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Research has shown that environment can play a big part in colon cancer development.
http://coloncancer.about.com/od/faqs/f/Environment.htm
Background: We analyzed the joint effect of environmental risk factors and family history of colorectal cancer on colon cancer.
http://cebp.aacrjournals.org/cgi/reprint/13/4/658
Environmental factors that can increase a person's risk of developing colorectal cancer.
http://coloncancer.about.com/od/environment/index_r.htm