Safe and persistent growth-promoting effects of vosoritide in children with achondroplasia: 2-year results from an open-label, phase 3 extension study


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Savarirayan R., Tofts L., Irving M., Wilcox W. R. , Bacino C. A. , Hoover-Fong J., ...More

GENETICS IN MEDICINE, vol.23, no.12, pp.2443-2447, 2021 (Journal Indexed in SCI) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 23 Issue: 12
  • Publication Date: 2021
  • Doi Number: 10.1038/s41436-021-01287-7
  • Title of Journal : GENETICS IN MEDICINE
  • Page Numbers: pp.2443-2447

Abstract

Purpose Achondroplasia is caused by pathogenic variants in the fibroblast growth factor receptor 3 gene that lead to impaired endochondral ossification. Vosoritide, an analog of C-type natriuretic peptide, stimulates endochondral bone growth and is in development for the treatment of achondroplasia. This phase 3 extension study was conducted to document the efficacy and safety of continuous, daily vosoritide treatment in children with achondroplasia, and the two-year results are reported. Methods After completing at least six months of a baseline observational growth study, and 52 weeks in a double-blind, placebo-controlled study, participants were eligible to continue treatment in an open-label extension study, where all participants received vosoritide at a dose of 15.0 mu g/kg/day. Results In children randomized to vosoritide, annualized growth velocity increased from 4.26 cm/year at baseline to 5.39 cm/year at 52 weeks and 5.52 cm/year at week 104. In children who crossed over from placebo to vosoritide in the extension study, annualized growth velocity increased from 3.81 cm/year at week 52 to 5.43 cm/year at week 104. No new adverse effects of vosoritide were detected. Conclusion Vosoritide treatment has safe and persistent growth-promoting effects in children with achondroplasia treated daily for two years.