Screening is regarded as a cost-effective and clinically useful approach for the early diagnosis of several malignancies, especially such common cancers as those of the breast and the cervix. This 1991 is a publication from the Project on evaluation of Screening for Cancer, organized by the International Union Against Cancer (UICC), one of the world's foremost agencies in the field of cancer epidemiology and control. It contains recommendations from the international authorities on cancers for which screening is used. Findings from studies in many countries are presented and evaluated, and methodological issues are also discussed. This is an influential and authoritative statement on the scope of cancer screening. It will be of interest to oncologists, epidemiologists and others in the public health field.