FGFR4 and Ewing sarcoma: This included FGFR1 amplification in RMS (n = 3), Ewing sarcoma (ES; n = 2), OS (n = 1) and a sarcoma other (n = 1); FGFR3 amplification in a CNS tumour (n = 1); and FGFR4 amplification in RMS (n = 3).