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Gut microbiome analysis improved noninvasive colorectal cancer screening
Date:8/6/2014

PHILADELPHIA Analysis of the gut microbiome more successfully distinguished healthy individuals from those with precancerous adenomatous polyps and those with invasive colorectal cancer compared with assessment of clinical risk factors and fecal occult blood testing, according to data published in Cancer Prevention Research, a journal of the American Association for Cancer Research.

"A person's gut microbiome is the collection of all the bacteria in their gut," said Patrick D. Schloss, PhD, associate professor in the Department of Microbiology and Immunology at the University of Michigan in Ann Arbor. "The number of bacteria in the gut is huge; it outnumbers the number of cells in our bodies 10 to one, and the diversity of the bacteria present is critical to our health. By sequencing the V4 region of the 16S rRNA gene we were able to identify the bacteria present in each individual's gut microbiome.

"We found that the composition of the gut microbiome allowed us to identify who in our study had precancerous adenomatous polyps and who had invasive colorectal cancer," continued Schloss. "If our results are confirmed in larger groups of people, adding gut microbiome analysis to other fecal tests may provide an improved, noninvasive way to screen for colorectal cancer."

By analyzing stool samples from 90 individuals30 healthy individuals, 30 patients with precancerous adenomatous polyps, and 30 patients with invasive colorectal cancerSchloss and his colleagues established that the composition of the gut microbiome was different for individuals in the three groups.

Using this information, they identified gut microbiome signatures for each group. Adding analysis of these signatures to assessment of age and race, which are clinical risk factors for precancerous adenomatous polyps, improved prediction of the presence of precancerous adenomatous polyps 4.5-fold. Adding analysis of the gut microbiome signatures to assessment o
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Contact: Jeremy Moore
jeremy.moore@aacr.org
215-446-7109
American Association for Cancer Research
Source:Eurekalert

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