Potential role for medroxyprogesterone acetate as an adjuct to goserelin (Zoladex) in the medical management of uterine fibroids

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Abstract
Twenty women with symptomatic uterine fibroids were treated with the luteinizing hormone-releasing hormone (LHRH) agonist goserelin (Zoladex) combined with medroxy-progesterone acetate (MPA) in an open pilot study comparing two protocols. Ten women received goserelin 3.6 mg monthly combined with oral MPA 15 mg daily for 6 months. The mean uterine volume (497 cm3) measured by ultrasound fell by only 18% after 3 months, with no further reduction at 6 months. The other 10 women received goserelin alone for the initial 3 months, followed by combined treatment for 3 months. The mean uterine volume (557 cm3) fell by 39% after 3 months with no significant regrowth by 6 months. At 6 months post-treatment, uterine volume had not returned to pretreatment size. MPA significantly reduced the frequency of vasomotor side-effects. There were no differences in plasma oestradiol, luteinizing hormone or follicle stimulating hormone concentrations between the protocols and good symptomatic relief was experienced by both groups. Two years after completion, three women in each group have requested surgical treatment. The results indicate that MPA may be a useful adjunct to LHRH analogues in women with fibroids, reducing side-effects and possibly prolonging the response, although positive effects on bone density have yet to be confirmed. The optimum regimen of administration remains to be clarified as the clinical results were the same with both protocols.

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