Carcinogenicity studies with Deltamethrin in mice and rats
1990
Abstract The pesticide Deltamethrin, a synthetic pyrethroid, was studied for carcinogenicity in long-term experiments in mice and rats. Mice were given Deltamethrin by gavage in arachis oil at 0, 1, 4 or 8 mg/kg body wt for 2 years. A group of untreated controls was also available. Rats received 0, 3 or 6 mg/kg body wt. Deltamethrin in arachis oil for 2 years. In mice, an increased incidence of lymphomas was observed in the groups receiving 1 and 4 mg/kg body wt., but not in the group treated with 8 mg/kg body wt. Deltamethrin. In rats, an increased incidence of thyroid tumours was noted, but, no clear dose-response relation-ship was shown. Deltamethrin does not appear to be carcinogenic in mice or rats, but further tudies are needed on the group of compounds to which this substance belongs.
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