A Trial to Assess the Safety and Efficacy of KRN23 in Epidermal Nevus Syndrome (ENS)

KRN23 is a fully human IgG1monoclonal antibody that binds to and inhibits the activity of FGF23, leading to an increase in serum phosphorus levels. It is a potential therapeutic candidate for the treatment of XLH, Tumor-Induced Osteomalacia (TIO), and the rickets/osteomalacia resulting from Epidermal Nevus Syndrome (ENS). All of these conditions are diseases of bone hypomineralization, caused by urinary phosphate wasting due to elevated levels of FGF23.