The exact length of life after 8 times of chemotherapy for mid-stage breast cancer depends on the pathological staging of breast cancer, the severity and the treatment effect of breast cancer after chemotherapy, which may be more than 5 years or less than 5 years. Breast cancer is the most prevalent malignant tumor among women and is clinically divided into 4 stages. In general, stage 1-3 breast cancer can be cured after surgery. Stage 4 breast cancer has distant metastasis and cannot be removed surgically, so chemotherapy, targeted therapy, endocrine therapy and immunotherapy are required. During chemotherapy, breast cancer patients should be alert to adverse reactions and follow medical advice to use antiemetic and relieving drugs for adverse reactions in a timely manner, while avoiding infection by timely follow-up, paying attention to strengthening diet and nutrition, and maintaining a good mood.