JOURNAL ARTICLE
MULTICENTER STUDY
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Is GH dosing optimal in female patients with adult-onset GH deficiency? An analysis from the NordiNet ® International Outcome Study.

OBJECTIVE: To evaluate gender differences in GH dosing, IGF-I and cardiovascular risk markers in adults with GH deficiency (GHD).

DESIGN: NordiNet® International Outcome Study (NCT00960128), a noninterventional, multicentre study, evaluates the long-term effectiveness and safety of Norditropin® (Novo Nordisk A/S) in the real-life clinical setting.

PATIENTS: Nondiabetic patients (n = 252; 41·7% female) with adult-onset GHD (age ≥20 years at GH start), ≥4 years' GH therapy and glycosylated haemoglobin (HbA1c ) data at baseline and 4 years.

MEASUREMENTS: Effects of gender (adjusted for baseline age and body mass index [BMI], average GH dose, treatment duration and concomitant medication) on change from baseline to 4 years (∆) in HbA1c , fasting plasma glucose (FPG), IGF-I, lipids and waist circumference were evaluated.

RESULTS: GH dose (mean [SE]; mg/day) was similar between females (0·22 [0·02]) and males (0·21 [0·01]) at baseline, but higher in females from year 1 (year 4, females, 0·45 [0·03]; males, 0·32 [0·02]). Mean IGF-I standard deviation score [SDS] was lower in females vs males at each treatment year; more than one-third of females still had an IGF-I SDS below 0 at year 4, compared with only 21·8% of men. An adverse lipid profile at baseline remained poor in more females than males at 4 years. Improvement in total cholesterol was significantly associated with gender (P < 0·0001), improving less in females than in males.

CONCLUSIONS: These data highlight that, even after 4 years, GH dose is suboptimal in many female patients, which may impact clinical outcomes; therefore, GH titration for women requires further improvement.

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