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A Study of Atezolizumab With or Without Bevacizumab in Combination With Cisplatin Plus Gemcitabine in Patients With Untreated, Advanced Biliary Tract Cancer
标题(英文)
A Study of Atezolizumab With or Without Bevacizumab in Combination With Cisplatin Plus Gemcitabine in Patients With Untreated, Advanced Biliary Tract Cancer
干预
Drug: Atezolizumab|Drug: Bevacizumab|Other: Placebo|Drug: Cisplatin|Drug: Gemcitabine