Breast cancer is a common malignant tumor of the breast, accounting for 90% or more of malignant tumors of the breast. The most common clinical symptom of breast cancer is painless breast lump, which usually occurs in the outer upper quadrant of bilateral breast, hard, poorly defined and poorly mobile. When the lump increases in size or metastasizes to the axillary lymph nodes, it may cause local breast swelling and pain. When the tumor metastases to the liver, it may cause pressure pain, swelling pain and loss of appetite in the liver area. Metastasis to bones may cause pain of metastatic lesions in bones. Metastasis to the skull may cause headache, jet vomiting and optic nerve papilledema. In addition, there is also breast malignant tumor is breast sarcoma, which is a relatively rare breast malignant tumor, accounting for only about 5% of malignant tumors, also manifested as breast lumps, but this kind of breast sarcoma is less effective for conventional treatment such as radiotherapy and chemotherapy.