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BACKGROUNDThe purpose of the current study was to evaluate the impact of radiotherapy (RT) among women aged ≥ 70 years with T1‐2N0 estrogen receptor (ER)‐negative breast cancer using Surveillance, Epidemiology, and End Results (SEER)‐Medicare‐linked data.
METHODSThe study included 3432 women, 2850 of whom received and 582 of whom did not receive RT after breast‐conserving surgery. Outcomes were estimated...
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