The staging of breast cancer is called TNM staging; T is for primary cancer, N is for regional lymph nodes, and M is for distant metastases. In addition, TRS is called carcinoma in situ, which refers to non-progressive breast cancer and breast cancer without breast lump detection, T is divided into T1-T4, which is based on tumor size, generally T1 is less than or equal to 2cm, T2 is greater than or equal to 2cm, less than or equal to 5cm, T3 is greater than 5cm, T4 is cancer tumor regardless of size, but has invaded the skin and chest wall, inflammatory breast cancer also belongs to T4. In addition, N is divided into N0-N3, N0 has no axillary lymph node metastasis, N1 has axillary lymph node metastasis and can be pushed, N2 has ipsilateral axillary lymph node metastasis and adhesion with surrounding tissues, N3 has ipsilateral parasternal lymph node metastasis or ipsilateral supraclavicular lymph node metastasis, M is divided into M0 and M1, M0 has no distant metastasis, M1 has distant metastasis. This staging is divided into is stages 0-4, generally stage 0, which is TRS, N0 and M0. stage 1 is T1, N0 and M0. stage 4 is including any TN, M1. staging of the breast provides a basis for late treatment.