Growth parameters in children with achondroplasia: A 7-year, prospective, multinational, observational study.

Journal: Genetics In Medicine : Official Journal Of The American College Of Medical Genetics

Objective: This study was undertaken to collect baseline growth parameters in children with achondroplasia who might enroll in interventional trials of vosoritide, and to establish a historical control.

Methods: In this prospective, observational study, participants (≤17 years) underwent a detailed medical history and physical examination and were followed every 3 months until they finished participating in the study by enrolling in an interventional trial or withdrawing.

Results: A total of 363 children were enrolled (28 centers, 8 countries). Mean (SD) follow up was 20.4 (15.0) months. In participants <1 year, mean annualized growth velocity (AGV) was 11.6 cm/year for girls and 14.6 cm/year for boys. By age 1 year, mean AGV decreased to 7.4 cm/year in girls and 7.1 cm/year in boys. By age 10 years, mean AGV decreased to 3.6 cm/year for both sexes. Mean height z-score in participants <1 year was -2.5 for girls and -3.2 for boys and decreased up to the age 5 years (-5.3 for girls; -4.6 for boys). Girls and boys had a disproportionate upper-to-lower body segment ratio. Mean ratio was highest in participants aged <1 year (2.9 for girls; 2.8 for boys) and decreased gradually to approximately 2 in both sexes from 4 years of age onward.

Conclusions: This study represents one of the largest datasets of prospectively collected medical and longitudinal growth data in children with achondroplasia. It serves as a robust historical control to measure therapeutic interventions against and to further delineate the natural history of this condition.

Ravi Savarirayan, Melita Irving, Paul Harmatz, Borja Delgado, William Wilcox, John Philips, Natalie Owen, Carlos Bacino, Louise Tofts, Joel Charrow, Lynda Polgreen, Julie Hoover Fong, Paul Arundel, Ignacio Ginebreda, Howard Saal, Donald Basel, Rosendo Font, Keiichi Ozono, Michael Bober, Valerie Cormier Daire, Kim-hanh Le Quan Sang, Genevieve Baujat, Yasemin Alanay, Frank Rutsch, Daniel Hoernschemeyer, Klaus Mohnike, Hiroshi Mochizuki, Asako Tajima, Yumiko Kotani, David Weaver, Klane White, Clare Army, Kevin Larrimore, Keith Gregg, George Jeha, Claire Milligan, Elena Fisheleva, Alice Huntsman Labed, Jonathan Day
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