MLH1 In Patients Research Articles

Study of germline mutation of hMSH2, hMSH6 and hMLH1 and methylation of hMLH1 in microsatellite instability colorectal cancer

To study the characteristics of germline mutations of hMLH1, hMSH2 and hMSH6 and promoter methylation status of MLH1 in patients with MSI colorectal cancer. Sequence analysis of germline mutation and promoter methylation of MLH1 in 34 prospective collected patients with MSI colorectal cancer were performed. Nineteen out of 34 patients with MSI colorectal cancer were detected with hypermethylation of MLH1,which accounted for 55.9%. 73.7% MSI-H colorectal cancer cases and 33.3% MSI-L colorectal cancer cases were detected with hypermethylation of MLH1 and the difference was significant. Eight germline mutations were found, including 3 MSH6 mutations and 5 MSH2 mutations. There are some different characteristics of the germline mutations of hMLH1, hMSH2 and hMSH6 and promoter methylation of MLH1 in Chinese MSI colorectal patients.