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Prognostic markers for prostate cancer patients who receive radiation after surgery
Date:11/3/2010

SAN DIEGO, CA (November 3, 2010)Removal of the prostate gland often eradicates early-stage cancer. But patients whose cancer has spread may need to follow up with what is known as salvage radiation therapy. Researchers at Fox Chase have now determined a better way to monitor outcomes after this procedure.

A team led by Mark Buyyounouski, M.D., M.S., radiation oncologist at Fox Chase who will present the results at the annual meeting of the American Society for Radiation Oncology, found that levels of a prostate-specific protein up to 18 months after salvage radiation therapy predict mortality and progression of the disease.

"It's important because if you can identify people who are more likely to die of prostate cancer early, you can talk with them about doing another treatment very quickly, with the hope that it will prolong their lives," says Buyyounouski.

Prostate cancer, the most common cancer in men and the second leading cause of cancer deaths in men, causes nearly 220,000 new cases and more than 30,000 deaths each year. The presence of the disease is indicated by the amount of a protein called prostate-specific antigen (PSA). For men who do not undergo surgery, reaching a PSA level of 2 ng/mL within 18 months after radiation treatment is associated with spread of the disease and higher mortality rates. Buyyounouski and his team were curious about whether the same criterion is important for patients who receive radiation after surgery.

In the study, the scientists looked at 222 patients who went through salvage radiation therapy at Fox Chase between 1991 and 2007. They found that roughly half of the men who surpassed threshold PSA levels in the bloodstream within 18 months after treatment experienced spread of the disease or died within five years. By contrast, men whose PSA levels did not reach the threshold within 18 months did not die within five years, and the likelihood that the disease metastasized was only 17%
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Contact: Diana Quattrone
Diana.Quattrone@fccc.edu
215-728-7784
Fox Chase Cancer Center
Source:Eurekalert

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