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A histological study of the promotive effect of diethylstilbestrol on diethylnitrosamine initiated carcinogenesis of liver in rat.

A single dose (80 mg/kg) of diethylnitrosamine (DEN) was given orally to castrated female Wistar rats. One week after that one half of the animals were treated with diethylstilbestrol (DES) 3 mg/kg/once a week subcutaneously. The other half of the animals received no any hormone or hormone derivatives. The change of the liver cells in animals treated with DEN alone failed to progress beyond the stage of hepatocellular alterations in foci or neoplastic nodules within 8 months, while most of those animals which received DES treatment after DEN initiation developed hepatocellular carcinomas after 6 months. This result denotes that the DES exerts a definite promotive effect on DEN initiated liver cell carcinogenesis.