Incidence and spectrum of spontaneous neoplasms in Han: NMRI mice of both sexes

Two hundred Han: NMRI mice of both sexes were kept for their natural life-span to obtain information about the spontaneous tumour spectrum of this strain. Neoplasms were seen in 72 % of the males and 64 % of the females. Lung tumours, Harderian gland tumours, liver and adrenal gland neoplasms were common in males, while ovary tumours and lung tumours were the most frequent neoplasms in females.