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==Introduction==

==Introduction==

'''Breast cancer''' is the most common female cancer in the United States, the second most common cause of cancer death in women, and the main cause of death in women ages 45 to 55 {{fact}}. The most important risk factors are family history and hormonal factors.  The term "breast cancer" itself refers to a number of distinct disease entities. Breast cancer also occurs in men, but far less frequently.

Aside from non-melanoma skin cancer '''Breast cancer''' is the most common female cancer in the United States , the second most common cause of cancer death in women, and the one of the leading causes of death in women of all ages <ref>[http://www.cdc.gov/cancer/breast/statistics/ CDC Breast Cancer Statistics]</ref>. The most important risk factors are family history and hormonal factors.  The term "breast cancer" itself refers to a number of distinct disease entities. Breast cancer also occurs in men, but far less frequently.

==Risk factors==  

==Risk factors==