The data included 8 cases of right hemicolon cancer, 23 cases of left hemicolon cancer, 15 cases of rectum cancer, 40 cases of moderately or well differentiated adenocarcinoma, 4 cases of poorly differentiated adenocarcinoma, 2 cases of mucinous adenocarcinoma, 4 cases of liver metastasis, 4 cases of lung metastasis, 8 cases of PM, and 8 cases of KRAS gene mutation. The gene discussed is KRAS; the disease is rectal cancer.