Hyperphosphatemic familial tumoral calcinosis type 1–3 (HFTC) is characterized by hyperphosphatemia, normal or high calcitriol levels, and phosphate retention [11]. It is due to loss of function mutation in the gene encoding GALNT3 (type I), FGF23 (type II), and αKlotho (type III) ultimately causing FGF23 deficiency or resistance to FGF23 [11]. This evidence concerns the gene FGF23 and hyperphosphatemia.