Statistical analysis of data in mutagenicity assays: rodent micronucleus assay.

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Statistical analysis of data in mutagenicity assays: rodent micronucleus assay.

To evaluate chemical safety, many kinds of short-term mutagenicity assays are performed together with long-term assays in animals. Rationales and methodology for these assays have been well discussed and documented. No statistical method, however, has been singled out as the method of choice for the evaluation of mutagenicity assay data, although a number of reports on statistical methods to ev...

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This report updates previous reviews that were conducted as part of the third and fourth International Workshops on Genetic Toxicology Testing of micronucleus (MN) assays in rodent tissues other than bone marrow. Tissues discussed here are liver, lung, skin, colon, spleen, testes and foetal/neonatal tissues with transplacental exposure. Previous reviews have been updated to include literature p...

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Biostatistical analysis of the micronucleus mutagenicity assay based on the assumption of a mixing distribution.

The in vivo micronucleus assay can be analyzed by comparing the number of micronuclei (MN) of several dose groups with those of a control group. In several publications, difficulties arose in estimating a suitable distribution for MN, even in the untreated historical control groups. Mitchell et al. described the presence of a subpopulation of more susceptible responders. Based on this assumptio...

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The Ames assay has received widespread attention from statisticians because of its popularity and importance to risk assessment. However, investigators have yet to routinely apply modern regression methods that have been available for more than a decade. We study yet another approach, the application of nonparametric regression techniques, not as the ultimate solution but rather as a framework ...

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ژورنال

عنوان ژورنال: Environmental Health Perspectives

سال: 1994

ISSN: 0091-6765,1552-9924

DOI: 10.1289/ehp.94102s149