Professor Ito gennemgik undersøgelsen, som var blevet iværksat af den japanske regering, og som tyder på, at tilsætningen af BHA til foderet for Fischer F 344 rotter forårsagede hyperplasi, papillomer og pladeepitelkarcinomer i formaven hos rotter.
Professor Ito reviewed the study, which had been commissioned by the Japanese government, and which indicates that the addition of BHA to the diet of Fischer F 344 rats caused hyperplasia, papillomas and squamous call carcinomas of the forestomach of the rats.