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Reproductive risk factors for breast cancer and association with novel breast density measurements among Hispanic, Black, and White women

  • Epidemiology
  • Published:
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Abstract

Purpose

There are differences in the distributions of breast cancer incidence and risk factors by race and ethnicity. Given the strong association between breast density and breast cancer, it is of interest describe racial and ethnic variation in the determinants of breast density.

Methods

We characterized racial and ethnic variation in reproductive history and several measures of breast density for Hispanic (n = 286), non-Hispanic Black (n = 255), and non-Hispanic White (n = 1694) women imaged at a single hospital. We quantified associations between reproductive factors and percent volumetric density (PVD), dense volume (DV), non-dense volume (NDV), and a novel measure of pixel intensity variation (V) using multivariable-adjusted linear regression, and tested for statistical heterogeneity by race and ethnicity.

Results

Reproductive factors most strongly associated with breast density were age at menarche, parity, and oral contraceptive use. Variation by race and ethnicity was most evident for the associations between reproductive factors and NDV (minimum p-heterogeneity:0.008) and V (minimum p-heterogeneity:0.004) and least evident for PVD (minimum p-heterogeneity:0.042) and DV (minimum p-heterogeneity:0.041).

Conclusion

Reproductive choices, particularly those related to childbearing and oral contraceptive use, may contribute to racial and ethnic variation in breast density.

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Data availability

Study data may be shared upon reasonable request and with approval of the appropriate Institutional Review Boards.

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Funding

Researchers were supported in part by the National Cancer Institute of the National Institutes of Health via K00 CA212222 (MEB), T32 CA09001 (MEB, NCD) and K01 CA188075 (ETW), the Karin Grunebaum Cancer Research Foundation (MEB), the Dahod Breast Cancer Research Program of the Boston University School of Medicine (MEB), and the National Institute of Environmental Health Sciences of the National Institutes of Health via the University of Louisville Center for Integrative Environmental Health Sciences (CIEHS) P30 ES030283 (NCD). The contents of this manuscript are solely the responsibility of the authors. The funders played no role in study design, data collection, analysis and interpretation of data, or the writing of this manuscript.

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All nine co-authors meet the authorship guidelines suggested by the International Committee of Medical Journal Editors. Seven co-authors contributed to the conception and design of the work (MEB, NCD, JJH, DJM, AC, ETW, RMT); six co-authors collected the data (MEB, NCD, JJH, EEF, DJM, AC); one co-author conducted the analyses and wrote the first draft of this manuscript (MEB); eight co-authors provided feedback on analyses and intellectually contributed to revision of the manuscript (NCD, JJH, EEF, DJM, AC, RLN, ETW, RMT), and two co-authors provided supervision at all stages of the project (ETW and RMT). All authors read and approved the final manuscript.

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Correspondence to Mollie E. Barnard.

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Competing Interests

Mollie E. Barnard reports personal fees from Epi Excellence LLC outside of the submitted work. Ariane Chan was an employee of Volpara Health Technologies Ltd. while contributing to this manuscript and holds shares in the company.

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All study procedures were approved by the Institutional Review Board at Brigham and Women’s Hospital of Mass General Brigham.

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All participants provided written informed consent to participate in the study.

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Barnard, M.E., DuPré, N.C., Heine, J.J. et al. Reproductive risk factors for breast cancer and association with novel breast density measurements among Hispanic, Black, and White women. Breast Cancer Res Treat 204, 309–325 (2024). https://doi.org/10.1007/s10549-023-07174-w

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