ctDNA Detection of MRD in Predicting Postoperative Recurrence in Biliary Tract Cancers：A Multicenter Prospective Trial.

A substantial proporation of patients with biliary tract malignancies still experience disease recurrence after curative resection. ctDNA-based minimal residual disease (MRD) method has been widely used to monitor postoperative recurrence in solid cancers, but few studies have been reported in biliary tract cancers.The present clinical trial aims to elucidate the correlation between the postoperative ctDNA status and the prognosis of patients with biliary tract cancers, and evaluate whether ctDNA could better predict patients' recurrence and guide clinical practice.

Inclusion Criteria:Male or female ≥ 18 years of age on the day of signing informed consent.Clinically diagnosed as BTC before surgery and confirmed by pathology after surgery.Stage I-III tumor according to the UICC/AJCC TNM staging system (8th edition in 2017), meeting the indications for radical surgery and are planned to undergo radical treatment. Those who do not undergo radical surgery will be excluded.Patients must have a performance status of ≤1 on the ECOG Performance Scale.Patients must have survival of > 6 months after surgerySerological tumor indicators (CEA, CA19-9) and imaging data ( CT and/or MRI, PET-CT) were complete.Blood biochemical indicators meet surgical standardsWritten informed consent must be obtained from patient or patient's legal representative and ability for patient to comply with the requirements of the study.Exclusion Criteria:Patients with recurrent biliary tract tumorsPatients with hepatobiliary mixed tumorsPatients with malignant tumors of other organs that have not been cured before.History of organ transplant or allogeneic stem cell transplantPatients with severe infections that are active or poorly controlled clinicallypatients who are cognitively impaired or with known psychiatric disorders, and/or substance abusepregnant or lactating womenFailed to sign informed consentOther conditions that researchers judged inappropriate for inclusion