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Line 4: − + − − Many factors may potentially 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> − *'''Diet''' <ref> http://unisci.com/stories/20021/0104023.htm </ref> − *'''Race/ethnicity''': not a strong risk factor in the development of breast cancer, but affects time of diagnosis, and access to care.<ref> http://www.womenshealthnetwork.org/advocacy/wocbreastca/natam.htm </ref> − *'''Benign breast disease''' confers a slightly higher risk − *'''Obesity''': this is a more significant risk factor in postmenopausal women. Before menopause, the effect is unclear. <ref> http://society.guardian.co.uk/cancer/story/0,,686105,00.html </ref> − *'''Family history''' if such a history involves having several generations affected by breast cancer or having many relatives diagnosed with breast cancer at less than 50 years old <ref> http://www.breastcancer.org/cmn_who_indrisk.html </ref> − *'''Abortion''': There is some controversy as to whether abortion increases the risk of breast cancer. <ref>http://www.cancercouncil.com.au/editorial.asp?pageid=245</ref> − *'''Prolonged uninterrupted exposure to estrogen''' (e.g. by having an early [[menarche]] and late [[menopause]] or by having no full-term pregnancies).<ref> http://www.breastcancer.org/cmn_who_indrisk.html </ref> − *'''Personal history of breast cancer'''
Undo revision 99874 by Special:Contributions/Palmd001 (User talk:Palmd001)
==Introduction==
==Introduction==
==Risk factors==
==Risk factors==
==Ways of reducing the risk==
==Ways of reducing the risk==