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New genetic variant associated with prostate cancer in African-Americans
Date:10/31/2007

Two tiny genetic variations may provide the best clues yet for finding more precise ways to estimate prostate cancer risk and improve screening and early detection for men of African descent, report researchers from the University of Chicago and the Translational Genomics Research Institute, Phoenix, AZ, in the December 2007 issue of Genome Research, published early online.

The researchers set out to determine whether results from four previous studies that linked genetic variations on one region of chromosome 8 to increased prostate cancer risk among Caucasians were also valid for men of African heritage. In the process, however, they found an additional genetic variation among African American men that was an even stronger marker for cancer risk for these men. That variation is located within a gene that plays a role in DNA repair. A malfunction in DNA repair could contribute to cancer development.

"This finding emphasizes the importance of ancestry in studying genetics," said study author Rick Kittles, associate professor of medicine at the University of Chicago Medical Center. "Previous studies led us to one specific region of chromosome 8," he said. "Then this approach -- which took advantage of genetic differences among African American men, who are at very high risk for this type of cancer -- led us to a different locus within that region and directly to a gene of interest.

Prostate cancer is the most common male malignancy and the second leading cause of cancer death in men. According to the American Cancer Society, it will affect nearly 220,000 men in the United States in 2007 and claim the lives of more than 27,000. It disproportionately affects African Americans who "exhibit the highest rate worldwide," Kittles said.

In this study, research groups lead by Kittles and by John Carpten of the Translational Genomics Research Institute analyzed the region of chromosome 8 highlighted by the earlier studies done on
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Contact: John Easton
john.easton@uchospitals.edu
773-702-6241
University of Chicago Medical Center
Source:Eurekalert

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