Exploring the Efficacy and Safety of Tislelizumab in Combination With S-1 in the Treatment of Patients With Postoperative Recurrent High-risk Intrahepatic Cholangiocarcinoma

Inclusion Criteria

• •18-75 years old, male and female;
• •Intrahepatic cholangiocarcinoma was pathologically confirmed after R0 or R1 resection. Patients were also pathologically confirmed to have one of the following high-risk factors (i.e., positive margins, multiple tumor nodes, positive lymph nodes, positive perineural infiltration, intrahepatic cholangiocarcinoma \>5 cm in diameter, and combined vascular invasion);
• •Enhanced computed tomography (CT) scans of the chest, abdomen, and pelvis were required within 30 days prior to surgery to demonstrate the absence of distant tumor metastases;
• •No history of any chemotherapy, radiotherapy, immunotherapy or interventional therapy within 3 months prior to surgical resection;
• •Child-Pugh grade A or B, ECOG score 0-1;
• •Normal organ function prior to drug administration: ANC ≥1.5×10\^9/L, Hemoglobin ≥90g/L, PLT \>50\*10\^9/L, serum creatinine (SCr) ≤ 1.5 times the upper limit of normal (ULN) or creatinine clearance ≥50 ml/min (Cockcroft-Gault formula); total bilirubin (TBIL) ≤2 times the upper limit of normal (ULN); glutamine transaminase (AST) or glutamine transaminase (ALT) levels ≤3 times the ULN; urinary protein \<2+ (if urinary protein) upper limit of normal (ULN); albumin transaminase (AST) or alanine transaminase (ALT) levels ≤3 times upper limit of normal (ULN); urine protein \<2+ (if urine protein ≥2+, 24-hour urine protein quantification must show ≤1g of protein); and adequate surgical biliary drainage with no signs of infection.
• •Normal coagulation function: a. International normalized ratio INR ≤ 1.5 x ULN; b. Partial thromboplastin time APTT ≤ 1.5 x ULN; c. Prothrombin time PT ≤ 1.5 ULN;
• •In case of hepatitis B virus (HBV) infection: if HBsAg-positive, HBV-DNA testing is required and HBV-DNA must be \<2000 IU/mL and willing to receive antiviral therapy throughout the study period; hepatitis C virus (HCV)-RNA-positive patients must have HCV-RNA \<1×10\^3copy/mL and must receive antiviral therapy according to treatment guidelines.
• •No major abnormalities in heart, lung or kidney function;
• •No history of gastrointestinal hemorrhage;
• •Sign the informed consent form.