GNRH1 and breast cancer: When considering this CQ, we intended to assist health care providers in providing women with breast cancer with the most current information on embryo (fertilized oocyte) cryopreservation, unfertilized oocyte cryopreservation, ovarian tissue cryopreservation, and ovarian suppression with a gonadotropin-releasing hormone (GnRH) agonist as fertility preservation options that can be used before initiation of breast cancer treatment.