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Prostate Cancer Screening Questioned

Government Panel Says Benefits Uncertain

WebMD Health News

Dec. 3, 2002 -- Men looking for a simple answer to their questions about prostate cancer screening will find little solace in the findings of a major government task force. After reviewing recent research on the issue, the group says there is not enough evidence to make a recommendation for or against routine prostate cancer screening.

Prostate cancer is the most common cancer among men and the second leading cause of cancer death among men, following lung cancer. According to the American Cancer Society (ACS), 189,000 men will be diagnosed with prostate cancer in the U.S. this year, and more than 30,000 men will die of the disease.

Death rates from prostate cancer have dropped since the use of prostate cancer screening tests, such as the PSA blood test and rectal exam, became common in the 1990s, according to the ACS. However, there is no direct evidence that this drop is a result of screening tests.

The results of the U.S. Preventive Services Task Force report appear in the Dec. 3 issue of the Annals of Internal Medicine.

Researchers say one of the biggest problems in evaluating the effectiveness of prostate cancer screening is that the severity of the tumors varies greatly, and the screening tests aren't very specific.

Many of these tumors grow very slowly and may not ever cause a problem for many of the men diagnosed with the disease. But current screening methods can only distinguish a small number of men with either the best or worst chances for survival. They aren't very good at making predictions about the survival chances for men who fall in the middle, which accounts for the vast majority of prostate cancer cases.

Although there are virtually no health risks associated with the screening tests themselves, experts say the risks associated with widespread prostate cancer screening lie in the uncertainties about the disease itself, how to interpret test results, and making treatment decisions.

Durado Brooks, MD, MPH, director of prostate cancer at ACS, says men need to understand that the PSA test, which measures the level of a protein produced by normal prostate cells as well as prostate cancer cells, still misses about 10% to 15% of cancers.

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