Invasive breast cancer grade 1 refers to the histological grading. Specific treatments need to be chosen according to the clinical staging as well as the pathological type, including surgery, radiotherapy, endocrine therapy, targeted therapy and so on. 1. Surgery: Breast-conserving surgery can be used for treatment, preserving the nipple and areola and removing only the breast tissue, including the tumor site. After surgery, combined treatment with radiotherapy and chemotherapy can achieve the effect of radical cure. 2. Chemotherapy: chemotherapy is used to kill breast tumor cells, inhibit the growth and reproduction of tumor cells and promote the differentiation of tumor cells in the treatment of invasive breast cancer grade 1. However, killing tumor cells may kill normal cells and immune cells at the same time. Commonly used chemotherapy drugs are paclitaxel, cyclophosphamide and so on. 3. Radiotherapy: radiotherapy can reduce the recurrence rate of breast cancer in localized areas and improve the overall survival rate, and the irradiation program of radiotherapy should be decided by doctors according to patients’ individual conditions. 4. Endocrine therapy: including drugs such as toremifene, raloxifene, exemestane, etc. The specific choice of drugs should be determined by the doctor. 5. Targeted therapy: including Trastuzumab, Lapatinib and so on. Breast cancer grade 1 is not very serious, you can choose the above ways, under the guidance of the doctor for treatment, drugs should be applied under the guidance of the doctor.