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→Risk factors: put controversial risk factor first
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:
*Abortion / bottle-feeding: there is controvery about this, but having a history of abortion or refusing to breastfeed one's babies multiplies a woman's risk of cancer by a factor of two.
*'''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>