No significant differences were observed in gender, age, body weight, preoperative blood routine indexes, blood albumin levels, smoking and drinking history, cardiovascular and cerebrovascular history, diabetes history, family history of cancer, and blood tumor markers (alpha fetoprotein, carcinoembryonic antigen, cancer antigen 125, and cancer antigen 19–9) among the three groups of gastric cancer patients (P > 0.05). The gene discussed is AFP; the disease is diabetes mellitus.