Invasive breast cancer grade 3 is usually more serious because the cancer cells have penetrated the basement membrane of the ducts or lobular follicles and invaded into the interstitium, which is a kind of malignant tumor and seriously affects the prognosis of breast cancer. The spread of cancer cells is also relatively fast, which may jeopardize the patient’s life if not treated in time. Only by choosing the suitable treatment for breast cancer patients can the condition be effectively controlled. Invasive breast cancer grade 3 may be clinical stage I, II, III or IV cancer, etc. In clinical staging of stage I and II, it is early stage cancer. Early detection and comprehensive risk assessment, and standardized treatment can achieve a survival rate of about 80%. If distant brain, lung and bone metastases have already appeared at the time of discovery, then the survival period of patients is often very short. It is recommended to follow the doctor’s advice and instructions, timely clarification and treatment, but also to build self-confidence, do not have too much mental stress. The treatment can be carried out through chemotherapy or targeted drugs, which can mainly inhibit the spread of cancer cells and thus prolong the life.