Abstract

Researchers used Surveillance, Epidemiology, and End Results (SEER) and Medicare data to examine outcomes among 3409 older women (age, ≥66) who were treated with radiation therapy after conservative surgery for ductal carcinoma in situ (DCIS). Evaluated outcomes included subsequent ipsilateral in situ or invasive breast cancer and subsequent mastectomy. The combined risk for any study outcome at 5 years was 10.7% among women who did not receive radiation and 3.6% among women who …

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