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Cumulative incidence of deaths. A) Deaths attributed to breast cancer. B) Deaths attributed to other causes. Data are shown by trial (National Surgical Adjuvant Breast and Bowel Project [NSABP] B-17 and NSABP B-24) and treatment group—lumpectomy only (LO), lumpectomy followed by radiation therapy (LRT), and lumpectomy with radiation therapy plus 5 years of placebo (LRT + placebo) or tamoxifen (LRT + TAM). CI = confidence interval.
