FGFR1 and rhabdomyosarcoma: FGFR1 amplification and elevated expression was reported in 3% of fusion‐negative rhabdomyosarcoma (FN‐RMS) patient samples and cell lines and in another study FGFR1 overexpression in patients was attributed to hypomethylation of CpG islands upstream of exon 1 [14, 15].