[[Image:colonpolyp.gif|right|thumb|200px|Progression of colon polyp to cancer]]
[[Image:colonpolyp.gif|right|thumb|200px|Progression of colon polyp to cancer]]
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Most colon cancer start off as benign polyps of the colon. As these polyps grow, the cells in them can become abnormal, and eventually cancerous. At some point after that, they can gain the ability to invade the rest of the body and spread to distant organs.