After looking at the treatment of stage 1, 2 and 3 breast cancer, let’s look at how to treat stage 4 breast cancer. When breast cancer cells have spread to other parts of the body, such as the liver, lungs, bones, or brain, it is called stage 4 breast cancer. Chemotherapy can kill all the fast-growing cells, so besides cancer cells, hair, blood cells, or mucous membrane of the gastrointestinal tract will also be affected by the drug. Targeted therapy can also be considered if the patient’s cancer cells are HER-positive on the surface. Targeted therapy attacks specific cells, targeting breast cancer cells. If the test reveals that the cancer cells are ER or PR positive on the surface, hormone therapy should be used to block the hormonal stimulation of the cancer cells. Radiation therapy can also be used to relieve the discomfort caused by metastatic tumors. For example, metastatic tumors in the brain can increase brain pressure, resulting in headaches and discomfort, so radiation therapy can be used to reduce the size of the tumor and lower the brain pressure with steroids. Radiation therapy is also commonly used to relieve the pain caused by metastatic tumors in the bones. The treatment outcome of stage IV breast cancer is no better than that of early stage breast cancer. Therefore, we still have to remind you again and again that if you are worried about having breast tumor, having family history, or having risk factors for breast cancer, you must have regular breast examination. Early diagnosis and early treatment.