In this study, a plasma lipid metabolism index, PLMI, was constructed by 4 lipid variables (LDL-5 Apo-B, LDL-4 Cholesterol, HDL-4 Free Cholesterol, HDL-4 Apo-A2), that was capable of predicting survival for GC patients with gastrectomy. The gene discussed is APOB; the disease is gastric cancer.