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Background
The trial assigning individualized options for treatment (Rx) (TAILORx) confirmed the predictive value of the 21‐gene recurrence score (RS) assay in hormone receptor (HR)–positive, HER2‐negative, node‐negative breast cancer and established thresholds for chemotherapy benefit in younger and older patients. Real‐world chemotherapy use and RS‐guided treatment costs in British Columbia post‐TAILORx...