Relationships between carcinogenicity, mutagenicity, and theoretical reactivity indices for polycyclic aromatic hydrocarbons
Abstract
Statistical correlations have been examined between two experimental carcinogenicity indices, a mutagenicity index, and several theoretical reactivity indices for a sample of polycyclic aromatic hydrocarbons displaying a considerable range of carcinogenic activities. Salmonella/microsome mutagenicity assay results show no quantitative correlation with either lball indices (r = 0.08) or a mouse-skin tumor index (r = −0.11) for this sample, whereas the two carcinogenicity indices show reasonable agreement (r = 0.84). The theoretical indices, which represent chemical reactivities for several putative carcinogenic “activation” steps, correlate with the cancer indices ( r ∼ 0.6–0.9). but not the mutagenicity index, suggesting a usefulness in cancer prescreening procedures. Similar results are found for a sample of 24 unsubstituted aromatic hydrocarbons. Available hamster V79 cell assay results show good correlations with the carcinogenicity indices (r = 0.87–0.99).