Pre-cancerous breast cancer can be cured. Pre-cancerous breast cancer and carcinoma in situ, when the cancer has not broken through the basement membrane, which is stage I according to the TNM staging, can be cured through complete excision of the lump by surgery, which will not affect the life expectancy. However, after the surgery, it is necessary to check the breast ultrasound and tumor markers regularly to prevent recurrence and metastasis, and if recurrence occurs, it can be detected and treated as early as possible. In addition, dietary attention should be paid to avoiding foods with high fat content, eating less fatty meat, appropriate sports, and active exercise to reach the weight standard, these measures can also prevent the recurrence of breast cancer.