The invention relates to the technical field of
biomedicine, in particular to a third-generation ALK TKI
drug loratinib
drug-
resistant cell strain as well as a construction method and application thereof, the
drug-
resistant cell strain is a loratinib-resistant human non-
small cell lung cancer cell strain H3122 LS and is preserved in Guangdong Microbial Culture Collection Center on July 25, 2025, and the preservation number is GDMCC No: 66760. According to the invention, an EML4-ALK fusion driven H3122
cell is treated by using a
third generation of ALK TKI loratinib, a
cell with high
drug resistance to loratinib is formed through induction, and it is found that the drug-
resistant cell loses EML4-ALK fusion variation. At present, the drug-resistant mechanism of the
ALK inhibitor is not clarified clinically, and the construction of the drug-resistant cell and the discovery of the drug-resistant mechanism are beneficial to guiding clinical discovery of a new potential drug-resistant mechanism; a new drug-resistant related driver
gene or
signal pathway is found, and an experimental basis is provided for subsequent
treatment strategy selection of a drug-resistant patient.