Alveolar RMS (ARMS): balanced chromosomal translocations between chromosome 1 or 2 and chromosome 13, PAX3::FOXO1 and PAX7::FOXO1 gene fusionsEmbryonic RMS (ERMS): chromosomal gains and losses, alterations of RAS family genes. Here, PAX7 is linked to alveolar rhabdomyosarcoma.