Non-invasive breast cancer is an early stage of breast cancer, and the treatment for non-invasive cancer is based on the specific conditions of the breast tumor. The main treatment method is surgery to remove the breast tumor. Although non-invasive breast cancer is an early stage breast cancer, not all non-invasive breast cancer lumps are small, but there are cases of non-invasive breast cancer with very large lumps. The treatment of non-invasive breast cancer, including other endocrine treatments, is based on the specific situation. If the mass is very large, we may need to do glandular or mastectomy, or breast reconstruction if necessary. This kind of non-invasive breast cancer does not need chemotherapy, but if the lump is very large or breast-conserving, some radiotherapy is needed.