Increasing disparities in breast cancer mortality from 1979 to 2010 for US black women aged 20 to 49 years.

Racial disparities in breast cancer mortality persist, and young Black women have higher disease incidence compared with White women. We compared trends in breast cancer mortality for young Black and White women with mortality trends for other common diseases from 1979 to 2010. In contrast to other cancers, ischemic heart disease, and stroke, the breast cancer mortality disparity has widened over the past 30 years, suggesting that unique aspects of disease biology, prevention, and treatment may explain persistent racial differences for young women.