<i>Background:</i> Coronary artery disease is the leading cause of death in women. Several randomized clinical trials of hormone replacement therapy (HRT) in women with and without coronary artery disease have found no benefit of HRT in decreasing cardiovascular events. The purpose of this study was to assess the benefits and risks of HRT for prevention of cardiovascular events by conducting a meta-analysis of all randomized trials of HRT, and estimate cardiovascular event rates. <i>Methods and Results:</i> All relevant randomized, clinical trials were identified in MEDLINE (1966–2001), HealthSTAR (1975–2001), and Cochrane Library databases. The search terms were hormone replacement or HRT[, ]estrogen[, ]progesterone[, ]women and heart disease. We used all published data of randomized, clinical trials of HRT if they reported cardiovascular endpoints. Meta-analysis of the randomized, clinical trials involving 21,066 patients revealed that HRT did not reduce mortality compared with control group (1.9 vs. 1.9%, odds ratio 1.05, 95% CI 0.86–1.30, p = 0.58) or significantly reduce risk of myocardial infarction (3.7 vs. 3.7%, odds ratio 1.04, 95% CI 0.90–1.21, p =
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