EWSR1 and synovial sarcoma: In the same paper, another peptide derived from SYT-SSX in synovial sarcoma and a peptide derived from EWS-ATF1 in clear cell sarcoma were found to bind HLA-B27, while a peptide from EWS-WT1 in desmoplastic small round cell tumor was found to bind HLA-A3 [30].