How long can one live after breast cancer has been removed and metastasized is affected by many factors, so there is no specific time, and it should be judged according to one’s own situation. Metastasis after breast cancer resection suggests that the cancer has recurred, and radiotherapy, targeted therapy and other comprehensive treatment programs can be carried out under the guidance of doctors. Commonly used chemotherapeutic drugs include fluorouracil, cytarabine, etc.; targeted drugs include trastuzumab, patuximab, etc. After active treatment, the tumor lesions can be significantly reduced, the progress of tumor metastasis can be inhibited, the quality of life of patients can be improved, and the survival time of patients can be prolonged. Due to individual differences, the drug is not absolutely safe and effective, need to follow the doctor’s instructions to standardize the use of adverse reactions to timely medical treatment, drug allergy is prohibited. The survival time of metastatic breast cancer after mastectomy is related to the treatment plan, the patient’s physical quality, the severity of the disease and other factors, and it is impossible to judge, it is recommended to actively cooperate with the doctor to accept the treatment to improve the prognosis of the disease.