EWSR1 and Ewing sarcoma: Recently, CSCs were identified in the closely related Ewing sarcoma, which like DSRCT is characterized by chromosomal translocations involving EWSR1 (most commonly the EWSR1-FLI1 translocation) (Suva et al., 2009; Awad et al., 2010; Hotfilder et al., 2018).