Fibroblast growth factor 23; FGF-23;

The "fibroblast growth factor 23" (FGF23) is a protein of the FGF family, which is responsible for the phosphate metabolism. Its synthesis takes place in bone tissue.

FGF23 has an inhibitory effect on calcitriol synthesis and renal phosphate absorption. This occurs through the inhibition of 1-alpha-hydroxylase and stimulation of 24-hydroxylase. In the rare FGF23-producing tumors(phosphaturic mesenchymal tumor), tumor-associated phosphaturia and consecutive osteomalacia occur.

1. Qari H (2016) Phosphaturic Mesenchymal Tumor: 2 New Oral Cases and Review of 53 Cases in the Head and Neck. Head and Neck Pathogen 10:192-200.