Hypophysectomy effectively inhibited the formation of liver damage and hepatomas in rats fed diets containing 0.06 per cent 3′-methyl-4-dimethylaminoazobenzene up to periods of 19 weeks. In other experiments a 10–12-week period of feeding has usually been sufficient to induce a high percentage of tumors in intact animals.

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This investigation was supported by a research grant from the Dernham Trust Fund, California Division, American Cancer Society.

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