The binding of steroids to myometrium and leiomyomata (fibroids) in women treated with the gonadotrophin-releasing hormone agonist Zoladex (ICI 118630)

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Abstract
Since uterine leiomyomata (fibroids) are not found in conditions where oestradiol is either absent or present only in low concentrations, oestradiol is considered to be an important factor in the control of fibroid growth. To investigate whether this is due to a direct effect on the tissue, oestradiol and progestogen receptors were measured in tissue removed at hysterectomy from 12 normally cycling women and 13 women who had received the gonadotrophin-releasing hormone (GnRH) agonist Zoladex (ICI 118630) as a subcutaneous depot given at monthly intervals for 3 months preoperatively and a third group of three women who had received the antioestrogen tamoxifen (20 mg daily) for 3 months before surgery. Both unoccupied oestradiol receptors (measured by separating bound from free hormone with dextran-coated charcoal; DCC) and 'total' receptor populations (as measured by an enzyme immunoassay) were measured in each fibroid and adjoining myometrium. There was significantly more binding of both oestradiol and progestogen to fibroid than to myometrium in both the control (P P P P Journal of Endocrinology (1989) 121, 389–396