Adjuvant Chemotherapy and Survival in Older Women With Hormone Receptor–Negative Breast Cancer: Assessing Outcome in a Population-Based, Observational Cohort

This analysis suggests a survival benefit from adjuvant chemotherapy in older women with HR-negative breast cancer. The benefit of chemotherapy is most pronounced in the patients most likely to be selected for treatment, including those with involved lymph nodes or other high-risk disease characteristics.