Gastric Cancer Stage IV

In this study, the investigators will use LM-302 and S-1 plus intraperitoneal paclitaxel with or without Cadonilimab to treat Claudin 18.2-positive gastric or gastroesophageal junction adenocarcinoma with peritoneal metastasis.

In this phase 2 study, we combined Cadonilimab, LM-302, and S-1 combined with intraperitoneal infusion of paclitaxel as regimen to treat gastric cancer patients with peritoneal metastasis.

Pembrolizumab is a potent humanized immunoglobulin G4 (IgG4) monoclonal antibody (mAb) with high specificity of binding to the programmed cell death 1 (PD 1) receptor, thus inhibiting its interaction with programmed cell death ligand 1 (PD-L1) and programmed cell death ligand 2 (PD-L2). Olaparib is a potent PARP inhibitor (PARP1, 2, and 3) that is being developed as a monotherapy as well as for combination with chemotherapy, ionizing radiation, and other anti-cancer agents including novel agents and immunotherapy. Paclitaxel is widely used in breast, lung and gastric cancer with every 3-week or weekly cycle. Various targeted anticancer agents have been investigated with paclitaxel and combination with ramucirumab, a monoclonal anti-VEGFR2 antibody, was approved as a 2nd line treatment.

The purpose of the phase I/II study is to establish the safety of Combination of Irinotecan and paclitaxel with 5-FU, leucovorin, oxaliplatin and Tislelizumab.