Superior survival benefits of triple combination immunotherapy compared to standard chemotherapy as second-line treatment for advanced biliary tract cancer: a retrospective analysis - Shang, Peipei; Xu, Heming; Zeng, Tianmei; Lou, Cheng; Wei, Wei; Yang, Guang; Cheng, Zhuo; Cui, Xiaowen; Hong, Weipeng; Shen, Weidong; Lian, Zhicong; Yuan, Zhengang (Frontiers in Oncology, 2024)