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The authors investigated invasive breast cancer incidence and mortality after a total follow-up of 11 years among the 16,608 postmenopausal women aged 50-79 years with no prior hysterectomy who were randomized to combined oral conjugated equine estrogens (0.625 mg/day) plus medroxyprogesterone acetate (2.5 mg/day) or placebo in the Women's Health Initiative (WHI) HRT study. In the initial reports from the WHI HRT study, breast cancer incidence was increased (hazard rate [HR], 1.26; 95% confidence interval [CI], 1.00-1.59).

Incidence and Mortality Data from the Women's Health Initiative