An Open-label Randomized Trial of the Efficacy and Safety of Zanidatamab With Standard-of-care Therapy Against Standard-of-care Therapy Alone for Advanced HER2-positive Biliary Tract Cancer

Inclusion Criteria 1. Histologically- or cytologically-confirmed Biliary Tract Cancer (BTC), including Gallbladder Cancer (GBC), Intrahepatic Cholangiocarcinoma (ICC), or Extrahepatic Cholangiocarcinoma (ECC). 2. Locally advanced unresectable or metastatic BTC and not eligible for curative resection, transplantation, or ablative therapies. 3. Received no more than 2 cycles of systemic therapy which is limited to Cisplatin and Gemcitabine (CisGem) with or without a PD-1/L1 inhibitor (physician's choice of durvalumab or pembrolizumab, where approved under local regulations) for advanced unresec…