in SEQ ID NO: 166 competes with an anti-CDH17 antibody for binding a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128, wherein the anti-CDH17 antibody comprises a heavy chain having an amino acid sequence shown in SEQ ID NO: 20 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 20, and a light chain having an amino acid sequence shown in SEQ ID NO: 36 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 36.In one embodiment, the antibody or the antigen binding fragment thereof specifically binding to a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128 or in SEQ ID NO: 166 competes with an anti-CDH17 antibody for binding a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128, wherein the anti-CDH17 antibody comprises a heavy chain having an amino acid sequence shown in SEQ ID NO: 26 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 26, and a light chain having an amino acid sequence shown in SEQ ID NO: 36 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 36.In one embodiment, the antibody or the antigen binding fragment thereof specifically binding to a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128 or in SEQ ID NO: 166 competes with an anti-CDH17 antibody for binding a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128, wherein the anti-CDH17 antibody comprises a heavy chain having an amino acid sequence shown in SEQ ID NO: 28 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 28, and a light chain having an amino acid sequence shown in SEQ ID NO: 36 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 36.In one embodiment, the antibody or the antigen binding fragment thereof specifically binding to a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128 or in SEQ ID NO: 166 competes with an anti-CDH17 antibody for binding a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128, wherein the anti-CDH17 antibody comprises a heavy chain having an amino acid sequence shown in SEQ ID NO: 38 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 38, and a light chain having an amino acid sequence shown in SEQ ID NO: 44 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 44.In one embodiment, the antibody or the antigen binding fragment thereof specifically binding to a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128 or in SEQ ID NO: 166 competes with an anti-CDH17 antibody for binding a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128, wherein the anti-CDH17 antibody comprises a heavy chain having an amino acid sequence shown in SEQ ID NO: 40 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 40, and a light chain having an amino acid sequence shown in SEQ ID NO: 46 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 46.In one embodiment, the antibody or the antigen binding fragment thereof specifically binding to a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128 or in SEQ ID NO: 166 competes with an anti-CDH17 antibody for binding a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128, wherein the anti-CDH17 antibody comprises a heavy chain having an amino acid sequence shown in SEQ ID NO: 42 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 42, and a light chain having an amino acid sequence shown in SEQ ID NO: 48 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 48.In one embodiment, the antibody or the antigen binding fragment thereof specifically binding to a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128 or in SEQ ID NO: 166 competes with an anti-CDH17 antibody for binding a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128, wherein the anti-CDH17 antibody comprises a heavy chain having an amino acid sequence shown in SEQ ID NO: 175 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 175, and a light chain having an amino acid sequence shown in SEQ ID NO: 177 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 177.In one embodiment, the antibody or the antigen binding fragment thereof specifically binding to a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128 or in SEQ ID NO: 166 competes with an anti-CDH17 antibody for binding a polypeptide having an amino acid sequence shown in SEQ ID NO: 166, wherein the anti-CDH17 antibody comprises a heavy chain having an amino acid sequence shown in SEQ ID NO: 171 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 171, and a light chain having an amino acid sequence shown in SEQ ID NO: 173 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 173.In some embodiments, the antibody specifically binding to a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128 or in SEQ ID NO: 166 may be a mono-specific antibody, a multi-specific antibody (e.g., a bispecific antibody or a tri-specific antibody) , an intact antibody, a human antibody, a humanized antibody or a chimeric antibody. In preferable embodiments, the antibody specifically binding to a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128 or in SEQ ID NO: 166 may be a human antibody or a humanized antibody. In some embodiments, the antibody specifically binding to a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128 or in SEQ ID NO: 166 may be a monoclonal antibody.In some embodiments, the antibody specifically binding to a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128 or in SEQ ID NO: 166 may be an antibody that possesses an ability to internalize that permits cellular uptake. In some embodiments, the antibody specifically binding to a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128 or in SEQ ID NO: 166 may be an antibody that possesses an ability to internalize that permits uptake by a cancer cell, e.g., a pancreatic cancer cell, a gastric cancer cell, a colorectal cancer cell, cholangiocarcinoma cancer cell, a liver cancer cell, a neuroendocrine cancer cell, or an esophageal adenocarcinoma cell.In some embodiments, provided is an antibody specifically binding to cadherin-17, preferably human cadherin-17, or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 which are same as the HCDR1, HCDR2, and HCDR3 of a heavy chain variable region having an amino acid sequence selected from a group consisting of SEQ ID NO: 1, 3, 5, 19, 21, 23, 25, 27, 37, 39, 41, 170, and 174, and / or a light chain variable region comprising LCDR1, LCDR2, and LCDR3 which are same as the LCDR1, LCDR2, and LCDR3 of a light chain variable region having an amino acid sequence selected from a group consisting of SEQ ID NO: 2, 4, 6, 29, 31, 33, 35, 43, 45, 47, 172, and 176.In some embodiments, provided is an antibody specifically binding to cadherin-17, preferably human cadherin-17, or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 which are same as the HCDR1, HCDR2, and HCDR3 of a heavy chain variable region having an amino acid sequence selected from a group consisting of SEQ ID NO: 1, 3, 5, 19, 21, 23, 25, 27, 37, 39, 41, 170, and 174, and / or a light chain variable region comprising LCDR1, LCDR2, and LCDR3 which are same as the LCDR1, LCDR2, and LCDR3 of a light chain variable region having an amino acid sequence selected from a group consisting of SEQ ID NO: 2, 4, 6, 29, 31, 33, 35, 43, 45, 47, 172, and 176; wherein the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 are defined according to any one of CDR definition schemes selected from a group consisting of IMGT, Kabat, Contact, Chothia, Martin, PyIgClassify, and any combination thereof.In some embodiments, provided is an antibody specifically binding to cadherin-17, preferably human cadherin-17, or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 which are same as the HCDR1, HCDR2, and HCDR3 of a heavy chain variable region having an amino acid sequence selected from a group consisting of SEQ ID NO: 1, 3, 5, 19, 21, 23, 25, 27, 37, 39, 41, 170, and 174, and / or a light chain variable region comprising LCDR1, LCDR2, and LCDR3 which are same as the LCDR1, LCDR2, and LCDR3 of a light chain variable region having an amino acid sequence selected from a group consisting of SEQ ID NO: 2, 4, 6, 29, 31, 33, 35, 43, 45, 47, 172, and 176; wherein the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 are defined according to any one of CDR definition schemes selected from a group consisting of IMGT, Kabat, Contact, Chothia, and any combination thereof.In some embodiments, provided is an antibody specifically binding to cadherin-17, preferably human cadherin-17, or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 having amino acid sequences selected from a group consisting of:SEQ ID NO: 49, 50, and 51, respectively;SEQ ID NO: 68, 69, and 70, respectively;SEQ ID NO: 87, 88, and 89, respectively;SEQ ID NO: 109, 50, and 51, respectively;SEQ ID NO: 49, 50, and 113, respectively;SEQ ID NO: 49, 50, and 116, respectively;SEQ ID NO: 178, 179, and 180, respectively; andSEQ ID NO: 191, 192, and 193, respectively;according to IMGT definition scheme; or a group consisting of:SEQ ID NO: 55, 56, and 57, respectively;SEQ ID NO: 74, 75, and 76, respectively;SEQ ID NO: 93, 94, and 95, respectively;SEQ ID NO: 55, 106, and 57, respectively;SEQ ID NO: 110, 111, and 57, respectively;SEQ ID NO: 55, 106, and 114, respectively;SEQ ID NO: 55, 106, and 117, respectively;SEQ ID NO: 182, 183, and 184, respectively; andSEQ ID NO: 197, 198, and 199, respectively;according to Kabat definition scheme; or a group consisting of:SEQ ID NO: 60, 61, and 57, respectively;SEQ ID NO: 79, 80, and 76, respectively;SEQ ID NO: 98, 99, and 95, respectively;SEQ ID NO: 60, 61, and 114, respectively;SEQ ID NO: 60, 61, and 117, respectively;SEQ ID NO: 185, 186, and 184, respectively; andSEQ ID NO: 202, 203, and 199, respectively;according to Chothia definition scheme; or a group consisting of:SEQ ID NO: 62, 63, and 64, respectively;SEQ ID NO: 81, 82, and 83, respectively;SEQ ID NO: 100, 101, and 102, respectively;SEQ ID NO: 62, 107, and 64, respectively;SEQ ID NO: 62, 108, and 57, respectively;SEQ ID NO: 112, 108, and 64, respectively;SEQ ID NO: 62, 107, and 115, respectively;SEQ ID NO: 62, 107, and 118, respectively;SEQ ID NO: 81, 123, and 83, respectively;SEQ ID NO: 187, 188, and 189, respectively; andSEQ ID NO: 204, 205, and 206, respectively;according to Contact definition scheme.In some embodiments, provided is an antibody specifically binding to cadherin-17, preferably human cadherin-17, or an antigen binding fragment thereof, wherein the antibody comprises a light chain variable region comprising LCDR1, LCDR2, and LCDR3 having amino acid sequences selected from a group consisting of:SEQ ID NO: 52, 53, and 54, respectively;SEQ ID NO: 71, 72, and 73, respectively;SEQ ID NO: 90, 91, and 92, respectively;SEQ ID NO: 52, 53, and 181, respectively; andSEQ ID NO: 194, 195, and 196, respectively;according to IMGT definition scheme; or a group consisting of:SEQ ID NO: 58, 59, and 54, respectively;SEQ ID NO: 77, 78, and 73, respectively;SEQ ID NO: 96, 97, and 92, respectively;SEQ ID NO: 58, 120, and 54, respectively;SEQ ID NO: 58, 59, and 181, respectively; andSEQ ID NO: 200, 201, and 196, respectively;according to Kabat definition scheme; or a group consisting of:SEQ ID NO: 65, 66, and 67, respectively;SEQ ID NO: 84, 85, and 86, respectively;SEQ ID NO: 103, 104, and 105, respectively;SEQ ID NO: 65, 119, and 67, respectively;SEQ ID NO: 65, 121, and 67, respectively;SEQ ID NO: 65, 122, and 67, respectively;SEQ ID NO: 65, 66, and 190, respectively; andSEQ ID NO: 207, 208, and 209, respectively;according to Contact definition scheme.In some embodiments, provided is an antibody specifically binding to cadherin-17, preferably human cadherin-17, or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 having amino acid sequences selected from a group consisting of:SEQ ID NO: 49, 50, and 51, respectively;SEQ ID NO: 68, 69, and 70, respectively;SEQ ID NO: 87, 88, and 89, respectively;SEQ ID NO: 109, 50, and 51, respectively;SEQ ID NO: 49, 50, and 113, respectively;SEQ ID NO: 49, 50, and 116, respectively;SEQ ID NO: 178, 179, and 180, respectively; andSEQ ID NO: 191, 192, and 193, respectively;according to IMGT definition scheme; or a group consisting of:SEQ ID NO: 55, 56, and 57, respectively;SEQ ID NO: 74, 75, and 76, respectively;SEQ ID NO: 93, 94, and 95, respectively;SEQ ID NO: 55, 106, and 57, respectively;SEQ ID NO: 110, 111, and 57, respectively;SEQ ID NO: 55, 106, and 114, respectively;SEQ ID NO: 55, 106, and 117, respectively;SEQ ID NO: 182, 183, and 184, respectively; andSEQ ID NO: 197, 198, and 199, respectively;according to Kabat definition scheme; or a group consisting of:SEQ ID NO: 60, 61, and 57, respectively;SEQ ID NO: 79, 80, and 76, respectively;SEQ ID NO: 98, 99, and 95, respectively;SEQ ID NO: 60, 61, and 114, respectively;SEQ ID NO: 60, 61, and 117, respectively;SEQ ID NO: 185, 186, and 184, respectively; andSEQ ID NO: 202, 203, and 199, respectively;according to Chothia definition scheme; or a group consisting of:SEQ ID NO: 62, 63, and 64, respectively;SEQ ID NO: 81, 82, and 83, respectively;SEQ ID NO: 100, 101, and 102, respectively;SEQ ID NO: 62, 107, and 64, respectively;SEQ ID NO: 62, 108, and 57, respectively;SEQ ID NO: 112, 108, and 64, respectively;SEQ ID NO: 62, 107, and 115, respectively;SEQ ID NO: 62, 107, and 118, respectively;SEQ ID NO: 81, 123, and 83, respectively;SEQ ID NO: 187, 188, and 189, respectively; andSEQ ID NO: 204, 205, and 206, respectively;according to Contact definition scheme;and a light chain variable region comprising LCDR1, LCDR2, and LCDR3 having amino acid sequences selected from a group consisting of:SEQ ID NO: 52, 53, and 54, respectively;SEQ ID NO: 71, 72, and 73, respectively;SEQ ID NO: 90, 91, and 92, respectively;SEQ ID NO: 52, 53, and 181, respectively; andSEQ ID NO: 194, 195, and 196, respectively;according to IMGT definition scheme; or a group consisting of:SEQ ID NO: 58, 59, and 54, respectively;SEQ ID NO: 77, 78, and 73, respectively;SEQ ID NO: 96, 97, and 92, respectively;SEQ ID NO: 58, 120, and 54, respectively;SEQ ID NO: 58, 59, and 181, respectively; andSEQ ID NO: 200, 201, and 196, respectively;according to Kabat definition scheme; or a group consisting of:SEQ ID NO: 65, 66, and 67, respectively;SEQ ID NO: 84, 85, and 86, respectively;SEQ ID NO: 103, 104, and 105, respectively;SEQ ID NO: 65, 119, and 67, respectively;SEQ ID NO: 65, 121, and 67, respectively;SEQ ID NO: 65, 122, and 67, respectively;SEQ ID NO: 65, 66, and 190, respectively; andSEQ ID NO: 207, 208, and 209, respectively;according to Contact definition scheme.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 having amino acid sequences selected from a group consisting of:SEQ ID NO: 49, 50, and 51, respectively;SEQ ID NO: 68, 69, and 70, respectively;SEQ ID NO: 87, 88, and 89, respectively;SEQ ID NO: 109, 50, and 51, respectively;SEQ ID NO: 49, 50, and 113, respectively;SEQ ID NO: 49, 50, and 116, respectively;SEQ ID NO: 178, 179, and 180, respectively; andSEQ ID NO: 191, 192, and 193, respectively;and a light chain variable region comprising LCDR1, LCDR2, and LCDR3 having amino acid sequences selected from a group consisting of:SEQ ID NO: 52, 53, and 54, respectively;SEQ ID NO: 71, 72, and 73, respectively;SEQ ID NO: 90, 91, and 92, respectively;SEQ ID NO: 52, 53, and 181, respectively; andSEQ ID NO: 194, 195, and 196, respectively;according to IMGT definition scheme.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 having amino acid sequences selected from a group consisting of:SEQ ID NO: 55, 56, and 57, respectively;SEQ ID NO: 74, 75, and 76, respectively;SEQ ID NO: 93, 94, and 95, respectively;SEQ ID NO: 55, 106, and 57, respectively;SEQ ID NO: 110, 111, and 57, respectively;SEQ ID NO: 55, 106, and 114, respectively;SEQ ID NO: 55, 106, and 117, respectively;SEQ ID NO: 182, 183, and 184, respectively; andSEQ ID NO: 197, 198, and 199, respectively;and a light chain variable region comprising LCDR1, LCDR2, and LCDR3 having amino acid sequences selected from a group consisting of:SEQ ID NO: 58, 59, and 54, respectively;SEQ ID NO: 77, 78, and 73, respectively;SEQ ID NO: 96, 97, and 92, respectively;SEQ ID NO: 58, 120, and 54, respectively;SEQ ID NO: 58, 59, and 181, respectively; andSEQ ID NO: 200, 201, and 196, respectively;according to Kabat definition scheme.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 having amino acid sequences selected from a group consisting of:SEQ ID NO: 60, 61, and 57, respectively;SEQ ID NO: 79, 80, and 76, respectively;SEQ ID NO: 98, 99, and 95, respectively;SEQ ID NO: 60, 61, and 114, respectively;SEQ ID NO: 60, 61, and 117, respectively;SEQ ID NO: 185, 186, and 184, respectively; andSEQ ID NO: 202, 203, and 199, respectively;and a light chain variable region comprising LCDR1, LCDR2, and LCDR3 having amino acid sequences selected from a group consisting of:SEQ ID NO: 58, 59, and 54, respectively;SEQ ID NO: 77, 78, and 73, respectively;SEQ ID NO: 96, 97, and 92, respectively;SEQ ID NO: 58, 120, and 54, respectively;SEQ ID NO: 58, 59, and 181, respectively; andSEQ ID NO: 200, 201, and 196, respectively;according to Chothia definition scheme.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 having amino acid sequences selected from a group consisting of:SEQ ID NO: 62, 63, and 64, respectively;SEQ ID NO: 81, 82, and 83, respectively;SEQ ID NO: 100, 101, and 102, respectively;SEQ ID NO: 62, 107, and 64, respectively;SEQ ID NO: 62, 108, and 57, respectively;SEQ ID NO: 112, 108, and 64, respectively;SEQ ID NO: 62, 107, and 115, respectively;SEQ ID NO: 62, 107, and 118, respectively;SEQ ID NO: 81, 123, and 83, respectively;SEQ ID NO: 187, 188, and 189, respectively; andSEQ ID NO: 204, 205, and 206, respectively;and a light chain variable region comprising LCDR1, LCDR2, and LCDR3 having amino acid sequences selected from a group consisting of:SEQ ID NO: 65, 66, and 67, respectively;SEQ ID NO: 84, 85, and 86, respectively;SEQ ID NO: 103, 104, and 105, respectively;SEQ ID NO: 65, 119, and 67, respectively;SEQ ID NO: 65, 121, and 67, respectively;SEQ ID NO: 65, 122, and 67, respectively;SEQ ID NO: 65, 66, and 190, respectively; andSEQ ID NO: 207, 208, and 209, respectively;according to Contact definition scheme.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 and a light chain variable region comprising LCDR1, LCDR2, and LCDR3, wherein the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 have amino acid sequences selected from a group consisting of:SEQ ID NO: 49, 50, 51, 52, 53, and 54, respectively;SEQ ID NO: 68, 69, 70, 71, 72, and 73, respectively;SEQ ID NO: 87, 88, 89, 90, 91, and 92, respectively;SEQ ID NO: 109, 50, 51, 52, 53, and 54, respectively;SEQ ID NO: 49, 50, 113, 52, 53, and 54, respectively;SEQ ID NO: 49, 50, 116, 52, 53, and 54, respectively;SEQ ID NO: 178, 179, 180, 52, 53, and 181, respectively; andSEQ ID NO: 191, 192, 193, 194, 195, and 196, respectively;according to IMGT definition scheme.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 and a light chain variable region comprising LCDR1, LCDR2, and LCDR3, wherein the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 have amino acid sequences shown in SEQ ID NO: 49, 50, 51, 52, 53, and 54, respectively, according to IMGT definition scheme.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 and a light chain variable region comprising LCDR1, LCDR2, and LCDR3, wherein the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 have amino acid sequences shown in SEQ ID NO: 68, 69, 70, 71, 72, and 73, respectively, according to IMGT definition scheme.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 and a light chain variable region comprising LCDR1, LCDR2, and LCDR3, wherein the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 have amino acid sequences shown in SEQ ID NO: 87, 88, 89, 90, 91, and 92, respectively, according to IMGT definition scheme.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 and a light chain variable region comprising LCDR1, LCDR2, and LCDR3, wherein the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 have amino acid sequences shown in SEQ ID NO: 109, 50, 51, 52, 53, and 54, respectively, according to IMGT definition scheme.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 and a light chain variable region comprising LCDR1, LCDR2, and LCDR3, wherein the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 have amino acid sequences shown in SEQ ID NO: 49, 50, 113, 52, 53, and 54, respectively, according to IMGT definition scheme.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 and a light chain variable region comprising LCDR1, LCDR2, and LCDR3, wherein the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 have amino acid sequences shown in SEQ ID NO: 49, 50, 116, 52, 53, and 54, respectively, according to IMGT definition scheme.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 and a light chain variable region comprising LCDR1, LCDR2, and LCDR3, wherein the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 have amino acid sequences shown in SEQ ID NO: 178, 179, 180, 52, 53, and 181, respectively, according to IMGT definition scheme.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 and a light chain variable region comprising LCDR1, LCDR2, and LCDR3, wherein the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 have amino acid sequences shown in SEQ ID NO: 191, 192, 193, 194, 195, and 196, respectively, according to IMGT definition scheme.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 and a light chain variable region comprising LCDR1, LCDR2, and LCDR3, wherein the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 have amino acid sequences selected from a group consisting of:SEQ ID NO: 55, 56, 57, 58, 59, and 54, respectively;SEQ ID NO: 74, 75, 76, 77, 78, and 73, respectively;SEQ ID NO: 93, 94, 95, 96, 97, and 92, respectively;SEQ ID NO: 55, 106, 57, 58, 59, and 54, respectively;SEQ ID NO: 110, 111, 57, 58, 120, and 54, respectively;SEQ ID NO: 55, 106, 57, 58, 120, and 54, respectively;SEQ ID NO: 55, 106, 114, 58, 120, and 54, respectively;SEQ ID NO: 55, 106, 117, 58, 120, and 54, respectively;SEQ ID NO: 182, 183, 184, 58, 59, and 181, respectively; andSEQ ID NO: 197, 198, 199, 200, 201, and 196, respectively;according to Kabat definition scheme.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 and a light chain variable region comprising LCDR1, LCDR2, and LCDR3, wherein the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 have amino acid sequences shown in SEQ ID NO: 55, 56, 57, 58, 59, and 54, respectively, according to Kabat definition scheme.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 and a light chain variable region comprising LCDR1, LCDR2, and LCDR3, wherein the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 have amino acid sequences shown in SEQ ID NO: 74, 75, 76, 77, 78, and 73, respectively, according to Kabat definition scheme.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 and a light chain variable region comprising LCDR1, LCDR2, and LCDR3, wherein the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 have amino acid sequences shown in SEQ ID NO: 93, 94, 95, 96, 97, and 92, respectively, according to Kabat definition scheme.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 and a light chain variable region comprising LCDR1, LCDR2, and LCDR3, wherein the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 have amino acid sequences shown in SEQ ID NO: 55, 106, 57, 58, 59, and 54, respectively, according to Kabat definition scheme.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 and a light chain variable region comprising LCDR1, LCDR2, and LCDR3, wherein the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 have amino acid sequences shown in SEQ ID NO: 110, 111, 57, 58, 120, and 54, respectively, according to Kabat definition scheme.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 and a light chain variable region comprising LCDR1, LCDR2, and LCDR3, wherein the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 have amino acid sequences shown in SEQ ID NO: 55, 106, 57, 58, 120, and 54, respectively, according to Kabat definition scheme.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 and a light chain variable region comprising LCDR1, LCDR2, and LCDR3, wherein the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 have amino acid sequences shown in SEQ ID NO: 55, 106, 114, 58, 120, and 54, respectively, according to Kabat definition scheme.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 and a light chain variable region comprising LCDR1, LCDR2, and LCDR3, wherein the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 have amino acid sequences shown in SEQ ID NO: 55, 106, 117, 58, 120, and 54, respectively, according to Kabat definition scheme.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 and a light chain variable region comprising LCDR1, LCDR2, and LCDR3, wherein the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 have amino acid sequences shown in SEQ ID NO: 182, 183, 184, 58, 59, and 181, respectively, according to Kabat definition scheme.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 and a light chain variable region comprising LCDR1, LCDR2, and LCDR3, wherein the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 have amino acid sequences shown in SEQ ID NO: 197, 198, 199, 200, 201, and 196, respectively, according to Kabat definition scheme.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 and a light chain variable region comprising LCDR1, LCDR2, and LCDR3, wherein the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 have amino acid sequences selected from a group consisting of:SEQ ID NO: 60, 61, 57, 58, 59, and 54, respectively;SEQ ID NO: 79, 80, 76, 77, 78, and 73, respectively;SEQ ID NO: 98, 99, 95, 96, 97, and 92, respectively;SEQ ID NO: 60, 61, 57, 58, 120, and 54, respectivelySEQ ID NO: 60, 61, 114, 58, 120, and 54, respectively;SEQ ID NO: 60, 61, 117, 58, 120, and 54, respectively;SEQ ID NO: 185, 186, 184, 58, 59, and 181, respectively; andSEQ ID NO: 202, 203, 199, 200, 201, and 196, respectively;according to Chothia definition scheme.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 and a light chain variable region comprising LCDR1, LCDR2, and LCDR3, wherein the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 have amino acid sequences shown in SEQ ID NO: 60, 61, 57, 58, 59, and 54, respectively, according to Chothia definition scheme.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 and a light chain variable region comprising LCDR1, LCDR2, and LCDR3, wherein the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 have amino acid sequences shown in SEQ ID NO: 79, 80, 76, 77, 78, and 73, respectively, according to Chothia definition scheme.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 and a light chain variable region comprising LCDR1, LCDR2, and LCDR3, wherein the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 have amino acid sequences shown in SEQ ID NO: 98, 99, 95, 96, 97, and 92, respectively, according to Chothia definition scheme.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 and a light chain variable region comprising LCDR1, LCDR2, and LCDR3, wherein the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 have amino acid sequences shown in SEQ ID NO: 60, 61, 57, 58, 120, and 54, respectively, according to Chothia definition scheme.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 and a light chain variable region comprising LCDR1, LCDR2, and LCDR3, wherein the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 have amino acid sequences shown in SEQ ID NO: 60, 61, 114, 58, 120, and 54, respectively, according to Chothia definition scheme.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 and a light chain variable region comprising LCDR1, LCDR2, and LCDR3, wherein the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 have amino acid sequences shown in SEQ ID NO: 60, 61, 117, 58, 120, and 54, respectively, according to Chothia definition scheme.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 and a light chain variable region comprising LCDR1, LCDR2, and LCDR3, wherein the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 have amino acid sequences shown in SEQ ID NO: 185, 186, 184, 58, 59, and 181, respectively, according to Chothia definition scheme.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 and a light chain variable region comprising LCDR1, LCDR2, and LCDR3, wherein the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 have amino acid sequences shown in SEQ ID NO: 202, 203, 199, 200, 201, and 196, respectively, according to Chothia definition scheme.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 and a light chain variable region comprising LCDR1, LCDR2, and LCDR3, wherein the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 have amino acid sequences selected from a group consisting of:SEQ ID NO: 62, 63, 64, 65, 66, and 67, respectively;SEQ ID NO: 81, 82, 83, 84, 85, and 86, respectively;SEQ ID NO: 100, 101, 102, 103, 104, and 105, respectively;SEQ ID NO: 62, 107, 64, 65, 119, and 67, respectively;SEQ ID NO: 62, 108, 57, 65, 66, and 67, respectively;SEQ ID NO: 112, 108, 64, 65, 121, and 67, respectively;SEQ ID NO: 62, 107, 115, 65, 122, and 67, respectively;SEQ ID NO: 62, 107, 118, 65, 122, and 67, respectively;SEQ ID NO: 62, 107, 64, 65, 122, and 67, respectively;SEQ ID NO: 81, 123, 83, 84, 85, and 86, respectively;SEQ ID NO: 187, 188, 189, 65, 66, and 190, respectively; andSEQ ID NO: 204, 205, 206, 207, 208, and 209, respectively;according to Contact definition scheme.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 and a light chain variable region comprising LCDR1, LCDR2, and LCDR3, wherein the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 have amino acid sequences shown in SEQ ID NO: 62, 63, 64, 65, 66, and 67, respectively, according to Contact definition scheme.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 and a light chain variable region comprising LCDR1, LCDR2, and LCDR3, wherein the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 have amino acid sequences shown in SEQ ID NO: 81, 82, 83, 84, 85, and 86, respectively, according to Contact definition scheme.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 and a light chain variable region comprising LCDR1, LCDR2, and LCDR3, wherein the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 have amino acid sequences shown in SEQ ID NO: 100, 101, 102, 103, 104, and 105, respectively, according to Contact definition scheme.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 and a light chain variable region comprising LCDR1, LCDR2, and LCDR3, wherein the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 have amino acid sequences shown in SEQ ID NO: 62, 107, 64, 65, 119, and 67, respectively, according to Contact definition scheme.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 and a light chain variable region comprising LCDR1, LCDR2, and LCDR3, wherein the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 have amino acid sequences shown in SEQ ID NO: 62, 108, 57, 65, 66, and 67, respectively, according to Contact definition scheme.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 and a light chain variable region comprising LCDR1, LCDR2, and LCDR3, wherein the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 have amino acid sequences shown in SEQ ID NO: 112, 108, 64, 65, 121, and 67, respectively, according to Contact definition scheme.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 and a light chain variable region comprising LCDR1, LCDR2, and LCDR3, wherein the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 have amino acid sequences shown in SEQ ID NO: 62, 107, 115, 65, 122, and 67, respectively, according to Contact definition scheme.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 and a light chain variable region comprising LCDR1, LCDR2, and LCDR3, wherein the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 have amino acid sequences shown in SEQ ID NO: 62, 107, 118, 65, 122, and 67, respectively, according to Contact definition scheme.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 and a light chain variable region comprising LCDR1, LCDR2, and LCDR3, wherein the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 have amino acid sequences shown in SEQ ID NO: 62, 107, 64, 65, 122, and 67, respectively, according to Contact definition scheme.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 and a light chain variable region comprising LCDR1, LCDR2, and LCDR3, wherein the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 have amino acid sequences shown in SEQ ID NO: 81, 123, 83, 84, 85, and 86, respectively, according to Contact definition scheme.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 and a light chain variable region comprising LCDR1, LCDR2, and LCDR3, wherein the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 have amino acid sequences shown in SEQ ID NO: 187, 188, 189, 65, 66, and 190, respectively, according to Contact definition scheme.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 and a light chain variable region comprising LCDR1, LCDR2, and LCDR3, wherein the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 have amino acid sequences shown in SEQ ID NO: 204, 205, 206, 207, 208, and 209, respectively, according to Contact definition scheme.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region having an amino acid sequence selected from a group consisting of SEQ ID NO: 1, 3, 5, 19, 21, 23, 25, 27, 37, 39, 41, 170, 174, and an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to each thereof, and / or a light chain variable region having an amino acid sequence selected from a group consisting of SEQ ID NO: 2, 4, 6, 29, 31, 33, 35, 43, 45, 47, 172, 176, and an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to each thereof.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region having an amino acid sequence selected from a group consisting of SEQ ID NO: 1, 3, 5, 19, 21, 23, 25, 27, 37, 39, 41, 170, 174, and an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to each thereof.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a light chain variable region having an amino acid sequence selected from a group consisting of SEQ ID NO: 2, 4, 6, 29, 31, 33, 35, 43, 45, 47, 172, 176, and an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to each thereof.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region having an amino acid sequence selected from a group consisting of SEQ ID NO: 1, 3, 5, 19, 21, 23, 25, 27, 37, 39, 41, 170, 174, and an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to each thereof, and a light chain variable region having an amino acid sequence selected from a group consisting of SEQ ID NO: 2, 4, 6, 29, 31, 33, 35, 43, 45, 47, 172, 176, and an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to each thereof.In one embodiment, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody is an anti-CDH17 antibody comprises a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 1 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 1, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 2 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 2.In one embodiment, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody is an anti-CDH17 antibody comprises a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 3 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 3, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 4 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 4.In one embodiment, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody is an anti-CDH17 antibody comprises a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 5 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 5, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 6 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 6.In one embodiment, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody is an anti-CDH17 antibody comprises a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 19 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 19, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 29 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 29.In one embodiment, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody is an anti-CDH17 antibody comprises a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 21 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 21, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 31 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 31.In one embodiment, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody is an anti-CDH17 antibody comprises a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 23 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 23, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 33 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 33.In one embodiment, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody is an anti-CDH17 antibody comprises a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 19 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 19, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 35 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 35.In one embodiment, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody is an anti-CDH17 antibody comprises a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 25 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 25, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 35 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 35.In one embodiment, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody is an anti-CDH17 antibody comprises a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 27 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 27, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 35 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 35.In one embodiment, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody is an anti-CDH17 antibody comprises a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 37 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 37, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 43 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 43.In one embodiment, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody is an anti-CDH17 antibody comprises a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 39 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 39, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 45 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 45.In one embodiment, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody is an anti-CDH17 antibody comprises a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 41 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 41, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 47 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 47.In one embodiment, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody is an anti-CDH17 antibody comprises a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 170 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 170, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 172 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 172.In one embodiment, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody is an anti-CDH17 antibody comprises a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 174 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 174, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 176 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 176.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody has a heavy chain constant region and / or a light chain constant region. In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody has a human heavy chain constant region and a human light chain constant region. In some embodiments, the antibody specifically binding to cadherin-17 or an antigen binding fragment thereof comprises a human heavy chain constant region having an amino acid sequence shown in SEQ ID NO: 124. In some embodiments, the antibody specifically binding to cadherin-17 or an antigen binding fragment thereof comprises a human light chain constant region having an amino acid sequence shown in SEQ ID NO: 125. In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a human heavy chain constant region having an amino acid sequence shown in SEQ ID NO: 124 and a human light chain constant region having an amino acid sequence shown in SEQ ID NO: 125.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain having an amino acid sequence selected from a group consisting of SEQ ID NO: 7, 9, 11 , 20, 22, 24, 26, 28, 38, 40, 42, 171, 175, and an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to each thereof; and / or a light chain having an amino acid sequence selected from a group consisting of SEQ ID NO: 8, 10, 12, 30, 32, 34, 36, 44, 46, 48, 173, 177, and an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to each thereof.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain having an amino acid sequence selected from a group consisting of SEQ ID NO: 7, 9, 11 , 20, 22, 24, 26, 28, 38, 40, 42, 171, 175, and an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to each thereof.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a light chain having an amino acid sequence selected from a group consisting of SEQ ID NO: 8, 10, 12, 30, 32, 34, 36, 44, 46, 48, 173, 177, and an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to each thereof.In some embodiments, provided is an antibody specifically binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain having an amino acid sequence selected from a group consisting of SEQ ID NO: 7, 9, 11 , 20, 22, 24, 26, 28, 38, 40, 42, 171, 175, and an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to each thereof; and a light chain having an amino acid sequence selected from a group consisting of SEQ ID NO: 8, 10, 12, 30, 32, 34, 36, 44, 46, 48, 173, 177, and an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to each thereof.In one embodiment, provided is an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 7 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 7, and a light chain having an amino acid sequence shown in SEQ ID NO: 8 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 8.In one embodiment, provided is an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 9 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 9, and a light chain having an amino acid sequence shown in SEQ ID NO: 10 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 10.In one embodiment, provided is an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 11 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 11, and a light chain having an amino acid sequence shown in SEQ ID NO: 12 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 12.In one embodiment, provided is an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 20 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 20, and a light chain having an amino acid sequence shown in SEQ ID NO: 30 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 30.In one embodiment, provided is an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 22 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 22, and a light chain having an amino acid sequence shown in SEQ ID NO: 32 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 32.In one embodiment, provided is an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 24 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 24, and a light chain having an amino acid sequence shown in SEQ ID NO: 34 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 34.In one embodiment, provided is an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 20 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 20, and a light chain having an amino acid sequence shown in SEQ ID NO: 36 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 36.In one embodiment, provided is an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 26 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 26, and a light chain having an amino acid sequence shown in SEQ ID NO: 36 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 36.In one embodiment, provided is an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 28 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 28, and a light chain having an amino acid sequence shown in SEQ ID NO: 36 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 36.In one embodiment, provided is an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 38 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 38, and a light chain having an amino acid sequence shown in SEQ ID NO: 44 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 44.In one embodiment, provided is an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 40 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 40, and a light chain having an amino acid sequence shown in SEQ ID NO: 46 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 46.In one embodiment, provided is an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 42 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 42, and a light chain having an amino acid sequence shown in SEQ ID NO: 48 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 48.In one embodiment, provided is an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 171 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 171, and a light chain having an amino acid sequence shown in SEQ ID NO: 173 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 173.In one embodiment, provided is an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 175 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 175, and a light chain having an amino acid sequence shown in SEQ ID NO: 177 or an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to SEQ ID NO: 177.In some embodiments, the antibody specifically binding to CDH17 may be a mono-specific antibody, a multi-specific antibody (e.g., a bispecific antibody or a tri-specific antibody) , an intact antibody, a human antibody, a humanized antibody or a chimeric antibody. In preferable embodiments, the antibody specifically binding CDH17 may be a human antibody or a humanized antibody. In some embodiments, the antibody specifically binding to CDH17 may be a monoclonal antibody.In some embodiments, the antibody specifically binding to CDH17 may be an antibody that possesses an ability to internalize that permits cellular uptake. In some embodiments, the antibody specifically binding to CDH17 may be an antibody that possesses an ability to internalize that permits uptake by a cancer cell, e.g., a pancreatic cancer cell, a gastric cancer cell, a colorectal cancer cell, cholangiocarcinoma cancer cell, a liver cancer cell, a neuroendocrine cancer cell, or an esophageal adenocarcinoma cell.In any of the embodiments disclosed herein, the antigen binding fragment is selected from a group consisting of Fab, Fab’, Fv, F (ab’) 2, scFv, di-scFv and dAb, preferably Fab or scFv.ImmunoconjugatesAnother aspect of the disclosure relates to an immunoconjugate, a pharmaceutically acceptable salt thereof, or a solvate thereof, comprising the antibody or an antigen binding fragment thereof according to the “Antibodies Binding to CDH17” section described above, and an active agent or moiety conjugated to the antibody or an antigen binding fragment thereof.In some embodiments, and the active moiety can comprise a drug moiety and / or a label.In some embodiments, the drug moiety is selected from the group consisting of a cytotoxic agent, a cytokine, a nucleic acid, a nucleic acid-associated molecule, a radionuclide, a chemokine, an immuno (co) -stimulatory molecule, an immunosuppressive molecule, a death ligand, an apoptosis-inducing protein, a kinase, a prodrug-converting enzyme, a RNase, an agonistic antibody or antibody fragment, an antagonistic antibody or antibody fragment, a growth factor, a hormone, a coagulation factor, a fibrinolytic protein, peptides mimicking these, and fragments, fusion proteins and derivatives thereof.In some embodiments, the label is selected from the group consisting of a radiolabel, a fluorophore, a chromophore, an imaging agent, and a metal ion.In some embodiments, the cytotoxic agent comprises a microtubule disrupting drug and / or a DNA-damaging agent.In some embodiments, the cytotoxic agent can be selected from: Paclitaxel; cytochalasin B; short bacteriocin D; ethidium bromide; emetine; mitomycin; etoposide; onychothioside; thienoside; vincristine; colchicine; doxorubicin; erythromycin; dihydroxycarbamycin dione; microtubulin inhibitors; mitoxantrone; actinomycin D; 1-dehydrotestosterone; glucocorticoids; procaine; bupivacaine; lidocaine ; propranolol; puromycin; kallikrein or its analogs or derivatives; antimetabolites; alkylating agents; antibiotics; antimitotic agents; diphtheria toxin and related molecules and their active fragments and heterodimeric molecules, ricin toxin, cholera toxin, shiga-like toxin, LT toxin, C3 toxin, shiga toxin, pertussis toxin, tetanus toxin, soybean Bowman-Birk protease inhibitor, Pseudomonas exotoxin, alorin, fucoside, capsidin, gelanin, phaseolus toxin chain A, capsidin chain A, alpha-bromotoxin, oleuropein, staphylin protein, American commercial protein, bitter melon inhibitor, jatropha toxin, croton toxin, soapwort inhibitor, white tree toxin, mitogellin, limiting trichothecene, phenomycin and enoxycin Toxins; Ribonuclease (RNase) ; DNase I, staphylococcal endotoxin A; American commercial land antiviral protein; diphtheria toxin; and Pseudomonas endotoxin.In some embodiments, the microtubulin inhibitor can be medensin I or an analogue or derivative thereof; the antimetabolite is aminopterin, 6-mercaptopurine, 6-thioguanine, cytarabine, fludarabine, 5-fluorouracil, dacarbazine, hydroxyurea, asparaginase, gemcitabine or cladribine; the alkylating agent is azacitidine, thiophan, azacitidine benzoate, melphalan, carazacitidine (BSNU) , lomustine (CCNU) , cyclophosphamide, leucovorin, dibromomannan, streptozotocin, dacarbazine (DTIC) , procarbazine, mitomycin C, cis-molybdenum, carbomolybdenum, duocarmycin A, duocarmycin SA, rachamycin (CC-1065) or analogues or derivatives thereof; the antibiotics being bleomycin, adriamycin, idarubicin (or mitomycin, mitoxantrone, puccamycin, antrixin (AMC) ) ; the antimitotic agent is monomethyl auristatin E or F; the diphtheria toxin-related molecule is diphtheria A chain; the ricin toxin is ricin A or deglycosylated ricin A chain toxin; the shiga-like toxin is SLT I, SLT II and SLT IIV; the American commercial protein is PAPI, PAPII and PAP S.In some embodiments, the radionuclide comprises: At211, I131, I125, I123, Y90, Re186, Re188, Sm153, Bi212, P32, Pb212, Tc99, S35, F19, N15, C14, C13 or H3, optionally the radionuclide can be conjugated to the antibody via a chelating agent.In some embodiments, the cytokine comprises: IL-2, IL-4, IL-6, IL-7, IL-10, IL-12, IL-13, IL-15, IL-18, IL-23, IL-24, IL-27, IL-28a, IL-28b, IL-29, KGF IFNα, IFNβ, IFNγ, GM-CSF, CD40L, Flt3 ligand, stem cell factor, anisidine or TNFα.Anti-CDH17 Antibody Drug ConjugateAn exemplary immunoconjugate of the present disclosure is an antibody-drug conjugate, and the active agent is a drug moiety, wherein the antibody drug conjugate has a formula of Ab- (L- (D) m) n, wherein Ab is the antibody or an antigen binding fragment thereof as described herein; L is a linker; D is the drug moiety; m is an integer from 1 to 8; and n is any number from 1 to 10.The anti-CDH17 antibody of present application can be conjugated to a drug via a linker structure moiety to prepare an anti-CDH17 antibody drug conjugate. The drug is not particularly limited as long as it has a substituent or a partial structure that can be connected to a linker structure. The anti-CDH17 antibody drug conjugate can be used for various purposes according to the conjugated drug. Examples of such a drug can include substances having antitumor activity, substances effective for blood diseases, substances effective for autoimmune diseases, anti-inflammatory substances, antimicrobial substances, antifungal substances, antiparasitic substances, antiviral substances, and anti-anesthetic substances.Cytotoxic AgentAs described above, the drug moiety for an antibody-drug conjugate of the present disclosure can be selected from the group consisting of a cytotoxic agent, a cytokine, a nucleic acid, a nucleic acid-associated molecule, a radionuclide, a chemokine, an immuno (co) -stimulatory molecule, an immunosuppressive molecule, a death ligand, an apoptosis-inducing protein, a kinase, a prodrug-converting enzyme, a RNase, an agonistic antibody or antibody fragment, an antagonistic antibody or antibody fragment, a growth factor, a hormone, a coagulation factor, a fibrinolytic protein, peptides mimicking these, and fragments, fusion proteins and derivatives thereof.An example using a cytotoxic agent as a compound to be conjugated in the anti-CDH17 antibody drug conjugate of the present invention will be described below. The cytotoxic agent is not particularly limited as long as the compound has an antitumor effect and has a substituent or a partial structure that can be connected to a linker structure. Upon cleavage of a part or the whole of the linker in tumor cells, the cytotoxic agent is released so that the cytotoxic agent exhibits an antitumor effect. As the linker is cleaved at a connecting position with the drug, the cytotoxic agent is released in its original structure to exert its original antitumor effect.In some embodiments, the cytotoxic agent comprises a tubulin inhibitor and / or a topoisomerase inhibitor. For example, the cytotoxic agent can comprise: monomethyl auristatin E (MMAE) , monomethyl auristatin F (MMAF) , medensin I, pyrrolobenzodiazepine (PBD) , camptothecin, nemorubicin, PNU-159682, anthracyclines, betacamycin, perillyl alkaloids, paclitaxel, montelukast, elinafide, kallikrein, duocarmycin, rachamycin (CC-1065) or an analogue, a derivative or a prodrug thereof.In some embodiments, the cytotoxic agent comprises a topoisomerase I inhibitor. For example, the cytotoxic agent can comprise camptothecin (CPT) or a derivative thereof.As a non-restricted example, the camptothecin can comprise camptothecin and camptothecin derivatives including but not limited to irinotecan, topotecan, lurtotecan, silatecan, etirinotecan pegol, TAS 103, 9-aminocamptothecin, 7-ethylcamptothecin, 10-hydroxycamptothecin, 9-nitrocamptothecin, 10, 11-methylenedioxycamptothecin, 9-amino-10, 11-methylenedioxycamptothecin, 9-chloro-10, 11-methylenedioxycamptothecin, 7- (4-methylpiperazinomethylene) -10, 1 1-ethylenedioxy-20 (S) -camptothecin, 7- (4-methylpiperazinomethylene) -10, 1 1-methylenedioxy-20 (S) -camptothecin, and 7- (2-N-isopropylamino) ethyl) - (20S) -camptothecin, and stereoisomers, salts and esters thereof.As one example of the cytotoxic agent used in the present invention, exatecan, a camptothecin derivative ( (1S, 9S) -1-amino-9-ethyl-5-fluoro-2, 3-dihydro-9-hydroxy-4-methyl-1H, 12H-benzo [de] pyrano [3’ , 4’ : 6, 7] indolizino [1, 2-b] quinoline-10, 13 (9H, 15H) -dione represented by the following formula) can preferably be used.Formula 2’Exatecan can be easily obtained by, for example, a method described in U.S. Patent Publication No. US2016 / 0297890 or other known methods, and the amino group at position 1 can be preferably used as a connecting position to a linker structure.Since exatecan has a camptothecin structure, it is known that the equilibrium shifts to a structure with a formed lactone ring (closed ring) in an acidic aqueous medium (e.g., of the order of pH 3) whereas the equilibrium shifts to a structure with an opened lactone ring (open ring) in a basic aqueous medium (e.g., of the order of pH 10) . Formula 2’ as discussed herein includes a tautomer, mesomer, racemate, enantiomer, or diastereomer thereof, or mixtures thereof, or a pharmaceutically acceptable salt or a solvate thereof. A drug conjugate into which exatecan residues corresponding to such a closed ring structure and / or an open ring structure have been introduced is also expected to have an equivalent antitumor effect, and it is needless to say that any of such drug conjugate is included within the scope of the present invention.Other examples of the cytotoxic agent can include cytotoxic agents described in the literature (Pharmacological Reviews, 68, p. 3-19, 2016) . Specific examples thereof can include doxorubicin, calicheamicin, dolastatin 10, auristatins such as monomethyl auristatin E (MMAE) and monomethyl auristatin F (MMAF) , maytansinoids such as DM1 and DM4, a pyrrolobenzodiazepine dimer SG2000 (SJG-136) , a camptothecin derivative SN-38, duocarmycins such as CC-1065, amanitin, daunorubicin, mitomycin C, bleomycin, cyclocytidine, vincristine, vinblastine, methotrexate, platinum-based antitumor agents (cisplatin and derivatives thereof) , and Taxol and derivatives thereof.In the antibody drug conjugate, the number of conjugated drug molecules per antibody molecule is a key factor having an influence on the efficacy and safety thereof. The production of the antibody drug conjugate is carried out by specifying reaction conditions such as the amounts of starting materials and reagents used for reaction, so as to attain a constant number of conjugated drug molecules. Unlike the chemical reaction of a low-molecular-weight compound, a mixture containing different numbers of conjugated drug molecules is usually obtained. The number of conjugated drug molecules per antibody molecule is defined and indicated as an average value, i.e., the average number of conjugated drug molecules. Unless otherwise specified, i.e., except in the case of representing an antibody drug conjugate having a specific number of conjugated drug molecules that is included in an antibody drug conjugate mixture having different numbers of conjugated drug molecules, the number of conjugated drug molecules according to the present invention also means an average value as a rule. The number of exatecan molecules conjugated to an antibody molecule is controllable, and as an average number of conjugated drug molecules per antibody, approximately 1 to 10 exatecan molecules can be conjugated. The number of exatecan molecules is preferably 2 to 8, 3 to 8, 4 to 8, 5 to 8, 6 to 8 or 7 to 8, more preferably 5 to 8, further preferably 7 to 8, still further preferably 8. It is to be noted that a person skilled in the art can design a reaction for conjugating a required number of drug molecules to an antibody molecule based on the description of Examples of the present application, and can obtain an antibody drug conjugate with a controlled number of conjugated exatecan molecules.Linker StructureThe linker structure which conjugates a drug moiety to the anti-CDH17 antibody in the anti-CDH17 antibody-drug conjugate of the present invention will be described. In the antibody-drug conjugate of the present application, the linker structure which conjugates the anti-CDH17 antibody to the drug is not particularly limited as long as the resulting antibody-drug conjugate can be used. The linker structure may be appropriately selected and used according to the purpose of use. One example of the linker structure can include a linker described in known literature (Pharmacol Rev 68: 3-19, January 2016, Protein Cell DOI 10.1007 / s13238-016-0323-0, etc. ) .Any linker structure given below can preferably be used. It is to be noted that the left terminus of the structure is a connecting position to the antibody, and the right terminus thereof is a connecting position to the drug. Furthermore, VA in the linker structures given below represents an amino acid sequence consisting of valine-alanine (VA) linked through peptide bonds, and GGFG in the linker structures given below represents an amino acid sequence consisting of glycine-glycine-phenylalanine-glycine (GGFG) linked through peptide bonds.- (succinimidyl-3-yl-N) -CH2CH2-C (=O) -GGFG-PABC-;- (succinimidyl-3-yl-N) -CH2CH2CH2CH2CH2-C (=O) -GGFG-PABC-;- (succinimidyl-3-yl-N) -CH2CH2CH2CH2CH2-C (=O) -GGFG-NH-PABC-;- (succinimidyl-3-yl-N) -CH2CH2-C (=O) -NH-CH2CH2O-CH2CH2O-CH2CH2-C (=O) -GGFG-PABC-;- (succinimidyl-3-yl-N) -CH2CH2-C (=O) -NH-CH2CH2O-CH2CH2O-CH2CH2O-CH2CH2O-CH2CH2-C (=O) -GGFG-PABC-;-CH2-C (=O) -NH-CH2CH2-C (=O) -GGFG-PABC-;-C (=O) -CH2CH2CH2CH2CH2CH2-C (=O) -GGFG-PABC-;- (succinimidyl-3-yl-N) -CH2CH2-C (=O) -GGFG-NH-CH2CH2-C (=O) -;- (succinimidyl-3-yl-N) -CH2CH2-C (=O) -GGFG-NH-CH2CH2CH2-C (=O) -;- (succinimidyl-3-yl-N) -CH2CH2CH2CH2CH2-C (=O) -GGFG-NH-CH2CH2-C (=O) -;- (succinimidyl-3-yl-N) -CH2CH2CH2CH2CH2-C (=O) -GGFG-NH-CH2CH2CH2-C (=O) -;- (succinimidyl-3-yl-N) -CH2CH2CH2CH2CH2-C (=O) -GGFG-NH-CH2CH2CH2CH2CH2-C (=O) -;- (succinimidyl-3-yl-N) -CH2CH2CH2CH2CH2-C (=O) -GGFG-NH-CH2-O-CH2-C (=O) -;- (succinimidyl-3-yl-N) -CH2CH2CH2CH2CH2-C (=O) -GGFG-NH-CH2CH2-O-CH2-C (=O) -;- (succinimidyl-3-yl-N) -CH2CH2-C (=O) -NH-CH2CH2O-CH2CH2O-CH2CH2-C (=O) -GGFG-NH-CH2CH2CH2-C (=O) -;- (succinimidyl-3-yl-N) -CH2CH2-C (=O) -NH-CH2CH2O-CH2CH2O-CH2CH2-C (=O) -GGFG-NH-CH2CH2-C (=O) -;- (succinimidyl-3-yl-N) -CH2CH2-C (=O) -NH-CH2CH2O-CH2CH2O-CH2CH2O-CH2CH2O-CH2CH2-C (=O) -GGFG-NH-CH2CH2CH2-C (=O) -;- (succinimidyl-3-yl-N) -CH2CH2-C (=O) -NH-CH2CH2O-CH2CH2O-CH2CH2O-CH2CH2O-CH2CH2-C (=O) -GGFG-NH-CH2CH2-C (=O) -;-CH2-C (=O) -NH-CH2CH2-C (=O) -GGFG-NH-CH2CH2CH2-C (=O) -;-C (=O) -CH2CH2CH2CH2CH2CH2-C (=O) -GGFG-NH-CH2CH2CH2-C (=O) -;- (succinimidyl-3-yl-N) -CH2CH2-C (=O) -VA-PABC-;- (succinimidyl-3-yl-N) -CH2CH2CH2CH2CH2-C (=O) -VA-PABC-;- (succinimidyl-3-yl-N) -CH2CH2CH2CH2CH2-C (=O) -VA-NH-PABC-;- (succinimidyl-3-yl-N) -CH2CH2-C (=O) -NH-CH2CH2O-CH2CH2O-CH2CH2-C (=O) -VA-PABC-;- (succinimidyl-3-yl-N) -CH2CH2-C (=O) -NH-CH2CH2o-CH2CH2O-CH2CH2O-CH2CH2O-CH2CH2-C (=O) -VA-PABC-;-CH2-C (=O) -NH-CH2CH2-C (=O) -VA-PABC-;-C (=O) -CH2CH2CH2CH2CH2CH2-C (=O) -VA-PABC-;- (succinimidyl-3-yl-N) -CH2CH2-C (=O) -VA-NH-CH2CH2-C (=O) -;- (succinimidyl-3-yl-N) -CH2CH2-C (=O) -VA-NH-CH2CH2CH2-C (=O) -;- (succinimidyl-3-yl-N) -CH2CH2CH2CH2CH2-C (=O) -VA-NH-CH2CH2-C (=O) -;- (succinimidyl-3-yl-N) -CH2CH2CH2CH2CH2-C (=O) -VA-NH-CH2CH2CH2-C (=O) -;- (succinimidyl-3-yl-N) -CH2CH2CH2CH2CH2-C (=O) -VA-NH-CH2CH2CH2CH2CH2-C (=O) -;- (succinimidyl-3-yl-N) -CH2CH2CH2CH2CH2-C (=O) -VA-NH-CH2-O-CH2-C (=O) -;- (succinimidyl-3-yl-N) -CH2CH2CH2CH2CH2-C (=O) -VA-NH-CH2CH2-O-CH2-C (=O) -;- (succinimidyl-3-yl-N) -CH2CH2-C (=O) -NH-CH2CH2O-CH2CH2O-CH2CH2-C (=O) -VA-NH-CH2CH2CH2-C (=O) -;- (succinimidyl-3-yl-N) -CH2CH2-C (=O) -NH-CH2CH2O-CH2CH2O-CH2CH2-C (=O) -VA-NH-CH2CH2-C (=O) -;- (succinimidyl-3-yl-N) -CH2CH2-C (=O) -NH-CH2CH2O-CH2CH2O-CH2CH2O-CH2CH2O-CH2CH2-C (=O) -VA-NH-CH2CH2CH2-C (=O) -;- (succinimidyl-3-yl-N) -CH2CH2-C (=O) -NH-CH2CH2O-CH2CH2O-CH2CH2O-CH2CH2O-CH2CH2-C (=O) -VA-NH-CH2CH2-C (=O) -;-CH2-C (=O) -NH-CH2CH2-C (=O) -VA-NH-CH2CH2CH2-C (=O) -; and-C (=O) -CH2CH2CH2CH2CH2CH2-C (=O) -VA-NH-CH2CH2CH2-C (=O) -.In some embodiments, the spacer comprises self-immolative spacers. For example, the self-immolative spacer can comprise p-aminobenzoxy carbonyl (PABC) or p-aminobenzyl (PAB) .In some embodiments, the cleavable peptide can be directly spliced to the spacer.In some embodiments, the L can comprise: -Val‐Cit-PABC-, -Val‐Ala-PABC-, -Glu‐Val‐Cit‐PABC-, -Ala‐Ala‐Asn‐PABC-, -Gly-Val-Cit‐PABC-, -Gly-Gly-Gly‐PABC-, -Gly-Gly-Phe-Gly-PABC-, -Val‐Cit-PAB-, -Val‐Ala-PAB-, -Glu‐Val‐Cit‐PAB-, -Ala‐Ala‐Asn‐PAB-, -Gly-Val-Cit‐PAB-, -Gly-Gly-Gly‐PAB-or -Gly-Gly-Phe-Gly-PAB-.For example, the L can be selected from the following structure:In some embodiments, the p-aminobenzoxy carbonyl (PABC) or p-aminobenzyl (PAB) comprises a polysarcosine (poly-N-methylglycine) residue.In some embodiments, the L is selected from the following structure:wherein n5 denotes an integer from 0 to 20, optionally the n5 can denote an integer from 1 to 15.For example, the n5 can be 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 or 20.For example, the n5 can be denote an integer from 1 to 20, 1 to 19, 1 to 18, 1 to 17, 1 to 16, 1 to 15, 1 to 14, 1 to 13, 1 to 12, 1 to 11, 1 to 10, 1 to 9, 1 to 8, 1 to 7, 1 to 6, 1 to 5, 1 to 4, 1 to 3, 1 to 2, 2 to 20, 2 to 19, 2 to 18, 2 to 17, 2 to 16, 2 to 15, 2 to 14, 2 to 13, 2 to 12, 2 to 11, 2 to 10, 2 to 9, 2 to 8, 2 to 7, 2 to 6, 2 to 5, 2 to 4, 2 to 3, 3 to 20, 3 to 19, 3 to 18, 3 to 17, 3 to 16, 3 to 15, 3 to 14, 3 to 13, 3 to 12, 3 to 11, 3 to 10, 3 to 9, 3 to 8, 3 to 7, 3 to 6, 3 to 5, 3 to 4, 4 to 20, 4 to 19, 4 to 18, 4 to 17, 4 to 16, 4 to 15, 4 to 14, 4 to 13, 4 to 12, 4 to 11, 4 to 10, 4 to 9, 4 to 8, 4 to 7, 4 to 6, 4 to 5, 5 to 20, 5 to 19, 5 to 18, 5 to 17, 5 to 16, 5 to 15, 5 to 14, 5 to 13, 5 to 12, 5 to 11, 5 to 10, 5 to 9, 5 to 8, 5 to 7, 5 to 6, 6 to 20, 6 to 19, 6 to 18, 6 to 17, 6 to 16, 6 to 15, 6 to 14, 6 to 13, 6 to 12, 6 to 11, 6 to 10, 6 to 9, 6 to 8, 6 to 7, 7 to 20, 7 to 19, 7 to 18, 7 to 17, 7 to 16, 7 to 15, 7 to 14, 7 to 13, 7 to 12, 7 to 11, 7 to 10, 7 to 9, 7 to 8, 8 to 20, 8 to 19, 8 to 18, 8 to 17, 8 to 16, 8 to 15, 8 to 14, 8 to 13, 8 to 12, 8 to 11, 8 to 10, 8 to 9, 9 to 20, 9 to 19, 9 to 18, 9 to 17, 9 to 16, 9 to 15, 9 to 14, 9 to 13, 9 to 12, 9 to 11, 9 to 10, 10 to 20, 10 to 19, 10 to 18, 10 to 17, 10 to 16, 10 to 15, 10 to 14, 10 to 13, 10 to 12 or 10 to 11.For example, the n5 can be denote an integer from 1 to 7. For example, the n5 can be denote an integer from 8 to 15.For example, the L can be selected from the following structure:The antibody drug conjugate can be produced by reacting the compound obtainable by a known method (e.g., obtainable by a method described in the patent publication literature US2016 / 297890 (e.g., obtainable by a method described in the paragraphs
[0336] to
[0374] ) ) , with the antibody having a sulfhydryl group. The antibody having a sulfhydryl group can be obtained by a method well known to a person skilled in the art (Hermanson, G. T, Bioconjugate Techniques, pp. 56-136, pp. 456-493, Academic Press (1996) ) .One specific example of the antibody-drug conjugate of the present invention can include an antibody-drug conjugate having a structure represented by the following formula:wherein n can be any number from 1 to 10. For example, the n can be any number from 1 to 9.5, 1 to 9, 1 to 8.5, 1 to 8, 1 to 7.5, 1 to 7, 1 to 6.5, 1 to 6, 1 to 5.5, 1 to 5, 1 to 4.5, 1 to 4, 1 to 3.5, 1 to 3, 1 to 2.5, 1 to 2, 1 to 1.5, 1.5 to 9.5, 1.5 to 9, 1.5 to 8.5, 1.5 to 8, 1.5 to 7.5, 1.5 to 7, 1.5 to 6.5, 1.5 to 6, 1.5 to 5.5, 1.5 to 5, 1.5 to 4.5, 1.5 to 4, 1.5 to 3.5, 1.5 to 3, 1.5 to 2.5, 1.5 to 2, 2 to 9.5, 2 to 9, 2 to 8.5, 2 to 8, 2 to 7.5, 2 to 7, 2 to 6.5, 2 to 6, 2 to 5.5, 2 to 5, 2 to 4.5, 2 to 4, 2 to 3.5, 2 to 3, 2 to 2.5, 2.5 to 9.5, 2.5 to 9, 2.5 to 8.5, 2.5 to 8, 2.5 to 7.5, 2.5 to 7, 2.5 to 6.5, 2.5 to 6, 2.5 to 5.5, 2.5 to 5, 2.5 to 4.5, 2.5 to 4, 2.5 to 3.5, 2.5 to 3, 3 to 9.5, 3 to 9, 3 to 8.5, 3 to 8, 3 to 7.5, 3 to 7, 3 to 6.5, 3 to 6, 3 to 5.5, 3 to 5, 3 to 4.5, 3 to 4, 3 to 3.5, 3.5 to 9.5, 3.5 to 9, 3.5 to 8.5, 3.5 to 8, 3.5 to 7.5, 3.5 to 7, 3.5 to 6.5, 3.5 to 6, 3.5 to 5.5, 3.5 to 5, 3.5 to 4.5, 3.5 to 4, 4 to 9.5, 4 to 9, 4 to 8.5, 4 to 8, 4 to 7.5, 4 to 7, 4 to 6.5, 4 to 6, 4 to 5.5, 4 to 5, 4 to 4.5, 4.5 to 9.5, 4.5 to 9, 4.5 to 8.5, 4.5 to 8, 4.5 to 7.5, 4.5 to 7, 4.5 to 6.5, 4.5 to 6, 4.5 to 5.5, 4.5 to 5, 5 to 9.5, 5 to 9, 5 to 8.5, 5 to 8, 5 to 7.5, 5 to 7, 5 to 6.5, 5 to 6, 5 to 5.5, 5.5 to 9.5, 5.5 to 9, 5.5 to 8.5, 5.5 to 8, 5.5 to 7.5, 5.5 to 7, 5.5 to 6.5, 5.5 to 6, 6 to 9.5, 6 to 9, 6 to 8.5, 6 to 8, 6 to 7.5, 6 to 7, 6 to 6.5, 6.5 to 9.5, 6.5 to 9, 6.5 to 8.5, 6.5 to 8, 6.5 to 7.5, 6.5 to 7, 7 to 9.5, 7 to 9, 7 to 8.5, 7 to 8, 7 to 7.5, 7.5 to 9.5, 7.5 to 9, 7.5 to 8.5, 7.5 to 8, 8 to 9.5, 8 to 9, 8 to 8.5, 8.5 to 9.5, or 8.5 to 9.In this context, Ab represents the anti-CDH17 antibody disclosed in the present description, and the antibody is conjugated to the linker-payload via a sulfhydryl group stemming from the antibody. In this context, n has the same meaning as that of the so-called DAR (drug-to-antibody Ratio) , and represents a drug-to-antibody ratio per antibody. Specifically, n represents the number of conjugated drug molecules per antibody molecule, which is a numeric value defined and indicated as an average value, i.e., the average number of conjugated drug molecules. In the present invention, n can be 2 to 8 and is preferably 5 to 8, more preferably 7 to 8, and still more preferably 8, in measurement by common procedure F.In some embodiments, provided is an anti-CDH17 antibody-drug conjugate, having a formula of Ab- (L- (D) m) n, wherein L is a linker; D is the drug moiety; m is an integer from 1 to 8; n is any number from 1 to 10; and Ab is an antibody or an antigen binding fragment thereof binding specifically to a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128 or in SEQ ID NO: 166.In some embodiments, provided is an anti-CDH17 antibody-drug conjugate, having a formula of Ab- (L- (D) m) n, wherein L is a linker; D is the drug moiety; m is an integer from 1 to 8; n is any number from 1 to 10; and Ab is an antibody having competitive binding activity with the polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128 or in SEQ ID NO: 166 against an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence selected from a group consisting of SEQ ID NO: 1, 3, 5, 19, 21, 23, 25, 27, 37, 39, 41, 170, 174, and an amino acid sequence having at least 80%sequence identity to each thereof, and a light chain variable region having an amino acid sequence selected from a group consisting of SEQ ID NO: 2, 4, 6, 29, 31, 33, 35, 43, 45, 47, 172, 176, and an amino acid sequence having at least 80%sequence identity to each thereof.In some embodiments, provided is an anti-CDH17 antibody-drug conjugate, having a formula of Ab- (L- (D) m) n, wherein L is a linker; D is the drug moiety; m is an integer from 1 to 8; n is any number from 1 to 10; and Ab is an antibody having competitive binding activity with the polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128 or in SEQ ID NO: 166 against an anti-CDH17 antibody selected from a group consisting of:an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 1 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 1, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 2 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 2;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 3 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 3, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 4 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 4;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 5 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 5, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 6 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 6;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 19 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 19, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 29 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 29;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 21 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 21, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 31 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 31;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 23 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 23, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 33 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 33;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 19 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 19, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 35 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 35;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 25 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 25, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 35 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 35;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 27 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 27, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 35 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 35;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 37 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 37, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 43 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 43;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 39 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 39, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 45 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 45;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 41 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 41, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 47 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 47;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 170 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 170, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 172 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 172; andan anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 174 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 174, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 176 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 176.In some embodiments, provided is an anti-CDH17 antibody-drug conjugate, having a formula of Ab- (L- (D) m) n, wherein L is a linker; D is the drug moiety; m is an integer from 1 to 8; n is any number from 1 to 10; and Ab is an antibody having competitive binding activity with the polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128 or in SEQ ID NO: 166 against an anti-CDH17 antibody selected from a group consisting of:an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 7 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 7, and a light chain having an amino acid sequence shown in SEQ ID NO: 8 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 8;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 9 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 9, and a light chain having an amino acid sequence shown in SEQ ID NO: 10 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 10;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 11 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 11, and a light chain having an amino acid sequence shown in SEQ ID NO: 12 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 12;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 20 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 20, and a light chain having an amino acid sequence shown in SEQ ID NO: 30 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 30;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 22 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 22, and a light chain having an amino acid sequence shown in SEQ ID NO: 32 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 32;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 24 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 24, and a light chain having an amino acid sequence shown in SEQ ID NO: 34 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 34;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 20 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 20, and a light chain having an amino acid sequence shown in SEQ ID NO: 36 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 36;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 26 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 26, and a light chain having an amino acid sequence shown in SEQ ID NO: 36 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 36;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 28 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 28, and a light chain having an amino acid sequence shown in SEQ ID NO: 36 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 36;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 38 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 38, and a light chain having an amino acid sequence shown in SEQ ID NO: 44 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 44;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 40 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 40, and a light chain having an amino acid sequence shown in SEQ ID NO: 46 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 46;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 42 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 42, and a light chain having an amino acid sequence shown in SEQ ID NO: 48 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 48;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 171 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 171, and a light chain having an amino acid sequence shown in SEQ ID NO: 173 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 173; andan anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 175 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 175, and a light chain having an amino acid sequence shown in SEQ ID NO: 177 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 177.In any of the anti-CDH17 antibody-drug conjugate described herein, the heavy chain or the light chain may comprise one or two or more modifications selected from the group consisting of posttranslational modifications typified by N-linked glycosylation, O-linked glycosylation, N-terminal processing, C-terminal processing, deamidation, isomerization of aspartic acid, oxidation of methionine, addition of a methionine residue to the N-terminus, amidation of a proline residue, and conversion of N-terminal glutamine or N-terminal glutamic acid to pyroglutamic acid, and a deletion of one or two amino acids at the carboxyl terminus.In some embodiments, provided is an anti-CDH17 antibody-drug conjugate, having a formula of Ab- (L- (D) m) n, wherein L is a linker; D is the drug moiety; m is an integer from 1 to 8; n is any number from 1 to 10; and Ab is an anti-CDH17 antibody comprising a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 which are same as the HCDR1, HCDR2, and HCDR3 of a heavy chain variable region having an amino acid sequence selected from a group consisting of SEQ ID NO: 1, 3, 5, 19, 21, 23, 25, 27, 37, 39, 41, 170, and 174, and / or a light chain variable region comprising LCDR1, LCDR2, and LCDR3 which are same as the LCDR1, LCDR2, and LCDR3 of a light chain variable region having an amino acid sequence selected from a group consisting of SEQ ID NO: 2, 4, 6, 29, 31, 33, 35, 43, 45, 47, 172, and 176.In some embodiments, provided is an anti-CDH17 antibody-drug conjugate, having a formula of Ab- (L- (D) m) n, wherein L is a linker; D is the drug moiety; m is an integer from 1 to 8; n is any number from 1 to 10; and Ab is an anti-CDH17 antibody comprising a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 which are same as the HCDR1, HCDR2, and HCDR3 of a heavy chain variable region having an amino acid sequence selected from a group consisting of SEQ ID NO: 1, 3, 5, 19, 21, 23, 25, 27, 37, 39, 41, 170, and 174, and / or a light chain variable region comprising LCDR1, LCDR2, and LCDR3 which are same as the LCDR1, LCDR2, and LCDR3 of a light chain variable region having an amino acid sequence selected from a group consisting of SEQ ID NO: 2, 4, 6, 29, 31, 33, 35, 43, 45, 47, 172, and 176; wherein the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 are defined according to any one of CDR definition schemes selected from a group consisting of IMGT, Kabat, Contact, Chothia, Martin, PyIgClassify, and any combination thereof; preferably, the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 are defined according to any one of CDR definition schemes selected from a group consisting of IMGT, Kabat, Contact, Chothia, and any combination thereof.In some embodiments, provided is an anti-CDH17 antibody-drug conjugate, having a formula of Ab- (L- (D) m) n, wherein L is a linker; D is the drug moiety; m is an integer from 1 to 8; n is any number from 1 to 10; and Ab is an antibody comprising a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 having amino acid sequences selected from a group consisting of:SEQ ID NO: 49, 50, and 51, respectively;SEQ ID NO: 68, 69, and 70, respectively;SEQ ID NO: 87, 88, and 89, respectively;SEQ ID NO: 109, 50, and 51, respectively;SEQ ID NO: 49, 50, and 113, respectively;SEQ ID NO: 49, 50, and 116, respectively;SEQ ID NO: 178, 179, and 180, respectively; andSEQ ID NO: 191, 192, and 193, respectivelyaccording to IMGT definition scheme; or a group consisting of:SEQ ID NO: 55, 56, and 57, respectively;SEQ ID NO: 74, 75, and 76, respectively;SEQ ID NO: 93, 94, and 95, respectively;SEQ ID NO: 55, 106, and 57, respectively;SEQ ID NO: 110, 111, and 57, respectively;SEQ ID NO: 55, 106, and 114, respectively;SEQ ID NO: 55, 106, and 117, respectively;SEQ ID NO: 182, 183, and 184, respectively; andSEQ ID NO: 197, 198, and 199, respectively;according to Kabat definition scheme; or a group consisting of:SEQ ID NO: 60, 61, and 57, respectively;SEQ ID NO: 79, 80, and 76, respectively;SEQ ID NO: 98, 99, and 95, respectively;SEQ ID NO: 60, 61, and 114, respectively;SEQ ID NO: 60, 61, and 117, respectively;SEQ ID NO: 185, 186, and 184, respectively; andSEQ ID NO: 202, 203, and 199, respectively;according to Chothia definition scheme; or a group consisting of:SEQ ID NO: 62, 63, and 64, respectively;SEQ ID NO: 81, 82, and 83, respectively;SEQ ID NO: 100, 101, and 102, respectively;SEQ ID NO: 62, 107, and 64, respectively;SEQ ID NO: 62, 108, and 57, respectively;SEQ ID NO: 112, 108, and 64, respectively;SEQ ID NO: 62, 107, and 115, respectively;SEQ ID NO: 62, 107, and 118, respectively;SEQ ID NO: 81, 123, and 83, respectively;SEQ ID NO: 187, 188, and 189, respectively; andSEQ ID NO: 204, 205, and 206, respectively;according to Contact definition scheme;and / or a light chain variable region comprising LCDR1, LCDR2, and LCDR3 having amino acid sequences selected from a group consisting of:SEQ ID NO: 52, 53, and 54, respectively;SEQ ID NO: 71, 72, and 73, respectively;SEQ ID NO: 90, 91, and 92, respectively;SEQ ID NO: 52, 53, and 181, respectively; andSEQ ID NO: 194, 195, and 196, respectivelyaccording to IMGT definition scheme; or a group consisting of:SEQ ID NO: 58, 59, and 54, respectively;SEQ ID NO: 77, 78, and 73, respectively;SEQ ID NO: 96, 97, and 92, respectively;SEQ ID NO: 58, 120, and 54, respectively;SEQ ID NO: 58, 59, and 181, respectively; andSEQ ID NO: 200, 201, and 196, respectively;according to Kabat definition scheme; or a group consisting of:SEQ ID NO: 65, 66, and 67, respectively;SEQ ID NO: 84, 85, and 86, respectively;SEQ ID NO: 103, 104, and 105, respectively;SEQ ID NO: 65, 119, and 67, respectively;SEQ ID NO: 65, 121, and 67, respectively;SEQ ID NO: 65, 122, and 67, respectively;SEQ ID NO: 65, 66, and 190, respectively; andSEQ ID NO: 207, 208, and 209, respectively;according to Contact definition scheme.In some embodiments, provided is an anti-CDH17 antibody-drug conjugate, having a formula of Ab- (L- (D) m) n, wherein L is a linker; D is the drug moiety; m is an integer from 1 to 8; n is any number from 1 to 10; and Ab is an antibody comprising a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 and a light chain variable region comprising LCDR1, LCDR2, and LCDR3, wherein the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 have amino acid sequences selected from a group consisting of:SEQ ID NO: 49, 50, 51, 52, 53, and 54, respectively;SEQ ID NO: 68, 69, 70, 71, 72, and 73, respectively;SEQ ID NO: 87, 88, 89, 90, 91, and 92, respectively;SEQ ID NO: 109, 50, 51, 52, 53, and 54, respectively;SEQ ID NO: 49, 50, 113, 52, 53, and 54, respectively;SEQ ID NO: 49, 50, 116, 52, 53, and 54, respectively;SEQ ID NO: 178, 179, 180, 52, 53, and 181, respectively; andSEQ ID NO: 191, 192, 193, 194, 195, and 196, respectively;according to IMGT definition scheme; or a group consisting of:SEQ ID NO: 55, 56, 57, 58, 59, and 54, respectively;SEQ ID NO: 74, 75, 76, 77, 78, and 73, respectively;SEQ ID NO: 93, 94, 95, 96, 97, and 92, respectively;SEQ ID NO: 55, 106, 57, 58, 59, and 54, respectively;SEQ ID NO: 110, 111, 57, 58, 120, and 54, respectively;SEQ ID NO: 55, 106, 57, 58, 120, and 54, respectively;SEQ ID NO: 55, 106, 114, 58, 120, and 54, respectively;SEQ ID NO: 55, 106, 117, 58, 120, and 54, respectively;SEQ ID NO: 182, 183, 184, 58, 59, and 181, respectively; andSEQ ID NO: 197, 198, 199, 200, 201, and 196, respectively;according to Kabat definition scheme; or a group consisting of:SEQ ID NO: 60, 61, 57, 58, 59, and 54, respectively;SEQ ID NO: 79, 80, 76, 77, 78, and 73, respectively;SEQ ID NO: 98, 99, 95, 96, 97, and 92, respectively;SEQ ID NO: 60, 61, 57, 58, 120, and 54, respectivelySEQ ID NO: 60, 61, 114, 58, 120, and 54, respectively;SEQ ID NO: 60, 61, 117, 58, 120, and 54, respectively;SEQ ID NO: 185, 186, 184, 58, 59, and 181, respectively; andSEQ ID NO: 202, 203, 199, 200, 201, and 196, respectively;according to Chothia definition scheme; or a group consisting of:SEQ ID NO: 62, 63, 64, 65, 66, and 67, respectively;SEQ ID NO: 81, 82, 83, 84, 85, and 86, respectively;SEQ ID NO: 100, 101, 102, 103, 104, and 105, respectively;SEQ ID NO: 62, 107, 64, 65, 119, and 67, respectively;SEQ ID NO: 62, 108, 57, 65, 66, and 67, respectively;SEQ ID NO: 112, 108, 64, 65, 121, and 67, respectively;SEQ ID NO: 62, 107, 115, 65, 122, and 67, respectively;SEQ ID NO: 62, 107, 118, 65, 122, and 67, respectively;SEQ ID NO: 62, 107, 64, 65, 122, and 67, respectively;SEQ ID NO: 81, 123, 83, 84, 85, and 86, respectively;SEQ ID NO: 187, 188, 189, 65, 66, and 190, respectively; andSEQ ID NO: 204, 205, 206, 207, 208, and 209, respectively;according to Contact definition scheme.In some embodiments, provided is an anti-CDH17 antibody-drug conjugate, having a formula of Ab- (L- (D) m) n, wherein Ab is an antibody comprising a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 and a light chain variable region comprising LCDR1, LCDR2, and LCDR3, wherein the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 have amino acid sequences selected from a group consisting of:SEQ ID NO: 49, 50, 51, 52, 53, and 54, respectively;SEQ ID NO: 68, 69, 70, 71, 72, and 73, respectively;SEQ ID NO: 87, 88, 89, 90, 91, and 92, respectively;SEQ ID NO: 109, 50, 51, 52, 53, and 54, respectively;SEQ ID NO: 49, 50, 113, 52, 53, and 54, respectively;SEQ ID NO: 49, 50, 116, 52, 53, and 54, respectively;SEQ ID NO: 178, 179, 180, 52, 53, and 181, respectively; andSEQ ID NO: 191, 192, 193, 194, 195, and 196, respectively;according to IMGT definition scheme; or a group consisting of:SEQ ID NO: 55, 56, 57, 58, 59, and 54, respectively;SEQ ID NO: 74, 75, 76, 77, 78, and 73, respectively;SEQ ID NO: 93, 94, 95, 96, 97, and 92, respectively;SEQ ID NO: 55, 106, 57, 58, 59, and 54, respectively;SEQ ID NO: 110, 111, 57, 58, 120, and 54, respectively;SEQ ID NO: 55, 106, 57, 58, 120, and 54, respectively;SEQ ID NO: 55, 106, 114, 58, 120, and 54, respectively;SEQ ID NO: 55, 106, 117, 58, 120, and 54, respectively;SEQ ID NO: 182, 183, 184, 58, 59, and 181, respectively; andSEQ ID NO: 197, 198, 199, 200, 201, and 196, respectively;according to Kabat definition scheme; or a group consisting of:SEQ ID NO: 60, 61, 57, 58, 59, and 54, respectively;SEQ ID NO: 79, 80, 76, 77, 78, and 73, respectively;SEQ ID NO: 98, 99, 95, 96, 97, and 92, respectively;SEQ ID NO: 60, 61, 57, 58, 120, and 54, respectivelySEQ ID NO: 60, 61, 114, 58, 120, and 54, respectively;SEQ ID NO: 60, 61, 117, 58, 120, and 54, respectively;SEQ ID NO: 185, 186, 184, 58, 59, and 181, respectively; andSEQ ID NO: 202, 203, 199, 200, 201, and 196, respectively;according to Chothia definition scheme; or a group consisting of:SEQ ID NO: 62, 63, 64, 65, 66, and 67, respectively;SEQ ID NO: 81, 82, 83, 84, 85, and 86, respectively;SEQ ID NO: 100, 101, 102, 103, 104, and 105, respectively;SEQ ID NO: 62, 107, 64, 65, 119, and 67, respectively;SEQ ID NO: 62, 108, 57, 65, 66, and 67, respectively;SEQ ID NO: 112, 108, 64, 65, 121, and 67, respectively;SEQ ID NO: 62, 107, 115, 65, 122, and 67, respectively;SEQ ID NO: 62, 107, 118, 65, 122, and 67, respectively;SEQ ID NO: 62, 107, 64, 65, 122, and 67, respectively;SEQ ID NO: 81, 123, 83, 84, 85, and 86, respectively;SEQ ID NO: 187, 188, 189, 65, 66, and 190, respectively; andSEQ ID NO: 204, 205, 206, 207, 208, and 209, respectively;according to Contact definition scheme;L is a linker comprising -Val‐Cit-PABC-, -Val‐Ala-PABC-, -Glu‐Val‐Cit‐PABC-, -Ala‐Ala‐Asn‐PABC-, -Gly-Val-Cit‐PABC-, -Gly-Gly-Gly‐PABC-, -Gly-Gly-Phe-Gly-PABC-, -Val‐Cit-PAB-, -Val‐Ala-PAB-, -Glu‐Val‐Cit‐PAB-, -Ala‐Ala‐Asn‐PAB-, -Gly-Val-Cit‐PAB-, -Gly-Gly-Gly‐PAB-or -Gly-Gly-Phe-Gly-PAB-; preferably, L is selected from the following structures:wherein n5 denotes an integer from 0 to 20, preferably 1 to 15; and even more preferably, L is selected from the following structures:in each structure, the wavy line to the left represents linkage site to the Ab moiety, and the wavy line to the right represents linkage site to the D moiety;D is the drug moiety, wherein the drug moiety is a cytotoxic agent which is preferably a microtubule disrupting drug such as a tubulin inhibitor, or a DNA damaging agent such as a topoisomerase inhibitor including a topoisomerase I inhibitor such as camptothecin or a derivative thereof; preferably, the cytotoxic agent has a structure ofm is an integer from 1 to 8; andn is any number from 1 to 10.In some embodiments, provided is an anti-CDH17 antibody-drug conjugate, having a formula of Ab- (L- (D) m) n, wherein L is a linker; D is the drug moiety; m is an integer from 1 to 8; n is any number from 1 to 10; and Ab is an antibody comprising a heavy chain variable region having an amino acid sequence selected from a group consisting of SEQ ID NO: 1, 3, 5, 19, 21, 23, 25, 27, 37, 39, 41, 170, 174, and an amino acid sequence having at least 80%sequence identity to each thereof, and / or a light chain variable region having an amino acid sequence selected from a group consisting of SEQ ID NO: 2, 4, 6, 29, 31, 33, 35, 43, 45, 47, 172, 176, and an amino acid sequence having at least 80%sequence identity to each thereof.In some embodiments, provided is an anti-CDH17 antibody-drug conjugate, having a formula of Ab- (L- (D) m) n, wherein L is a linker; D is the drug moiety; m is an integer from 1 to 8; n is any number from 1 to 10; and Ab is an antibody selected from a group consisting of:an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 1 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 1, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 2 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 2;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 3 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 3, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 4 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 4;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 5 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 5, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 6 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 6;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 19 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 19, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 29 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 29;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 21 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 21, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 31 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 31;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 23 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 23, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 33 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 33;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 19 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 19, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 35 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 35;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 25 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 25, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 35 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 35;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 27 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 27, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 35 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 35;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 37 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 37, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 43 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 43;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 39 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 39, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 45 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 45;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 41 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 41, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 47 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 47an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 170 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 170, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 172 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 172; andan anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 174 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 174, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 176 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 176.In some embodiments, provided is an anti-CDH17 antibody-drug conjugate, having a formula of Ab- (L- (D) m) n, wherein L is a linker; D is the drug moiety; m is an integer from 1 to 8; n is any number from 1 to 10; and Ab is an antibody comprising a heavy chain variable region having an amino acid sequence selected from a group consisting of SEQ ID NO: 1, 3, 5, 19, 21, 23, 25, 27, 37, 39, 41, 170, 174, and an amino acid sequence having at least 80%sequence identity to each thereof, and / or a light chain variable region having an amino acid sequence selected from a group consisting of SEQ ID NO: 2, 4, 6, 29, 31, 33, 35, 43, 45, 47, 172, 176, and an amino acid sequence having at least 80%sequence identity to each thereof.In some embodiments, provided is an anti-CDH17 antibody-drug conjugate, having a formula of Ab- (L- (D) m) n, wherein Ab is an antibody selected from a group consisting of:an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 1 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 1, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 2 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 2;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 3 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 3, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 4 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 4;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 5 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 5, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 6 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 6;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 19 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 19, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 29 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 29;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 21 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 21, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 31 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 31;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 23 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 23, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 33 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 33;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 19 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 19, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 35 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 35;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 25 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 25, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 35 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 35;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 27 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 27, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 35 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 35;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 37 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 37, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 43 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 43;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 39 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 39, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 45 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 45; andan anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 41 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 41, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 47 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 47;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 170 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 170, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 172 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 172; andan anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 174 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 174, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 176 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 176;L is a linker comprising -Val‐Cit-PABC-, -Val‐Ala-PABC-, -Glu‐Val‐Cit‐PABC-, -Ala‐Ala‐Asn‐PABC-, -Gly-Val-Cit‐PABC-, -Gly-Gly-Gly‐PABC-, -Gly-Gly-Phe-Gly-PABC-, -Val‐Cit-PAB-, -Val‐Ala-PAB-, -Glu‐Val‐Cit‐PAB-, -Ala‐Ala‐Asn‐PAB-, -Gly-Val-Cit‐PAB-, -Gly-Gly-Gly‐PAB-or -Gly-Gly-Phe-Gly-PAB-; preferably, L is selected from the following structures:wherein n5 denotes an integer from 0 to 20, preferably 1 to 15; and even more preferably, L is selected from the following structures:in each structure, the wavy line to the left represents linkage site to the Ab moiety, and the wavy line to the right represents linkage site to the D moiety;D is the drug moiety, wherein the drug moiety is a cytotoxic agent which is preferably a microtubule disrupting drug such as a tubulin inhibitor, or a DNA damaging agent such as a topoisomerase inhibitor including a topoisomerase I inhibitor such as camptothecin or a derivative thereof; preferably, the cytotoxic agent has a structure ofm is an integer from 1 to 8; andn is any number from 1 to 10.In some embodiments, provided is an anti-CDH17 antibody-drug conjugate, having a formula of Ab- (L- (D) m) n, wherein L is a linker; D is the drug moiety; m is an integer from 1 to 8; n is any number from 1 to 10; and Ab is an antibody comprising a heavy chain having an amino acid sequence selected from a group consisting of SEQ ID NO: 7, 9, 11 , 20, 22, 24, 26, 28, 38, 40, 42, 171, 175, and an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to each thereof; and / or a light chain having an amino acid sequence selected from a group consisting of SEQ ID NO: 8, 10, 12, 30, 32, 34, 36, 44, 46, 48, 173, 177, and an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to each thereof.In some embodiments, provided is an anti-CDH17 antibody-drug conjugate, having a formula of Ab- (L- (D) m) n, wherein L is a linker; D is the drug moiety; m is an integer from 1 to 8; n is any number from 1 to 10; and Ab is an antibody selected from a group consisting of:an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 7 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 7, and a light chain having an amino acid sequence shown in SEQ ID NO: 8 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 8;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 9 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 9, and a light chain having an amino acid sequence shown in SEQ ID NO: 10 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 10;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 11 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 11, and a light chain having an amino acid sequence shown in SEQ ID NO: 12 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 12;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 20 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 20, and a light chain having an amino acid sequence shown in SEQ ID NO: 30 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 30;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 22 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 22, and a light chain having an amino acid sequence shown in SEQ ID NO: 32 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 32;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 24 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 24, and a light chain having an amino acid sequence shown in SEQ ID NO: 34 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 34;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 20 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 20, and a light chain having an amino acid sequence shown in SEQ ID NO: 36 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 36;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 26 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 26, and a light chain having an amino acid sequence shown in SEQ ID NO: 36 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 36;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 28 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 28, and a light chain having an amino acid sequence shown in SEQ ID NO: 36 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 36;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 38 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 38, and a light chain having an amino acid sequence shown in SEQ ID NO: 44 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 44;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 40 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 40, and a light chain having an amino acid sequence shown in SEQ ID NO: 46 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 46;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 42 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 42, and a light chain having an amino acid sequence shown in SEQ ID NO: 48 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 48;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 171 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 171, and a light chain having an amino acid sequence shown in SEQ ID NO: 173 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 173; andan anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 175 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 175, and a light chain having an amino acid sequence shown in SEQ ID NO: 177 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 177.In some embodiments, provided is an anti-CDH17 antibody-drug conjugate, having a formula of Ab- (L- (D) m) n, wherein Ab is an antibody selected from a group consisting of:an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 7 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 7, and a light chain having an amino acid sequence shown in SEQ ID NO: 8 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 8;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 9 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 9, and a light chain having an amino acid sequence shown in SEQ ID NO: 10 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 10;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 11 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 11, and a light chain having an amino acid sequence shown in SEQ ID NO: 12 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 12;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 20 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 20, and a light chain having an amino acid sequence shown in SEQ ID NO: 30 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 30;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 22 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 22, and a light chain having an amino acid sequence shown in SEQ ID NO: 32 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 32;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 24 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 24, and a light chain having an amino acid sequence shown in SEQ ID NO: 34 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 34;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 20 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 20, and a light chain having an amino acid sequence shown in SEQ ID NO: 36 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 36;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 26 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 26, and a light chain having an amino acid sequence shown in SEQ ID NO: 36 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 36;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 28 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 28, and a light chain having an amino acid sequence shown in SEQ ID NO: 36 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 36;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 38 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 38, and a light chain having an amino acid sequence shown in SEQ ID NO: 44 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 44;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 40 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 40, and a light chain having an amino acid sequence shown in SEQ ID NO: 46 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 46;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 42 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 42, and a light chain having an amino acid sequence shown in SEQ ID NO: 48 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 48;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 171 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 171, and a light chain having an amino acid sequence shown in SEQ ID NO: 173 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 173; andan anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 175 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 175, and a light chain having an amino acid sequence shown in SEQ ID NO: 177 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 177;L is a linker comprising -Val‐Cit-PABC-, -Val‐Ala-PABC-, -Glu‐Val‐Cit‐PABC-, -Ala‐Ala‐Asn‐PABC-, -Gly-Val-Cit‐PABC-, -Gly-Gly-Gly‐PABC-, -Gly-Gly-Phe-Gly-PABC-, -Val‐Cit-PAB-, -Val‐Ala-PAB-, -Glu‐Val‐Cit‐PAB-, -Ala‐Ala‐Asn‐PAB-, -Gly-Val-Cit‐PAB-, -Gly-Gly-Gly‐PAB-or -Gly-Gly-Phe-Gly-PAB-; preferably, L is selected from the following structures:wherein n5 denotes an integer from 0 to 20, preferably 1 to 15; and even more preferably, L is selected from the following structures:in each structure, the wavy line to the left represents linkage site to the Ab moiety, and the wavy line to the right represents linkage site to the D moiety;D is the drug moiety, wherein the drug moiety is a cytotoxic agent which is preferably a microtubule disrupting drug such as a tubulin inhibitor, or a DNA damaging agent such as a topoisomerase inhibitor including a topoisomerase I inhibitor such as camptothecin or a derivative thereof; preferably, the cytotoxic agent has a structure ofm is an integer from 1 to 8; andn is any number from 1 to 10.In some embodiments, provided is an anti-CDH17 antibody-drug conjugate having a structure represented by the following formula:wherein n can be any number from 1 to 10; andwherein Ab is an anti-CDH17 antibody comprising a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 which are same as the HCDR1, HCDR2, and HCDR3 of a heavy chain variable region having an amino acid sequence selected from a group consisting of SEQ ID NO: 1, 3, 5, 19, 21, 23, 25, 27, 37, 39, 41, 170, and 174, and / or a light chain variable region comprising LCDR1, LCDR2, and LCDR3 which are same as the LCDR1, LCDR2, and LCDR3 of a light chain variable region having an amino acid sequence selected from a group consisting of SEQ ID NO: 2, 4, 6, 29, 31, 33, 35, 43, 45, 47, 172, and 176; preferably, the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 are defined according to any one of CDR definition schemes selected from a group consisting of IMGT, Kabat, Contact, Chothia, Martin, PyIgClassify, and any combination thereof.In some embodiments, provided is an anti-CDH17 antibody-drug conjugate having a structure represented by the following formula:wherein n can be any number from 1 to 10; andwherein Ab is an anti-CDH17 antibody comprising a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 and a light chain variable region comprising LCDR1, LCDR2, and LCDR3, wherein the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 have amino acid sequences selected from a group consisting of:SEQ ID NO: 49, 50, 51, 52, 53, and 54, respectively;SEQ ID NO: 68, 69, 70, 71, 72, and 73, respectively;SEQ ID NO: 87, 88, 89, 90, 91, and 92, respectively;SEQ ID NO: 109, 50, 51, 52, 53, and 54, respectively;SEQ ID NO: 49, 50, 113, 52, 53, and 54, respectively;SEQ ID NO: 49, 50, 116, 52, 53, and 54, respectively;SEQ ID NO: 178, 179, 180, 52, 53, and 181, respectively; andSEQ ID NO: 191, 192, 193, 194, 195, and 196, respectively;according to IMGT definition scheme; or a group consisting of:SEQ ID NO: 55, 56, 57, 58, 59, and 54, respectively;SEQ ID NO: 74, 75, 76, 77, 78, and 73, respectively;SEQ ID NO: 93, 94, 95, 96, 97, and 92, respectively;SEQ ID NO: 55, 106, 57, 58, 59, and 54, respectively;SEQ ID NO: 110, 111, 57, 58, 120, and 54, respectively;SEQ ID NO: 55, 106, 57, 58, 120, and 54, respectively;SEQ ID NO: 55, 106, 114, 58, 120, and 54, respectively;SEQ ID NO: 55, 106, 117, 58, 120, and 54, respectively;SEQ ID NO: 182, 183, 184, 58, 59, and 181, respectively; andSEQ ID NO: 197, 198, 199, 200, 201, and 196, respectively;according to Kabat definition scheme; or a group consisting of:SEQ ID NO: 60, 61, 57, 58, 59, and 54, respectively;SEQ ID NO: 79, 80, 76, 77, 78, and 73, respectively;SEQ ID NO: 98, 99, 95, 96, 97, and 92, respectively;SEQ ID NO: 60, 61, 57, 58, 120, and 54, respectivelySEQ ID NO: 60, 61, 114, 58, 120, and 54, respectively;SEQ ID NO: 60, 61, 117, 58, 120, and 54, respectively;SEQ ID NO: 185, 186, 184, 58, 59, and 181, respectively; andSEQ ID NO: 202, 203, 199, 200, 201, and 196, respectively;according to Chothia definition scheme; or a group consisting of:SEQ ID NO: 62, 63, 64, 65, 66, and 67, respectively;SEQ ID NO: 81, 82, 83, 84, 85, and 86, respectively;SEQ ID NO: 100, 101, 102, 103, 104, and 105, respectively;SEQ ID NO: 62, 107, 64, 65, 119, and 67, respectively;SEQ ID NO: 62, 108, 57, 65, 66, and 67, respectively;SEQ ID NO: 112, 108, 64, 65, 121, and 67, respectively;SEQ ID NO: 62, 107, 115, 65, 122, and 67, respectively;SEQ ID NO: 62, 107, 118, 65, 122, and 67, respectively;SEQ ID NO: 62, 107, 64, 65, 122, and 67, respectively;SEQ ID NO: 81, 123, 83, 84, 85, and 86, respectively;SEQ ID NO: 187, 188, 189, 65, 66, and 190, respectively; andSEQ ID NO: 204, 205, 206, 207, 208, and 209, respectively;according to Contact definition scheme.In some embodiments, provided is an anti-CDH17 antibody-drug conjugate having a structure represented by the following formula:wherein n can be any number from 1 to 10; andwherein Ab is an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence selected from a group consisting of SEQ ID NO: 1, 3, 5, 19, 21, 23, 25, 27, 37, 39, 41, 170, 174, and an amino acid sequence having at least 80%sequence identity to each thereof, and / or a light chain variable region having an amino acid sequence selected from a group consisting of SEQ ID NO: 2, 4, 6, 29, 31, 33, 35, 43, 45, 47, 172, 176, and an amino acid sequence having at least 80%sequence identity to each thereof.In some embodiments, provided is an anti-CDH17 antibody-drug conjugate having a structure represented by the following formula:wherein n can be any number from 1 to 10; andwherein Ab is an antibody selected from a group consisting of:an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 1 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 1, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 2 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 2;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 3 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 3, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 4 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 4;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 5 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 5, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 6 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 6;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 19 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 19, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 29 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 29;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 21 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 21, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 31 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 31;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 23 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 23, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 33 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 33;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 19 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 19, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 35 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 35;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 25 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 25, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 35 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 35;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 27 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 27, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 35 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 35;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 37 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 37, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 43 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 43;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 39 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 39, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 45 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 45;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 41 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 41, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 47 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 47;an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 170 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 170, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 172 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 172; andan anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 174 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 174, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 176 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 176.In some embodiments, provided is an anti-CDH17 antibody-drug conjugate having a structure represented by the following formula:wherein n can be any number from 1 to 10; andwherein Ab is an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence selected from a group consisting of SEQ ID NO: 7, 9, 11 , 20, 22, 24, 26, 28, 38, 40, 42, 171, 175, and an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to each thereof; and / or a light chain having an amino acid sequence selected from a group consisting of SEQ ID NO: 8, 10, 12, 30, 32, 34, 36, 44, 46, 48, 173, 177, and an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to each thereof.In some embodiments, provided is an anti-CDH17 antibody-drug conjugate having a structure represented by the following formula:wherein n can be any number from 1 to 10; andwherein Ab is an antibody selected from a group consisting of:an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 7 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 7, and a light chain having an amino acid sequence shown in SEQ ID NO: 8 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 8;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 9 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 9, and a light chain having an amino acid sequence shown in SEQ ID NO: 10 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 10;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 11 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 11, and a light chain having an amino acid sequence shown in SEQ ID NO: 12 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 12;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 20 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 20, and a light chain having an amino acid sequence shown in SEQ ID NO: 30 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 30;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 22 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 22, and a light chain having an amino acid sequence shown in SEQ ID NO: 32 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 32;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 24 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 24, and a light chain having an amino acid sequence shown in SEQ ID NO: 34 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 34;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 20 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 20, and a light chain having an amino acid sequence shown in SEQ ID NO: 36 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 36;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 26 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 26, and a light chain having an amino acid sequence shown in SEQ ID NO: 36 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 36;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 28 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 28, and a light chain having an amino acid sequence shown in SEQ ID NO: 36 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 36;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 38 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 38, and a light chain having an amino acid sequence shown in SEQ ID NO: 44 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 44;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 40 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 40, and a light chain having an amino acid sequence shown in SEQ ID NO: 46 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 46;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 42 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 42, and a light chain having an amino acid sequence shown in SEQ ID NO: 48 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 48;an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 171 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 171, and a light chain having an amino acid sequence shown in SEQ ID NO: 173 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 173; andan anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 175 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 175, and a light chain having an amino acid sequence shown in SEQ ID NO: 177 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 177.Pharmaceutical CompositionsThe present disclosure, in another aspect, provides a pharmaceutical composition comprising an antibody or an antibody-drug conjugate as disclosed herein, and a pharmaceutically acceptable carrier. The compositions are suitable for veterinary or human administration.The present compositions can be in any form that allows for the composition to be administered to a patient. For example, the composition can be in the form of a solid, liquid or gas (aerosol) . Typical routes of administration include, without limitation, oral, topical, parenteral, sublingual, rectal, vaginal, ocular, intra-tumor, and intranasal. Parenteral administration includes subcutaneous injections, intravenous, intramuscular, intrasternal injection or infusion techniques. In one aspect, the compositions are administered parenterally. In yet another aspect, the compositions are administered intravenously.Pharmaceutical compositions can be formulated so as to allow a conjugate to be bioavailable upon administration of the composition to a patient. Compositions can take the form of one or more dosage units, where for example, a tablet can be a single dosage unit, and a container of a conjugate in aerosol form can hold a plurality of dosage units.Materials used in preparing the pharmaceutical compositions can be non-toxic in the amounts used. It will be evident to those of ordinary skill in the art that the optimal dosage of the active ingredient (s) in the pharmaceutical composition will depend on a variety of factors. Relevant factors include, without limitation, the type of animal (e.g., human) , the particular form of the conjugate, the manner of administration, and the composition employed.The pharmaceutically acceptable carrier or vehicle can be particulate, so that the compositions are, for example, in tablet or powder form. The carrier (s) can be liquid, with the compositions being, for example, an oral syrup or injectable liquid. In addition, the carrier (s) can be gaseous or particulate, so as to provide an aerosol composition useful in, e.g., inhalatory administration.The composition can be in the form of a liquid, e.g., an elixir, syrup, solution, emulsion or suspension. The liquid can be useful for oral administration or for delivery by injection. When intended for oral administration, a composition can comprise one or more of a sweetening agent, preservatives, dye / colorant and flavor enhancer. In a composition for administration by injection, one or more of a surfactant, preservative, wetting agent, dispersing agent, suspending agent, buffer, stabilizer and isotonic agent can also be included.The liquid compositions, whether they are solutions, suspensions or other like form, can also include one or more of the following: sterile diluents such as water for injection, saline solution, preferably physiological saline, Ringer's solution, isotonic sodium chloride, fixed oils such as synthetic mono or digylcerides which can serve as the solvent or suspending medium, polyethylene glycols, glycerin, cyclodextrin, propylene glycol or other solvents; antibacterial agents such as benzyl alcohol or methyl paraben; antioxidants such as ascorbic acid or sodium bisulfite; chelating agents such as ethylenediaminetetraacetic acid; buffers such as acetates, citrates or phosphates and agents for the adjustment of tonicity such as sodium chloride or dextrose. A parenteral composition can be enclosed in ampoule, a disposable syringe or a multiple-dose vial made of glass, plastic or other material. Physiological saline is an exemplary adjuvant. An injectable composition is preferably sterile.The amount of the conjugate that is effective in the treatment of a particular disorder or condition will depend on the nature of the disorder or condition and can be determined by standard clinical techniques. In addition, in vitro or in vivo assays can optionally be employed to help identify optimal dosage ranges. The precise dose to be employed in the compositions will also depend on the route of administration, and the seriousness of the disease or disorder, and should be decided according to the judgment of the practitioner and each patient's circumstances.The compositions comprise an effective amount of an antibody or a conjugate such that a suitable dosage will be obtained. Typically, this amount is at least about 0.01%of an antibody or a conjugate by weight of the composition. When intended for oral administration, this amount can be varied to range from about 0.1%to about 80%by weight of the composition. In one aspect, oral compositions can comprise from about 4%to about 50%of the antibody or the conjugate by weight of the composition. In yet another aspect, present compositions are prepared so that a parenteral dosage unit contains from about 0.01%to about 2%by weight of the antibody or the conjugate.For intravenous administration, the composition can comprise from about 0.01 to about 100 mg of an antibody or a conjugate per kg of the animal's body weight. In one aspect, the composition can include from about 1 to about 100 mg of an antibody or a conjugate per kg of the animal's body weight. In another aspect, the amount administered will be in the range from about 0.1 to about 25 mg / kg of body weight of the antibody or the conjugate.Generally, the dosage of an antibody or a conjugate administered to a patient is typically about 0.01 mg / kg to about 2000 mg / kg of the animal's body weight. In one aspect, the dosage administered to a patient is between about 0.01 mg / kg to about 10 mg / kg of the animal's body weight, in another aspect, the dosage administered to a patient is between about 0.1 mg / kg and about 250 mg / kg of the animal's body weight, in yet another aspect, the dosage administered to a patient is between about 0.1 mg / kg and about 20 mg / kg of the animal's body weight, in yet another aspect the dosage administered is between about 0.1 mg / kg to about 10 mg / kg of the animal's body weight, and in yet another aspect, the dosage administered is between about 1 mg / kg to about 10 mg / kg of the animal's body weight.The antibodies, the conjugates or compositions can be administered by any convenient route, for example by infusion or bolus injection, by absorption through epithelial or mucocutaneous linings (e.g., oral mucosa, rectal and intestinal mucosa, etc. ) . Administration can be systemic or local. Various delivery systems are known, e.g., encapsulation in liposomes, microparticles, microcapsules, capsules, etc., and can be used to administer a conjugate or composition. In certain embodiments, more than one antibody, conjugate or composition is administered to a patient.In specific embodiments, it can be desirable to administer one or more antibodies, conjugates or compositions locally to the area in need of treatment. This can be achieved, for example, and not by way of limitation, by local infusion during surgery; topical application, e.g., in conjunction with a wound dressing after surgery; by injection; by means of a catheter; by means of a suppository; or by means of an implant, the implant being of a porous, non-porous, or gelatinous material, including membranes, such as sialastic membranes, or fibers. In one embodiment, administration can be by direct injection at the site (or former site) of a cancer, tumor or neoplastic or pre-neoplastic tissue. In another embodiment, administration can be by direct injection at the site (or former site) of a manifestation of an autoimmune disease.In certain embodiments, it can be desirable to introduce one or more antibody, conjugate or compositions into the central nervous system by any suitable route, including intraventricular and intrathecal injection. Intraventricular injection can be facilitated by an intraventricular catheter, for example, attached to a reservoir, such as an Ommaya reservoir.Pulmonary administration can also be employed, e.g., by use of an inhaler or nebulizer, and formulation with an aerosolizing agent, or via perfusion in a fluorocarbon or synthetic pulmonary surfactant.In yet another embodiment, the antibody, conjugate or compositions can be delivered in a controlled release system, such as but not limited to, a pump or various polymeric materials can be used. In yet another embodiment, a controlled-release system can be placed in proximity of the target of the antibody, conjugate or compositions, e.g., the brain, thus requiring only a fraction of the systemic dose.The term “carrier” refers to a diluent, adjuvant or carrier, with which an antibody or a conjugate is administered. Such pharmaceutical carriers can be liquids, such as water and oils, including those of petroleum, animal, vegetable or synthetic origin, such as peanut oil, soybean oil, mineral oil, sesame oil and the like. The carriers can be saline, gum acacia, gelatin, starch paste, talc, keratin, colloidal silica, urea, and the like. In addition, auxiliary, stabilizing, thickening, lubricating and coloring agents can be used. In one embodiment, when administered to a patient, the antibody or the conjugate or compositions and pharmaceutically acceptable carriers are sterile. Water is an exemplary carrier when the antibodies or conjugates are administered intravenously. Saline solutions and aqueous dextrose and glycerol solutions can also be employed as liquid carriers, particularly for injectable solutions. Suitable pharmaceutical carriers also include carriers such as starch, glucose, lactose, sucrose, gelatin, malt, rice, flour, chalk, silica gel, sodium stearate, glycerol monostearate, talc, sodium chloride, dried skim milk, glycerol, propylene, glycol, water, ethanol and the like. The present compositions, if desired, can also contain minor amounts of wetting or emulsifying agents, or pH buffering agents.In an embodiment, the conjugates are formulated in accordance with routine procedures as a pharmaceutical composition adapted for intravenous administration to animals, particularly human beings. Typically, the carriers or vehicles for intravenous administration are sterile isotonic aqueous buffer solutions. Where necessary, the compositions can also include a solubilizing agent. Compositions for intravenous administration can optionally comprise a local anesthetic such as lignocaine to ease pain at the site of the injection. Generally, the ingredients are supplied either separately or mixed together in unit dosage form, for example, as a dry lyophilized powder or water free concentrate in a hermetically sealed container such as an ampoule or sachette indicating the quantity of active agent. Where a conjugate is to be administered by infusion, it can be dispensed, for example, with an infusion bottle containing sterile pharmaceutical grade water or saline. Where the antibody or the conjugate is administered by injection, an ampoule of sterile water for injection or saline can be provided so that the ingredients can be mixed prior to administration.The composition can include various materials that modify the physical form of a solid or liquid dosage unit. For example, the composition can include materials that form a coating shell around the active ingredients. The materials that form the coating shell are typically inert, and can be selected from, for example, sugar, shellac, and other enteric coating agents. Alternatively, the active ingredients can be encased in a gelatin capsule.The compositions can consist of gaseous dosage units, e.g., it can be in the form of an aerosol. The term aerosol is used to denote a variety of systems ranging from those of colloidal nature to systems consisting of pressurized packages. Delivery can be by a liquefied or compressed gas or by a suitable pump system that dispenses the active ingredients.Whether in solid, liquid or gaseous form, the present compositions can include a pharmacological agent used in the treatment of cancer.Uses and TherapiesThe antibodies and conjugates are useful for inhibiting the multiplication of a tumor cell or cancer cell, causing apoptosis in a tumor or cancer cell, or for treating cancer in a patient. The antibodies and the conjugates can be used accordingly in a variety of settings for the treatment of animal cancers. The antibodies and conjugates can be used to deliver a drug or drug unit to a tumor cell or cancer cell. Without being bound by theory, in one embodiment, the antibody or the antibody moiety of the conjugate disclosed herein binds to or associates with CDH17 antigen expressed on, or associated with, the cell surface of a cancer cell or a tumor cell. In the case of a conjugate, the conjugate can be taken up inside a tumor cell or cancer cell through receptor-mediated endocytosis. Once inside the cell, one or more specific peptide sequences within the linker moiety are hydrolytically cleaved by one or more tumor-cell or cancer-cell-associated proteases, resulting in release of a cytotoxic drug or a drug-linker compound. The released cytotoxic drug or drug-linker compound is then free to migrate within the cell and induce cytotoxic or cytostatic activities. In an alternative embodiment, the cytotoxic drug or drug-linker compound is cleaved from the conjugate outside the tumor cell or cancer cell, and the cytotoxic drug or drug-linker compound subsequently penetrates the cell.The present disclosure, in a further aspect, provides a method for treating or preventing cancer in a subject, comprising administering to the subject an effective amount of an antibody or an antibody-drug conjugate disclosed herein.The cancer may be a solid cancer or a hematologic malignancy, positive for CDH17 antigen. A “hematologic malignancy” , also known as a blood cancer, is a cancer that originates in blood-forming tissue, such as the bone marrow or other cells of the immune system. Hematologic malignancies include, without limitation, leukemias (such as acute myeloid leukemia (ANIL) , acute promyelocytic leukemia, acute lymphoblastic leukemia (ALL) , acute mixed lineage leukemia, chronic myeloid leukemia, chronic lymphocytic leukemia (CLL) , hairy, cell leukemia and large granular lymphocytic leukemia) , myelodysplastic syndrome (MDS) , myeloproliferative disorders (polycythemia vera, essential thrombocytosis, primary myelofibrosis and chronic myeloid leukemia) , lymphomas, multiple myeloma, MGUS and similar disorders, Hodgkin’s lymphoma, non-Hodgkin lymphoma (NHL) , primary mediastinal large B-cell lymphoma, diffuse large B-cell lymphoma, follicular lymphoma, transformed follicular lymphoma, splenic marginal zone lymphoma, lymphocytic lymphoma, T-cell lymphoma, and other B-cell malignancies. “Solid cancers” include, without limitation, fibrosarcoma, myxosarcoma, liposarcoma, chondrosarcoma, osteogenic sarcoma, chordoma, angiosarcoma, endotheliosarcoma, lymphangiosarcoma, lymphangioendotheliosarcoma, synovioma, mesothelioma, Ewing's tumor, leiomyosarcoma, rhabdomyosarcoma, colon cancer, colorectal cancer, kidney cancer, pancreatic cancer, bone cancer, breast cancer, ovarian cancer, prostate cancer, esophogeal cancer, stomach cancer, oral cancer, nasal cancer, throat cancer, squamous cell carcinoma, basal cell carcinoma, adenocarcinoma, sweat gland carcinoma, sebaceous gland carcinoma, papillary carcinoma, papillary adenocarcinomas, cystadenocarcinoma, medullary carcinoma, bronchogenic carcinoma, renal cell carcinoma, hepatoma, bile duct carcinoma, choriocarcinoma, seminoma, embryonal carcinoma, Wilms'tumor, cervical cancer, uterine cancer, testicular cancer, small cell lung carcinoma, bladder carcinoma, lung cancer, epithelial carcinoma, glioma, glioblastoma multiforme, astrocytoma, medulloblastoma, craniopharyngioma, ependymoma, pinealoma, hemangioblastoma, acoustic neuroma, oligodendroglioma, meningioma, skin cancer, melanoma, neuroblastoma, retinoblastoma. Preferably, the cancers treatable by the present disclosure include pancreatic cancer, gastric cancer, colorectal cancer, cholangiocarcinoma cancer, liver cancer, neuroendocrine cancer, and esophageal adenocarcinoma.In some embodiments, provided are methods for treating or preventing cancer are provided, including administering to a patient in need thereof a therapeutically effective amount of an antibody or a conjugate disclosed herein and a chemotherapeutic agent. In one embodiment, the chemotherapeutic agent is that with which treatment of the cancer has not been found to be refractory. In another embodiment, the chemotherapeutic agent is that with which the treatment of cancer has been found to be refractory. The antibodies or the conjugates can be administered to a patient that has also undergone surgery as treatment for the cancer.In a specific embodiment, the antibody or the conjugate is administered concurrently with the chemotherapeutic agent or with radiation therapy. In another specific embodiment, the chemotherapeutic agent or radiation therapy is administered prior or subsequent to administration of an antibody or a conjugate, in one aspect at least an hour, five hours, 12 hours, a day, a week, a month, in further aspects several months (e.g., up to three months) , prior or subsequent to administration of an antibody or a conjugate.A chemotherapeutic agent can be administered over a series of sessions. Suitable chemotherapeutic agents include, but are not limited to, methotrexate, taxol, L-asparaginase, mercaptopurine, thioguanine, hydroxyurea, cytarabine, cyclophosphamide, ifosfamide, nitrosoureas, cisplatin, carboplatin, mitomycin, dacarbazine, procarbizine, topotecan, nitrogen mustards, cytoxan, etoposide, 5-fluorouracil, BCNU, irinotecan, camptothecins, bleomycin, doxorubicin, idarubicin, daunorubicin, dactinomycin, plicamycin, mitoxantrone, asparaginase, vinblastine, vincristine, vinorelbine, paclitaxel, and docetaxel. With respect to radiation, any radiation therapy protocol can be used depending upon the type of cancer to be treated. For example, but not by way of limitation, x-ray radiation can be administered; in particular, high-energy megavoltage (radiation of greater that 1 MeV energy) can be used for deep tumors, and electron beam and orthovoltage x-ray radiation can be used for skin cancers. Gamma-ray emitting radioisotopes, such as radioactive isotopes of radium, cobalt and other elements, can also be administered.Additionally, methods of treatment of cancer with an antibody or a conjugate disclosed herein are provided as an alternative to chemotherapy or radiation therapy where the chemotherapy or the radiation therapy has proven or can prove too toxic, e.g., results in unacceptable or unbearable side effects, for the subject being treated. The animal being treated can, optionally, be treated with another cancer treatment such as surgery, radiation therapy or chemotherapy, depending on which treatment is found to be acceptable or bearable.The antibodies or the conjugates can also be used in an in vitro or ex vivo fashion, such as for the treatment of certain cancers, including, but not limited to leukemias and lymphomas, such treatment involving autologous stem cell transplants. This can involve a multi-step process in which the animal's autologous hematopoietic stem cells are harvested and purged of all cancer cells, the animal's remaining bone-marrow cell population is then eradicated via the administration of a high dose of an antibody or a conjugate with or without accompanying high dose radiation therapy, and the stem cell graft is infused back into the animal. Supportive care is then provided while bone marrow function is restored and the animal recovers.Equivalently, the present disclosure also provides an antibody or an antibody-drug conjugate as disclosed herein for use in the treatment of cancer in a subject. Equivalently, the present disclosure also provides use of an antibody or an antibody-drug conjugate as disclosed herein in the manufacturing of a medicament for treatment of cancer in a subject. In both of the equivalent aspects, the cancer is a preferably a CDH17 positive cancer, and more preferably, pancreatic cancer, gastric cancer, colorectal cancer, cholangiocarcinoma cancer, liver cancer, neuroendocrine cancer, or esophageal adenocarcinoma.SequencesNote: where the description relates to CDRs (e.g., SEQ ID NO: 49) , the terms IMGT, Kabat, Chothia, or Contact refer to the different CDR definition schemes as described in the Definition section.ExamplesExample 1 Obtaining Mouse Anti-Human CDH17 Antibody1.1 Immunization of miceRecombinant CDH17 protein was obtained from Sino Biological (Cat. No. 11360-H08H. ) and was used as the immunogen. 8-12 weeks old Balb / c mice were immunized six times with an intra-muscular injection of the immunogen with adjuvant.1.2 Serum detection and screeningThe immunized mice were subjected to blood collection from the eye orbit, and the serum titers were detected by ELISA (recombinant human CDH17 protein was used as coating antigen) . Serum titer need to be greater than 10K for moving to fusion, otherwise the enhanced immunization was continued.1.3 Fusion and screeningThe whole spleen and 1 / 2 lymph node were taken and fused with myeloma SP2 / 0 cell by optimized PEG fusion. The fused cells were plated in four 384-well plates (102 to 104 cells per well) and cultured in 37℃ with 5%CO2. The supernatants from each wells were collected and screened by ELISA to detect the binding of the cell culture supernatant to recombinant human CDH17 protein, and hybridoma cells from the binding-postive wells were transferred to 96-well plates for further culture. After several days of growth, the supernatants from each wells were collected and detected for binding to recombinant human CDH17 protein by ELISA. Positive supernatants were further detected for the binding to serial diluted human CDH17 protein for affinity ranking, and 120 parental clones with the highest affinity were selected for subcloning.1.4 Subcloning and screeningSubcloning was performed by a limited dilution method and the hybridomas were screened by ELISA. Cells were plated in a 96-well plate and cultured to cover approximately 1 / 6 bottom of the plate. The binding of the supernatant in each well to the human CDH17 recombinant protein was detected by ELISA, and two wells with high OD values and good cell status were used for the next round of subcloning. After the last round of subcloning, all positive monoclonal hybridomas were immediately expanded. A portion of each hybridoma was frozen for later use, and the other portion was used for ascites preparation.1.5 Ascites preparation and antibody purificationMonoclonal hybridoma was injected to the abdomen of F1 mice for antibody production. The produced ascites was purified with Protein A / G and the concentration of the antibodies was determined by BCA method.Example 2 In Vitro Evaluation of Anti-CDH17 Antibodies2.1 Binding Affinity of Anti-CDH17 antibodies on COLO 205 cellThe binding EC50 of the anti-CDH17 antibodies on tumor cell were tested as follow. Cell culture of human colon cancer cell line COLO 205 (purchased from National Collection of Authenticated Cell Cultures) was maintained in vitro as independent monolayer cultures at 37℃ with 5%CO2. Cells were harvested by incubating with 1xPBS containing 1mM EDTA followed by centrifugation at 1000 r. p. m for 5 minutes. The cell was resuspended in cold PBS and a serial dilution of CL075814, CL075835 and CL075942 antibodies were added to the respective wells. The cell solutions were mixed, incubated at 4℃ for 45 min and then washed with cold PBS prior to addition of Alexa488-conjugated AffiniPure Goat Anti-Mouse IgG (H+L) (Jackson Immuno Research LABORATOTIES. INC. ) secondary antibody at a dilution of 1: 300. After incubation at 4℃ for 30 min, the cells were washed with cold PBS, and then subjected to flow cytometry analysis. FIG. 1A shows that CL075814 binds to COLO 205 cell with an EC50 of 0.83 nM, CL075835 binds to COLO 205 cell with an EC50 of 3.82 nM. FIG. 1B shows that CL075942 binds to COLO 205 cell with an EC50 of 4.31 nM.2.2 Anti-CDH17 antibodies specifically recognize CDH17 overexpressed on the surface of 293T cellsThe plasmid for expression of human CDH17 fused to GFP (pCDNA3.1-h. CDH17-GFP) was obtained from YouBio and transfected into 293T cell and immunofluorescence staining was performed to determine the binding specificity of anti-CDH17 antibodies CL075814 and CL075835. Briefly, sterile cover slides were put into six well plates. 5x105 293T cells were seeded to each well and cultured at 37℃ overnight. On the next day, pCNDA3.1-h. CDH17-GFP was transfected into the cells using Lipofectamine LTX &PLUSTM Reagent following the manufacture’s protocol. 48 hours after the transfection, successful expression of the fusion protein was confirmed by examine GFP signal under fluorescence microscope. Then, cover slides with the transfected cells were washed with cold PBS, fixed with 4%paraformaldehyde, blocked with blocking solution (PBS containing 10%goat serum) . CL075814, CL075835 were diluted to 20 μg / mL with the blocking solution, added onto the cover slides and incubated at 4℃ overnight. 300 uL of 1: 300 diluted Alexa Fluor 594 AffiniPure Goat Anti-Mouse IgG (H+L) secondary antibody was then added onto each cover slides after washing with cold PBS. The cover slides were further incubated at RT for 1 hour protecting from light. Finally, the cover slides were incubated with 1: 10000 diluted DAPI for 5 minutes and washed four times with PBS then analyzed under fluorescence microscope. The results of immunofluorescence staining with CL075814 was show in FIG. 2. FIG. 2A shows the signal from human CDH17-GFP protein, which indicates the location of expressed CDH17. FIG. 2B shows the signal from CL075814 staining. FIG. 2C shows the DAPI staining of nucleus of the cells. FIG. 2D shows the merged view of FIG. 2A, FIG. 2B and FIG. 2C. The merged view in FIG. 2D shows that the CL075814 staining co-localized well with h. CDH17-GFP fusion protein, which means that CL075814 specifically binds to human CDH17 expressed on the surface of 293T cell. The results of immunofluorescence staining with CL075835 was show in FIG. 3. FIG. 3A shows the signal from human CDH17-GFP protein, which indicates the location of expressed CDH17. FIG. 3B shows the signal from CL075835 staining. FIG. 3C shows the DAPI staining of nucleus of the cells. FIG. 3D shows the merged view of FIG. 3A, FIG. 3B and FIG. 3C. The merged view in FIG. 3D shows that the CL075835 staining co-localized well with h. CDH17-GFP fusion protein, which means that CL075835 specifically binds to human CDH17 expressed on the surface of 293T cell.Example 3 Determination of Nucleotide Sequences of cDNA Encoding the Variable Region of Mouse anti-CDH17 AntibodiesIndividual hybridoma clones of CL075814, CL075835 and CL075942 were cultured in T25 flasks with 10 mL hybridoma cell culture medium (PFHM-II Protein-Free Hybridoma Medium) . Cells were grown at 37℃ until 80%confluent. Culture medium was then removed and cells were twice washed with 1x PBS. 1mL TRIzol reagent was added directly to the flask and cells were lysed by mixing with pipette. The cell lysate was then recovered from the T25 flask and total RNA was isolated using standard methods. cDNA was then generated from the isolated RNA according to the TaKaRa PrimeScript II 1st strand cDNA synthesis kit protocol. Amplification of the hybridoma V-region of the resultant cDNA was then performed according TaKaRa Premix TaqTM (TaKaRa TaqTM Version 2.0 plus dye) protocol. Primer pairs, as listed in Table 1 below, were used for amplification.Table 1. Primers for amplifying nucleic acids encoding anti-CDH17 antibodiesPCR products were checked with 1%agarose gel. Positive PCR products were recovered using QIAgen gel extraction kits and subsequently cloned into pGM-T vector using pGM-T ligation kit (TIANGEN, VT202-02) . pGM-T vectors with PCR product insertion were transformed into DH5a competent cells and cultured on Ampicillin-positive agar plates. Each bacterial clone was sent for Sanger sequencing using the SP6 primer (5’ -ATTTAGGTGACACTATAG-3’ , SEQ ID NO. 165) . Obtained sequences were compared for consistence to confirm target VH and VL sequences, respectively. VH and VL sequences were then analyzed on the IMGT database (imgt. org) to provide the V-region, Frame and CDR elements of VH and VL.Example 4 Production and in vitro Evaluation of Chimeric Anti-CDH17 Antibodies4.1 Expression and Purification of The Chimeric Anti-CDH17 Antibodies.pcDNA3.1-HC containing the human IgG1 heavy chain constant region and pcDNA3.1-LC containing the human IgG1 light chain constant region were used as expression vectors. The VH and VL of CL075814 were synthesized and cloned into pCDNA3.1-HC and pCDNA3.1-LC, respectively, resulting in Ch814-HC and Ch814-LC. Ch814-HC and Ch814-LC were mixed 1: 1 and transfected into 293F cell using Polyethylenimine ‘Max’ (MW 40,000) (24765-2, Polysciences, Inv. ) as transfection reagent and cultured under 125 r. p. m shaking at 37℃ with 5%CO2 for 7 days. The supernatant was then harvested and chimeric antibody Ch814 was purified following standard protein A purification procedure and the concentration of the purified antibody was determined by UV method. The chimeric antibodies Ch835, Ch942, Ch2E21, and Ch2F12 were produced the same way.4.2 Flow Cytomerty Analysis of Binding EC50 of Anti-CDH17 Chimeric Antibodies on Human Pancreatic Cancer Cell line AsPC-1.Cell culture of human pancreatic cancer cell line AsPC-1 (purchased from National Collection of Authenticated Cell Cultures) was maintained in vitro as independent monolayer cultures at 37℃ with 5%CO2. The binding EC50 of Ch814, Ch835 and Ch942 were determined following the same procedure described in example 2.2. FIG. 4 shows that Ch814 binds to AsPC-1 cell with an EC50 of 0.74 nM, Ch835 binds to AsPC-1 cell with an EC50 of 2.37 nM, Ch942 binds to AsPC-1 cell with an EC50 of 1.97 nM.Example 5 Production and in vitro Evaluation of Humanized Anti-CDH17 AntibodiesThe mouse Anti-CDH17 antibody CL075814 was humanized by CDR grafting (Proc. Nal. Acad. Sci. USA 86, 10029-10033 (1989) . The CDR regions of CL075814 were grafted to the most similar human germ line sequences. Some of the key residues that are important were back mutated based on, for example, the criteria given by Queen et al. (Proc. Nal. Acad. Sci. USA 86, 10029-10033 (1989) .Five humanized heavy chain variants were named Hu814-H1, Hu814-H2, Hu814-H3, Hu814-H4, Hu814-H5. The amino acid sequence of the Hu814-H1 heavy chain is shown in SEQ ID NO: 20. The amino acid sequence of the Hu814-H2 heavy chain is shown in SEQ ID NO: 22. The amino acid sequence of the Hu814-H3 heavy chain is shown in SEQ ID NO: 24. The amino acid sequence of the Hu814-H4 heavy chain is shown in SEQ ID NO: 26. The amino acid sequence of the Hu814-H5 heavy chain is shown in SEQ ID NO: 28. Four humanized light chain variants were named Hu814-L1, Hu814-L2, Hu814-L3, Hu814-L4. The amino acid sequence of the Hu814-L1 light chain is shown in SEQ ID NO: 30. The amino acid sequence of the Hu814-L2 light chain is shown in SEQ ID NO: 32. The amino acid sequence of the Hu814-L3 light chain is shown in SEQ ID NO: 34. The amino acid sequence of the Hu814-L4 light chain is shown in SEQ ID NO: 36.The DNA sequences encoding the full length Hu814-H1, Hu814-H2, Hu814-H3, Hu814-H4, Hu814-H5, Hu814-L1, Hu814-L2, Hu814-L3, Hu814-L4 amino acid sequences were individually synthesized and constructed into pcDNA3.1 expression vector. The antibodies Hu814-H1L1, Hu814-H2L2, Hu814-H3L3 and Hu814-H1L4, Hu814-H4L4, Hu814-H5L4 were produced in 293F cell following the same procedure described in example 4.1.The binding EC50 of the humanized antibodies on COLO 205 or SNU-16 tumor cells were tested following the same procedure described in example 2.2. FIG. 5A shows that Hu814-H1L1, Hu814-H2L2 binds to COLO 205 cell with comparable affinity as the chimeric antibody Ch814, while the binding affinity of Hu814-H3L3 is much weaker than other humanized antibodies. FIG. 5B shows that Hu814-H1L4, Hu814-H4L4 and Hu814-H5L4 binds to SNU-16 cell with comparable affinity as the chimeric antibody Ch814.The mouse Anti-CDH17 antibody CL075835 was humanized by the same methods. Three humanized heavy chain variants were named Hu835-H1, Hu835-H2, and Hu835-H3; and three humanized light chain variants were named Hu835-L1, Hu835-L2, and Hu835-L3. The amino acid sequence of the Hu835-H1 heavy chain is shown in SEQ ID NO: 38. The amino acid sequence of the Hu835-H2 heavy chain is shown in SEQ ID NO: 40. The amino acid sequence of the Hu835-H3 heavy chain is shown in SEQ ID NO: 42. The amino acid sequence of the Hu835-L1 light chain is shown in SEQ ID NO: 44. The amino acid sequence of the Hu835-L2 light chain is shown in SEQ ID NO: 46. The amino acid sequence of the Hu835-L3 light chain is shown in SEQ ID NO: 48. Results are shown in FIG. 6. Hu835-H1L1, Hu835-H2L2 and Hu835-H3L3 binds to human gastric cell line AGS with comparable affinity as the chimeric antibody Ch835.Example 6 Analysis of Binding Affinity Against Human and Monkey CDH17Plasmids encoding human CDH17 fused with GFP (pcDNA3.1-h. CDH17-GFP) and cyno monkey CDH17 fused with GFP (pcDNA3.1-c. CDH17-GFP) were obtained from YouBio. 293F cells were cultured with OPM-293 CD05 medium in an incubator with shaking (125 r.p. m) at 37℃, 5%CO2. When the cell density reaches 2x106 / mL and the viability is greater than 95%, 20 mL of the cells were put into a 125 mL flask, a total of 3 flasks were prepared. pcDNA3.1-h. CDH17-GFP, pcDNA3.1-c. CDH17-GFP, and the empty vector expression GFP only (pcDNA3.1-GFP) were transfected into the 293F cells with PEI max reagent following standard procedure. 48 hours after transfection, the expression of the fusion protein was confirmed by examine the GFP signal under fluorescence microscope. Then Cells were harvested by centrifugation at 1000 r. p. m for 5 minutes. The cells were resuspended in cold PBS and aliquoted into 96 well plates and a serial dilution of Hu814-H1L4 , Hu814-H5L4 were added to the respective wells. The cell solutions were mixed, incubated at 4℃ for 45 min and then washed with cold PBS prior to addition of Anti-Human IgG (Fc specific ) -FITC antibody produced in goat (SIGMA, F9512-2ML) secondary antibody at a dilution of 1: 300. After incubation at 4℃, the cells were washed with cold PBS, and then subjected to flow cytometry analysis. FIG. 7 A shows that Hu814-H1L4 binds to 293F-h. CDH17-GFP with an EC50 of 1.97 nM, binds to 293F-c. CDH17-GFP with an EC50 of 2.11 nM, and the antibody does not bind to 293F-vector. FIG. 7B shows that Hu814-H5L4 binds to 293F-h. CDH17-GFP with an EC50 of 3.23 nM, binds to 293F-c. CDH17-GFP with an EC50 of 4.11 nM, and the antibody does not bind to 293F-vector.Example 7 In Vitro Stability Assessment of Humanized Anti-CDH17 AntibodiesLong term stability is critical for antibody-based therapeutics to be successfully developed. Accelerated stability assessment under 40℃ are generally used as a surrogate for long term stability of antibody. So, we evaluated the stability of Hu814-H1L4 and Hu814-H5L4 under 40℃ incubation. Hu814-H1L4 and Hu814-H5L4 were prepared at a concentration of 20 mg / kg in 20 mM Histidine-acetate, 150 mM NaCl, pH 5.5 buffer, and aliquoted into 3 tubes each. One tube of the antibodies were marked as T0 and stored at -80℃, the other tubes of the antibodies were marked as Day14 and Day28 and incubated at 40℃ for 14 days and 28 days, respectively. After incubation, the T0, Day14 and Day 28 samples were subjected to flow cytometry analysis following the procedure described in example 6 to determine the binding affinity of the samples on SNU-16 gastric cancer cell line. In addition, the T0 and Day14 samples were also analyzed by size exclusion chromatography (SEC) , reduced capillary electrophoresis sodium dodecyl sulfate (rCE-SDS) , non-reduced capillary electrophoresis sodium dodecyl sulfate (nrCE-SDS) , and imaged capillary isoelectric focusing (iCIEF) following standard procedure. FIG. 8A shows that Hu814-H1L4 Day14 sample has similar EC50 as that of the T0 sample. However, the binding EC50 of Hu814-H1L4 decreased slightly from 2.41 nM to 5.8nM after incubating at 40℃ for 28 days. FIG. 8B shows that no significant change in EC50 was observed even after incubating Hu814-H5L4 at 40℃ for 28 days. Table 2 shows that no significant changes in main peaks of SEC, rCE-SDS and nr-CE-SDS were observed for neither Hu814-H1L4 nor Hu814-H5L4 after incubating at 40℃ for 14 days. The main peak of iCIEF decreased 17.5%for Hu814-H4L4 after incubating at 40℃ for 14 days. The main peak of iCIEF also decreased for Hu814-H5L4 after incubating at 40℃ for 14 days. However, the decrease is lesser than that of CL07814-H1L4.Table 2 Summary of SEC, rCE, nrCE and iCIEF resultsExample 8 Production of Anti-HER3 Antibody Patritumab, Anti-Trop2 Antibody Datopotamab and Anti-CDH17 Reference AntibodyRAb17.Patritumab is an antibody recognizing human HER3 protein. The heavy chain sequence (SEQ ID NO: 13) of patritumab was obtained from KEGG DRUG Database. DNA encoding the heavy chain was synthesized and cloned into pcDNA3.1 vector, resulting in patritumab-HC. The light chain sequence (SEQ ID NO: 14) of patritumab was obtained from KEGG DRUG Database. DNA encoding the light chain was synthesized and cloned into pcDNA3.1 vector, resulting in patritumab-LC. Patritumab-HC and patritumab-LC were mixed 1: 1 and transfected into 293F cells using PEI reagent and cultured under 125 r.p. m shaking at 37℃ with 5%CO2 for 7 days. The supernatant was then harvested and patritumab was purified following standard protein A purification procedure and the concentration of the purified antibody was determined by UV method.Datopotamab is an antibody recognizing human Trop2 protein. The heavy chain sequence (SEQ ID NO: 17) and light chain sequence (SEQ ID NO: 18) of datopotamab was also obtained from KEGG DRUG Database. Datopotamab was produced following the same procedure as producing patritumab.RAb17 is a reference antibody recognizing human CDH17 protein. The heavy chain sequence (HC, SEQ ID NO: 167) and light chain sequence (LC, SEQ ID NO: 168) of RAb17 was obtained from patent US9207242B2. RAb17 was produced following the same procedure as producing patritumab.Example 9 Determine the Binding Domain of Anti-Human CDH17 AntibodiesHu814-H1L4, Hu835-H1L1, Ch942, Ch2F12, and RAb17 bind to human CDH17, but do not bind to mouse CDH17. Ch2E21 binds to both human CDH17 and mouse CDH17, but the binding on mouse CDH17 is weak comparing with human CDH17. The binding domain of these anti-CDH17 antibodies on human CDH17 were determined by a domain swapping approach. To construct domain swapping plasmids, each of the seven extracellular domains (ECD1, ECD2, ECD3, ECD4, ECD5, ECD6, and ECD7) of human CDH17 were replaced with the corresponding extracellular domain sequences of mouse CDH17, and the constructs were also fused with GFP protein, resulting in pcDNA3.1-ECD1-GFP, pcDNA3.1-ECD2-GFP, pcDNA3.1-ECD3-GFP, pcDNA3.1-ECD4-GFP, pcDNA3.1-ECD5-GFP, p...
Claims
1.An antibody binding to cadherin-17 or an antigen binding fragment thereof, wherein the antibody or the antigen binding fragment thereof specifically binds to a polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128 or in SEQ ID NO: 166.2.The antibody or the antigen binding fragment thereof according to claim 1, wherein the antibody has competitive binding activity with the polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128 or in SEQ ID NO: 166 against an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence selected from a group consisting of SEQ ID NO: 1, 3, 5, 19, 21, 23, 25, 27, 37, 39, 41, 170, 174, and an amino acid sequence having at least 80%sequence identity to each thereof, and a light chain variable region having an amino acid sequence selected from a group consisting of SEQ ID NO: 2, 4, 6, 29, 31, 33, 35, 43, 45, 47, 172, 176, and an amino acid sequence having at least 80%sequence identity to each thereof.3.The antibody or the antigen binding fragment thereof according to claim 2, wherein the antibody has competitive binding activity with the polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128 or in SEQ ID NO: 166 against an anti-CDH17 antibody selected from a group consisting of:(a) an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 1 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 1, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 2 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 2;(b) an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 3 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 3, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 4 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 4;(c) an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 5 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 5, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 6 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 6;(d) an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 19 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 19, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 29 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 29;(e) an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 21 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 21, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 31 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 31;(f) an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 23 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 23, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 33 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 33;(g) an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 19 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 19, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 35 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 35;(h) an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 25 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 25, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 35 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 35;(i) an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 27 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 27, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 35 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 35;(j) an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 37 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 37, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 43 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 43;(k) an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 39 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 39, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 45 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 45;(l) an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 41 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 41, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 47 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 47;(m) an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 170 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 170, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 172 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 172; and(n) an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 174 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 174, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 176 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 176.4.The antibody or the antigen binding fragment thereof according to claim 2 or 3, wherein the antibody has competitive binding activity with the polypeptide having an amino acid sequence shown in SEQ ID NO: 127 and / or 128 or in SEQ ID NO: 166 against an anti-CDH17 antibody selected from a group consisting of:(a) an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 7 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 7, and a light chain having an amino acid sequence shown in SEQ ID NO: 8 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 8;(b) an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 9 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 9, and a light chain having an amino acid sequence shown in SEQ ID NO: 10 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 10;(c) an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 11 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 11, and a light chain having an amino acid sequence shown in SEQ ID NO: 12 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 12;(d) an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 20 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 20, and a light chain having an amino acid sequence shown in SEQ ID NO: 30 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 30;(e) an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 22 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 22, and a light chain having an amino acid sequence shown in SEQ ID NO: 32 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 32;(f) an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 24 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 24, and a light chain having an amino acid sequence shown in SEQ ID NO: 34 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 34;(g) an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 20 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 20, and a light chain having an amino acid sequence shown in SEQ ID NO: 36 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 36;(h) an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 26 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 26, and a light chain having an amino acid sequence shown in SEQ ID NO: 36 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 36;(i) an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 28 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 28, and a light chain having an amino acid sequence shown in SEQ ID NO: 36 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 36;(j) an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 38 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 38, and a light chain having an amino acid sequence shown in SEQ ID NO: 44 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 44;(k) an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 40 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 40, and a light chain having an amino acid sequence shown in SEQ ID NO: 46 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 46;(l) an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 42 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 42, and a light chain having an amino acid sequence shown in SEQ ID NO: 48 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 48;(m) an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 171 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 171, and a light chain having an amino acid sequence shown in SEQ ID NO: 173 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 173; and(n) an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 175 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 175, and a light chain having an amino acid sequence shown in SEQ ID NO: 177 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 177.5.An antibody specifically binding to cadherin-17, preferably human cadherin-17, or an antigen binding fragment thereof, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 which are same as the HCDR1, HCDR2, and HCDR3 of a heavy chain variable region having an amino acid sequence selected from a group consisting of SEQ ID NO: 1, 3, 5, 19, 21, 23, 25, 27, 37, 39, 41, 170, and 174, and / or a light chain variable region comprising LCDR1, LCDR2, and LCDR3 which are same as the LCDR1, LCDR2, and LCDR3 of a light chain variable region having an amino acid sequence selected from a group consisting of SEQ ID NO: 2, 4, 6, 29, 31, 33, 35, 43, 45, 47, 172, and 176.6.The antibody or an antigen binding fragment thereof according to claim 5, wherein the antibody comprises a heavy chain variable region comprising HCDR1, HCDR2, and HCDR3 having amino acid sequences selected from a group consisting of:SEQ ID NO: 49, 50, and 51, respectively;SEQ ID NO: 68, 69, and 70, respectively;SEQ ID NO: 87, 88, and 89, respectively;SEQ ID NO: 109, 50, and 51, respectively;SEQ ID NO: 49, 50, and 113, respectively;SEQ ID NO: 49, 50, and 116, respectively;SEQ ID NO: 178, 179, and 180, respectively; andSEQ ID NO: 191, 192, and 193, respectively;according to IMGT definition scheme; or a group consisting of:SEQ ID NO: 55, 56, and 57, respectively;SEQ ID NO: 74, 75, and 76, respectively;SEQ ID NO: 93, 94, and 95, respectively;SEQ ID NO: 55, 106, and 57, respectively;SEQ ID NO: 110, 111, and 57, respectively;SEQ ID NO: 55, 106, and 114, respectively;SEQ ID NO: 55, 106, and 117, respectively;SEQ ID NO: 182, 183, and 184, respectively; andSEQ ID NO: 197, 198, and 199, respectively;according to Kabat definition scheme; or a group consisting of:SEQ ID NO: 60, 61, and 57, respectively;SEQ ID NO: 79, 80, and 76, respectively;SEQ ID NO: 98, 99, and 95, respectively;SEQ ID NO: 60, 61, and 114, respectively;SEQ ID NO: 60, 61, and 117, respectively;SEQ ID NO: 185, 186, and 184, respectively; andSEQ ID NO: 202, 203, and 199, respectively;according to Chothia definition scheme; or a group consisting of:SEQ ID NO: 62, 63, and 64, respectively;SEQ ID NO: 81, 82, and 83, respectively;SEQ ID NO: 100, 101, and 102, respectively;SEQ ID NO: 62, 107, and 64, respectively;SEQ ID NO: 62, 108, and 57, respectively;SEQ ID NO: 112, 108, and 64, respectively;SEQ ID NO: 62, 107, and 115, respectively;SEQ ID NO: 62, 107, and 118, respectively;SEQ ID NO: 81, 123, and 83, respectively;SEQ ID NO: 187, 188, and 189, respectively; andSEQ ID NO: 204, 205, and 206, respectively;according to Contact definition scheme;and / or a light chain variable region comprising LCDR1, LCDR2, and LCDR3 having amino acid sequences selected from a group consisting of:SEQ ID NO: 52, 53, and 54, respectively;SEQ ID NO: 71, 72, and 73, respectively;SEQ ID NO: 90, 91, and 92, respectively;SEQ ID NO: 52, 53, and 181, respectively; andSEQ ID NO: 194, 195, and 196, respectively;according to IMGT definition scheme; or a group consisting of:SEQ ID NO: 58, 59, and 54, respectively;SEQ ID NO: 77, 78, and 73, respectively;SEQ ID NO: 96, 97, and 92, respectively;SEQ ID NO: 58, 120, and 54, respectively;SEQ ID NO: 58, 59, and 181, respectively; andSEQ ID NO: 200, 201, and 196, respectively;according to Kabat definition scheme; or a group consisting of:SEQ ID NO: 65, 66, and 67, respectively;SEQ ID NO: 84, 85, and 86, respectively;SEQ ID NO: 103, 104, and 105, respectively;SEQ ID NO: 65, 119, and 67, respectively;SEQ ID NO: 65, 121, and 67, respectively;SEQ ID NO: 65, 122, and 67, respectively;SEQ ID NO: 65, 66, and 190, respectively; andSEQ ID NO: 207, 208, and 209, respectively;according to Contact definition scheme.7.The antibody or an antigen binding fragment thereof according to claim 5, wherein the HCDR1, HCDR2, HCDR3, LCDR1, LCDR2, and LCDR3 have amino acid sequences selected from a group consisting of:SEQ ID NO: 49, 50, 51, 52, 53, and 54, respectively;SEQ ID NO: 68, 69, 70, 71, 72, and 73, respectively;SEQ ID NO: 87, 88, 89, 90, 91, and 92, respectively;SEQ ID NO: 109, 50, 51, 52, 53, and 54, respectively;SEQ ID NO: 49, 50, 113, 52, 53, and 54, respectively;SEQ ID NO: 49, 50, 116, 52, 53, and 54, respectively;SEQ ID NO: 178, 179, 180, 52, 53, and 181, respectively; andSEQ ID NO: 191, 192, 193, 194, 195, and 196, respectively;according to IMGT definition scheme; or a group consisting of:SEQ ID NO: 55, 56, 57, 58, 59, and 54, respectively;SEQ ID NO: 74, 75, 76, 77, 78, and 73, respectively;SEQ ID NO: 93, 94, 95, 96, 97, and 92, respectively;SEQ ID NO: 55, 106, 57, 58, 59, and 54, respectively;SEQ ID NO: 110, 111, 57, 58, 120, and 54, respectively;SEQ ID NO: 55, 106, 57, 58, 120, and 54, respectively;SEQ ID NO: 55, 106, 114, 58, 120, and 54, respectively;SEQ ID NO: 55, 106, 117, 58, 120, and 54, respectively;SEQ ID NO: 182, 183, 184, 58, 59, and 181, respectively; andSEQ ID NO: 197, 198, 199, 200, 201, and 196, respectively;according to Kabat definition scheme; or a group consisting of:SEQ ID NO: 60, 61, 57, 58, 59, and 54, respectively;SEQ ID NO: 79, 80, 76, 77, 78, and 73, respectively;SEQ ID NO: 98, 99, 95, 96, 97, and 92, respectively;SEQ ID NO: 60, 61, 57, 58, 120, and 54, respectivelySEQ ID NO: 60, 61, 114, 58, 120, and 54, respectively;SEQ ID NO: 60, 61, 117, 58, 120, and 54, respectively;SEQ ID NO: 185, 186, 184, 58, 59, and 181, respectively; andSEQ ID NO: 202, 203, 199, 200, 201, and 196, respectively;according to Chothia definition scheme; or a group consisting of:SEQ ID NO: 62, 63, 64, 65, 66, and 67, respectively;SEQ ID NO: 81, 82, 83, 84, 85, and 86, respectively;SEQ ID NO: 100, 101, 102, 103, 104, and 105, respectively;SEQ ID NO: 62, 107, 64, 65, 119, and 67, respectively;SEQ ID NO: 62, 108, 57, 65, 66, and 67, respectively;SEQ ID NO: 112, 108, 64, 65, 121, and 67, respectively;SEQ ID NO: 62, 107, 115, 65, 122, and 67, respectively;SEQ ID NO: 62, 107, 118, 65, 122, and 67, respectively;SEQ ID NO: 62, 107, 64, 65, 122, and 67, respectively;SEQ ID NO: 81, 123, 83, 84, 85, and 86, respectively;SEQ ID NO: 187, 188, 189, 65, 66, and 190, respectively; andSEQ ID NO: 204, 205, 206, 207, 208, and 209, respectively;according to Contact definition scheme.8.The antibody or an antigen binding fragment thereof according to claim 5, wherein the antibody comprises a heavy chain variable region having an amino acid sequence selected from a group consisting of SEQ ID NO: 1, 3, 5, 19, 21, 23, 25, 27, 37, 39, 41, 170, 174, and an amino acid sequence having at least 80%sequence identity to each thereof, and / or a light chain variable region having an amino acid sequence selected from a group consisting of SEQ ID NO: 2, 4, 6, 29, 31, 33, 35, 43, 45, 47, 172, 176, and an amino acid sequence having at least 80%sequence identity to each thereof.9.The antibody or an antigen binding fragment thereof according to claim 8, wherein the antibody is selected from a group consisting of:(a) an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 1 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 1, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 2 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 2;(b) an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 3 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 3, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 4 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 4;(c) an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 5 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 5, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 6 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 6;(d) an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 19 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 19, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 29 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 29;(e) an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 21 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 21, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 31 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 31;(f) an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 23 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 23, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 33 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 33;(g) an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 19 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 19, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 35 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 35;(h) an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 25 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 25, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 35 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 35;(i) an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 27 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 27, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 35 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 35;(j) an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 37 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 37, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 43 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 43;(k) an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 39 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 39, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 45 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 45; and(l) an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 41 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 41, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 47 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 47;(m) an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 170 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 170, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 172 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 172; and(n) an anti-CDH17 antibody comprising a heavy chain variable region having an amino acid sequence shown in SEQ ID NO: 174 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 174, and a light chain variable region having an amino acid sequence shown in SEQ ID NO: 176 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 176.10.The antibody or an antigen binding fragment thereof according to claim 5, wherein the antibody comprises a heavy chain having an amino acid sequence selected from a group consisting of SEQ ID NO: 7, 9, 11, 20, 22, 24, 26, 28, 38, 40, 42, 171, 175, and an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to each thereof; and / or a light chain having an amino acid sequence selected from a group consisting of SEQ ID NO: 8, 10, 12, 30, 32, 34, 36, 44, 46, 48, 173, 177, and an amino acid sequence having at least 80%, at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%sequence identity to each thereof.11.The antibody or an antigen binding fragment thereof according to claim 10, wherein the antibody is selected from a group consisting of:(a) an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 7 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 7, and a light chain having an amino acid sequence shown in SEQ ID NO: 8 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 8;(b) an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 9 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 9, and a light chain having an amino acid sequence shown in SEQ ID NO: 10 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 10;(c) an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 11 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 11, and a light chain having an amino acid sequence shown in SEQ ID NO: 12 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 12;(d) an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 20 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 20, and a light chain having an amino acid sequence shown in SEQ ID NO: 30 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 30;(e) an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 22 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 22, and a light chain having an amino acid sequence shown in SEQ ID NO: 32 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 32;(f) an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 24 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 24, and a light chain having an amino acid sequence shown in SEQ ID NO: 34 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 34;(g) an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 20 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 20, and a light chain having an amino acid sequence shown in SEQ ID NO: 36 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 36;(h) an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 26 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 26, and a light chain having an amino acid sequence shown in SEQ ID NO: 36 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 36;(i) an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 28 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 28, and a light chain having an amino acid sequence shown in SEQ ID NO: 36 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 36;(j) an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 38 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 38, and a light chain having an amino acid sequence shown in SEQ ID NO: 44 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 44;(k) an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 40 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 40, and a light chain having an amino acid sequence shown in SEQ ID NO: 46 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 46;(l) an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 42 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 42, and a light chain having an amino acid sequence shown in SEQ ID NO: 48 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 48;(m) an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 171 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 171, and a light chain having an amino acid sequence shown in SEQ ID NO: 173 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 173; and(n) an anti-CDH17 antibody comprising a heavy chain having an amino acid sequence shown in SEQ ID NO: 175 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 175, and a light chain having an amino acid sequence shown in SEQ ID NO: 177 or an amino acid sequence having at least 80%sequence identity to SEQ ID NO: 177.12.The antibody or an antigen binding fragment thereof according to any of claims 1 to 11, wherein the antibody is a mono-specific antibody, a multi-specific antibody, an intact antibody, a human antibody, a humanized antibody or a chimeric antibody.13.The antibody or an antigen binding fragment thereof according to any of claims 1 to 12, wherein the antigen binding fragment is selected from a group consisting of Fab, Fab’, Fv, F (ab’) 2, scFv, di-scFv and dAb.14.An immunoconjugate, a pharmaceutically acceptable salt thereof, or a solvate thereof, comprising an antibody or an antigen binding fragment thereof according to any of claims 1 to 13, linked to an active agent; wherein the active agent is preferably a drug moiety or a label; wherein the label is preferably selected from the group consisting of a radiolabel, a fluorophore, a chromophore, an imaging agent, and a metal ion; and wherein the drug moiety is preferably selected from the group consisting of a cytotoxic agent, a cytokine, a nucleic acid, a nucleic acid-associated molecule, a radionuclide, a chemokine, an immuno (co) -stimulatory molecule, an immunosuppressive molecule, a death ligand, an apoptosis-inducing protein, a kinase, a prodrug-converting enzyme, a RNase, an agonistic antibody or antibody fragment, an antagonistic antibody or antibody fragment, a growth factor, a hormone, a coagulation factor, a fibrinolytic protein, peptides mimicking these, and fragments, fusion proteins and derivatives thereof.15.The immunoconjugate, a pharmaceutically acceptable salt thereof, or a solvate thereof, according to claim 14, wherein the immunoconjugate is an antibody-drug conjugate, and the active agent is the drug moiety, wherein the antibody drug conjugate has a formula of Ab- (L- (D) m) n, wherein Ab is the antibody or an antigen binding fragment thereof according to any of claims 1 to 11; L is a linker; D is the drug moiety; m is an integer from 1 to 8; and n is any number from 1 to 10.16.The immunoconjugate, a pharmaceutically acceptable salt thereof, or a solvate thereof, according to claim 15, wherein the L comprises: -Val‐Cit-PABC-, -Val‐Ala-PABC-, -Glu‐Val‐Cit‐PABC-, -Ala‐Ala‐Asn‐PABC-, -Gly-Val-Cit‐PABC-, -Gly-Gly-Gly‐PABC-, -Gly- Gly-Phe-Gly-PABC-, -Val‐Cit-PAB-, -Val‐Ala-PAB-, -Glu‐Val‐Cit‐PAB-, -Ala‐Ala‐Asn‐PAB-, -Gly-Val-Cit‐PAB-, -Gly-Gly-Gly‐PAB-or -Gly-Gly-Phe-Gly-PAB-; preferably, L is selected from a group consisting of:- (succinimidyl-3-yl-N) -CH2CH2-C (=O) -GGFG-PABC-;- (succinimidyl-3-yl-N) -CH2CH2CH2CH2CH2-C (=O) -GGFG-PABC-;- (succinimidyl-3-yl-N) -CH2CH2CH2CH2CH2-C (=O) -GGFG-NH-PABC-;- (succinimidyl-3-yl-N) -CH2CH2-C (=O) -NH-CH2CH2O-CH2CH2O-CH2CH2-C (=O) -GGFG-PABC-;- (succinimidyl-3-yl-N) -CH2CH2-C (=O) -NH-CH2CH2O-CH2CH2O-CH2CH2O-CH2CH2O-CH2CH2-C (=O) -GGFG-PABC-;-CH2-C (=O) -NH-CH2CH2-C (=O) -GGFG-PABC-;-C (=O) -CH2CH2CH2CH2CH2CH2-C (=O) -GGFG-PABC-;- (succinimidyl-3-yl-N) -CH2CH2-C (=O) -GGFG-NH-CH2CH2-C (=O) -;- (succinimidyl-3-yl-N) -CH2CH2-C (=O) -GGFG-NH-CH2CH2CH2-C (=O) -;- (succinimidyl-3-yl-N) -CH2CH2CH2CH2CH2-C (=O) -GGFG-NH-CH2CH2-C (=O) -;- (succinimidyl-3-yl-N) -CH2CH2CH2CH2CH2-C (=O) -GGFG-NH-CH2CH2CH2-C (=O) -;- (succinimidyl-3-yl-N) -CH2CH2CH2CH2CH2-C (=O) -GGFG-NH-CH2CH2CH2CH2CH2-C (=O) -;- (succinimidyl-3-yl-N) -CH2CH2CH2CH2CH2-C (=O) -GGFG-NH-CH2-O-CH2-C (=O) -;- (succinimidyl-3-yl-N) -CH2CH2CH2CH2CH2-C (=O) -GGFG-NH-CH2CH2-O-CH2-C (=O) -;- (succinimidyl-3-yl-N) -CH2CH2-C (=O) -NH-CH2CH2O-CH2CH2O-CH2CH2-C (=O) -GGFG-NH-CH2CH2CH2-C (=O) -;- (succinimidyl-3-yl-N) -CH2CH2-C (=O) -NH-CH2CH2O-CH2CH2O-CH2CH2-C (=O) -GGFG-NH-CH2CH2-C (=O) -;- (succinimidyl-3-yl-N) -CH2CH2-C (=O) -NH-CH2CH2O-CH2CH2O-CH2CH2O-CH2CH2O-CH2CH2-C (=O) -GGFG-NH-CH2CH2CH2-C (=O) -;- (succinimidyl-3-yl-N) -CH2CH2-C (=O) -NH-CH2CH2O-CH2CH2O-CH2CH2O-CH2CH2O-CH2CH2-C (=O) -GGFG-NH-CH2CH2-C (=O) -;-CH2-C (=O) -NH-CH2CH2-C (=O) -GGFG-NH-CH2CH2CH2-C (=O) -;-C (=O) -CH2CH2CH2CH2CH2CH2-C (=O) -GGFG-NH-CH2CH2CH2-C (=O) -;- (succinimidyl-3-yl-N) -CH2CH2-C (=O) -VA-PABC-;- (succinimidyl-3-yl-N) -CH2CH2CH2CH2CH2-C (=O) -VA-PABC-;- (succinimidyl-3-yl-N) -CH2CH2CH2CH2CH2-C (=O) -VA-NH-PABC-;- (succinimidyl-3-yl-N) -CH2CH2-C (=O) -NH-CH2CH2O-CH2CH2O-CH2CH2-C (=O) -VA-PABC-;- (succinimidyl-3-yl-N) -CH2CH2-C (=O) -NH-CH2CH2o-CH2CH2O-CH2CH2O-CH2CH2O-CH2CH2-C (=O) -VA-PABC-;-CH2-C (=O) -NH-CH2CH2-C (=O) -VA-PABC-;-C (=O) -CH2CH2CH2CH2CH2CH2-C (=O) -VA-PABC-;- (succinimidyl-3-yl-N) -CH2CH2-C (=O) -VA-NH-CH2CH2-C (=O) -;- (succinimidyl-3-yl-N) -CH2CH2-C (=O) -VA-NH-CH2CH2CH2-C (=O) -;- (succinimidyl-3-yl-N) -CH2CH2CH2CH2CH2-C (=O) -VA-NH-CH2CH2-C (=O) -;- (succinimidyl-3-yl-N) -CH2CH2CH2CH2CH2-C (=O) -VA-NH-CH2CH2CH2-C (=O) -;- (succinimidyl-3-yl-N) -CH2CH2CH2CH2CH2-C (=O) -VA-NH-CH2CH2CH2CH2CH2-C (=O) -;- (succinimidyl-3-yl-N) -CH2CH2CH2CH2CH2-C (=O) -VA-NH-CH2-O-CH2-C (=O) -;- (succinimidyl-3-yl-N) -CH2CH2CH2CH2CH2-C (=O) -VA-NH-CH2CH2-O-CH2-C (=O) -;- (succinimidyl-3-yl-N) -CH2CH2-C (=O) -NH-CH2CH2O-CH2CH2O-CH2CH2-C (=O) -VA-NH-CH2CH2CH2-C (=O) -;- (succinimidyl-3-yl-N) -CH2CH2-C (=O) -NH-CH2CH2O-CH2CH2O-CH2CH2-C (=O) -VA-NH-CH2CH2-C (=O) -;- (succinimidyl-3-yl-N) -CH2CH2-C (=O) -NH-CH2CH2O-CH2CH2O-CH2CH2O-CH2CH2O-CH2CH2-C (=O) -VA-NH-CH2CH2CH2-C (=O) -;- (succinimidyl-3-yl-N) -CH2CH2-C (=O) -NH-CH2CH2O-CH2CH2O-CH2CH2O-CH2CH2O-CH2CH2-C (=O) -VA-NH-CH2CH2-C (=O) -;-CH2-C (=O) -NH-CH2CH2-C (=O) -VA-NH-CH2CH2CH2-C (=O) -; and-C (=O) -CH2CH2CH2CH2CH2CH2-C (=O) -VA-NH-CH2CH2CH2-C (=O) -;more preferably, L is selected from the following structures:wherein n5 denotes an integer from 0 to 20, preferably 1 to 15; and even more preferably, L is selected from the following structures:in each structure, the wavy line to the left represents linkage site to the Ab moietyy, and the wavy line to the right represents linkage site to the D moiety.17.The immunoconjugate, a pharmaceutically acceptable salt thereof, or a solvate thereof, according to claim 15 or 16, wherein the drug moiety derives from a cytotoxic agent which is preferably a microtubule disrupting drug such as a tubulin inhibitor, or a DNA damaging agent such as a topoisomerase inhibitor including a topoisomerase I inhibitor such as camptothecin or a derivative thereof; preferably, the cytotoxic agent has a structure of 18.The immunoconjugate, a pharmaceutically acceptable salt thereof, or a solvate thereof, according to claim 17, wherein the antibody drug conjugate is selected from the following structures: wherein n is any number from 1 to 10, preferably, n is any number from 2 to 9.19.A nucleic acid molecule encoding the antibody or an antigen binding fragment thereof according to any of claims 1 to 13.20.An expression vector containing the nucleic acid molecule of claim 19.21.A non-human host cell containing the expression vector of claim 20.22.A pharmaceutical composition comprising the antibody or an antigen binding fragment thereof according to any of claims 1 to 13, or the immunoconjugate, a pharmaceutically acceptable salt thereof, or a solvate thereof, according to any of claims 14 to 18; and a pharmaceutically acceptable carrier.23.Use of the antibody or an antigen binding fragment thereof according to any of claims 1 to 13, or the immunoconjugate, a pharmaceutically acceptable salt thereof, or a solvate thereof, according to any of claims 14 to 18 in the preparation of a medicament for the treatment of cancer.