Chemotherapy Use and Surgical Treatment by Receptor Subtype in Node-Negative T1a and T1b Female Breast Cancers, Iowa SEER Registry, 2010- to 2012

Small node-negative breast cancers continue to grow significantly as a percentage of invasive breast cancer diagnoses. In 2010 to 2012 in Iowa, systemic chemotherapy correlated with risk factors associated with recurrence: age, subtype, and tumor differentiation. Relatively high rates of mastectomy were seen.