The five-year survival rate of breast cancer stage 3C is about 50-60%, and the specific situation should be related to various factors such as the patient’s treatment results, physical condition, etc., and cannot be generalized. Stage 3C breast cancer usually belongs to the middle or late stage of breast cancer, indicating that breast cancer patients with lymph node metastasis or invasion of surrounding tissues, chest muscle, chest wall and skin or lymph nodes with obstruction and adhesion generally belong to stage 3C breast cancer. Intermediate and late-stage breast cancer patients should actively cooperate with doctors for surgical treatment, and after surgery, they need to combine chemotherapy, radiotherapy, targeted drug therapy, endocrine therapy, etc., in order to control the condition, alleviate the symptoms and prolong the life. Through comprehensive treatment measures, as long as the growth, development and spread of the tumor can be controlled, patients can prolong their lives, and the average 5-year survival rate is around 50-60%. In daily life, patients should maintain a good mood, avoid long-term psychological burden and anxiety and panic, eat a light diet, and can exercise appropriately. Keep an eye on the body changes in normal times. It is suggested that breast cancer patients should consult regular hospitals in time and standardize the treatment under the guidance of doctors, so as to avoid delaying the condition.