This has been demonstrated for classical CTAs, such as the MAGE family members and the New York esophageal squamous cell carcinoma‐1 (NY‐ESO‐1, gene symbol: CTAG1B), by the detection of autoantibodies in the serum of patients with a variety of cancer types [30, 31]. Here, CTAG1B is linked to esophageal squamous cell carcinoma.