MUC4 and rhabdomyosarcoma: An example of this is the frequent coexpression of pankeratin and ALK in FET::TFCP2 fusion aggressive rhabdomyosarcomas [27] and the frequent expression of EMA and keratins (in addition to occasional ALK, MUC4, etc.)in FET::CREB fusion intra-abdominal neoplasms [11–14].