Fertility after breast cancer.

Breast cancer is the most common tumor in childbearing women. In the last decades, considerable improvement in breast cancer-related death has been achieved with adjuvant therapies (chemotherapy, endocrine and targeted therapies, radiotherapy) but at cost of significant long-term sequels, including infertility. Reproductive issues are of great importance to young women, in particular for those who did not complete their families before breast cancer diagnosis: patients should be adequately informed at the time of diagnosis about the risk of infertility and the available methods for fertility preservation. This review will focus on incidence and impact of infertility secondary to breast cancer treatment, the available options for ovarian function preservation, including embryo and oocyte cryopreservation, ovarian tissue cryopreservation, and ovarian suppression with gonadotropin-releasing hormone agonists. We will also discuss the optimal time of subsequent pregnancy, the potential risks for the mother and the fetus, and the impact of therapies on breastfeeding.