CT83 and esophageal squamous cell carcinoma: The latter group covers a number of potential targets such as melanoma-associated antigen 1 (MAGE-A1), New York esophageal squamous cell carcinoma 1 (NY-ESO-1), and Kita-Kyushu lung cancer antigen 1 (KK-LC-1), that are normally restricted to germline tissue but overexpressed in cancer 51, 52.