Summary
The purpose of this study is to evaluate the efficacy and safety of Zanidatamab plus
CisGem (Cisplatin and Gemcitabine) with or without the addition of a programmed death
protein 1/ligand-1 (PD-1/L1) inhibitor (physician's choice of either Durvalumab or
Pembrolizumab, where approved under local regulations) as first line of treatment for
participants with human epidermal growth factor receptor 2 (HER2)-positive biliary tract
cancer.