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Methods and tools for discriminating colorectal adenomas and adenocarcinomas

A technology for colorectal adenoma and rectal adenocarcinoma, which is applied in the field of tumor diagnosis and can solve problems such as microsatellite instability

Inactive Publication Date: 2010-05-19
基督教高等教育科学研究及病人护理协会
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

DNA mismatch repair deficiency leading to microsatellite instability (abbreviated MIS or MIN) has been most extensively studied (di Pietro et al. (2005) Gastroenterology, 129, 1047-1059), but only explains about 15% of Adenoma progresses to adenocarcinoma

Method used

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  • Methods and tools for discriminating colorectal adenomas and adenocarcinomas
  • Methods and tools for discriminating colorectal adenomas and adenocarcinomas
  • Methods and tools for discriminating colorectal adenomas and adenocarcinomas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0197] Example 1: Determination of differentially expressed genes in microarrays

[0198] Select a tumor sample

[0199] Seventy-three snap-frozen colorectal tumors (37 non-progressed adenomas and 36 carcinomas) were prospectively harvested at the VU-University Medical Center (VUmc) in Amsterdam, The Netherlands. All samples were used according to the regulations of the ethics committee.

[0200] The 73 frozen specimens corresponded to 65 patients (31 females and 34 males). Of these patients, 6 patients had multiple tumors: 4 patients had multiple adenomas and 2 patients had one or more adenomas adjacent to carcinoma. The mean age of the patients was 69 years (range, 47-89 years).

[0201] Array-CGH and expression microarrays were performed on cryo equipment.

[0202] RNA isolation

[0203] RNA was isolated from snap-frozen tissues using TRIzol reagent (Invitrogen, Breda, NL) according to the supplier's instructions. RNA and DNA concentration and purity were measured in ...

Embodiment 2

[0216] Example 2: Integration of expression data and CGH analysis

[0217] To investigate the effect of chromosomal instability on gene expression during colorectal adenoma progression to adenocarcinoma, a series of 114 colorectal tumors (37 non-progressed adenomas, 41 progressive adenomas (malignant polyps) and Genome-wide copy number alterations were analyzed by array-CGH on 36 cancers.

[0218] The determination of the SROs disclosed in the present invention is described in detail here for the chromosome gain region on 20q. For 41 progressive adenomas, the adenoma and adenocarcinoma components were analyzed for DNA copy number changes. Deletions of 1p, 4, 8p, 14q, 15q, 17p, and 18 and gains of 1q, 6p, 7, 8q, 13q, 17q, 19p, 20q, and 22q were observed in >20% of cases, with deletions of 8p and 18 And 13q and 20q gains are the most frequent, occurring in more than 35% of cases. Gain of a lone chromosome 20 occurs in more than 60% of cases. Genome-wide, in progressive adeno...

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Abstract

The present invention relates to the differential expression of genes in colorectal adenoma and adenocarcinoma cells and their correlation with chromosomal aberrations. The present invention provides tools for detecting chromosomal aberrations linked to progression of adenomas into adenocarcinoma cells. The present invention discloses methods and tools for in vivo and in vitro diagnosis of colorectal tumours.

Description

field of invention [0001] The present invention relates to methods for the diagnosis of tumors, more particularly for the diagnosis of colorectal adenomas and adenocarcinomas. The invention further provides marker genes, probes and arrays for performing these methods. Background of the invention [0002] Cancer of the colorectal portion of the gastrointestinal tract is a common condition. In the first stage, a benign tumor (adenoma) develops, which can transform into a malignant cancer (adenocarcinoma). Not all adenomas progress to adenocarcinoma. Indeed, this progression to adenocarcinoma occurs only in a small subset of tumors. The initiation of genomic instability is a critical step and occurs in two ways in colorectal cancer (Lengauer et al. (1998) Nature, 396, 643-649). DNA mismatch repair deficiency leading to microsatellite instability (abbreviated MIS or MIN) has been most extensively studied (di Pietro et al. (2005) Gastroenterology, 129, 1047-1059), but only ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/574
CPCG01N33/57419
Inventor G·A·梅杰B·平托莫雷斯德卡瓦尔霍
Owner 基督教高等教育科学研究及病人护理协会
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