• (1) Newly treated patients who did not receive chemotherapy, radiotherapy or other antitumor therapy before the start of the clinical trial;(2) Aged 18-80 years;(3) male or non-pregnant or lactating female;(4) Gastric adenocarcinoma was pathologically confirmed, and laparoscopic (robotic) radical gastrectomy was planned;(5) Patients with T stage T3 or above, no distant metastasis, and feasible criteria for laparoscopic D2 radical resection (AJCC Eighth edition);(6) The estimated survival time is more than 6 months;(7) History of nonabdominal surgery (except laparoscopic cholecystectomy);(8) The bone marrow reserve function was good, and the blood routine met the following conditions: white blood cell count ≥3.5×109/L, neutrophil ≥1.5×109/L, platelet count ≥100×109/L, hemoglobin ≥90g/L;(9) Organ function was good, and biochemical examination met the following conditions: ALT≤2.5× upper limit of normal value (ULN), AST≤2.5×ULN, serum total bilirubin ≤1.5×ULN, serum creatinine ≤1.5×ULN;(10) Functional status: 0-1 (ECOG);(11) Preoperative ASA grade I-III;(12) Voluntarily sign the informed consent.