Abstract
4-(Hydroxymethyl-benzenediazonium tetrafluoroborate was administered as a single intragastric instillation at 400 micrograms/g to Swiss albino mice. The treatment gave rise to glandular stomach tumours in incidences of 30% in females and 32% in males. Histopathologically, the tumours were classified as polypoid adenomas and adenocarcinomas. This diazonium ion is an ingredient of the cultivated mushroom of commerce, Agaricus bisporus. The implications are self-evident.
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