INTRODUCTION Ewing sarcoma (EwS) is an aggressive, poorly differentiated, human tumor characterized by a chromosomal translocation involving a member of the FET family of genes (FUS, EWSR1 and TAF15) and a member of the ETS family of transcription factors, with the EWSR1-FLI1 gene fusion the most common one (1). EwS genomes present low mutation rates with FET-ETS rearrangements as the dominant genetic aberration in the majority of tumors (2). Notably, the cell of origin of EwS is still a controversial field, although human mesenchymal stem cells (hMSCs) and human neural crest stem cells are the most accepted (35)
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