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Prostate cancer is a serious health care problem in the United States. Whether or not to screen for it has become a timely issue. Although a large number of men have clinically important, asymptomatic, undetected prostate cancer, an even larger number have clinically unimportant cancer. To justify screening programs, not only must we avoid detecting biologically unimportant cancers, we must also detect and effectively treat that subset of tumors that, if undiagnosed, would progress, produce symptoms, and reduce life expectancy. Serum prostate-specific antigen (PSA) assay, or its variations such as PSA density, PSA velocity, and age-specific reference ranges, and the digital rectal examination are the best tests for detecting clinically important, asymptomatic, curable tumors. Recent data suggest that using serum PSA levels does not result in an overdetection of unimportant tumors. Highly effective, curative treatment of localized prostate cancer is available. These factors promote optimism that screening for prostate cancer will ultimately prove beneficial. Nonetheless, men should be informed regarding the benefits and possible risks before being screened for prostate cancer.