by our system , chemicals were classified into 4 main groups , namely , ( i ) hepatocarcinogens which have both initiating and enhancing activity , ( ii ) non-hepatocarcinogens with initiating activity only , ( iii ) promoters of hepatocarcinogenesis which have promoting activity and ( iv ) non-carcinogens and non liver promoters which did not initiate nor promote nodule development .
C1512409
hepatocarcinogenesis
C0023884
liver