ctDNA in Genetic Profiling and Clinical Outcomes of Advanced Biliary Tract Cancer

Approximately 20 mL of peripheral blood will be collected from patients with advanced biliary tract cancer. Samples will be obtained prior to systemic therapy initiation (in about two-thirds of patients) or prior to subsequent therapy (in about one-third of patients). Additional blood draws may be performed at progression in patients with FGFR2 fusion, IDH1 mutation, or HER2 amplification. Collected samples will be centrally analyzed for genomic alterations using ctDNA profiling.