No pathological changes were found in pancreas of group C and other main organs (except pancreas) of group A and group B. No statistical differences were found among the positive rates of MGMT, ERCC1, hMSH2, and hMLH1 in ductal adenocarcinoma and non-cancerous pancreatic tissues of group A (P >0.05). This evidence concerns the gene ERCC1 and invasive ductal breast carcinoma.