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Breast cancer mortality in African-American and non-Hispanic white women by molecular subtype and stage at diagnosis: a population-based study
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Details:
  • Pubmed ID:
    25969506
  • Pubmed Central ID:
    PMC4490947
  • Description:
    Background

    Higher breast cancer mortality rates for African-American than non-Hispanic white women are well documented; however, it remains uncertain if this disparity occurs in disease subgroups defined by tumor molecular markers and stage at diagnosis. We examined racial differences in outcome according to subtype and stage in a diverse, population-based series of 103,498 patients.

    Methods

    We obtained data for all invasive breast cancers diagnosed 1/1/2005-12/31/2012 and followed through 12/31/2012 among 93,760 non-Hispanic white and 9,738 African-American women in California. Molecular subtypes were categorized according to tumor expression of hormone receptor (HR, based on estrogen and progesterone receptors) and human epidermal growth factor receptor 2 (HER2). Cox proportional hazards models were used to calculate hazard ratios (HR) and 95% confidence intervals (CI) for breast cancer-specific mortality.

    Results

    After adjustment for patient, tumor and treatment characteristics, outcomes were comparable by race for Stage I or IV cancer regardless of subtype, and HR+/HER2+ or HR-/HER2+ cancer regardless of stage. We found substantially higher hazards of breast cancer death among African-American women with Stage II/III HR+/HER2- (HR, 1.31, 95% CI, 1.03-1.65, and HR, 1.39, 95% CI, 1.10-1.75, respectively) and Stage III triple-negative cancers relative to whites.

    Conclusions

    There are substantial racial/ethnic disparities among patients with Stages II/III HR+/HER2- and Stage III triple-negative breast cancers but not for other subtype and stage.

    Impact

    These data provide insights to assess barriers to targeted treatment (e.g. trastuzumab or endocrine therapy) of particular subtypes of breast cancer among African-American patients.

  • Document Type:
  • Collection(s):
  • Funding:
    HHSN261201000140C/CA/NCI NIH HHS/United States
    HHSN261201000035C/CA/NCI NIH HHS/United States
    HHSN261201000036C/CA/NCI NIH HHS/United States
    HHSN261201000010C/CA/NCI NIH HHS/United States
    U58 DP000807/DP/NCCDPHP CDC HHS/United States
    HHSN261201000035I/CA/NCI NIH HHS/United States
    HHSN261201000034C/CA/NCI NIH HHS/United States
    HHSN261201000040C/CA/NCI NIH HHS/United States
    HHSN261201000040I/CA/NCI NIH HHS/United States
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