Circulating free DNA (cfDNA) and tissue next-generation sequencing analysis in a phase II study of infigratinib (BGJ398) for cholangiocarcinoma with FGFR2 fusions.

579Background: Fibroblast growth factor receptor 2 (FGFR2) alterations occur in 11% of cholangiocarcinomas, 85% of which are fusions. A multicenter, open-label, phase II study is currently evaluati...