Abstract
Purpose
To evaluate whether previous ovarian removal concomitant with benign hysterectomy improves prognosis in a cohort of women with breast cancer.
Methods
In this nationwide register-based cohort study, risk of recurrence and mortality were examined in 4563 women with invasive breast cancer and previous bilateral salpingo-oophorectomy (BSO) concomitant with benign hysterectomy, during 1977–2018. Comparing with benign hysterectomy alone, hazard ratios (HRs) and 95% confidence intervals (CIs) were evaluated by Cox-proportional hazards regression models. Analyses were stratified on age at hysterectomy as a proxy for menopausal status (< 45, 45–54 and ≥ 55 years); tumor characteristics, estrogen receptor (ER)-status, and use of hormone therapy (HT) were included in multivariable models.
Results
Compared with hysterectomy alone, premenopausal (< 45 years) BSO at benign hysterectomy was associated with an age and calendar period adjusted HR of 1.48 (95% CI 0.83–2.65) for breast cancer recurrence within 10 years of follow-up, a HR of 1.07 (95% CI 0.66–1.72) for overall mortality after breast cancer, and a HR of 0.59 (95% CI 0.26–1.32) for breast cancer-specific mortality. The corresponding HRs for postmenopausal (≥ 55 years) BSO at benign hysterectomy were 1.51 (95% CI 0.73–3.12) for recurrences, 1.34 (95% CI 0.74–2.44) for overall mortality, and 1.78 (95% CI 0.74–4.30) for breast cancer mortality. Adjusting for tumor characteristics, ER-status and HT did not alter the results.
Conclusion
Results from this cohort study did not indicate an improvement in breast cancer prognosis when removing the ovaries at benign hysterectomy prior to the cancer diagnosis.
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Data availability
The datasets generated and analyzed during the current study are not publicly available, since the authors do not have permission to share the data.
Abbreviations
- BSO:
-
Bilateral salpingo-oophorectomy
- CI:
-
Confidence interval
- CBC:
-
Contralateral breast cancer
- DBCG:
-
Danish Breast Cancer Group
- ER:
-
Estrogen receptor
- ER+:
-
Estrogen receptor positive
- ER−:
-
Estrogen receptor negative
- HR:
-
Hazard ratio
- HT:
-
Hormone therapy
- ICD:
-
International Classification of Diseases
- N:
-
Number
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Acknowledgements
The authors would also like to express their gratitude to the Danish Clinical Quality Program (National Clinical Registries (RKKP)) and to the Danish Breast Cancer Group (DBCG). This study was supported by The Mermaid Project, the Danish Cancer Society’s Scientific Committee (KBVU) and Lilly and Herbert Hansen’s Foundation.
Funding
This work was supported by The Mermaid Project (Mermaid 3), the Danish Cancer Society’s Scientific Committee (KBVU) (Grant No. R167-A11019-17-S2) and Lilly and Herbert Hansen’s Foundation (Jr.no. 0145).
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All authors contributed to the study conception and design. LM and MG reviewed the literature and provided input to design and data analyses. Data analyses were performed by JHV. The first draft of the manuscript was written by MG and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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LM has an immediate family member who is employed at Novo Nordisk, and an immediate family member who owns stocks in Novo Nordisk. The other authors have no conflicts of interest to declare.
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Gottschau, M., Kjær, S.K., Viuff, J.H. et al. Ovarian removal and subsequent breast cancer prognosis: a nationwide cohort study. Breast Cancer Res Treat 197, 583–591 (2023). https://doi.org/10.1007/s10549-022-06825-8
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DOI: https://doi.org/10.1007/s10549-022-06825-8