Breast malignant tumor patients can be injected 1~2 times of thymic peptide in a year, which should be determined by combining the patient’s own situation. Thymopeptide is a small molecule peptide, this drug can effectively regulate the body’s immune function, breast malignant tumor patients injected, can prompt the body to produce immunity to tumor cells, can to a certain extent to reduce the recurrence and improve the prognosis, if the body can tolerate thymus peptide, it is generally recommended that patients with breast malignant tumors injected 1~2 times a year, will have a better effect. Breast malignant tumor patients need to follow the doctor’s instructions to correctly inject thymopeptide, and should pay attention to appropriate rest and avoid spicy and stimulating diet, if the injection of thymopeptide after the fever, drowsiness, fatigue and other uncomfortable symptoms gradually aggravate, it is best to stop the drug in time for observation.