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