This volume consists of the proceedings of a symposium held at Oxford concerning the weight to be given to negative epidemiolgoical evidence in identifying agents that are potentially carcinogenic to humans. A number of highly pertinent examples are studied, including carcinogens that have been identified experimentally but either have important roles in society (such as oral contraceptives) or are too expensive to remove from the environment (such as nitrate in drinking-water). The relative weight given to experimental and epidemiologic results is fully discussed, especially in terms of social and economic consequences. This is a trail-blazing volume of great importance to anyone interested in assessment of human risk.
