Combination of Gemcitabine, Oxaliplatin, Sintilimab and Bevacizumab in Unresectable Biliary Tract Cancer

Study design: Prospective, single-arm, single-center phase II clinical study; Primary endpoint: Conversion rate; Secondary endpoints: Safety, disease control rate, disease-free survival, and overall survival; Main characteristics of enrolled patients: Patients with initially unresectable biliary tract cancer; Interventions: Combination of Gemcitabine, Oxaliplatin, Sintilimab and Bevacizumab; Sample size: 34 patients; Treatment until: 1. successfully conversed to resectable disease 2. progressed disease 3. intolerable toxicity 4. patient requests withdrawal; Research process: In this study, patients who met the inclusion criteria were evaluated at the end of every 3 weeks of treatment, up to surgical treatment or disease progression; Safety evaluation: Evaluate adverse reactions according to CTCAE 4.0; Follow up: 12 months after the last case was enrolled.