Abstract
Purpose
Studies comparing the effect of aromatase inhibitor (AI) and tamoxifen use on cardiovascular disease (CVD) risk factors in hormone receptor-positive breast cancer (BC) survivors report conflicting results. We examined associations of endocrine therapy use with incident diabetes, dyslipidemia, and hypertension.
Methods
The Pathways Heart Study examines cancer treatment exposures with CVD-related outcomes in Kaiser Permanente Northern California members with BC. Electronic health records provided sociodemographic and health characteristics, BC treatment, and CVD risk factor data. Hazard ratios (HR) and 95% confidence intervals (CI) of incident diabetes, dyslipidemia, and hypertension in hormone receptor-positive BC survivors using AIs or tamoxifen compared with survivors not using endocrine therapy were estimated using Cox proportional hazards regression models adjusted for known confounders.
Results
In 8985 BC survivors, mean baseline age and follow-up time was 63.3 and 7.8 years, respectively; 83.6% were postmenopausal. By treatment, 77.0% used AIs, 19.6% used tamoxifen, and 16.0% used neither. Postmenopausal women who used tamoxifen had an increased rate (HR 1.43, 95% CI 1.06–1.92) of developing hypertension relative to those who did not use endocrine therapy. Tamoxifen use was not associated with incident diabetes, dyslipidemia, or hypertension in premenopausal BC survivors. Postmenopausal AI users had higher hazard rates of developing diabetes (HR 1.37, 95% CI 1.05–1.80), dyslipidemia (HR 1.58, 95% CI 1.29–1.92), and hypertension (HR 1.50, 95% CI 1.24–1.82) compared with non-endocrine therapy users.
Conclusion
Hormone receptor-positive BC survivors treated with AIs may have higher rates of developing diabetes, dyslipidemia, and hypertension over an average 7.8 years post-diagnosis.
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Data availability
These data are not publicly available because they contain potentially identifiable information but may be available from Kaiser Permanente Northern California contingent on appropriate human subjects’ approval and necessary data use agreements.
Abbreviations
- AJCC:
-
American Joint Committee on Cancer
- AI:
-
Aromatase inhibitor
- BC:
-
Breast cancer
- BMI:
-
Body mass index
- CVD:
-
Cardiovascular disease
- CI:
-
Confidence interval
- EHR:
-
Electronic health record
- GED:
-
General education degree
- HR:
-
Hazard rate ratio
- ICD:
-
International Classification of Disease
- KPNC:
-
Kaiser Permanente Northern California
- SD:
-
Standard deviation
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Acknowledgements
We thank all the women who provided data for these analyses. We thank the National Institutes of Health National Cancer Institute for providing funding (R01CA214057).
Funding
The Pathways Heart Study is supported by the National Cancer Institute, Bethesda, MD 20814 (R01 CA214057, U01 CA195565).
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ER-S, MLK, and HG conceived and designed this study. Data collection and assembly was completed by MLK, ZS, CAL, VSL, JMR, YH, HS, and HG. Data analysis was completed by ER-S, CAL, YH, and HS. The findings were interpreted by ER-S, MLK, CI, RC, RN, JSR, MN-H, DLH, LHK, and HG. The first draft of the manuscript was written by ER-S and all authors commented on previous versions. All authors read and approved the final, submitted manuscript.
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The Human Subjects Institutional Review Board of Kaiser Permanente Northern California has approved this study.
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This was a data-only study that used existing protected health information from the electronic health records of Kaiser Permanente Northern California and is therefore, regulated by the HIPAA Privacy Rule.
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Rillamas-Sun, E., Kwan, M.L., Iribarren, C. et al. Development of cardiometabolic risk factors following endocrine therapy in women with breast cancer. Breast Cancer Res Treat 201, 117–126 (2023). https://doi.org/10.1007/s10549-023-06997-x
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DOI: https://doi.org/10.1007/s10549-023-06997-x