We selected nine proteins—NOSTRIN, GREM1, BAG2, OLFM4, TRIP6, IGFBP7, P3H3, LIPF, and MAGE-A9 based on their differential expression in the diffuse and intestinal subtypes and because they had not been studied in the diffuse and intestinal subtypes of gastric cancer. This evidence concerns the gene P3H3 and gastric cancer.