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TeachMeFinance.com - explain Ewing's family of tumors Ewing's family of tumors EFTs. A group of cancers that includes Ewing's tumor of bone (ETB or Ewing's sarcoma of bone), extraosseus Ewing's (EOE) tumors, primitive neuroectodermal tumors (PNET or peripheral neuroepithelioma), and Askin's tumors (PNET of the chest wall). These tumors all come from the same type of stem cell. About the author Mark McCracken Author: Mark McCracken is a corporate trainer and author living in Higashi Osaka, Japan. He is the author of thousands of online articles as well as the Business English textbook, "25 Business Skills in English". Copyright © 2005 by Mark McCracken, All Rights Reserved. TeachMeFinance.com is an informational website, and should not be used as a substitute for professional medical, legal or financial advice. Information presented at TeachMeFinance.com is provided on an "AS-IS" basis. Source of definition: The National Cancer Institute. Please read the disclaimer for details.