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New early detection test for prostate cancer

Date:
September 25, 2013
Source:
University of Michigan Health System
Summary:
A new urine test that improves on PSA screening for prostate cancer is now available. The test incorporates three specific markers that could indicate cancer and studies have shown that the combination is far more accurate than PSA alone.

More than 1 million men will undergo a prostate biopsy this year, but only about one-fifth of those biopsies will result in a cancer diagnosis.

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The reason is that the traditional prostate cancer screening test – a blood test to measure prostate specific antigen, or PSA – does not give doctors a complete picture.

Now, the University of Michigan Health System has begun offering a new urine test called Mi-Prostate Score to improve on PSA screening for prostate cancer. The test incorporates three specific markers that could indicate cancer and studies have shown that the combination is far more accurate than PSA alone.

“Many more men have elevated PSA than actually have cancer but it can be difficult to determine this without biopsy. We need new tools to help patients and doctors make better decisions about what to do if serum PSA is elevated. Mi-Prostate Score helps with this,” says Scott Tomlins, M.D., Ph.D., assistant professor of pathology and urology at the University of Michigan.

Researchers validated the new test on nearly 2,000 urine samples. Mi-Prostate Score, or MiPS, was significantly more accurate than PSA alone for predicting cancer as well as predicting aggressive prostate cancer that is likely to grow and spread quickly.

Mi-Prostate Score developed from a discovery in the lab of Arul Chinnaiyan, M.D., Ph.D., in 2005 of a genetic anomaly that occurs in about half of all prostate cancers, an instance of two genes changing places and fusing together.

This gene fusion, T2:ERG, is believed to cause prostate cancer. Studies in prostate tissues show that the gene fusion almost always indicates cancer.

The new urine test looks for the T2:ERG fusion as well as another marker, PCA3. This is combined with serum PSA measure to produce a risk assessment for prostate cancer. The test also predicts risk for having an aggressive tumor, helping doctors and patients make decisions about whether to wait and monitor test levels or pursue immediate biopsy.

“This combination test is not designed to say definitively at diagnosis whether a man has aggressive prostate cancer, but it can provide a more accurate estimate of the likelihood of having cancer and the likelihood of that cancer being aggressive,” Tomlins says.

The test is available to anyone but requires a request from a doctor.

Prostate cancer statistics: 238,590 Americans will be diagnosed with prostate cancer this year and 29,720 will die from the disease, according to the American Cancer Society.


Story Source:

The above story is based on materials provided by University of Michigan Health System. Note: Materials may be edited for content and length.


Cite This Page:

University of Michigan Health System. "New early detection test for prostate cancer." ScienceDaily. ScienceDaily, 25 September 2013. <www.sciencedaily.com/releases/2013/09/130925130303.htm>.
University of Michigan Health System. (2013, September 25). New early detection test for prostate cancer. ScienceDaily. Retrieved November 28, 2014 from www.sciencedaily.com/releases/2013/09/130925130303.htm
University of Michigan Health System. "New early detection test for prostate cancer." ScienceDaily. www.sciencedaily.com/releases/2013/09/130925130303.htm (accessed November 28, 2014).

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