NCI Dictionary of Cancer Terms
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Ewing sarcoma family of tumors (YOO-ing sar-KOH-muh FA-mih-lee ... TOO-mers)
A group of cancers that includes Ewing tumor of bone (ETB or Ewing sarcoma of bone), extraosseous Ewing (EOE) tumors, primitive neuroectodermal tumors (PNET or peripheral neuroepithelioma), and Askin tumors (PNET of the chest wall). These tumors all come from the same type of stem cell. Also called EFTs.