In this study, patients with advanced gastric adenocarcinoma whose peritoneal metastasis and peritoneal nodule pathologically confirmed metastasis and/or exfoliative cytology were confirmed as the clinical stage of peritoneal metastasis, who had not received treatment before, were invited to participate in the study.To evaluate the surgical conversion rate and tumor regression grade (TRG grade) of patients with stage gastric cancer with peritoneal metastasis using docetaxel, oxaliplatin, fluorouracil (FLOT regimen) combined with teriprizumab (PD-1).