Pathologic classification of breast cancer includes non-invasive carcinoma, invasive carcinoma, and other rare carcinomas. 1. Non-invasive carcinoma: including intraductal carcinoma, meaning that the cancer cells have not broken through the basement membrane of the ductal wall; lobular carcinoma in situ, meaning that the cancer cells have not broken through the basement membrane of the terminal milk ducts or glandular follicles, and nipple eczema-like breast cancer. Non-invasive carcinoma belongs to early stage and has better prognosis. 2. Invasive carcinoma: It includes invasive specialized carcinoma, such as mucinous adenocarcinoma, medullary carcinoma, sweat gland-like carcinoma, tubular carcinoma, adenoid cystic carcinoma, squamous cell carcinoma, etc. It also includes invasive non-specific carcinoma. It also includes invasive non-specific carcinomas, such as invasive lobular carcinoma, simple carcinoma, invasive ductal carcinoma, dural carcinoma, adenocarcinoma and so on. 3. Other rare cancers: besides non-invasive carcinoma and invasive carcinoma, there are also some rare breast cancers, the pathologic and histologic typing of which mostly originates from the microscopic features of the tumor rather than its biological behavior, such as spindle cell carcinoma, indentation cell carcinoma and so on. Breast cancer patients should seek medical treatment in time and accept treatment actively to avoid delaying their condition.