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More than 232,000 U.S. women are projected to receive diagnoses of invasive breast cancer in 2014. Although breast cancer incidence is incrementally lower in black women than in white women, black women are more likely to die from this highly treatable malignancy. To assess temporal and geographic trends in this disparity, investigators calculated black-to-white mortality rate ratios (RRs) in the 50 largest U.S. cities during 5-year intervals from 1990 through 2009 (T1=1990–1994; T4=2005–2009). RR>1.0 indicates higher mortality for black women; RR<1.0 corresponds to higher mortality for white women.
The overall U.S. RR was 1.17 during T1 and grew to 1.40 by T4. During T4, no city-specific RRs were <1.0; however, 23 individual RRs were >1.0. …