RecruitingPhase 2Drug trialPhase II Study of the Combination of Durvalumab (MEDI4736) (PDL1 Inhibitor) and Olaparib (PARP Inhibitor) in Advanced Cholangiocarcinoma After Initial Chemotherapy and Durvalumab (BIL-PPP)The aim of this study is to investigate whether the combination of durvalumab and olaparib in the maintenance setting after initial chemotherapy and durvalumab will benefit patients with locally advanced or metastatic cholangiocarcinoma.