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New Guidelines for Prostate Cancer Screening

American Cancer Society Says Men Need to Weigh Benefits and Limits of PSA Tests
By
WebMD Health News
Reviewed by Louise Chang, MD

March. 4, 2010 -- The American Cancer Society says men should talk to their doctors about the benefits and limitations of prostate cancer screening before deciding whether to be tested.

The group's newly revised guidelines make it clear that prostate specific antigen (PSA) blood testing should not occur unless this discussion happens.

The American Cancer Society stopped recommending routine PSA screening more than a decade ago, but the new recommendations are unequivocal in calling for all patients to be informed about the benefits and risks of PSA testing before screening takes place.

"There is a lot of uncertainty with prostate cancer screening," American Cancer Society Director for Prostate and Colorectal Cancers Durado Brooks, MD, MPH, tells WebMD. "Right now it is not entirely clear that finding a man's prostate cancer early will save his life."

Two studies reported early last year heightened long-standing concerns that the risks of routine prostate cancer screening may outweigh the benefits.

Benefits and Limits of PSA Tests

A large trial supported by the National Cancer Institute failed to show a reduction in prostate cancer deaths associated with PSA screening over an average of seven years of follow-up.

Another study from Europe found that routine screening reduced the rate of prostate cancer death by 20%.

But researchers also estimated that 1,400 men would have to be screened and close to 50 men whose cancers were detected through screening would have to be treated to prevent a single cancer death.

Fred Hutchinson Cancer Center biostatistician Ruth Etzioni, PhD, who co-wrote the revised American Cancer Society guidelines, says it isn't that simple.

"The risk-benefit ratio for screening is very different for a man in his 50s and a man in his 70s," she says.

According to Etzioni's own research, one in four men whose prostate cancer is detected through PSA screening actually has clinically irrelevant, slow-growing cancer that would never cause symptoms.

And one in four men will die of their cancer, she says.

Before routine screening, she says about 9% of men received a diagnosis of prostate cancer during their lifetimes and about 3% of men died of the disease.

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