Abstract
Purpose
Women with preeclampsia are more likely to deliver preterm. Reports of inverse associations between preeclampsia and breast cancer risk, and positive associations between preterm birth and breast cancer risk are difficult to reconcile. We investigated the co-occurrence of preeclampsia/gestational hypertension with preterm birth and breast cancer risk using data from the Premenopausal Breast Cancer Collaborative Group.
Methods
Across 6 cohorts, 3096 premenopausal breast cancers were diagnosed among 184,866 parous women. We estimated multivariable hazard ratios (HR) and 95% confidence intervals (CI) for premenopausal breast cancer risk using Cox proportional hazards regression.
Results
Overall, preterm birth was not associated (HR 1.02, 95% CI 0.92, 1.14), and preeclampsia was inversely associated (HR 0.86, 95% CI 0.76, 0.99), with premenopausal breast cancer risk. In stratified analyses using data from 3 cohorts, preterm birth associations with breast cancer risk were modified by hypertensive conditions in first pregnancies (P-interaction = 0.09). Preterm birth was positively associated with premenopausal breast cancer in strata of women with preeclampsia or gestational hypertension (HR 1.52, 95% CI: 1.06, 2.18), but not among women with normotensive pregnancy (HR = 1.09, 95% CI: 0.93, 1.28). When stratified by preterm birth, the inverse association with preeclampsia was more apparent, but not statistically different (P-interaction = 0.2), among women who did not deliver preterm (HR = 0.82, 95% CI 0.68, 1.00) than those who did (HR = 1.07, 95% CI 0.73, 1.56).
Conclusion
Findings support an overall inverse association of preeclampsia history with premenopausal breast cancer risk. Estimates for preterm birth and breast cancer may vary according to other conditions of pregnancy.
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Data availability
The data that support the findings of this study are not publicly available due to privacy or ethical restrictions. Study data may be shared upon reasonable request to senior authors.
Abbreviations
- BP:
-
Blood pressure
- BWHS:
-
Black Women’s Health Study
- CI:
-
Confidence interval
- ER:
-
Estrogen receptor
- GEN:
-
Generations Study
- HR:
-
Hazard ratio
- MCCS:
-
Melbourne Collaborative Cohort Study
- NHS2:
-
Nurses’ Health Study II
- RR:
-
Relative risk
- SIS:
-
Sister Study
- SWLS:
-
Swedish Women’s Lifestyle and Health Study
- UK:
-
United Kingdom
- USA:
-
United States of America
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Acknowledgements
The authors would like to thank all study participants, staff, and participating cancer registries. The Nurses' Health Study II thank study participants, staff, and the following state cancer registries: AL, AZ, AR, CA, CO, CT, DE, FL, GA, ID, IL, IA, IA, KY, LA, ME, MD, MA, MI, NE, NH, NJ, NY, NC, ND, OH, OK, OR, PA, RI, SC, TN, TX, VA, WA, and WY. The Black Women's Health Study obtained pathology data on breast cancer from state cancer registries in AZ, CA, CO, CT, DE, DC, FL, GA, IL, IN, KY, LA, MD, MA, MI, NJ, NY, NC, OK, PA, SC, TN, TX, and VA. The Melbourne Collaborative Cohort Study cases and their vital status were ascertained through the Victorian Cancer Registry and the Australian Institute of Health and Welfare, including the Australian Cancer Database. The authors assume full responsibility for analyses and interpretation of these data. They thank the National Cancer Institute Cohort Consortium for facilitating this collaboration.
Funding
Support for this research comes, in part, by the National Institutes of Health (R01CA204258; R01CA058420; U01CA164974; P01CA151135; U01CA176726; UM1CA186107; R01CA50385) and the Intramural Research Program of the National Institutes of Health, National Institute of Environmental Health Sciences (Z01 ES044005); the Avon Foundation (02–2014-080); the National Center for Advancing Translational Sciences (KL2-TR001109); the National Program of Cancer Registries of the Centers for Disease Control and Prevention and the Department of Energy; Breast Cancer Now and the United Kingdom National Health Service funding to the Royal Marsden/Institute of Cancer Research National Institute for Health Research Biomedical Research Centre; the Institute of Cancer Research (02–2014-080); Karolinska Institutet Distinguished Professor Award (2368/10–221); VicHealth, Cancer Council Victoria and the Australia National Health and Medical Research Council (209057, 396414, and 1074383); Breast Cancer Research Foundation (17–138); the Swedish Research Council and Swedish Cancer Foundation; The coordination of EPIC (the European Prospective Investigation into Cancer and Nutrition) is financially supported by the European Commission (DG-SANCO) and the International Agency for Research on Cancer. The national cohorts are supported by the Swedish Cancer Society, Swedish Research Council, and county councils of Skåne and Va¨ sterbotten (Sweden); and grant 14136 to European Prospective Study into Cancer and Nutrition (EPIC)–Norfolk and grants C570/A16491 and C8221/A19170 to EPIC-Oxford from Cancer Research UK and grant 1000143 to EPIC-Norfolk and MR/M012190/1 to EPIC-Oxford from the Medical Research Council (United Kingdom).
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The work reported in the paper has been performed by the authors, unless clearly specified in the text. HBN, DPS, AJS, and MJS contributed to study conceptualization, methodology, and supervision. HBN and MH conducted the formal analysis. HBN drafted the original manuscript, which was critically reviewed and approved by all authors.
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Nichols, H.B., House, M.G., Yarosh, R. et al. Hypertensive conditions of pregnancy, preterm birth, and premenopausal breast cancer risk: a premenopausal breast cancer collaborative group analysis. Breast Cancer Res Treat 199, 323–334 (2023). https://doi.org/10.1007/s10549-023-06903-5
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DOI: https://doi.org/10.1007/s10549-023-06903-5