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Repeated dose (14 days), subchronic (13 wk) and chronic (2 yr) studies were carried out in succession to evaluate the toxic and carcinogenic effects of diglycidyl resorcinol ether (DGRE), a liquid spray epoxy resin, in F344/N rats and B6C3F1 mice. DGRE in corn oil was administered by gavage for 14 consecutive days in the repeated dose study and 5 days/wk in the subchronic and chronic studies. The mortality rate was increased in rats and mice in the repeated dose and subchronic studies. Hyperkeratosis, basal cell hyperplasia and squamous cell papillomas of the forestomach were observed in a few treated rats and mice in the subchronic study. Based on the results of the subchronic study, F344/N rats and B6CF1 mice (50 males and 50 females/species/dose) were administered DGRE (rats--0, 12, 25 and 50 mg/kg body weight, mice--0, 50 and 100 mg/kg body weight) in corn oil by gavage 5 days/wk for 103 wk. The incidence of neoplastic and non-neoplastic changes of the forestomach was increased in rats and mice in the chronic study. Under the conditions of the study, DGRE is considered to be carcinogenic to F344/N rats and B6C3F1 mice.
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