[Effect of sialadenectomy on hepatic carcinogenesis in rats induced by N-nitrosodiethylamine].

It is established that sialadenectomy leads to inhibition of hepatocarcinogenesis induced in adult rats by diethylnitrosamine, which is confirmed by a decrease in the incidence of tumours, their delayed growth and an increase of longevity. But sialadenectomy 2 weeks after the beginning of carcinogen treatment has no effect on the hepatocarcinogenesis. A significant molecular heterogeneity of the epidermal growth factor-competing activity is observed in acid-ethanol extracts of the liver tumour of the sialadenectomized rats.