Trastuzumab Completed Phase 2 Trials for Neoplasms, Malignant / Recurrent Extrahepatic Bile Duct Cancer / Recurrent Gallbladder Cancer / Adenocarcinoma of the Extrahepatic Bile Duct / Unresectable Gallbladder Cancer / Adenocarcinoma of the Gallbladder / Unresectable Extrahepatic Bile Duct Cancer Treatment