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Cancer epidemiology in Japan has been led by the large-scale population based cohort studies. Permanent registration system has made follow-up easier and more efficient. Low cancer incidence and mortality rates led the researchers to investigate possible preventive factors in diet and life style, in addition to the study of risk factors. The on-going large sized prospective cohorts should be a fruitful resource for future cancer epidemiological studies. Various studies of cancer epidemiology are introduced from a methodological aspect. cancer Epidemiology, cancer Registry, Cohort study, Mass-screening, cancer prevantion J Epidemiol, 1996 ; 6 : S19-S29.
Watanabe et al. (Mon,) studied this question.
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