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Cancer Causes & Control

, Volume 26, Issue 4, pp 621–626 | Cite as

Mammographic density and breast cancer risk by family history in women of white and Asian ancestry

  • Gertraud MaskarinecEmail author
  • Kaylae L. Nakamura
  • Christy G. Woolcott
  • Shannon M. Conroy
  • Celia Byrne
  • Chisato Nagata
  • Giske Ursin
  • Celine M. Vachon
Original paper

Abstract

Purpose

Mammographic density, i.e., the radiographic appearance of the breast, is a strong predictor of breast cancer risk. To determine whether the association of breast density with breast cancer is modified by a first-degree family history of breast cancer (FHBC) in women of white and Asian ancestry, we analyzed data from four case–control studies conducted in the USA and Japan.

Methods

The study population included 1,699 breast cancer cases and 2,422 controls, of whom 45 % reported white (N = 1,849) and 40 % Asian (N = 1,633) ancestry. To standardize mammographic density assessment, a single observer re-read all mammograms using one type of interactive thresholding software. Logistic regression was applied to estimate odds ratios (OR) while adjusting for confounders.

Results

Overall, 496 (12 %) of participants reported a FHBC, which was significantly associated with breast cancer risk in the adjusted model (OR 1.51; 95 % CI 1.23–1.84). There was a statistically significant interaction on a multiplicative scale between FHBC and continuous percent density (per 10 % density: p = 0.03). The OR per 10 % increase in percent density was higher among women with a FHBC (OR 1.30; 95 % CI 1.13–1.49) than among those without a FHBC (OR 1.14; 1.09–1.20). This pattern was apparent in whites and Asians. The respective ORs were 1.45 (95 % CI 1.17–1.80) versus 1.22 (95 % CI 1.14–1.32) in whites, whereas the values in Asians were only 1.24 (95 % CI 0.97–1.58) versus 1.09 (95 % CI 1.00–1.19).

Conclusions

These findings support the hypothesis that women with a FHBC appear to have a higher risk of breast cancer associated with percent mammographic density than women without a FHBC.

Keywords

Breast neoplasms Mammographic density Family history Epidemiology Risk factor Effect modification 

Abbreviations

BMI

Body mass index

CI

Confidence interval

FHBC

Family history of breast cancer

HT

Hormone therapy

OR

Odds ratio

Notes

Acknowledgments

This research was supported by the National Cancer Institute, US Department of Health and Human Services, Grant no. R03 CA 135699. CGW and SMC were supported during the work on this Project by postdoctoral fellowships on grant R25 CA 90956.

Conflict of interest

The authors declare no conflict of interest.

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Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  • Gertraud Maskarinec
    • 1
    Email author
  • Kaylae L. Nakamura
    • 1
  • Christy G. Woolcott
    • 2
  • Shannon M. Conroy
    • 3
  • Celia Byrne
    • 4
  • Chisato Nagata
    • 5
  • Giske Ursin
    • 6
  • Celine M. Vachon
    • 7
  1. 1.University of Hawaii Cancer CenterHonoluluUSA
  2. 2.Departments of Obstetrics and Gynaecology and PediatricsDalhousie UniversityHalifaxCanada
  3. 3.Department of Public Health SciencesUniversity of California Davis School of MedicineDavisUSA
  4. 4.Uniformed Services University of the Health SciencesBethesdaUSA
  5. 5.Gifu University Graduate School of MedicineGifu-shiJapan
  6. 6.Cancer Registry of NorwayOsloNorway
  7. 7.Mayo ClinicRochesterUSA

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