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MicroRNAs circulating in blood show promise as biomarkers to detect pancreatic cancer
Date:9/4/2009

HOUSTON - A blood test for small molecules abnormally expressed in pancreatic cancer may be a promising route to early detection of the disease, researchers at The University of Texas M. D. Anderson Cancer Center report in the September edition of the journal Cancer Prevention Research.

The team's analysis of four microRNAs (miRNA) found in the blood plasma of pancreatic cancer patients is proof of principle to further develop a blood test for this evasive disease, said senior author Subrata Sen, Ph.D., associate professor in M. D. Anderson's Department of Molecular Pathology.

"Increased expression of microRNAs is known to be involved with specific genetic pathways and processes responsible for the development of cancer-associated changes in cells," Sen said. "Detection of elevated levels of miRNAs in blood plasma of pancreatic cancer patients as informative biomarkers of disease appears to be a promising, novel approach for developing a minimally invasive assay for detecting this disease."

There is no accurate, noninvasive way to detect pancreatic cancer, the fourth-leading cause of cancer-related deaths in the United States. Fewer than 5 percent of patients survive to five years.

MicroRNAs are single-stranded bits of RNA consisting of 18 to 24 nucleotides that regulate the messenger RNA (mRNA) expressed by genes to tell a cell's protein-making machinery what protein to make.

The four targeted microRNAs previously had been associated in varied ways with pancreatic cancer or with precancerous lesions. Expression of the four was analyzed in 28 patients with pancreatic cancer and 19 healthy people.

The four combined markers accurately identified 64 percent (sensitivity) of the pancreatic cancer cases and correctly identified 89 percent of those without disease (specificity). That degree of sensitivity and specificity are good for a pilot study but don't yet rise to the levels required for translati
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Contact: Scott Merville
smerville@mdanderson.org
713-792-0661
University of Texas M. D. Anderson Cancer Center
Source:Eurekalert

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