Table 1

Effect of polycyclic hydrocarbons on the induction of liver tumors by 3′-methyl-4-dimethylaminoazobenzene

Rats were fed 0.054% 3′-methyl-4-dimethylaminoazobenzene in the presence and absence of polycyclic hydrocarbons (0.123 millimoles/kg of diet). (Taken from Ref. 4 .)

ExperimentTreatment% of animals with liver tumors at 3 months
1Control75
3-Methylcholanthrene0
Benzo(a)pyrene0
Dibenz(a,h)anthracene0
2Control50
3-Methylcholanthrene0
Benz(a)anthracene0
Pyrene38