Abbreviations IBIS I, International Breast Intervention Study; RR, relative risk; AR per 1, 000, absolute risk difference per 1, 000 women for specified median follow up period using published cumulative or annual incidence rates; NNT, number needed to treat to prevent one additional outcome over specified median follow up period; NNH, number needed to harm the number needed to treat to observe adverse event or side effect for specified median follow up period; BC, breast cancer; NR, not reported in published literature; ER, estrogen receptor; DCIS, ductal carcinoma in situ; VTE, venous thromboembolic events; DVT, deep vein thrombosis; PE, pulmonary embolism; CVA, cardiovascular accident; TIA, transient ischemic attack <a href=
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