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==Introduction==

==Introduction==

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.

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==