Fibroblast growth factor 9 (FGF9) was first isolated from the culture supernatant of the human glioma cell line NMC-G1 [1] and has been shown to participate in neuron development, bone formation, lens-fiber differentiation, gap-junction formation, sex determination, and steroidogenesis [2]–[8]. The gene discussed is FGF9; the disease is glioma.