Liposomal Irinotecan Combination Regimen for Second-line Treatment of Advanced Gastric Cancer

This is a single-arm, single-center clinical study to evaluate the efficacy and safety of liposomal irinotecan combined with albumin paclitaxel regimen for second-line treatment of advanced gastric cancer. Using a "3+3" study design, 9 to 18 eligible patients with unresectable or locally advanced gastric cancer and gastroesophageal junction adenocarcinoma will receive liposomal irinotecan + albumin paclitaxel combination therapy. Three dose groups of liposomal irinotecan 50mg/m2, 60 mg/m2 and 70 mg/m2 were preset, and a fixed dose of albumin paclitaxel (150mg/m2, intravenous infusion, d1) was administered for one cycle. The dose of liposomal irinotecan was gradually increased from the low-dose group to the high-dose group, and DLT was observed for 2 weeks (the first cycle). The same subject received only one dose of liposomal irinotecan during the study. All subjects underwent protocol-mandated examinations during treatment to observe safety and initial efficacy. If the patient volunteers and the investigator determines that the benefits of continuing the original regimen outweigh the risks, the subject may continue to receive treatment for metastatic disease. The drug was repeated every 2 weeks for up to 6 cycles, and the albumin paclitaxel or liposomal irinotecan were withdrawn according to the patient's adverse reactions and physical status, and the remaining single-agent maintenance therapy was performed. Until there is a possibility of surgery, disease progression, intolerable toxicity or the patient withdraws informed consent (whichever comes first). Main study indicators: Maximum tolerated dose (MTD) of liposomal irinotecan in the combination regimen; Secondary study measures: dose-limiting toxicity (DLT) of liposomal irinotecan, objective response rate (ORR), disease control rate (DCR), progression-free survival (PFS), and overall survival (OS) .