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  • Title: Final height in idiopathic growth hormone deficiency: the KIGS experience. KIGS International Board.
    Author: Cutfield W, Lindberg A, Albertsson Wikland K, Chatelain P, Ranke MB, Wilton P.
    Journal: Acta Paediatr Suppl; 1999 Feb; 88(428):72-5. PubMed ID: 10102057.
    Abstract:
    Final height was evaluated in 369 patients with idiopathic growth hormone deficiency (IGHD) enrolled in KIGS--the Pharmacia & Upjohn International Growth Database. At the start of growth hormone (GH) therapy, the patients were 9.8 years of age, their mid-parental height SDS was -0.8, and their height SDS was -3.1. Of the 369 patients, 50% had multiple hormone deficiencies, and puberty was induced in 31%. Patients were 18 years of age at completion of GH therapy, and had received GH at a dose of 0.49 IU/kg/week (0.16 mg/kg/week), with a mean of 5.2 injections/week for 8.1 years. Final height SDS was -1.5, final minus initial height SDS was 1.7 and final minus mid-parental height SDS was -0.5. A Swedish subgroup (n = 69) received conventional GH therapy throughout at 0.65 IU/kg/week (0.22 mg/kg/week), with seven injections/week for a mean of 9.4 years. These patients achieved their genetic potential (final minus mid-parental height SDS, 0.03), with a normal final height SDS of -0.3. For the total group, the following variables were associated with final height: mid-parental height SDS (r = 0.62), injection frequency (r = 0.37), duration of GH treatment (r = 0.28), peak stimulated GH concentration (r = -0.25), age (r = -0.19) (all p < 0.001) and height velocity SDS in the first year of treatment (r = 0.20, p = 0.004). In conclusion, genetic potential, expressed as the mid-parental height, is the variable with the greatest identified influence on final height during GH treatment in IGHD. Current GH regimens will lead to a normal height and attainment of mid-parental height. However, higher dose, individualized GH regimens are likely to be necessary for patients with IGHD who are disadvantaged at the time of commencing GH therapy, such as those with short parents, those whose treatment began in late childhood or adolescence and those with less severe GHD.
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