Furthermore, 14 of the identified genes (AGT, APOC1, APOE, AXIN2, CEACAM5, ERBB2, HSPA13, ID1, KLK12, MMP9, PPP1R1B, PTPRA, SERPINB5, and SMAD7) have previously been associated with malignant gastric tumors. Here, APOE is linked to gastric cancer.