The two groups were well balanced in terms of age, gender, ASA score, body mass index, Charlson comorbidity index, tumor location, tumor maximum diameter, tumor differentiation, pathological T stage, neural invasion, clinical tumor stage, vascular invasion, intraoperative blood loss, Her2 gene status, postoperative hospital stay, time to oral intake postoperatively, preoperative albumin level, preoperative hemoglobin level, preoperative aspartate aminotransferase level, and preoperative alanine aminotransferase level (Table 1). This evidence concerns the gene ERBB2 and neoplasm.