How common is breast cancer?

Pretty common . Estimated new cases and deaths from breast cancer in the United States in 2012: new cases: 226, 870 (female); 2, 190 (male) and 39, 510 (female); 410 (male) deaths. Lifetime risk is 1 to 8. Risk is higher with the increased of age.
Lifetime risk 1 in 8. It is estimated that women in the US have a 1 in 8 lifetime risk of developing breast cancer, with the median age at diagnosis of 60. Common misconceptions include "I have no family risk" or "I am too old to get breast cancer". In truth, most cases occur in people without a family history and the incidence increases the older one gets. See: http://seer.cancer.gov/statfacts/html/breast.html.