C‐cell adenomas of the thyroid were statistically significantly increased in low‐dose male rats, C‐cell carcinomas of the thyroid in males did not occur at a statistically significant incidence, adenomas and carcinomas combined were seen in male rats with a positive trend and the incidence was statistically significantly (1,000 mg/kg diet, 2,000 mg/kg diet) higher than in the controls, but did not demonstrate a dose–response relationship.
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