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A Critical Appraisal of the Value of the Mouse Cancer Bioassay in Safety Assessment
Carl L. Alden
Product Safety Assessment, SEARLE, Skokie, Illinois 60077
Peter F. Smith
Product Safety Assessment, SEARLE, Skokie, Illinois 60077
Charles E. Piper
Product Safety Assessment, SEARLE, Skokie, Illinois 60077
Leszek Brej
Product Safety Assessment, SEARLE, Skokie, Illinois 60077
Substantial progress in understanding nongenotoxic or secondary mechanisms of tumorigenesis has been made over the past decade. However, the methods used in regulated studies for assessment of carcinogenic potential in chemicals in development have not evolved significantly. Based on the experience of over 30 yr of testing and the societal need to control costs, reevaluation of standard cancer rodent bioassay protocols is being done. Expert consensus after evaluating the results of full-scale rodent bioassays of both sexes in 2 species is that a reduced protocol is acceptable. After review of relevant data, it is our opinion that cancer hazard assessment in male and female rats only would be sufficient and that, in the future, mouse bioassays will not add significant value on a routine basis. We are unable to find an example of a mouse tumorigenic finding that predicts a confirmed or probable human response with negative findings in a rat bioassay. The savings realized by eliminating mouse testing from routine protocols would be substantial and better spent in expanding short-term studies to add to our understanding of chemical carcinogenesis.
Toxicologic Pathology, Vol. 24, No. 6,
722-725 (1996)
DOI: 10.1177/019262339602400610
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