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Epidemiology

Risk-reducing mastectomy and breast cancer mortality in women with a BRCA1 or BRCA2 pathogenic variant: an international analysis

Abstract

Background

Risk-reducing mastectomy (RRM) is offered to women with a BRCA1 or BRCA2 pathogenic variant, however, there are limited data on the impact on breast cancer mortality.

Methods

Participants were identified from a registry of women with BRCA1/2 pathogenic variants. We used a pseudo-randomised trial design and matched one woman with a RRM to one woman without a RRM on year of birth, gene, and country. We estimated the hazard ratio (HR) and 95% confidence intervals (CI) for dying of breast cancer in the follow-up period.

Results

There were 1654 women included; 827 assigned to the RRM arm and 827 assigned to the control arm. After a mean follow-up of 6.3 years, there were 20 incident breast cancers (including 15 occult cancers) and two breast cancer deaths in the RRM arm, and 100 incident breast cancers and 7 breast cancer deaths in the control arm (HR = 0.26; 95% CI 0.05–1.35; p = 0.11). The probability of dying of breast cancer within 15 years after RRM was 0.95%.

Conclusions

In women with a BRCA1 or BRCA2 pathogenic variant, RRM reduces the risk of breast cancer, and the probability of dying of breast cancer is low.

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Fig. 1: Breast Cancer Incidence.

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Data availability

All data are original, and consent was not obtained from participants to make data externally available.

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Acknowledgements

We are grateful for the contributions of the women who participated in this study, without whom this research would not be possible. We are thankful for the support of the Peter Gilgan Centre for Women’s Cancers at Women’s College Hospital in partnership with the Canadian Cancer Society. SAN is the recipient of a Tier I Canada Research Chair. This work was supported by a Canadian Institute of Health Research. We acknowledge the study staff, students, and volunteers who assisted with data collection and data entry: Ellen MacDougall, Shana Kim, Clotilde Ngwa, Aiman Syeda, Anasua Kundu, Nurun Nahar, Abigail Sims, Alexandra Parco, Christine Zhu, Cindy Zhang, Elizabeth Hall, Lisa Asbroek, Rebecca Raj, Izzar Linares, Shaelyn Laurie, Kamrun Urmi, Amina Mahmood, Mayra Gholizadeh, Nazia Awan, Neelam Dehal, Pooja Chaudhary, Pooja Patel, Yasmin Tehrani, Seetha Venkatewsaran, Seema Mehta, Jasdeep Brar, Marsela Supriadi, Jenani Anantharajah, Grace Li, Hannah Horvath, Laavanya Somasundaram, Anne Matip, Forough Armaghan, Mohamed Bekkouche, Yasaman Ghazi, Qadriy Naimi, Liao Jia, and Li Quan.

Funding

This study was funded through the Canadian Institutes of Health Research and the Peter Gilgan Centre for Women’s Cancers at Women’s College Hospital.

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Contributions

Concept and design—KM, SN. Data accrual—TH, JG, JK, RK, PM, TP, AA, AE, BK, LB, NT, OO, DZ, CFS, WF, FC, SLN, CE, JL. Drafting of manuscript—KM, SN. Statistical analysis—PS, SN. Final approval of manuscript—all authors.

Corresponding author

Correspondence to Steven A. Narod.

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Competing interests

The authors declare no competing interests.

Ethics Approval and Consent to Participate

This study was approved by the Research Ethics Board at Women’s College Hospital, and consent was obtained from participants. The study was performed in accordance with the Declaration of Helsinki.

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Metcalfe, K., Huzarski, T., Gronwald, J. et al. Risk-reducing mastectomy and breast cancer mortality in women with a BRCA1 or BRCA2 pathogenic variant: an international analysis. Br J Cancer 130, 269–274 (2024). https://doi.org/10.1038/s41416-023-02503-8

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