Abstract
Purpose
To assess the impact of fertility preservation (FP) requiring ovarian stimulation on breast cancer outcomes and pregnancy after breast cancer.
Methods
Women aged ≤ 40 years diagnosed with stage I–III breast cancer between 2007 and 2018 and referred for FP consultation prior to systemic therapy were identified from a British Columbia fertility center database. The primary endpoint was invasive breast cancer-free survival (iBCFS) and secondary endpoints were overall survival (OS) and achievement of pregnancy. Survival and pregnancy endpoints were compared using Cox and logistic regression analyses, respectively, for patients who did and did not undergo FP.
Results
The study included 153 patients, with 71 (46%) in the FP group and 82 (54%) in the non-FP group. Patients who underwent FP were more likely to be ECOG 0 (99% vs. 88%, p = 0.011) and receive chemotherapy (93% vs. 67%, p < 0.001), but had similar ER positivity status to non-FP patients (70% vs. 79%, p = 0.21). Over a median follow-up of 4.1 years, there were no differences in iBCFS (HR 1.006, 95% CI 0.416–2.438, p = 0.988) or OS (HR 0.789, 95% CI 0.210–2.956, p = 0.725) between FP and non-FP groups. Patients who underwent FP had higher odds of conceiving at least once (OR 3.024, 95% CI 1.312–6.970, p = 0.008).
Conclusion
At a median follow-up of 4.1 years, FP did not impact iBCFS or OS, supporting its safety in young women with breast cancer. In addition, patients who underwent FP were more likely to become pregnant after breast cancer, highlighting the value of pre-oncologic treatment FP in survivorship family planning.
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Data availability
The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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All authors contributed to the study conception and design. Data collection was performed by YW, MT, CL, YHX, and SL. Data analysis was performed by YW and MT. The first draft of the manuscript was written by MT and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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This study was performed in line with the principles of the Declaration of Helsinki. Approval was granted by the University of British Columbia Research BC Cancer Research Ethics Board (No. H14-03334).
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Wang, Y., Tesch, M.E., Lim, C. et al. Risk of recurrence and pregnancy outcomes in young women with breast cancer who do and do not undergo fertility preservation. Breast Cancer Res Treat 195, 201–208 (2022). https://doi.org/10.1007/s10549-022-06650-z
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DOI: https://doi.org/10.1007/s10549-022-06650-z