FGF23 and renal fibrosis: Fibroblast growth factor 23 (FGF-23) and its coreceptor, α-Klotho, are key factors in phosphate homeostasis, and their dysregulation is an essential link between osteodystrophy, left ventricular hypertrophy, atherosclerosis, systemic inflammation, and renal fibrosis observed in patients with ESKD (2).