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The stool DNA test "has potential, but it's an evolving technology," LeFevre said. "It's also likely to have a very high cost."
Also in Tuesday's journal are the results of a study that found a newer version of the DNA test was better than an older version or a stool blood test in finding cases of cancer.
For virtual colonoscopy, the task force expressed concerns about radiation exposure a patient would receive every five years from it, but acknowledged that the level is relatively low compared to other kinds of X-rays. They also worry that it will pick up blips inside and outside the colon that end up being nothing -- but lead to more follow-up tests.
A member of the American College of Radiology Colon Cancer Committee said it was "surprising and unfortunate that such a well respected group would not come out and endorse CT colonography."
"The science is behind us that it works and it works well," said Dr. Judy Yee of the University of California, San Francisco, who has been involved in virtual colonoscopy research. "The goal is to get more Americans screened, and this is counterproductive to that goal."
The task force's guidelines could affect whether insurers and Medicare decide to pay for the test, Yee said. The cost of virtual colonoscopy can vary widely but it's generally much cheaper than a traditional colonoscopy, which can run several thousand dollars. If growths are found in a virtual colonoscopy, a traditional colonoscopy is need to remove them.
The task force will review its recommendations in five years and may make changes if more research emerges, LeFevre said.
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Annals of Internal Medicine: http://www.annals.org/
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