Black women under the age of 45 are at increased risk for an aggressive form of breast cancer [estrogen receptor (ER) negative] if they experienced a high number of pregnancies, never breast fed, and/or had higher waist-to-hip ratio

Mortality from breast cancer is markedly higher in African American women as compared to white women in the United States, in part because they are more likely to be diagnosed with ER-negative tumors, which are more aggressive and difficult to treat. African American women are also diagnosed with breast cancer at younger ages.