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  • Title: Impact of the underlying etiology of growth hormone deficiency on serum IGF-I SDS levels during GH treatment in children.
    Author: Léger J, Mohamed D, Dos Santos S, Ben Azoun M, Zénaty D, Simon D, Paulsen A, Martinerie L, Chevenne D, Alberti C, Carel JC, Guilmin-Crepon S.
    Journal: Eur J Endocrinol; 2017 Sep; 177(3):267-276. PubMed ID: 28760908.
    Abstract:
    CONTEXT: Regular monitoring of serum IGF-I levels during growth hormone (GH) therapy has been recommended, for assessing treatment compliance and safety. OBJECTIVE: To investigate serum IGF-I SDS levels during GH treatment in children with GH deficiency, and to identify potential determinants of these levels. DESIGN, PATIENTS AND METHODS: This observational cohort study included all patients (n = 308) with childhood-onset non-acquired or acquired GH deficiency (GHD) included in the database of a single academic pediatric care center over a period of 10 years for whom at least one serum IGF-I SDS determination during GH treatment was available. These determinations had to have been carried out centrally, with the same immunoradiometric assay. Serum IGF-I SDS levels were determined as a function of sex, age and pubertal stage, according to our published normative data. RESULTS: Over a median of 4.0 (2-5.8) years of GH treatment per patient, 995 serum IGF-I SDS determinations were recorded. In addition to BMI SDS, height SDS and GH dose (P < 0.01), etiological group (P < 0.01) had a significant effect on serum IGF-I SDS levels, with patients suffering from acquired GHD having higher serum IGF-I SDS levels than those with non-acquired GHD, whereas sex, age, pubertal stage, treatment duration, hormonal status (isolated GHD (IGHD) vs multiple pituitary hormone deficiency (MPHD)) and initial severity of GHD, had no effect. CONCLUSIONS: These original findings have important clinical implications for long-term management and highlight the need for careful and appropriate monitoring of serum IGF-I SDS and GH dose, particularly in patients with acquired GHD, to prevent the unnecessary impact of potential comorbid conditions.
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