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Line 11: − *'''Gender''': Breast cancer occurs 100 times more frequently in women than in men.
100 times more frequently
'''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>.
'''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.
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 occurs 100 times more frequently in women than in men.
==Risk factors==
==Risk factors==
Many factors affect the incidence of breast cancer in any given population of women including:
Many factors affect the incidence of breast cancer in any given population of women including:
*'''Age''': this is a complex relationship, with the steepest rise in diagnosis occurring between the ages of 40 and 60, however pre- and post-menopausal breast cancers tend to behave differently. Increasing age increases the risk that at some point in her life a woman will contract breast cancer, rising from 1 in 231 (0.5% risk) aged under 40 to 1 in 7 at age 90. <ref> http://www.breastcancer.org/cmn_who_indrisk.html </ref>.<ref> http://www.breastcancer.org/cmn_who_indrisk.html </ref>
*'''Age''': this is a complex relationship, with the steepest rise in diagnosis occurring between the ages of 40 and 60, however pre- and post-menopausal breast cancers tend to behave differently. Increasing age increases the risk that at some point in her life a woman will contract breast cancer, rising from 1 in 231 (0.5% risk) aged under 40 to 1 in 7 at age 90. <ref> http://www.breastcancer.org/cmn_who_indrisk.html </ref>.<ref> http://www.breastcancer.org/cmn_who_indrisk.html </ref>
*'''Diet''' <ref> http://unisci.com/stories/20021/0104023.htm </ref>
*'''Diet''' <ref> http://unisci.com/stories/20021/0104023.htm </ref>