• Histologically confirmed gastric adenocarcinoma with no history of resection of primary or metastatic lesions

• Peritoneal metastases of gastric cancer requiring laparoscopy for definitive diagnosis without gastric outflow tract obstruction and intestinal obstruction

• Patients voluntarily enrolled in this study by signing an informed consent form

• Age ≥ 18 years

• Eastern Cooperative Oncology Group (ECOG) score ≤ 2,

• Expected life expectancy ≥ 3 months

• Adequate organ and bone marrow function

• Willingness to adhere to the study protocol and follow-up programme