the histologic appearance and cytochemical characteristics of foci of hepatic cellular alteration , hepatic nodules , and hepatocellular carcinomas occurring in male sprague-dawley rats treated with the hypolipidemic agent clofibrate ( cas : 637-07-0 ) , with phenobarbital ( cas : 50-06-6 ) , or with diethylnitrosamine [ ( dena ) cas : 55-18-5 ] followed by phenobarbital were studied after treatment periods from 1 month to 2 years .
C0227525
hepatic
C2239176
hepatocellular carcinomas