MLH1 and familial pancreatic carcinoma: Since no studies have examined the expression levels of DNA-repair proteins (MGMT, ERCC1, hMSH2, and hMLH1) in pancreatic cancer induced by DMBA and non-cancerous pancreatic cancer tissues in rats, little is known about the effects of MGMT, ERCC1, hMSH2, and hMLH1 on rat pancreatic cancer induced by DMBA.