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The standard carcinogenicity bioassay, which involves treating two rodent species for a minimum of 2 years, at a range of doses, is acknowledged to be an insensitive tool because of the background `noise' of spontaneous disease. Most strains of rat used in such studies have high incidence of pituitary and mammary tumours; some inbred rat strains frequently develop leukaemia or testicular tumours; mice strains show high incidence of malignant lymphomas and liver tumours.

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