Following factors of matched patients in LG were similar to that of SG: sex, mean age, tumor location, histological type, lymphovascular invasion, number of lymph nodes retrieval, lymph node metastasis, CEA level, CA19-9 level, surgical procedure, postoperative complications and postoperative adjuvant chemotherapy. This evidence concerns the gene CEACAM5 and metastatic malignant neoplasm in the lymph nodes.