Most stage 0 carcinoma in situ can be cured. Stage 0 carcinoma in situ is the earlier stage of breast cancer, which means that the cancer cells have not yet broken through the basement membrane of the breast, and have not invaded the blood vessels and lymphatic vessels, etc. The lesion site is small, and the cure rate is relatively high, and the recurrence rate is lowered after surgery. Most of the patients with carcinoma in situ of breast can be cured by timely surgical resection without postoperative radiotherapy or chemotherapy, and they only need to undergo regular review. In addition, if the immunohistochemistry test is positive for estrogen and progesterone receptors, endocrine therapy can also be tried to help reduce the incidence of breast cancer in the other breast. The cure rate of carcinoma in situ is relatively high, and the key lies in early detection and early treatment.