Abstract
Introduction
Relatively little research has been conducted on familial breast cancer in African American women.
Methods
Data from the Black Women’s Health Study, a prospective cohort study of African American women, were used to assess breast cancer risk in relation to family history of cancer. Since 1995, participants have completed biennial postal questionnaires on health status, risk factors, and family history of cancer. Cox proportional hazards analyses were used to calculate incidence rate ratios (IRRs) and 95% confidence intervals (CI) for family history of breast and other types of cancer.
Results
Among 57,364 participants who were cancer-free at baseline, 1,306 incident breast cancer cases occurred during 12 years of follow-up. The IRR for a first-degree family history of breast cancer relative to no family history was 1.78 (95% CI 1.55–2.06). IRRs varied by the age at diagnosis, from 1.60 (≥age 55) to 2.76 (<age35). Results were consistent across subtypes of breast tumor defined by estrogen and progesterone receptor status. Breast cancer risk was also associated with family history of colon cancer (IRR 1.35, 95% CI 1.12–1.63) and possibly with family history of leukemia (IRR 1.42, 95% CI 0.82–2.46).
Conclusions
These findings indicate a strong familial relationship for breast cancer in African American women. The associations with family history of colon cancer and leukemia warrant further investigation.
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Acknowledgments
This work was supported by the National Cancer Institute (R01 CA58420).
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Palmer, J.R., Boggs, D.A., Adams-Campbell, L.L. et al. Family history of cancer and risk of breast cancer in the Black Women’s Health Study. Cancer Causes Control 20, 1733–1737 (2009). https://doi.org/10.1007/s10552-009-9425-9
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DOI: https://doi.org/10.1007/s10552-009-9425-9