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      Growth Hormone Treatment Completely Normalizes Adult Height and Improves Body Composition in Prader-Willi Syndrome: Experience from KIGS (Pfizer International Growth Database)

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          Background: Abnormal body composition, with low muscle mass and increased fat mass, as well as short adult stature are common features in Prader-Willi syndrome (PWS), as in growth hormone (GH) deficiency. Methods: We followed a cohort of 22 genetically verified patients with PWS from the start of GH (Genotropin®) treatment at the median age of 6.9 years (4.9–11.3) to near-adult height at 18.1 years (16.4–21.2). The patients were treated with a median GH dose of 0.03 mg/kg/day (0.02–0.03) for a median duration of 10.2 years (6.9–11.5). Results: All patients reached near-adult height within midparental height median –0.5 SDS (–1.4 to 0.7) and 0.9 SDS (0.1–1.9) for girls and boys, respectively. The body composition improved but did not normalize. Only 7 of the 22 patients were reported to be in puberty. None of the patients were reported to be on sex hormone substitution which might contribute to not reaching a normal body composition. No serious side effects were reported when the caloric intake was controlled to maintain an appropriate body weight. Conclusion: GH treatment in children with Prader-Wili syndrome normalizes adult height and improves body composition.

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          Most cited references 13

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          Serum insulin-like growth factor-I in 1030 healthy children, adolescents, and adults: relation to age, sex, stage of puberty, testicular size, and body mass index

           A Juul (1994)
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            Sustained benefit after 2 years of growth hormone on body composition, fat utilization, physical strength and agility, and growth in Prader-Willi syndrome.

            Obesity and hypotonia in children with Prader-Willi syndrome (PWS) are accompanied by abnormal body composition resembling a growth hormone (GH)-deficient state. Hypothalamic dysfunction in PWS includes decreased GH secretion, suggesting a possible therapeutic role for GH treatment. Although recent studies have demonstrated short-term benefits of treatment with GH, a critical question is whether beneficial changes persist or wane with prolonged therapy. Effects of 24 months of GH treatment (1 mg/m(2)/d) on growth, body composition, strength and agility, pulmonary function, resting energy expenditure, and fat utilization were assessed in 35 children with PWS. Percent body fat, lean muscle mass, and bone mineral density were measured by dual-energy x-ray absorptiometry. Indirect calorimetry was used to determine resting energy expenditure and to calculate the respiratory quotient. Compared with baseline evaluations, increased height velocity (SD score -1.1 +/- 2.5 to 2.2 +/- 2.3; P <. 001), reduced percent body fat (46.4% +/- 8.4% to 40.3% +/- 10.0%, P <.001), and improved respiratory muscle function and physical strength and agility (sit-ups, weight-lifts, running speed, and broad jump; P <.01) were observed after 24 months of GH treatment. A decline in respiratory quotient (0.81 +/- 0.07 to 0.75 +/- 0.06; P <. 01) and a trend toward increased resting energy expenditure were also observed. Changes in response to GH occurred predominantly during the initial 12 months of GH therapy. Children with PWS had sustained increases in lean body mass, decreases in percent body fat, improvements in physical strength and agility, and increased fat oxidation after 24 months of GH therapy. However, between 12 and 24 months, the growth rate slowed. Consequently, encouraging initial results require even more prolonged study to draw conclusions regarding the long-term value of GH therapy in changing body composition in children with PWS.
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              Low insulin, IGF-I and IGFBP-3 levels in children with Prader-Labhart-Willi syndrome.

              It is well established that insulin-like growth factor I (IGF-I), insulin-like growth factor binding protein-3 (IGFBP-3) and insulin are low in growth hormone deficiency, but due to their dependence on nutrition, they are elevated in healthy obese children. As the presence of growth hormone deficiency in Prader-Labhart-Willi syndrome (PWS) is still controversial, we studied insulin, IGF-I and IGFBP-3 levels in 19 children with PWS (age range 0.5-14.6 years). Serum concentrations of insulin (SDS: -0.7+/-0.9, P = 0.01) and IGF-I (SDS: -0.7+/-0.8, P = 0.002) were low, but IGFBP-3 (SDS: -0.3+/-1.2, P = 0.2) was normal compared to normal weight age-matched children. Since children with PWS are typically obese, insulin, IGF-I and IGFBP-3 levels should be compared to normal obese children who present increased levels of these hormones. In comparison to data of healthy obese children reported in the literature, not only IGF-I, but also IGFBP-3 levels are low and fasting insulin levels even very low, suggesting a growth hormone deficiency.

                Author and article information

                Horm Res Paediatr
                Hormone Research in Paediatrics
                S. Karger AG
                September 2008
                29 July 2008
                : 70
                : 3
                : 182-187
                aPaediatric Endocrinology Unit, Department of Woman and Child Health, Karolinska University Hospital and Stockholm Centre of Eating Disorders, and bPfizer Medical Outcomes, Stockholm, Sweden
                145019 Horm Res 2008;70:182–187
                © 2008 S. Karger AG, Basel

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                Page count
                Figures: 3, Tables: 1, References: 26, Pages: 6
                Original Paper


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