PAX3-FOXO1 and FGFR4 in alveolar rhabdomyosarcoma.    ///    PAX3-FOXO1 and FGFR4 in alveolar rhabdomyosarcoma..     ///    "However, we demonstrate that enhanced expression of FGFR4 does not contribute to inhibited differentiation, enhanced proliferation, or transformation downstream of PAX3-FOXO1 in primary mouse myoblasts. "    ///    "We hypothesized fibroblast growth factor receptor 4 (FGFR4) may act as an effector of PAX3-FOXO1, contributing to PAX3-FOXO1 tumorigenic phenotypes. "    ///    Therefore we were unable to identify any contribution of up regulation of wild type FGFR4 to PAX3-FOXO1 driven tumorigenesis.     ///    " We and others have identified FGFR4 as a direct transcriptional target of the alveolar rhabdomyosarcoma (ARMS) specific fusion protein, PAX3-FOXO1. "