Incidence of endometrial hyperplasia in postmenopausal women taking conjugated estrogens (Premarin) with medroxyprogesterone acetate or conjugated estrogens alone. The Menopause Study Group

American Journal of Obstetrics and Gynecology
J D Woodruff, J H Pickar

Abstract

We evaluated four oral combinations of conjugated estrogens (Premarin) and medroxyprogesterone acetate in preventing endometrial hyperplasia, which can occur with conjugated estrogens alone. This was a 1-year prospective, double-blind, randomized, multicenter study in 1724 postmenopausal women. All five groups took conjugated estrogens (0.625 mg) daily. The respective medroxyprogesterone acetate dosages were 2.5 and 5.0 mg daily (groups A and B) and 5.0 and 10.0 mg for 14 days per 28-day cycle (groups C and D). Among the 1385 patients with valid biopsy data, endometrial hyperplasia developed in 20% in the conjugated estrogens-treated group and < or = 1% in each of the four conjugated estrogens/medroxyprogesterone acetate-treated groups. The incidence of endometrial hyperplasia did not differ significantly between any of the conjugated estrogens/medroxyprogesterone acetate regimens. However, none of the patients receiving the two higher medroxyprogesterone acetate dosages (groups B and D) had endometrial hyperplasia. The endometrial hyperplasia incidence was significantly lower in women treated with conjugated estrogens and medroxyprogesterone acetate than in women treated with conjugated estrogens alone.

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