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New test identifies aggressive and less aggressive prostate cancers

MINNEAPOLIS / ST. PAUL--A simple test can be used to identify patients with the most aggressive prostate cancers, even among patients whose tumors are at the same stage, according to research at the University of Minnesota. The degree to which prostate cancers have progressed is determined by the Gleason grading system, which is based on the shape and microscopic appearance of tumors. Patients with higher grades of tumor are in more advanced stages of the disease, but the grade does not tell how aggressively the tumors have been growing or metastasizing. The new test was developed by cancer researcher Akhouri Sinha, a professor of genetics, cell biology, and development, faculty member of the University of Minnesota Cancer Center and research scientist at the Minneapolis Veterans Affairs Medical Center, and his colleagues. The work will be published in the June 15 issue of Cancer. Donald Gleason, who developed the Gleason grading system, is a co-author.

After skin cancer, prostate cancer is the most common form of cancer in U.S. men, according to National Cancer Institute statistics. More than a quarter of men diagnosed with cancer have prostate cancer. The disease strikes black men more often than white; Asian and American Indian men are affected less often. The Gleason grading system assigns tumors a score between two and 10, with 10 being the most advanced cancer. Patients with a Gleason score from seven to 10 have a higher risk of dying of prostate cancer than those with lower scores, but some patients with higher scores outlive some with lower scores.

"This means that within any score, there are biologically aggressive and less aggressive forms of cancer," said Sinha. "This makes it more difficult to predict outcomes for individual patients."

In order to invade surrounding tissue and escape to blood vessels, cancer cells produce high levels of an enzyme called cathepsin B (CB), which destroys proteins in the connective tissue that holds
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Contact: Deane Morrison
morri029@umn.edu
612-624-2346
University of Minnesota
11-Jun-2002


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