FGF23 and hypophosphatemia: In addition to ADHR and TIO, currently, many diseases have been characterized by hypophosphatemia with inappropriately high secretion of FGF23, collectively known as FGF23-related hypophosphatemia, such as X-linked or autosomal recessive hypophosphatemic rickets/osteomalacia (XLH/ARHR), McCune-Albright syndrome, and linear nevus sebaceous syndrome (Avitan-Hersh et al., 2014; Feng et al., 2006; Jonsson et al., 2003; Levy-Litan et al., 2010; Lorenz-Depiereux et al., 2010, Lorenz-Depiereux et al., 2006; Riminucci et al., 2003; Yamazaki et al., 2002).