What are the real causes of breast cancer? Who should be afraid?
Established risk factors include: female gender, age, family history, genetics, personal history of breast cancer, radiation t chest/face prior to age 30, prior history of certain benign breast lesions, white women, overweight, not having a full term pregnancy by age 30, and others.
Refer to http://www.breastcancer.org/risk/factors for more detail. This reflects the large amount of research done.