American Journal of Epidemiology Vol. 148, No. 8: 775-785
Copyright © 1998 by The Johns Hopkins University School of Hygiene and Public Health
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Asymptomatic Incidence and Duration of Prostate Cancer
1Fred Hutchinson Cancer Research Center Seattle, WA
2National Cancer Institute Bethesda, MD
Reprint requests to Dr. Ruth Etzioni, Fred Hutchinson Cancer Research Center, Program in Biostatistics, 1100 Fairview Avenue N, MPE-665, P. O. Box 19024, Seattle, WA 98109-1024.
Prostate cancer is known as a disease with an extremely high prevalence relative to its clinical incidence in the population. The combination of preclinical incidence and duration that could yield this phenomenon is of tremendous interest to researchers trying to understand the natural history of the disease and to develop efficient screening strategies. In this article, the authors present estimates of the age-specific asymptomatic incidence and average preclinical duration of prostate cancer. The methodological approach is to first estimate the age-specific incidence of new (stage Al) prostate cancers using preclinical prevalence data from autopsy studies performed between 1941 and 1964 and clinical incidence data for the years 19601986 from the Surveillance, Epidemiology, and End Results (SEER) program of the National Cancer Institute. Then, the preclinical prevalence estimates are divided by the derived preclinical incidence estimates to yield estimates of the average duration of asymptomatic disease. The estimated mean duration among white men is between 11 and 12 years and appears to be approximately 1 year shorter for blacks than for whites. Comparison of the lifetime risks of preclinical and clinical disease suggests that approximately 75% of prostate cancers will never become diagnosed if clinical incidence remains at levels observed in 19841986, prior to the introduction of prostate-specific antigen (PSA) screening in the population. Am J Epidemiol 1998; 148: 77585.
disease progression; natural history; prevalence; prostatic neoplasms; SEER program
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