Chronic toxicity studies of vinyl acetate in Fischer rats

A chronic toxicity test was carried out in groups of 20 male and female F344 rats with vinyl acetate dissolved in drinking water at two concentrations, 2500 and 1000 mg/liter. Treatment lasted for 2 years and did not lead to early death of the animals compared with untreated controls. The incidence of most types of neoplasm was similar in the treated and control groups. However, six females receiving the higher dose of vinyl acetate had adenoma or carcinoma of the thyroid and five had carcinoma of the uterus; the latter were not seen in the controls.