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Background  Prader-Willi-Syndrome (PWS) is characterized by hypothalamic-pituitary dysfunction. Recent research suggests starting growth hormone-treatment (GHT) as soon as possible. The aim of this study is to analyze possible differences in auxological parameters, carbohydrate and lipid metabolism between two groups of children with PWS that started GHT either during or after their first year of life.    Study design  Retrospective longitudinal study of 62 children (31 males) with genetically confirmed PWS. Upon diagnosis all children were offered GHT, some started immediately, others commenced later. Cohort A ( n  = 21; 11 males) started GHT at 0.3–0.99 yrs. (mean 0.72 yrs) and Cohort B ( n  = 41; 20 males) commenced GHT at 1.02–2.54 yrs. (mean 1.42 yrs) of age. Fasting morning blood samples and auxological parameters were obtained before the start of therapy and semi-annually thereafter. Differences between the two cohorts were estimated with a linear mixed-effect model.    Results  Mean length/height-SDS PWS  differed significantly between the groups [1 yr: A: 0.37 (±0.83) vs B: 0.05 (±0.56); 5 yrs.: A: 0.81 (±0.67) vs B: 0.54 (±0.64);  p  = 0.012]. No significant differences were found in BMI, lean body mass or body fat.  Low-density cholesterol was significantly lower in A than in B [LDL: 1 yr: A: 79 (±20) mg/dl vs B: 90 (±19) mg/dl; 5 yrs.: A: 91(±18) mg/dl vs 104 (±26) mg/dl;  p  = 0.024].  We found significant differences in the glucose homeostasis between the groups [fasting insulin:  p  = 0.012; HOMA-IR:  p  = 0.006; HbA1c:  p  < 0.001; blood glucose:  p  = 0.022].    Conclusions  An early start of GHT during the first year of life seems to have a favorable effect on height-SDS and metabolic parameters.

Early start of growth hormone is associated with positive effects on auxology and metabolism in Prader-Willi-syndrome