Clinicopathologic Features of Sporadic Colorectal Cancer with MLH1/MSH2 Loss of Expression - Reduced Likelihood of Metastases

摘要

purpose This study was designed to determine the frequency of MMR defective sporadic colorectal cancer (CRC) by using immunohistochemistry and to investigate the correlation between the MMR status and the metastatic potential. Methods The study included 249 patients with sporadic colorectal cancer who underwent surgical resection. The MMR status was determined by using an immunohistochemical analysis of MLH1 and MSH2 expression. Results Twenty seven (10.8%) carcinomas showed abnormal MMR protein expression (18 MLH1 negative and 9 MSH2 negative) and were classified as MMR defective tumors whereas 222 tumors demonstrated normal MLH1/MSH2 immunoreactivity (MMR intact tumor). MMR defective tumors developed at significantly higher frequencies in a proximal site (59.3% vs. 27.5%, P=0.001) and tended to be larger in size (6.3±2.4 cm vs. 5.1±2.1 cm, P=0.026). They showed significantly lower overall stage, N stage, and M stage at the time of diagnosis (P=0.002, P=0.014, P=0.010, respectively). In patients who had MMR defective tumors, lymphocytic infiltration (40.7% vs. 8.7%, P Conclusions mmunohistochemical analysis revealed that 10.8% of sporadic CRC cases showed no staining for MLH1 or MSH2. Lymphatic invasion and distant metastases were found at lower rates in these MMR defective tumors.