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Study affirms value of epigenetic test for markers of prostate cancer
Date:5/28/2014

A multicenter team of researchers report that a commercial test designed to rule out the presence of genetic biomarkers of prostate cancer may be accurate enough to exclude the need for repeat prostate biopsies in many if not most men.

"Often, one biopsy is not enough to definitively rule out prostate cancer," says study researcher Jonathan Epstein, M.D., director of the Division of Surgical Pathology and a professor of pathology, urology and oncology at the Johns Hopkins University School of Medicine. "Our research finds that by looking for the presence or absence of cancer in a different way, we may be able to offer many men peace of mind without putting them through the pain, bleeding and risk of infection that can come with a repeat biopsy."

The new research, called the Detection of Cancer Using Methylated Events in Negative Tissue (DOCUMENT) study, suggests that an initial biopsy complemented with an epigenetic diagnostic test accurately rules out the existence of cancer up to 88 percent of the time. The test, developed by MDxHealth, which paid for the study, was described online in April in The Journal of Urology.

The test specifically captures the presence of chemical modifications to non-nuclear DNA sequences within cells that commonly appear when prostate cancer is present. These so-called epigenetic changes, which add a methyl group to the biochemical makeup of the DNA, alter the way genes function without changing their foundational DNA sequence. The researchers analyzed tissue from biopsies from 320 men with elevated prostate-specific antigen (PSA) levels whose results were negative for prostate cancer. The men were patients at The Johns Hopkins Hospital; the University of California, Los Angeles; the Cleveland Clinic; Eastern Virginia Medical School; and Lahey Hospital & Medical Center.

The epigenetic biomarkers the test detects reflect a process called DNA hypermethylation, in which a methyl group
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Contact: Stephanie Desmon
sdesmon1@jhmi.edu
410-955-8665
Johns Hopkins Medicine
Source:Eurekalert

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