[Pregnancy after breast cancer].
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Breast cancer is the most common cancer among women of childbearing age. Despite potentially gonadotoxic treatments, fertility following breast cancer treatment remains satisfactory. Oncofertility has advanced, and an increasing number of patients benefit from oocyte or embryo cryopreservation techniques. Nevertheless, the majority of pregnancies occur spontaneously. Pregnancy does not increase the risk of recurrence, nor does it decrease the overall survival of women, regardless of nodal status or hormone receptor status. Obstetrically, women treated for breast cancer achieve as many live births as the general population, despite an increased incidence of obstetric complications. Breastfeeding is possible and does not appear to affect survival or increase the risk of recurrence. Thus, the most recent data are reassuring regarding the possibility and safety of pregnancy after breast cancer. However, questions remain concerning the management of treatments in the context of a desire for pregnancy. The benefit of combining GnRH agonists with chemotherapy to improve pregnancy chances is being questioned. The interruption period for tamoxifen in an adjuvant setting needs clarification. Finally, new data are required for patients treated with immunotherapy, PARP inhibitors, or cell cycle cyclin inhibitors.