This document discusses breast cancer screening and prevention. It outlines three components of screening: genetic screening, breast screening, and cancer prevention. Breast screening involves breast self-examination (BSE), clinical breast examination (CBE) by a doctor, and mammograms, MRI, or ultrasound for high-risk patients. Mammography is recommended annually starting at age 40 or earlier for high-risk women. MRI may supplement mammography for those at high lifetime risk. Ultrasound can be used for dense breasts. Regular BSE and screening can find lumps earlier than no screening or occasional screening. Risk factors include obesity, lack of exercise, not breastfeeding, alcohol use, hormone therapy, and not having children. Prevention aims