Decreasing Incidence of Estrogen Receptor–Negative Breast Cancer in the United States: Trends by Race and Region

Incidence of estrogen receptor (ER)-negative breast cancer, an aggressive subtype, is highest in US African American women and in Southern residents but has decreased overall since 1992. We assessed whether ER-negative breast cancer is decreasing in all age groups and cancer registries among non-Hispanic White (NHW), non-Hispanic Black (NHB), and Hispanic White (HW) women.We analyzed 17 Surveillance, Epidemiology, and End-Results (SEER) Program...