EWSR1 and clear cell sarcoma: In addition to EWS-ETS fusion genes, EWS is fused to other transcription factors in different sarcomas: EWS/DDIT3 is expressed in myxoid liposarcoma, EWS/ATF1 or EWS/CREB is expressed in clear cell sarcoma, EWS/WT1 or EWS/ERG is expressed in desmoplastic round cell sarcoma, and EWS/NR4A3 is expressed in extraskeletal myxoid chondrosarcoma4.