Cancer/testis antigens are typically restricted to gametes and trophoblasts in normal tissues but are aberrantly expressed in a range of human cancers.2, 3 Kita‐Kyushu lung cancer antigen‐1 (KK‐LC‐1), encoded by CT83 or Cxorf61 gene, has been characterized as a CT antigen. This evidence concerns the gene CT83 and cancer.