RecruitingPhase 2Drug trialPhase Ⅱ Clinical Study of Surufatinib Combined With Gemcitabine and Cisplatin Plus Durvalumab/Pembrolizumab Regimen in the Treatment of Advanced Biliary Tract CancerThis phase II trial studies how well gemcitabine, cisplatin and durvalumab/Pembrolizumab and surufatinib work in treating participants with advanced Biliary Tract Cancer. The international multicenter phase III clinical study TOPAZ-1 has confirmed that durvalumab combined with gemcitabine and cisplatin can bring survival benefits to advanced BTC. Whether if adding surufatinib to a standard of care can bring addition benefit needs to be explored.