Guan A, Lichtensztajn DY, Oh D, et al. - Employing a novel geographic approach, researchers sought to describe the distribution of breast cancer in San Francisco. In addition, they sought to recognize the neighborhoods and racial/ethnic groups that are disproportionately affected by this disease. Based on racial/ethnic composition and neighborhood socioeconomic status, nine geographic groupings were newly defined. From the Greater Bay Area Cancer Registry, they identified a total of 5,595 invasive primary breast cancers which were diagnosed between January 1, 2006, and December 31, 2015. Patients in the Southeast (Bayview/Hunter's Point) and Northeast (Downtown, Civic Center, Chinatown, Nob Hill, Western Addition) areas were more frequently diagnosed with stage IIB+ breast cancer, and those in the East (North Beach, Financial District, South of Market, Mission Bay, Potrero Hill) and Southeast were more frequently diagnosed with triple-negative breast cancers. They observed the greatest disparities in breast cancer related outcomes among Blacks/African Americans relative to other racial/ethnic groups across geographic areas. These findings suggest that lower socioeconomic status and larger minority populations in San Francisco neighborhoods experience worse breast cancer outcomes.