Guan A, Lichtensztajn D, Oh D, et al. - Using a novel geographic approach, researchers sought to summarize the distribution of breast cancer in San Francisco and investigate the neighborhoods and racial/ethnic groups that are disproportionately afflicted with 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 examined the distribution of breast cancer cases in these zones. From January 1, 2006, to December 31, 2015, the diagnosis of a total of 5,595 invasive primary breast cancers was made. 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. The greatest disparities in breast cancer–related outcomes were reported among Blacks/African Americans across geographic areas. Worse breast cancer outcomes were reported in San Francisco neighborhoods with lower socioeconomic status and larger minority populations.