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Risk factors
People who have cancer, including women with uterine, ovarian, and breast cancers, are at increased risk of colorectal cancer. Individuals who have been previously treated for colorectal cancer are at risk for recurrence.
Those with ulcerative colitis and Crohn's disease, among other inflammatory bowel diseases, are at increased risk of developing colorectal cancer.
Those with family members who have had colon cancer are at increased risk. Several genes are known to cause colon cancer, and there may be others not yet identified. Doctors say that a family has hereditary colorectal cancer when the exact gene causing the disease in that family has been pinpointed.
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