Multidisciplinary Shared Decision Making of Fertility Preservation in Young Women With Breast Cancer

Inclusion Criteria: * Women aged 19 to 40 years old * A person diagnosed with breast cancer by biopsy * Those who don't have evidence of distant metastasis * Eastern Cooperative Oncology Group(ECOG) performance status: 0-2 score * Before registering for clinical trials, chemotherapy, radiation therapy, anti-hormone therapy, immunotherapy, and surgery are not performed * A person who has fully understood and listened to the explanation of this clinical trial and then gave written consent Exclusion Criteria: * Histologically, a person diagnosed with follicular or sarcoma * Those with a history of breast cancer (including recurrent breast cancer) * A person diagnosed with another cancer before breast cancer * A person diagnosed with metastatic breast cancer * A person who has a mental illness and has a hard time understanding clinical trials * Those who plan to conduct follow-up observation elsewhere(to change of hometowm) * Menopausal factors without menstruation after more than a year from the last menstrual date * A pregnant woman * Inappropriate for participation in clinical trials