- Histologically-confirmed, locally unresectable or metastatic biliary tract (bile ducts, hepatic duct, cystic duct, common bile duct, ampulla of Vater) or gallbladder adenocarcinoma. Patients must have at least one measurable lesion greater than 1 cm, by Response Evaluation Criteria in Solid Tumors (RECIST) criteria outside of prior radiation field.