PAX3 and rhabdomyosarcoma: Fusion-positive rhabdomyosarcoma (FP-RMS)—RMS with t(2;13)(q35;q14) chromosomal translocation resulting in PAX3-FOXO1 fusion gene formation—seems to be regulated by CRC’, formed by PAX3-FOXO1, MYOD1, MYCN, and MYOG.