1.People who have a family history of cancer, especially if their mother or sister has had breast cancer; 2.People whose first menstruation is under 12 years old and whose age of menopause is over 55 years old; 3.People who have certain benign breast diseases; 4. Those who frequently receive X-rays or chest radiographs; 5. Those who have never breast-fed, never had children or had children too late or had many miscarriages; 6. Women with high breast density and a solid texture; 7. Women who are particularly obese above the waist and whose waist circumference is similar to their hip circumference.