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Current Dosing of Growth Hormone in Children with Growth Hormone Deficiency: How Physiologic?

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Current Dosing of Growth Hormone in Children with Growth Hormone Deficiency: How Physiologic? Current Dosing of Growth Hormone in Children With Growth Hormone Deficiency: How Physiologic? Margaret H. MacGillivray, MD*; Sandra L. Blethen, MD, PhD‡; John G. Buchlis, MD*; Richard R. Clopper, ScD*; David E. Sandberg, PhD*; and Thomas A. Conboy, MS* ABSTRACT. The current doses of recombinant growth ARE THE APPROVED RECOMBINANT HUMAN GH hormone (rGH) are two to three times those used in the DOSING REGIMENS PHYSIOLOGIC? pituitary growth hormone era. These rGH doses (0.025 to A standard method for determining whether hor- 0.043 mg/kg/d) are similar to or moderately greater than mone replacement is physiologic is to compare the the physiologic requirements. Growth velocity and dose of hormone administered with the amount of height gains have been shown to be greater with 0.05 that hormone produced daily in healthy persons. For mg/kg/d of rGH than with 0.025 mg/kg/d. Larger doses of human GH, this is not an easy task because of its GH and early initiation of treatment result in greater short half-life, multicompartmental distribution, and heights at the onset of puberty and greater adult heights. Earlier onset of puberty and more rapid maturation, as episodic pulsatile pattern of secretion. In addition, indicated by bone age, were not observed in children GH has a variable secretion profile that is influenced who were given 0.18 to 0.3 mg/kg/wk of rGH. The fre- by age, diurnal rhythm, sleep, stress, nutrition, body quency of adverse events is very low, but diligent sur- weight, and sex hormones. One approach to calcu- veillance of all children who are treated with rGH is lating daily levels of endogenously produced GH essential. Pediatrics 1998;102:527–530; growth hormone involves measuring the metabolic clearance rate of dose, height outcomes, bone age, onset of puberty. GH and the integrated or mean concentration of serum GH over time. An alternative method uses deconvolutional analysis of spontaneous GH pulses, ABBREVIATIONS. rGH, recombinant human growth hormone; which are identified by frequent measurements of GHD, growth hormone deficiency; pGH, pituitary growth hor- mone; GH, growth hormone; SDS, standard deviation score(s). serum GH in healthy children. Either approach is problematic because of the pulsatile nature of the secretion of GH and our inability to measure accu- n 1985, the recombinant human growth hormone rately the nadirs of GH pulses, owing to the limited (rGH) somatrem was approved by the Food and sensitivity of radioimmunoassays. Table 1 summa- Drug Administration at a dose of 0.3 mg/kg/wk rizes the estimated daily endogenous production of I m (0.9 IU/kg/wk) for the treatment of growth hormone GH; estimates range from 16 to 38 g/kg/d, depend- deficiency (GHD) in children. A second rGH, somat- ing on age, pubertal stage, and method of measure- ropin, was approved subsequently at a dose of 0.18 ment.2–8 Our current dosing regimens of rGH range m mg/kg/wk (0.64 IU/kg/wk). The current potency of from 25 to 43 g/kg/d. The highest dose of rGH rGH products is approximately 3 U per milligram, approximates the estimated secretion of GH in pu- based on the international rGH standard of the bertal children, and the lowest dose approximates World Health Organization. When patients were the amount of GH secreted in prepubertal children. treated with pituitary GH (pGH), the purity and Because the methods used to measure the endoge- potency of the extracted GH were not as well stan- nous production of GH have a significant margin of error, we may reasonably assume that current dosing dardized as they are today with rGH.1 The usual regimens of rGH provide replacement that is equal dose of pGH was 0.1 mg/kg/wk (0.3 IU/kg/wk), to or moderately greater than the physiologic re- which is approximately one third to half the dose of quirements. the rGH prescribed today for children with GHD. Similar doses of rGH are used to treat prepubertal The primary objectives of our study were to assess and pubertal children with GHD, but there is ample whether the current doses of rGH (0.18 to 0.3 mg/ evidence indicating that the doses given to children kg/wk) given to children with GHD are physiologic are not tolerated in adults with GHD. Many studies and to evaluate the efficacy and safety of current have confirmed that the production of GH peaks in treatment regimens. puberty and declines progressively after the second decade of life; the decrease in the production of GH has been reported to be 14% per decade of life.9 Consequently, the recommended doses of rGH for From the *Department of Pediatrics, State University of New York at adults with GHD are one third to one sixth of the Buffalo, and Children’s Hospital of Buffalo, Buffalo, New York; and amount prescribed for children with GHD, depend- ‡Genentech Inc, South San Francisco, California. This work was presented in part at the National Cooperative Growth Study ing on patient tolerance. Higher doses have been Eleventh Annual Investigators Meeting, September 25–28, 1997, Washing- associated with edema and carpal tunnel syndrome. ton, DC. Received for publication Feb 6, 1998; accepted Mar 20, 1998. DOES GH EFFICACY DEPEND ON DOSE? Address correspondence to Margaret H. MacGillivray, MD, Children’s Hospital, 219 Bryant St, Buffalo, NY 14222. In addition to the issue of physiologic replacement PEDIATRICS (ISSN 0031 4005). Copyright © 1998 by the American Acad- described above, we also investigated how doses of emy of Pediatrics. rGH impact on the growth responses of hypopitu- Downloaded from www.aappublications.org/news by guest on September 26, 2021 SUPPLEMENT 527 TABLE 1. Estimates of the Mean Daily Production of GH Authors No. Age (y) or Mean Endogenous Output of GH/d Tanner Stage mg/24 h mg/m2 mg/kg/d MacGillivray et al2 17 9–43 950.0 522.0 17.4 Finkelstein et al3 4 Prepubertal 91 — — 10 Pubertal 690 — — 9 Young adult 385 — — Kowarski et al4 4 32–37 950.0 585.0 19.5 Plotnick et al5 7 Prepubertal — 480 16.0 Martha et al6 11 Prepubertal 610.0 600.0 20.0 16 Late pubertal 1810.0 1160.0 38.0 7 Postpubertal 900.0 500.0 16.6 itary children.10 Many early studies suggested that twice as long to reach normal height and had more greater growth velocities were observed in children than twice as many treatment failures than did the with GHD who were given larger, nonstandardized children with GHD who were given a threefold doses of pGH. Frasier and associates were the first to higher dose of rGH (Table 2). It is likely that the carry out a dose–response study with pGH standard- benefits of rGH at a dose of 0.3 mg/kg/wk have ized for body weight in hypopituitary children.10 been underestimated, because the present analysis They reported a positive correlation between growth involves only older hypopituitary patients who had rate and the logarithm of the dose of pGH over a begun treatment in 1985 and who had achieved adult dose range of 0.09 to 0.3 IU/kg/wk, which approx- height. Data are lacking on younger patients who imates 0.03 to 0.1 mg/kg/wk of rGH. The highest have yet to reach final height. dose used in their study was one third of the usual The ultimate efficacy of treatment with GH in hy- dose of rGH currently used. popituitary children is determined from outcomes in Any study that seeks to assess the impact of doses adult height. Table 3 provides final heights in hypo- of rGH on growth velocity must select naive, young pituitary children who were treated exclusively or prepubertal children to avoid such important con- predominantly with rGH since 1985. The mean adult founding variables as the waning response to rGH heights in groups 1 to 4 ranged from 21.5 to 20.7 over time and the influence of sex steroids, which SDS.12–15 Final heights after treatment with rGH were have growth-promoting effects. Cohen and Rosen- significantly greater than those observed when pa- feld compared the growth responses in prepubertal, tients were treated with pGH (adult height range, naive children with GHD who were given 0.025, 0.05, 24.7 to 22.0 SDS).12,16–21 Such greater growth appears or 0.1 mg/kg/d of rGH over 2 years.11 Significantly to correlate with the higher doses of rGH used, the greater growth velocities and greater gains in cumu- continuity and duration of treatment, and possibly lative height standard deviation scores (SDS) re- the frequency of the injections of rGH.22,23 Among the sulted from 0.05 mg/kg/d of rGH than from 0.025 four studies noted in Table 3, the greatest final mg/kg/d during the 2 years of observation. Growth heights and the greatest gains in height SDS occurred velocity was no greater with the highest dose of rGH in hypopituitary patients who were treated with rGH (0.1 mg/kg/d) than with the 0.05 mg/kg/d dose. at a dose of 0.3 mg/kg/wk for a total of 6 to 8 years Yearly advancement of bone age was not signifi- (5.7 and 6.4 years for girls and boys, respectively, on cantly different among these three groups during the rGH therapy only). Less impressive height gains, 2-year study. Height SDS at the end of 2 years of although still favorable, were seen in children in treatment had significantly increased in the two group 3, all of whom had been given a lower dose of groups who had been given either 0.05 or 0.1 mg/ rGH (0.19 mg/kg/wk), as well as in children in kg/d of rGH (21.2 and 20.6 height SDS, respec- groups 2 and 4, all of whom had had shorter dura- tively) compared with that observed in those who tions of treatment.12–15 were treated with 0.025 mg/kg/d (22.0 height SDS).
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