3.4. In vitro mammalian cell genotoxicity
Methyl methanesulfonate and benzo[a]pyrene as positive control
substances (data not shown) as well as the TPM of the reference
cigarette 2R4F produced mutagenicity results consistent
with historical data from the laboratory.
Genotoxicity results on a per cigarette basis are given in the
Appendix in Table C. There were no significant differences between
the genotoxicity of TPM from the test cigarettes containing either
Mix A, B or C when compared to that of the control cigarette.
On a per mg TPM basis, results for TPM of the test cigarettes
containing Mix A, B or C were very similar to those of the control
cigarette, for both low and high inclusions as well as with and
without metabolic activation. There were no cases of significant
differences from the control cigarette. Without metabolic activation,
mutagenicity data for the reference cigarette 2R4F were
approximately the same as for the experimental cigarettes. Values
with S9 were approximately two times lower for the reference cigarette
2R4F (Fig. 6).