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Biomarker identification may lead to new noninvasive test for colorectal cancer detection
Date:6/6/2013

Philadelphia, PA, June 7, 2013 The average 5-year survival for colorectal cancer (CRC) is less than 10% if metastasis occurs, but can reach 90% if detected early. A new non-invasive test has been developed that measures methylation of the SDC2 gene in tissues and blood sera. This test detected 87% of all stages of colorectal cancer cases (sensitivity) without significant difference between early and advanced stages, while correctly identifying 95% of disease-free patients (specificity). The results are published in the July issue of The Journal of Molecular Diagnostics.

According to the US Centers for Disease Control and Prevention, CRC is the second leading cancer killer in the US affecting both men and women. In 2009, close to 137,000 people in the US were diagnosed with CRC, with close to a 40% mortality rate.

There are other screening choices for CRC, including fecal occult blood testing (FOBT), fecal immunochemical testing, and colonoscopy. Colonoscopy is the gold standard of CRC screening, but patient resistance mostly due to the unpleasant preparation has curbed widespread adoption. FOBT is non-invasive but has limited sensitivity, particularly for early disease. A sensitive and specific non-invasive test using blood or stool could to be a more preferable option with the potential of saving many lives.

In their search for a biomarker that could be used for the early detection of CRC, investigators from Genomictree, Inc. and Yonsei University College of Medicine in Seoul, South Korea, performed DNA microarray analysis coupled with enriched methylated DNA using tissues from primary tumors and non-tumor tissues from 12 CRC patients. After step-wise filtering, they found a set of genes that were highly methylated across all of the CRC tumors. Ultimately they identified one gene, SDC2, which encodes the membrane syndecan-2 protein, a protein that is known to participate in cell proliferation, cell migration, and is express
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Contact: David Sampson
jmdmedia@elsevier.com
215-239-3171
Elsevier Health Sciences
Source:Eurekalert

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