Durvalumab With Chemotherapy as First Line Treatment in Patients With Advanced Biliary Tract Cancers (aBTCs)

This study involves assessing the safety and efficacy of durvalumab in combination with different gemcitabine-based chemotherapy regimens as first line therapy for aBTC. The target population of interest in this study is participants with aBTC who are ≥ 18 years of age and above legal age per local regulations with WHO/ECOG PS of 0 to 2 at enrolment and who are not eligible for locoregional therapy. Participants with WHO/ECOG PS 2 will be capped at 20% of the overall treated participant population. The study consists of 4 periods: screening period (Day-28 to Day -1), treatment period up to 8 cycles of gemcitabine-based chemotherapy regimens with durvalumab, maintenance treatment with durvalumab alone or in combination with gemcitabine-based chemotherapy (with the exception of paclitaxel), and then safety and survival follow-up.