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The carcinogenic activity of Panfuran-S containing 3-di-(hydroxymethyl-)amino-6-(5-nitro-2-furylethenyl-)1,2,4-triazine (DHNT) orally administered to mice for 35 weeks was studied. DHNT produced malignant tumors of the forestomach in the highest incidence and also, in decreasing order of frequency, of the duodenum and/or jejunum, esophagus and urinary bladder. Forestomach squamous cell carcinomas were produced dose-dependently in mice receiving more than 350 ppm DHNT and rose to 100% in mice receiving 3,500 ppm. The incidence of duodenal and/or jejunal adenocarcinomas were 8 of 28 mice (29%) receiving 1,750 ppm and 10 of 17 mice (59%) receiving 3,500 ppm. The incidence of esophageal squamous cell carcinoma was 3 of 11 mice (11%) receiving 1,750 ppm and that of urinary bladder transitional cell carcinoma was 2 of 28 mice (7%) receiving 1,750 ppm and 1 of 17 mice (6%) receiving 3,500 ppm DHNT.
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