At present, there is no clear conclusion on how many years it takes for breast cancer to form, and clinically, it is generally believed that it takes about 4 years for breast cancer to form and be detected. However, there are obvious individual differences in the occurrence and development of breast cancer due to the different degrees of malignancy of the tumor cells. The formation of breast cancer may be related to genetic factors, hormones in the body, dietary habits, the time of the first menstruation, the age of menopause, women who have not given birth, and lifestyle habits. Most of the early stage breast cancer patients can be completely cured if they are detected, diagnosed and treated early. After intermediate stage breast cancer patients are treated by surgery, they need to cooperate with chemotherapy, radiotherapy, targeted drug therapy, endocrine therapy, etc., to control the growth, development and spread of the tumor, and to prevent the recurrence of the tumor. For advanced breast cancer patients, comprehensive treatment is needed to control the condition, reduce symptoms and prolong life. Advanced breast cancer patients have the potential to extend their life expectancy by 1-3 years if they are treated aggressively. Therefore, for non-breast cancer high-risk groups, it is recommended to have breast ultrasound examination once a year, and mammogram examination once a year if possible; for breast cancer high-risk groups or women with a clear family history, it is recommended to start breast screening at an earlier age (less than 40 years old), and to have mammogram examination once a year, mammogram examination once every 6-12 months, and breast enhancement MRI examination once a year if necessary. Breast Enhancement MRI.