NCCN Breast Cancer Treatment Guidelines 1. Although patients may experience menopause during chemotherapy and for some time thereafter, most patients under the age of 35 will reintroduce menstruation within 2 years of stopping chemotherapy. 2. The reappearance of menstruation is not necessarily related to the ability to have children, especially in patients who are still on triamcinolone therapy. Conversely, the reappearance of menstruation is not necessarily associated with fertility. There is limited information on the ability to have children after chemotherapy. 3. In general, patients should not become pregnant while undergoing chemotherapy, radiotherapy or endocrine therapy. Although limited information is available, hormone-containing contraceptives are not recommended as a contraceptive measure regardless of the hormone receptor status of the patient’s tumor. 5. The available contraceptive options are intrauterine devices or other methods that prevent the union of the egg and sperm. In addition, tubal ligation or vasectomy by a sexual partner can be used for patients without fertility needs. 6.There is no exact method to completely guarantee fertility of patients after chemotherapy. 7.Patients with fertility expectations can consult a fertility specialist before chemotherapy. 8.Breast-conserving surgery is not a contraindication to breastfeeding. However, the quantity and quality of milk from the affected breast may be insufficient or may lack certain essential nutrients. Breastfeeding should not be done during chemotherapy and endocrine therapy.