Johns Hopkins Gazette | January 5, 2009
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The newspaper of The Johns Hopkins University January 5, 2009 | Vol. 38 No. 16
 
Why Prostate Cancer Patients Fail Hormone Deprivation Therapy

By Christen Brownlee
Johns Hopkins Medicine

The hormone deprivation therapy that prostate cancer patients often take gives them only a temporary fix, with tumors usually regaining their hold within a couple of years. Now, researchers at Johns Hopkins have discovered critical differences in the hormone receptors on prostate cancer cells in patients who no longer respond to this therapy. The findings, reported in the Jan. 1 issue of Cancer Research, could lead to a way to track disease progression, as well as to new targets to fight prostate cancer.

Prostate cancer cells rely on androgens, male hormones that include testosterone, to survive and grow. Since 1941, doctors have taken advantage of this dependency to battle prostate cancer by depriving patients of androgens, either by castration or chemical methods. For most patients, this hormone deprivation therapy causes tumors to shrink, sometimes dramatically. However, it's never a cure; tumors eventually regrow into a stronger form, becoming resistant to this and other forms of treatment.

Seeking the reason why this therapy eventually fails, Jun Luo, an assistant professor at Johns Hopkins' James Buchanan Brady Urological Institute, and his colleagues at the Johns Hopkins University School of Medicine and the University of Washington and Puget Sound VA Medical Center looked to a key player: the androgen receptors on prostate cancer cells.

Using a large database, the researchers searched for variations of the nucleic acid RNA that prostate cells use to create androgen receptors, eventually identifying seven RNA sequences different from the "normal" androgen receptor already known to scientists. When they looked for these sequences in cells isolated from 124 prostate cancer patients, they found overproduction of these outlaw variants in prostate cancer cells taken from patients whose disease had become resistant to hormone deprivation therapy. One variation, AR-V7, was also prevalent in a select group of patients who had never taken hormone therapy but whose cancer aggressively regrew after surgery to remove their tumors.

To see how androgen receptors made from AR-V7 differ from others, the researchers forced lab-grown prostate cancer cells to produce only the AR-V7 sequence. Unlike cells with other androgen receptors, those with only AR-V7 receptors acted as if they were continually receiving androgens — turning on at least 20 genes that rely on androgens for activation — even though no androgens were present.

The results suggest that hormone therapy might encourage prostate cancer cells to overproduce the AR-V7 receptors over time, leading them to survive and grow aggressively even without androgens, Luo said. In some patients, he added, AR-V7 receptors might already be prevalent even without hormone therapy, predisposing them to an already aggressive form of prostate cancer that won't respond as well to hormone deprivation therapy.

"We may eventually be able to develop an assay to test for this androgen receptor variant, giving us a way to test which patients are good candidates for hormone deprivation therapy and providing a way to monitor disease progression in patients already on this therapy," Luo said.

Examining the differences between AR-V7 and other androgen receptor variants may also provide researchers with new ideas to develop prostate cancer-fighting pharmaceuticals, he said.

Other researchers who contributed to this study are Rong Hu, Thomas A. Dunn, Shuanzeng Wei, Sumit Isharwal, Robert W. Veltri, Elizabeth Humphreys, Misop Han, Alan W. Partin, William B. Isaacs and G. Steven Bova, all of the Johns Hopkins University School of Medicine; and Robert L. Vessella, of the University of Washington and Puget Sound VA Medical Center.

This research was funded by a grant from the David H. Koch Foundation.

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