This is a single-arm, open-label and exploratory clinical study of PD-1 monoclonal antibody SHR-1210 combined with GEMOX regimen (gemcitabine combined oxaliplatin) in the treatment of advanced biliary malignancies.

In oder to observe and evaluate the efficacy and safety of PD-1 antibody SHR-1210 combined with GEMOX in the treatment of patients with advanced biliary malignant tumor (BTC),subjects with pathological confirmed biliary cancer, including intrahepatic bile duct carcinoma, extrahepatic bile duct carcinoma, and gallbladder carcinoma will be enrolled.

28 days as a treatment cycle, SHR-1210 3mg/kg and Gemcitabine 800 mg/m2 will be administered IV Q2W (D1 and D15 of a treatment cycle),and Oxaliplatin 85mg/m2 will be administered IV Q2W (D2 and D16 of a treatment cycle). PD-1 antibody combined chemotherapy will be used up to 6 cycles.SHR-1210 3mg/kg IV Q2W will be administered beyond 6 cycles chemotherapy until disease progression or un-tolerable toxicity.

Inclusion Criteria:

• Pathology confirmed biliary malignancy, including intrahepatic bile duct carcinoma, extrahepatic bile duct carcinoma, and gallbladder carcinoma.
• Age:18-75 years, male or female.
• The estimated survival period is more than 3 months.
• ECOG 0-1.
• There is at least one measurable lesion, according to the RECIST 1.1 standard.
• Patients has not been treated by oxaliplatin, gemcitabine and pd-1 / pd-l1 antibody.
• Patients who have been treated tegafur or capecitabine as adjuvant chemotherapy or first-line treatment may be selected.

Exclusion Criteria:

• There were concurrent malignant tumors, except for the cured skin basal cell carcinoma and cervical carcinoma in situ.
• Other drug clinical trials have been taken in four weeks.
• Patients with a history of central nervous system metastasis or central nervous system metastasis are known before the screening.
• Patients with a history of unstable angina.
• The urine routine indicated that the urine protein was greater than ++ and confirmed the 24-hour urine protein quantification >1.0 g.
• Have used immune-targeted therapy drugs.
• The patient had received a liver transplant.
• Having a history of chronic autoimmune diseases such as systemic lupus erythematosus.
• Having a history of immunodeficiency, or other acquired, congenital immunodeficiency diseases, or a history of organ transplantation;