Systemic therapy with pemigatinib and sintilimab followed by resection for recurrent FGFR-2-positive intrahepatic cholangiocarcinoma: a case report - Yang, Yuchen; Li, Jingfeng; Ma, Di; Hao, Fengjie; Li, Weixia; Xie, Jing; Qian, Lihan; Wang, Junqing; Chen, Yongjun (Frontiers in Oncology, 2025)