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- Cancer of colon and rectum/polyps of colon and rectum
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Quick GuideMen's Health Pictures Slideshow: Essential Screening Tests Every Man Needs
Cancer of colon and rectum/polyps of colon and rectum
Scientists believe that majority of the colon cancers develop from colon polyps (precancerous growths on the inner surface of the colon). After turning cancerous, the cells can then invade or spread (metastasize) to other parts of the body. If these polyps are identified and removed before they turn cancerous, colon cancer can be prevented. Colon cancer is curable if it is surgically removed before the cancer spreads.
Tests or procedures for colon polyps/colon cancer
- Stool occult blood test: A fecal occult blood test is a chemical test to detect trace amounts of blood in stool. It is inexpensive and easy, though not always accurate. Some cancers are not detected with this test, and many positive tests are due to conditions other than cancer.
- Flexible sigmoidoscopy: A flexible sigmoidoscopy is a relatively quick and easy office procedure that allows direct visualization and biopsy of suspicious lesions from the distal (end) portion of the colon. The drawbacks include some discomfort and is not as thorough as colonoscopy.
- Optical colonoscopy:Optical colonoscopy is the isualization of the entire colon. This is the most complete and thorough test, but often requires IV sedation, much more expensive, and is not covered by some insurance for screening.
- Virtual colonoscopy:Virtual colonoscopy is a less invasive procedure utilizing CT scan to construct virtual images of the colon that are similar to the views of the colon obtained by direct colonoscopy. The drawbacks to virtual colonoscopy are that it cannot remove polyps, and is not as reliable as optical colonoscopy in detecting small polyps, finding flat cancers, or polyps that are not protruding.
Who to test and how often
- All healthy adults should have stool occult blood tests and flexible sigmoidoscopy at age 50 and flexible sigmoidoscopy every 5 years.
- Alternatively, instead of flexible sigmoidoscopy, all healthy persons can undergo screening colonoscopy at age 50 and then every 10 years if no prior history of polyps or cancer.
- Those at higher risk for colon cancer (individuals with family history of colon polyps and cancer, long standing ulcerative colitis, or prior personal history of colon polyps or cancer need colonoscopy earlier and at shorter intervals.
Benefits of early detection
Stool occult blood test, flexible sigmoidoscopy, and colonoscopy are documented to reduce colon cancer mortality by:
- Preventing colon cancer by identifying and removing polyps before they become cancerous; and
- Increasing the cancer cure rate by identifying early cancer at a treatable stage before the cancer has spread (metastasized).