EWSR1 and desmoplastic small round cell tumor: Subsequent studies showed that EWSR1 is fused to various types of transcription factors in multiple sarcomas (e.g., EWSR1-WT1; desmoplastic small round cell tumor, EWSR1-ATF1;clear cell sarcoma, EWSR1-CHOP; myxoid liposarcoma, EWSR1-NR4A3; extraskeletal myxoid chondrosarcoma) (Lee et al., 1997; Panagopoulos et al., 2002; Matsui et al., 2006; Filion et al., 2009).