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The Truth About Colon Cancer Screenings
Colorectal cancer (CRC) is the second leading cause of cancer-related death in men and the third in women in the United States. Screening for CRC has been quite successful. The National Polyp Study showed that removing small polyps, called adenomas, can reduce the incidence of CRC by over 75%.
Since the natural history of CRC is slow-growing, screening makes sense. It takes five to seven years for small polyps to develop and turn into a cancer. The success of colonoscopies in removing polyps has made it the gold standard for colorectal care.
Physicians and scientists have simultaneously been looking for cost-effective methods in the prevention of CRC that can be applied to the general population. The first stool tests developed were based on the finding of occult, or hidden, blood. Because the fecal occult blood test (FOBT) was not as accurate, the fecal immunochemical test (FIT) was developed.
Who should be screened?
Colon cancer screening is appropriate for:
- Adults over 50 with an average risk for colon cancer. However, newer recommendations suggest screening start in the 40s. Talk with your doctor about what is appropriate for you.
- Those with a personal history of colon cancer, polyps, or other related cancers at any age.
- Individuals with a family history of colon cancer (one or more first-degree relatives or two or more second-degree relatives) who were diagnosed with colon or rectal cancer before age 60.
- People who have had a positive result from another screening method in the last six months.
- Individuals diagnosed with a condition that places them at a higher risk for colon cancer, such as inflammatory bowel disease, ulcerative colitis, Crohn’s disease, or familial polyposis.
Some people, however, are hesitant to have a colonoscopy, fearing the preparation, or perhaps the procedure itself. For some patients, a non-invasive screening option may be offered.
Fecal Immunochemical Test (FIT)
This FIT test is specifically designed to identify human hemoglobin. Numerous clinical trials have shown that CRC screening by these FITs are successful. Unfortunately, less than half of the American population is screened for colon cancer. As such, applying these stool tests proves to be successful.
The development of DNA biomarker stool tests has raised the level of sensitivity tremendously. In these types of tests, stool is studied for pieces of DNA that are abnormal and come from either large polyps or CRC. The major advantage of a fecal DNA test, compared to colonoscopy, is that they avoid the need for a bowel preparation and there is no risk in terms of potential complications.
Cologuard, created by Exact Sciences Corporation, is a multi-target stool DNA test for colorectal screening. This test can be taken every three years and is covered by Medicare.
Tests such as Cologuard have been suggested to those who are not able to have a colonoscopy for health reasons. Blood thinners, severe medical illness, or a failed colonoscopy in the past are some examples. Some have suggested that stool DNA testing, like Cologuard, can also be used to follow up an initial colonoscopy that was negative.
What is not known, however, is how often patients should be screened with the Cologuard test. Currently, there are trials underway to determine this interval.
According to the manufacturer, the Cologuard test cost $599. This is certainly less expensive, and less invasive, than colonoscopy and does not expose patients to the radiation they would receive in a “virtual colonoscopy,” or a computed tomography (CT) colonography.
It’s estimated that colon cancer screenings with Cologuard have detected 92% of CRC cases in patients without symptoms. However, it’s also produced a substantial number of false positive results. This means that a Cologuard test could be positive, but a follow-up colonoscopy may still be negative.
Patients should follow the advice of their primary care providers for the proper CRC screening method that’s best for them.
Regardless of which option you opt for the most important thing is to begin screenings at age 50, or earlier if you have a family history of colon cancer.