EWSR1 and Ewing sarcoma: Interestingly, regardless of tumour site, stage, or size, the survival rate of Ewing's sarcoma patients with type I EWS-Fli-1 fusion is markedly better than those in whom Ewing's sarcoma carries other types of EWS-Fli-1 fusions (Zoubek et al, 1996; de Alava et al, 1998; Lin et al, 1999).