1. Primary Objectives (1) To evaluate the safety and tolerability of sacituzumab tirumotecan in combination with pucotenlimab in patients with advanced cholangiocarcinoma; (2) To assess the objective response rate (ORR) of sacituzumab tirumotecan combined with pucotenlimab in patients with unresectable or metastatic cholangiocarcinoma, as evaluated by investigators per RECIST v1.1;
2. Secondary Objectives (1) To evaluate the overall survival (OS) of sacituzumab tirumotecan combined with pucotenlimab in advanced cholangiocarcinoma; (2) To assess progression-free survival (PFS), disease control rate (DCR), duration of response (DOR), and time to response (TTR) in patients treated with sacituzumab tirumotecan combined with pucotenlimab, as determined by investigators based on RECIST v1.1; (3) To further evaluate PFS (as a standalone secondary endpoint);
3. Exploratory Objectives (1) To investigate the correlation between TROP2 expression, systemic immune biomarkers, and treatment efficacy.