Efficacy and Safety of Irinotecan Liposome Injection Combined With 5-FU/LV± Immunotherapy in First-line Gemsitabine + Immunoprogressive Patients With Metastatic Biliary Tract Cancer

The recommended dose and regimen of Irinotecan Hydrochloride Liposome Injection is 70 mg/m2 intravenously over 90 minutes, followed by dl-LV 400mg/m2 or l-LV 200mg/m2 intravenously over 30 minutes, followed by 5-FU 2400 mg/m2 intravenously over 46 hours, administered every 3 weeks.It can be combined or partially combined immunotherapy.