Posted on April 19th, 2013 by Logan Lafferty
A new noninvasive screening test can detect most cases of colorectal cancer and also many precancerous polyps, potentially helping to sharply reduce the death toll from the disease, according to results of a study released on Thursday…But detecting that DNA in the stool is extremely difficult. Virtually all the DNA in the stool comes from bacteria, said Dr. David A. Ahlquist, a professor at the Mayo Clinic who helped develop the Cologuard test. Only 0.01 percent is the person’s own DNA, and of that, only a tiny fraction would be from cancerous cells, he said.
New York Times by Andrew Pollack
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