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

Tislelizumab：200mg q3w iv , lasts for one year. S-1：40mg, 50mg, or 60mg orally twice daily for 4 weeks, depending on body surface area, followed by 2 weeks of rest，lasts four cycles.