Background/aims: Hypochondroplasia (HCH) is a skeletal dysplasia characterized by disproportionate short stature. The aims of the study are to evaluate efficacy and safety of recombinant human growth hormone (r-hGH) therapy in HCH children, when compared with a historical cohort of untreated HCH children.
Methods: Nineteen HCH patients with an initial height standard deviation score (SDS) ≤-2 and a mean age of 9.3 ± 3.1 years were treated with a mean r-hGH dose of 0.053 mg/kg/day over 3 years. Growth charts were derived from the historical cohort (n = 40).
Results: Height gain in the treated population was +0.62 ± 0.81 SDS greater than in the general population, and +1.39 ± 0.9 SDS greater than in the historical untreated HCH cohort (mean gain of 7.4 ± 6.6 cm gain). A negative correlation between height gain and age at treatment initiation was reported (p = 0.04). There was no significant difference in response between patients with fibroblast growth factor receptor 3 mutations and those without. No treatment-related serious adverse events were reported.
Conclusions: r-hGH treatment is well tolerated and effective in improving growth in HCH patients, particularly when started early. The treatment effect varies greatly and must be evaluated for each patient during treatment to determine the value of continued therapy.
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