DISEASE CHARACTERISTICS: Histologically proven malignant bile duct obstruction with obstructive jaundice Primary carcinoma of bile duct, gallbladder, or pancreas OR Metastatic bile duct disease Successful insertion of a percutaneous drain or endoscopic stent Unresectable disease OR Resectable disease but refusal of surgery Prior biliary plastic or metallic stent allowed, if requiring stent replacement due to recurrent jaundice or routine plastic stent change No erosion of biliary tumors into major blood vessels No evidence of bile duct perforation