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Less-invasive tests added to colon cancer screening

Medical coalition hopes that more will take part

Email|Print| Text size + By Mike Stobbe
Associated Press / March 6, 2008

ATLANTA - Medical specialists recommended yesterday that a less-invasive procedure known as a virtual colonoscopy and a stool DNA test join the arsenal of tests for colon cancer, in hope of increasing screening.

The recommendations bring to six the number of tests suggested for spotting signs of colon cancer, said Dr. Otis Brawley, national chief medical officer of the American Cancer Society, one of the groups that made the recommendations.

The tests range in price from a few dollars to several hundred. Which test is best for patients depends on several factors, including what is covered by insurance and the preference of their primary care doctor, specialists say.

Only one company has a stool DNA test on the market: EXACT Sciences Corp. of Marlborough, Mass. The medical groups delayed releasing the recommendations until markets closed yesterday, because they were concerned it would affect trading, Brawley said.

The recommendations may also mean more business for radiologists. There has been something of a turf battle between gastroenterologists, who perform colonoscopies, and radiologists, who handle virtual colonoscopies.

The new guidelines represent an agreement that both are valuable ways to diagnose and prevent colon cancer, Brawley said.

The recommendations came out the same day as a medical study that found that flat growths on the colon wall are more common than previously thought. Researchers concluded that the growths are more likely to be cancerous than the more familiar knobby masses known as polyps.

The study, published in the Journal of the American Medical Association, suggested that more careful colorectal cancer screening is necessary. However, Brawley said the release of the new recommendations was coincidental and not driven by the study's findings.

Colorectal cancer is the nation's second-leading cancer killer. It will kill about 50,000 people in the United States this year, the Cancer Society estimates. Screenings are designed to find growths before they turn cancerous.

Traditional colonoscopies, long considered the gold standard for testing, are recommended every 10 years, starting at age 50. A doctor snakes a long, thin tube equipped with a small video camera through the large intestine to view the lining. The doctors also can use the device to cut away a tissue sample or remove a polyp.

However, colonoscopies come with risks, including a chance that a doctor will accidentally puncture the colon. Also, many people have balked at getting screened because the test is expensive and they perceive it as unpleasant.

A virtual colonoscopy is a sort of super X-ray of the colon and rectum. Air is pumped into the colon to stretch it, and then a special CT scan is done. It is not invasive, but if a polyp is found, doctors will have to perform an optical colonoscopy in order to take a biopsy.

All colon cancer deaths can be averted through screening and early treatment, but only 30 percent of people recommended to get screenings actually do, according to the Cancer Society.

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