Breast cancer CT1N0M0 is a stage I cancer. The cause of breast cancer is the abnormal proliferation of breast epithelial cells under the influence of various carcinogenic factors. In the early stage of the disease, it often manifests as painless breast swelling, enlarged axillary lymph nodes and nipple overflow, etc. In the late stage, due to the metastasis of the cancer cells, multiple organ lesions will occur, which will threaten the patient’s life safety. Breast cancer patients need to undergo breast ultrasound, molybdenum target, CT, bone scan and other examinations to assess the degree of the disease, T1 means swelling <2cm, N0 means no regional lymph node metastasis, M0 means no metastasis to distant organs, and the clinical staging is Stage I. If the patient suffers from breast cancer, he/she should immediately consult the doctor. If you are suffering from breast cancer, you should seek medical treatment immediately and follow the doctor’s instructions to avoid delaying your condition.