<qa>  What is the evaluation parameters for the perioperative clinical efficacy of gastric cancer?A prospective randomized comparison of laparoscopic spleen-preserving No. 10 lymph node dissection for gastric cancer will be performed, to evaluate the short-term, long-term and oncological outcomes. The evaluation parameters are perioperative clinical efficacy, postoperative life quality, immune function and 3-year survival and recurrence rates. 