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Cancer Epidemiology, Biomarkers & Prevention
Cancer Epidemiology, Biomarkers & Prevention
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Body Size, Mammographic Density, and Breast Cancer Risk

Norman F. Boyd, Lisa J. Martin, Limei Sun, Helen Guo, Anna Chiarelli, Greg Hislop, Martin Yaffe and Salomon Minkin
Norman F. Boyd
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Lisa J. Martin
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Limei Sun
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Helen Guo
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Anna Chiarelli
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Greg Hislop
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Martin Yaffe
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Salomon Minkin
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DOI: 10.1158/1055-9965.EPI-06-0345 Published November 2006
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Abstract

Background: Greater weight and body mass index (BMI) are negatively correlated with mammographic density, a strong risk factor for breast cancer, and are associated with an increased risk of breast cancer in postmenopausal women, but with a reduced risk in premenopausal women. We have examined the associations of body size and mammographic density on breast cancer risk.

Method: We examined the associations of body size and the percentage of mammographic density at baseline with subsequent risk of breast cancer among 1,114 matched case-control pairs identified from three screening programs. The effect of each factor on risk of breast cancer was examined before and after adjustment for the other, using logistic regression.

Results: In all subjects, before adjustment for mammographic density, breast cancer risk in the highest quintile of BMI, compared with the lowest, was 1.04 [95% confidence interval (CI), 0.8-1.4]. BMI was associated positively with breast cancer risk in postmenopausal women, and negatively in premenopausal women. After adjustment for density, the risk associated with BMI in all subjects increased to 1.60 (95% CI, 1.2-2.2), and was positive in both menopausal groups. Adjustment for BMI increased breast cancer risk in women with 75% or greater density, compared with 0%, increased from 4.25 (95% CI, 1.6-11.1) to 5.86 (95% CI, 2.2-15.6).

Conclusion: BMI and mammographic density are independent risk factors for breast cancer, and likely to operate through different pathways. The strong negative correlated between them will lead to underestimation of the effects on risk of either pathway if confounding is not controlled. (Cancer Epidemiol Biomarkers Prev 2006;15(11):2086–92)

  • Breast cancer
  • Mammographic density
  • Body size

Footnotes

  • Grant support: National Cancer Institute of Canada and the Canadian Breast Cancer Research Alliance. Dr. Boyd is supported by the Lau Chair in Breast Cancer Research.

  • The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked advertisement in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

    • Accepted September 13, 2006.
    • Received April 27, 2006.
    • Revision received August 29, 2006.
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Cancer Epidemiology Biomarkers & Prevention: 15 (11)
November 2006
Volume 15, Issue 11
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Body Size, Mammographic Density, and Breast Cancer Risk
Norman F. Boyd, Lisa J. Martin, Limei Sun, Helen Guo, Anna Chiarelli, Greg Hislop, Martin Yaffe and Salomon Minkin
Cancer Epidemiol Biomarkers Prev November 1 2006 (15) (11) 2086-2092; DOI: 10.1158/1055-9965.EPI-06-0345

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Body Size, Mammographic Density, and Breast Cancer Risk
Norman F. Boyd, Lisa J. Martin, Limei Sun, Helen Guo, Anna Chiarelli, Greg Hislop, Martin Yaffe and Salomon Minkin
Cancer Epidemiol Biomarkers Prev November 1 2006 (15) (11) 2086-2092; DOI: 10.1158/1055-9965.EPI-06-0345
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