PSA Value 2 Years Post-Radiation Predicts Long-Term Survival in Prostate Cancer Patients
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PSA Value 2 Years Post-Radiation Predicts Long-Term Survival in Prostate Cancer Patients

FAIRFAX, Va -- December 3, 2009 -- Patients with prostate cancer and a prostate-specific antigen (PSA) value of <=1.5 at 2 years after external beam radiation therapy (EBRT) are less likely to have a cancer recurrence and cancer-related death, according to a study published in the December 1 issue of the International Journal of Radiation Oncology*Biology*Physics, the official journal of the American Society for Radiation Oncology (ASTRO).

After a successful course of EBRT, PSA levels should decline gradually over the following 18 to 24 months. A continued rise in PSA can indicate relapsing disease.

Prior studies have attempted to categorise PSA response patterns after treatment to identify patients with an increased likelihood of relapsing earlier; however, most did not use a fixed point after treatment to predict outcomes.

Researchers at the Memorial Sloan-Kettering Cancer Center, New York, New York, sought to determine the significance of a patient’s reaching a certain PSA level at a specific point in time after EBRT.

The study authors found that patients with a PSA value of <=1.5 at 2 years had a 2.4% incidence of distant metastases at 5 years after treatment and a 7.9% incidence at 10 years. Patients with a PSA value >1.5 experienced a significantly higher rate of metastases at 5 and 10 years after treatment (10% and 17.5%, respectively).

“In the past, patients with a relapsing cancer after receiving radiation were not identified until several years after treatment, and at that point it may be too late to effectively salvage their recurrence,” said Michael Zelefsky, MD, lead author of the study, Memorial Sloan-Kettering Cancer Center, New York, New York. “If we can catch these future instances of cancer recurrence earlier in prostate cancer patients, then we have a much higher chance of reducing the mortality associated with the cancer.”

SOURCE: International Journal of Radiation Oncology*Biology*Physics

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