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The incidence of morphologically abnormal foetuses in the litters of cyclophosphamide (CP)-treated male mice was investigated and compared with control values. In two experiments (100 mg/kg) CP was shown to increase the incidence of grossly abnormal foetuses over that seen in the controls, although neither was statistically significant in isolation. When the probabilities from the two tests of significance were combined using the method of Fisher the result was significant (P = 0.02). These results suggest that an acute exposure to a mutagen in male mice can cause genetic damage that results in an increased incidence of phenotypically abnormal offspring. However, the large numbers of animals required and the variable control level of abnormalities, indicate that this dosing regimen is an inefficient method of studying the genetic mechanisms responsible for the effects seen.
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P C Jenkinson, and
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Food and cosmetics toxicology,
