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BACKGROUND:African American (AA) women experience higher breast cancer mortality than white (W) women. These differences persist even among estrogen receptor (ER)‐positive breast cancers. The 21‐gene recurrence score (RS) predicts recurrence in patients with ER‐positive/lymph node‐negative breast cancer according to RS score—low risk (RS, 0‐18), intermediate risk (RS, 19‐31), and high risk (RS, >31)...
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