Abstract
Malignant tumors originating from bone tissue represent between 4% and 8% of childhood cancers, with Osteosarcoma (50%) and Ewing's Sarcoma (40%) being the most frequent. Osteosarcomas present several alterations, however few genes are recurrently mutated, such as TP53, RB1, CDKN2A, MYC, TGFB1. About 90% of Ewing Sarcomas present translocations involving the EWSR1 and FLI1/ERG family of g…