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Sustained effects of recombinant GH replacement after 7 years of treatment in adults with GH deficiency

Department of Endocrinology and Metabolic Diseases C4-R, Leiden University Medical Center, Po Box 9600, 2300 RC, Leiden, The Netherlands and ¹ University Medical Centre Utrecht, Utrecht, The Netherlands

(Correspondence should be addressed to A A van der Klaauw; Email: a.a.van_der_klaauw{at}lumc.nl)

Context: The goal of GH replacement with recombinant human GH (rhGH) is to ameliorate symptoms, signs, and complications of adult GH deficiency (GHD) in the long term. To determine whether the observed short-term beneficial effects of rhGH treatment are sustained in the long term, we evaluated biochemical and anthropometric parameters after 7 years of rhGH replacement.

Patients and methods: After 2, 5, and 7 years of rhGH replacement, 63 adult GHD patients (30 men, 52 adult-onset GHD) were assessed. IGF-I increased during rhGH replacement, and a stable dose of rhGH was reached within 1 year of rhGH substitution. Thereafter, this individualized dose was continued.

Results: Plasma levels of total cholesterol and low-density lipoprotein cholesterol decreased even after 5 years of rhGH replacement (11% decrease, P < 0.001; 22% decrease, P < 0.001 respectively). High-density lipoprotein cholesterol levels increased during 7 years of rhGH replacement (1.4 ± 0.5 mmol/l at baseline vs 1.7 ± 0.5 mmol/l after 7 years, P < 0.001), whereas triglyceride concentrations remained unchanged. Fasting glucose levels increased during follow-up, mainly during the first 2 years of rhGH replacement (4.4 ± 0.7 mmol/l to 5.0 ± 1.0 mmol/l, P < 0.001). Body mass index increased during follow-up, whereas waist circumference and waist-to-hip ratio remained unchanged. Diastolic blood pressure decreased (P = 0.002), but when patients using antihypertensive medication were excluded this decrease did not reach significance (P = 0.064). Systolic blood pressure remained unchanged.

Conclusion: The beneficial effects of rhGH replacement, described after short-term rhGH replacement, are sustained in the long term up to 7 years.

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