Circulating tumor DNA status and dynamics predict recurrence in patients with resected extrahepatic cholangiocarcinoma

Surgery is the only curative therapeutic option for resectable extrahepatic cholangiocarcinoma (eCCA), but recurrence is common, and prognosis is poor. There is an unmet clinical need for improved decision-making regarding adjuvant chemotherapy (ACT). Here we evaluated the usefulness of monitoring longitudinal circulating tumor DNA (ctDNA) for minimal residual disease (MRD) in patients of the STAMP trial, which compares the efficacy of adjuvant capecitabine (CAP) versus gemcitabine plus cisplatin (GemCis).