Some individuals are at a higher risk from mutated genes passed down from biological ancestors; it likely requires more than one gene mutation, however. Studies suggest 5-10 percent of breast cancer may be due to two mutated genes. --American Cancer Society
Prevention strategies? Learn your family history, if at all possible. Talk with your physician about genetic studies, mammograms, and colonoscopies as indicated. Do self-breast examinations, male or female. Have an annual physical exam including a rectal; for females a pelvic exam with visualization of the cervix.