The fibroblast growth factor receptor (FGFR) family of receptor tyrosine kinases (RTKs) comprises four members (FGFR1, FGFR2, FGFR3, and FGFR4) that share significant sequence homology. This family of RTKs serves as high-affinity receptors for the fibroblast growth factors (FGFs) that control cell proliferation, apoptosis, and differentiation and are involved...