Detailed histologic observations were performed on the head of the pancreas of hamsters treated with 10 mg/kg body weight /V-nitrosobis(2-oxo-propyl)amine (BOP) once a week for 6 weeks with or without cholecystectomy. Cholecystectomy was performed 5 weeks before starting BOP initiation. The incidence of head cancers was 100% and cholecystectomy did not affect pancreatic carcinogenesis by BOP. Common bile duct dilatation was produced by advanced pancreatic head carcinomas and microadenocarcinomas in common duct. Micro-adenocarcinomas were not macroscopically detected since the tumors were located in the lumen of common duct.
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