Advances in molecular biology have revealed common chromosomal translocations such as EWS-FLI-1 among Ewing’s sarcoma (Ewing’s sarcoma of the bone and extraosseous Ewing’s sarcoma) and related diseases, such as primitive neuroectodermal tumor (PNET) and Askin’s tumor [2]. This evidence concerns the gene EWSR1 and primitive neuroectodermal tumor.