Men Don't Have Breasts. How Can Men Get Breast Cancer?

Even though men do not have breasts like women, they do have a small amount of breast tissue. In fact the "breasts" of an adult man are similar to the breasts of a girl before puberty, and consist of a few ducts surrounded by breast and other tissue. In girls, this tissue grows and develops in response to female hormones, but in men -- who do not secrete the same amounts of these hormones -- this tissue does not develop.

However, because it is still breast tissue, men can develop breast cancer. In fact, men get the same types of breast cancers that women do, although cancers involving the milk producing and storing regions of the breast are very rare. According to the American Cancer Society, an estimated 1,690 cases of breast cancer will be diagnosed in men in 2005.

Why Do I Not Hear About Breast Cancer In Men As Much As I Hear About Breast Cancer In Women?

Breast cancer in men is a very rare disease. This is possibly due to their smaller amount of breast tissue and the fact that men produce smaller amounts of hormones like estrogen that are known to affect breast cancers in women.

In fact, only about 1 in 100 breast cancers affect men and only about 10 men in a million will develop breast cancer.

Which Men Are More Likely to Get Breast Cancer?

It is very rare for a man under age 35 to get breast cancer, but the likelihood of developing the disease increases with age, with most being detected between the ages of 60 - 70 years. Family history in a close female relative and a history of radiation exposure of the chest can also increase the risk.

The clearest risk for developing breast cancer seems to be in men who have had an abnormal enlargement of their breasts (called gynecomastia) in response to drug or hormone treatments, or even some infections and poisons. Individuals with a rare genetic disease called Klinefelter's syndrome, who often have gynecomastia as part of the syndrome, are especially prone to develop breast cancer. Men with severe liver disease tend to have lower levels of male hormones (androgens) and higher levels of female hormones (estrogens) putting them at an increased risk of developing gynecomastia and breast cancer.

 VitaDocs Medical Reference provided in collaboration with the Cleveland Clinic