A malignancy in the intestine. Lymphoma , carcinoid, melanoma , fibrosarcoma, and other types of sarcoma are rare. There is no single cause of colon cancer. Factors associated with an increased risk of colon cancer are colorectal polyps , cancer elsewhere in the body, a family history of colon cancer, ulcerative colitis , granulomatous colitis , and immunodeficiency disorders . The incidence is 2 out of 1,000 people.
Most colon cancers have no symptoms.
A tool guaiac test is positive. A colonoscopy with biopsy shows cancer . A sigmoidoscopy with biopsy shows cancer. Surgical resection of the affected part of the colon is the primary treatment alternative. See cancer - support group .