In order to validate our mass spectrometric findings, we performed IHC using antibodies directed against these nine proteins—NOSTRIN, GREM1, BAG2, OLFM4, TRIP6, IGFBP7, P3H3, LIPF, and MAGE-A9 in both the subtypes on TMAs containing a total of 108 cases of intestinal subtype of gastric cancer and 16 cases of the diffuse subtype of gastric cancer. The gene discussed is MAGEA9; the disease is gastric cancer.