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U-M researchers discover traits of aggressive form of prostate cancer
Date:6/9/2008

ANN ARBOR, Mich. Researchers led by a team at the Michigan Center for Translational Pathology at the University of Michigan Health System have identified traits of an aggressive type of prostate cancer that occurs in about 10 percent of men who have the disease. They hope the discovery could lead, possibly within the next few years, to a simple urine test that will help to diagnose this variation of prostate cancer.

Previous studies by this group of researchers have shown that most prostate cancer is caused in part by a gene fusion the merging of two unrelated genes, which plays a role in at least 50 percent of prostate cancer cases.

To shed light on the prostate cancers that don't involve gene fusion, the researchers in the current study analyzed data on 1,800 prostate cancers to find commonalities in their genetic aberrations. They learned that a gene called SPINK1 (serine peptidase inhibitor, Kazal type 1) was over-expressed, or found in excess amounts, in prostate cancers that do not have gene fusions. The finding suggests that SPINK1 is a biomarker a molecule in bodily fluids, blood and tissue that can be a signal of a disease for a subtype of prostate cancer.

The findings, reported in the June issue of the journal Cancer Cell, also suggest that men with SPINK1related prostate cancers tend to have a quicker recurrence of the disease than those with other types of prostate cancer.

"Our study is really the first to look at what is happening molecularly with fusion-negative prostate cancers," says Scott Tomlins, Ph.D., first author of the paper and an M.D./Ph.D. student at the U-M Medical School.

"Because SPINK1 can be found non-invasively in urine, a test could be developed that would complement current urine testing that is used to detect some prostate cancer or future urine tests for gene fusions," adds senior author Arul Chinnaiyan, M.D., Ph.D., director of the Michigan Center for Translational Path
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Contact: Katie Vloet
kgazella@umich.edu
734-764-2220
University of Michigan Health System
Source:Eurekalert

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