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>Long-term safety in adults with X-linked Hypophosphatemia (XLH) treated with Burosumab, a fully human monoclonal antibody against FGF23: Final results of a phase 3 trial
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Long-term safety in adults with X-linked Hypophosphatemia (XLH) treated with Burosumab, a fully human monoclonal antibody against FGF23: Final results of a phase 3 trial
Burosumab, a fully human IgG1 monoclonal antibody to FGF23, is approved in Canada and Brazil to treat XLH in patients ≥1 year of age and in the US to treat XLH in patients ≥6 months of age. Burosumab has also received conditional marketing authorization in Europe to treat XLH with radiographic evidence of bone disease in children ≥1 year of age and in adolescents with growing skeletons. Burosumab significantly improved serum phosphorus, fracture/pseudofracture healing, stiffness, and physical functioning in a phase 3, double-blind, multicenter study (CL303, NCT02526160). In this trial, adult subjects with XLH were randomized 1:1 to receive burosumab or placebo subcutaneously every 4 weeks. At Week 24, subjects in the placebo group crossed over to receive burosumab (total duration ≥96 weeks). Here, we report final long-term safety results from this trial.
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