According to the type of genomic alteration, STSs can be classified into two main categories: (i) recurrent translocation-driven STSs, where reciprocal chromosomal translocations result in oncogenic fusion transcripts such as PAX3-FOXO1 in alveolar RMS (ARMS), SS18-SSX in SS, FUS-CHOP in myxoid/round-cell LPS, and (ii) non-translocation driven STSs characterized by complex genetic changes such as amplifications/deletions in various chromosomal regions as observed in embryonal RMS (ERMS), FS, LMS, LPS and MPNSTs (39). This evidence concerns the gene FOXO1 and alveolar rhabdomyosarcoma.