Do stage and grade of malignancy impact fertility preservation in breast cancer patients?

ABSTRACT

INTRODUCTION: The impact of cancer on basal fertility and ovarian response to stimulation has not yet been clarified. Evidence on this topic is scarce and conflicting. Aim of this study was to assess the impact of breast cancer stage and grade on the number of retrieved mature oocytes during controlled ovarian stimulation for fertility preservation. METHODS: Retrospective cohort study evaluating data on 101 stimulation cycles of women with breast cancer undergoing oocyte cryopreservation categorized according to breast cancer stage (low-stage I; high-stageII-III) and grade (low-grade G1-2; high-grade G3) using the American Joint Committee on Cancer staging system (VIII edition). RESULTS: High-stage disease was not associated with worse oocyte retrieval outcomes (median 7 vs 7, p = 0.75). High-grade disease patients showed a significantly lower antral follicle count (AFC) compared to low-grade disease patients (10 vs 13, p = 0.03), and required higher doses of FSH (2612 IU vs 2250 IU; p = 0.03) during stimulation. Median number of vitrified oocytes was 6 in low-grade disease patients and 7 in high-grade disease patients (p = 0.35). CONCLUSIONS: Stage and grade of breast cancer do not impact the number of retrieved mature oocytes. However, higher grade of breast cancer is associated with lower AFC at baseline and need for higher doses of gonadotropin during ovarian stimulation.