According to de Alava (13), the prognosis of EWS/FLI-1 fusion was superior to that of EWS/FLI-2, and their study also found that the fusion genotype t (11; 22) was associated with tumor prognosis, with EWS/FLI-1 positive prognosis being better in cases without metastasis. Here, EWSR1 is linked to neoplasm.