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Journal of Clinical Endocrinology & Metabolism, Vol 42, 477-483, Copyright © 1976 by Endocrine Society

ARTICLES

Dose dependence of growth response to human growth hormone in growth hormone deficiency

MA Preece, JM Tanner, RH Whitehouse and N Cameron

A trial of the relative effect on growth of 20 IU/week and 10 IU/week of human growth hormone has been made in 38 patients with "isolated" growth hormone deficiency over 1 year of treatment, 18 patients over 2 years and 10 over 3 years, and in 17 patients with surgically treated craniopharyngiomata over 1 year. The velocity of height growth in the first year of treatment, compared with a full year of pre-treatment control, was 1.3 times as great in both groups of patients on the larger dose as it was in those on the smaller one. Second-degree equations fitted to the treatment catch-up curve gave estimates of 1.7 cm more height gained on the larger dose by the end of the first year, 2.7 cm by the end of the second, and 3.4 cm by the end of the third. Adjusting treatment increment by covariance for bone age at the beginning of treatment, pre-treatment velocity, and body surface area did not alter these mean differences. Bone age velocity during treatment was the same in both treatment groups (mean 1.09 "years"/year in the first year); thus we anticipate a gain in final adult height of the order of 10 cm from employing the larger dose. The decrease in skin folds occurring on treatment, however, was no different with the larger than with the smaller dose. This reinforces previous observations that the short-term metabolic and longer-term auxologic effects of hGH are not necessarily related.


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