Fibroblast growth factor receptor 1 (FGFR1) is a known receptor of FGF23, and it was recently found that the fibronectin 1 (FN1)-FGFR1 fusion gene is present in 60% of PMT cases.     ///    "The aforementioned 36% of cases may reflect the presence of the FN1-FGFR1 fusion gene, as the FN1 promoter enhances FGFR1 expression. "