DHX9 and Ewing sarcoma: Analysis of event-free survival and overall survival in a dataset comprising 64 Ewing sarcoma, 4 Askin, and 20 perypheral primitive neuroectodermal tumors [25], which all belong to the family of Ewing tumors, showed that high DHX9 expression correlates with worse prognosis of the patients (Figure 1A,B).