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Breast cancer risk in older women: results from the NIH-AARP Diet and Health Study

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Abstract

Background

Divergent risk factors exist for premenopausal and postmenopausal breast cancers, but it is unclear whether differences by age exist among postmenopausal women.

Methods

We examined relationships among 190,872 postmenopausal women, ages 50–71 years recruited during 1995–1996 for the NIH-AARP Diet and Health Study, in whom 7,384 incident invasive breast carcinomas were identified through 2006. Multivariable Cox regression hazard ratios (HRs) and 95 % confidence intervals (CIs) were estimated for breast cancer risk factors by age (50–59, 60–69, ≥70 years).

Results

The only factor showing significant statistical heterogeneity by age (p het = 0.001) was menopausal hormone therapy duration, but trends were apparent across all ages and the strongest association prevailed among women 60–69 years. Although other risk factors did not show statistically significant heterogeneity by age, we did observe attenuated relations for parity and late age at first birth among older women [e.g., HR for age at first birth ≥30 vs. 20–24 = 1.62 (95 % CI 1.23–2.14) for women 50–59 years vs. 1.12 (0.96–1.31) for ≥70 years]. In contrast, risk estimates associated with alcohol consumption and BMI tended to be slightly stronger among the oldest subjects [e.g., HR for BMI ≥35 vs. 18.5–24.9 = 1.24 (95 % CI 0.97–1.58) for 50–59 years vs. 1.46 (1.26–1.70) for ≥70 years]. These differences were somewhat more pronounced for estrogen receptor positive and ductal cancers, tumors predominating among older women. Breast cancer family history, physical activity, and previous breast biopsies did not show divergent associations by age.

Conclusion

Although breast cancer risk factor differences among older women were not large, they may merit further consideration with respect to individualized risk prediction.

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Acknowledgments

This research was supported in part by the Intramural Research Program of the National Cancer Institute at the National Institutes of Health. Dr. Cher Dallal was supported by the Cancer Prevention Fellowship Program, National Institutes of Health, Bethesda, MD. Cancer incidence data from the collected by the Georgia Center for Cancer Statistics, Department of Epidemiology, Rollins School of Public Health, Emory University (for the Atlanta metropolitan area); the California Department of Health Services, Cancer Surveillance Section; the Michigan Cancer Surveillance Program, Community Health Administration, State of Michigan (for the Detroit metropolitan area); the Florida Cancer Data System (FCDC) under contract with the Florida Department of Health (FDOH); the Louisiana Tumor Registry, Louisiana State University Medical Center in New Orleans; the New Jersey State Cancer Registry, Cancer Epidemiology Services, New Jersey State Department of Health and Senior Services; the North Carolina Central Cancer Registry; the Division of Health Statistics and Research, Pennsylvania Department of Health, Harrisburg, Pennsylvania; the Arizona Cancer Registry, Division of Public Health Services, Arizona Department of Health Services; and the Texas Cancer Registry, Cancer Epidemiology and Surveillance Branch, Texas Department of State Health Services. The Pennsylvania Department of Health specifically disclaims responsibility for any analyses, interpretations, or conclusions. The views expressed herein are solely those of the authors and do not necessarily reflect those of the FCDC or FDOH. We are indebted to the participants in the NIH-AARP Diet and Health Study for their outstanding cooperation. We also thank Sigurd Hermansen and Kerry Grace Morrissey from Westat for study outcomes ascertainment and management and Leslie Carroll at Information Management Services for data support and analysis.

Conflict of interest

The authors declare that they have no conflict of interest.

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Correspondence to Louise A. Brinton.

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Brinton, L.A., Smith, L., Gierach, G.L. et al. Breast cancer risk in older women: results from the NIH-AARP Diet and Health Study. Cancer Causes Control 25, 843–857 (2014). https://doi.org/10.1007/s10552-014-0385-3

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  • DOI: https://doi.org/10.1007/s10552-014-0385-3

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