In gastric cancer tumours, 66 (80.5%) out of 82 patients had expression of KK-LC-1, which was markedly higher than 22 (26.8%), 34 (41.5%), 17 (20.7%), 18 (22.0%), and 14 (17.1%) patients with MAGE-1, MAGE-A3, MAGE-A4, Synovial sarcoma, X break point 4 (SSX4), and New York esophageal squamous cell carcinoma-1 (NY-ESO-1) expression (Table 1). Here, MAGEA4 is linked to esophageal squamous cell carcinoma.