The robust expression of NY‐ESO‐1 in synovial sarcoma has also been proposed as a marker to differentiate synovial sarcoma from other spindle cell neoplasms, in which NY‐ESO‐1 expression is rare such as leiomyosarcoma, cellular schwannoma and dermatofibrosarcoma protuberans.32, 33. Here, CTAG1B is linked to leiomyosarcoma.