Comparison of Transdermal and Oral Estrogen Therapy in Girls with Turner's Syndrome

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Abstract
Eight girls with Turner's syndrome were given low dose oral ethinyl estradiol or transdermal 17 beta-estradiol in order to compare the effect of the route of administration on selected markers of hepatic metabolism, and various hormonal concentrations. Oral estrogen was given at a dose of 100 ng/kg/day and transdermal estrogen via adhesive skin patch at 0.0125 mg/kg/day. The subjects received one form of estradiol for one month, and after a one month washout period, received the other form. Both oral and transdermal estradiol caused a significant decrease in FSH while only transdermal resulted in a significant decrease in LH. Oral estradiol, though not transdermal estradiol, increased serum high density lipoprotein, thyroxine binding protein and growth hormone binding protein. Urinary growth hormone excretion increased after both forms of therapy, while insulin-like growth factor-I and insulin-like growth factor binding protein-3 remained unchanged. Thus, in girls with Turner's syndrome, estrogen replacement by the transdermal route may have less deleterious effect on hepatic metabolism than oral estrogen.

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