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New prostate cancer test gives more accurate diagnosis
Date:4/6/2011

CHICAGO --- In a large multi-center clinical trial, a new PSA test to screen for prostate cancer more accurately identified men with prostate cancer -- particularly the aggressive form of the disease -- and substantially reduced false positives compared to the two currently available commercial PSA tests, according to newly published research from Northwestern Medicine.

The only currently available Food and Drug Administration-approved screening tests for prostate cancer result in a high number of false positives and lead to unnecessary biopsies and possible over-detection and over-treatment of indolent cancer which never would have caused suffering or death.

PSA stands for prostate-specific antigen, a substance whose elevated levels can indicate prostate cancer but can also be caused by prostate inflammation or enlargement or other conditions. Its lack of specificity can result in unnecessary biopsies.

"This new test is more specific and accurate than the currently available blood tests for early prostate cancer detection," said lead investigator William Catalona, M.D., director of the clinical prostate cancer program at the Robert H. Lurie Comprehensive Cancer Center of Northwestern University. "This will focus on the detection of more life-threatening prostate cancers and reduce unnecessary biopsies in men 50 years of age and older."

Catalona, known as the father of the PSA screening, was the first to show in 1991 that a simple blood test measuring PSA levels could be used to detect prostate cancer. He is a professor of urology at Northwestern's Feinberg School of Medicine and a urologist at Northwestern Memorial Hospital.

The study, which will be published in the May issue of the Journal of Urology, followed 900 patients from 10 sites, including Northwestern. The results showed the new screening test, a simple blood test called the Pro-PSA test, is particularly useful for patients with a normal prostate
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Contact: Marla Paul
marla-paul@northwestern.edu
312-503-8928
Northwestern University
Source:Eurekalert

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