International Journal of Epidemiology, Vol 28, 403-408, Copyright © 1999 by International Epidemiological Association
PN Post, H Straatman, LA Kiemeney and JW Coebergh
BACKGROUND: Several lines of evidence suggest that, as a result of improved
diagnostic techniques, the increase in incidence of prostate cancer is due
largely to increased detection of subclinical cases. Between 1971 and 1989,
a considerable increase in incidence was found in Southeastern Netherlands
among men aged under 60 years without an improvement in prognosis. We
hypothesized that in addition to the increase due to increased detection, a
genuine increase in incidence has occurred in the last two decades and that
this should be reflected in national mortality rates. METHODS: Age-specific
and age-adjusted mortality rates were calculated to determine whether
mortality due to prostate cancer continued to increase after 1990. Using
log-linear Poisson modelling according to Clayton and Schifflers, we
estimated the contribution of period and cohort effects to prostate cancer
mortality between 1955 and 1994. RESULTS: The age-adjusted mortality
increased from 22 in 1955-1959 to 33 per 10(5) in 1990-1994 (European
standardized rate). For men under 65, the rates stabilized after 1989. The
age-cohort model fitted the data better than the age-period model.
Therefore, the increase in mortality can be explained largely by the
increasing risk for successive birth cohorts for men born until 1930.
However, more frequent reporting of prostate cancer as the underlying cause
of death (partly attributable to a decline in competing causes of death)
may have occurred as well. CONCLUSIONS: Our findings suggest an increased
risk of fatal prostate cancer in The Netherlands between 1955 and 1994.
ARTICLES
Increased risk of fatal prostate cancer may explain the rise in mortality in The Netherlands
Department of Epidemiology & Biostatistics, Erasmus University, Rotterdam, The Netherlands.
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