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Prostate cancer incidence trends reveal extent of screening-related overdiagnosis

A new look at the recent surge in prostate cancer incidence suggests that 29% of cases in white men and 44% of cases in black men that are detected by prostate-specific antigen (PSA) testing, may represent overdiagnosis, or the detection of cancers that otherwise would not have been detected within the patient's lifetime. These findings appear in the July 3 issue of the Journal of the National Cancer Institute.

"This information is of great importance because considerable morbidity can be associated with treatment for the disease," says Ruth Etzioni, Ph.D., of the Fred Hutchinson Cancer Research Center in Seattle, and her colleagues.

The U.S. Food and Drug Administration approved PSA testing in 1986 as a way to monitor prostate cancer progression. Use of the test for prostate cancer screening caught on and increased dramatically beginning in 1988, despite little evidence to support a benefit in prostate cancer mortality reduction.

Concurrently, prostate cancer incidence increased sharply and had more than doubled by 1992 before going back down. This apparent surge in incidence prompted concern over prostate cancer overdiagnosis.

To estimate the extent of prostate cancer overdiagnosis that would have resulted in the incidence patterns observed from 1988 through 1998, Etzioni and her colleagues compared cancer registry data on observed prostate cancer incidence with a computer-based projection of the increase in incidence of prostate cancer that would have been expected in the absence of PSA testing. The computer model was based on a hypothetical cohort of 2 million men between the ages of 60 and 84.

The authors found that among men who were 60 to 84 years old in 1988, the estimated rate of overdiagnosis as a result of PSA screening was approximately 29% for white men and 44% for black men. These rates were consistent with the observed prostate cancer incidence for this age group from 1988 to 1998.

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Contact: Linda Wang
jncimedia@oupjournals.org
301-841-1287
Journal of the National Cancer Institute
2-Jul-2002


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