The five-year survival rate for breast carcinoma in situ can be up to 98% and the ten-year survival rate can be up to 90%, with lower grade carcinoma in situ being somewhat better. Breast carcinoma in situ is a type of non-invasive breast cancer and is the very early stage of breast cancer. Clinical statistics of breast in situ cancer five-year survival rate is more than 98%, ten-year survival rate is more than 90%, and the survival rate of low-grade in situ cancer is a little better than high-grade. Currently, the treatment for low-grade breast carcinoma in situ is mainly breast-conserving surgery with postoperative adjuvant radiotherapy with or without endocrine therapy. Considering the good prognosis of low-grade breast cancer, some experts also recommend active clinical surveillance instead of active surgery. Patients with low-grade breast carcinoma in situ should be seen by breast surgery in a timely manner for active management.