Triple-negative breast cancer is the result of immunohistochemical examination, and T2N0M0 refers to the patient’s stage of disease. 1. Triple-negative breast cancer: Breast cancer is a malignant tumor lesion that occurs in the breast, and the cause of the disease is related to abnormal levels of estrogen and progesterone in the body. Immunohistochemical examination of excised breast lesions is called triple-negative breast cancer when estrogen receptor (ER), progesterone receptor (PR) and proto-oncogene Her-2 are all negative. This type of breast cancer lesion has a relatively poor prognosis. 2. T2N0M0 staging: in clinical work, the lesion is staged by combining the size of the lesion, the extent of invasion, the metastasis of lymph nodes, and the presence of distant metastasis. The current staging standard is TNM staging, and the patient is T2N0M0, in which, T2 indicates that the diameter of cancer is greater than 2 cm but less than or equal to 5 cm, N0 indicates that there is no regional lymph node, and M0 indicates that the patient does not have metastasis to distant organs. Combined with the examination, the patient should be actively treated with surgery under the doctor’s guidance, and then assisted with radiotherapy and other therapeutic measures after surgery to stabilize the condition as much as possible.