Mammography screening and breast cancer biology in African American women--a review.

This review examines some of the key issues in early detection and breast cancer biology for African American (AA) women which contribute to their diagnoses at more advanced stages than white women, and poorer long-term prognoses. While screening mammography is considered an essential factor in eliminating these disparities, its optimal application for AAs is not fully understood. There is a paucity of information on the success with which mammography screening programs are maintained over time in the AA population, and on screening guidelines with regard to age of initiation and frequency. No randomized clinical trials targeting AA women have been reported. This type of information is critical since breast cancer in AA women occurs at younger ages, and frequently demonstrates aggressive tumor biology at diagnosis. Studies are required to determine the incidence of interval cancers in current screening programs, and the influence of the biological characteristics which are known to differ in the breast tumors of AA and white women. Recognition of molecular and cellular characteristics which identify the potential invasiveness of ductal carcinomas in situ is also required. These studies would assist in establishing the criteria for identifying the subpopulation of younger pre-menopausal AA women who would benefit from early initiation of screening. Finally, the epidemiology and biology of mammographic densities, a risk factor for breast cancer and, perhaps, markers of aggressive disease require further study in both AA and white women.