Abstract
To evaluate the variation of serum IGF-1 levels during GH replacement and observe gender differences, 29 adults with GH deficiency (mean age 42.5 ± 10.1 year), were studied. Serum IGF-1 was assessed every 4 weeks during the titration period and afterwards every 3 months of GH therapy. At baseline 77.7% of women and 45.4% of men had serum baseline IGF-1 levels below the lower limit of normal age-related reference range. The time to reach the maintenance dose was lower in men than women ( p < 0.05). There was an increase in IGF-1 levels after one year of GH therapy, significant only in men ( p < 0.01). IGF-1 concentrations were higher in men than women ( p < 0.05), at the 12th and 18th months of GH therapy. GH dose was reduced by 25% in men ( p < 0.01). At the end of the study the mean GH dose was lower in men than in women ( p < 0.05). The factor responsible for these findings is not known, however a possible role of androgens has been suggested.
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