Health / Medical Topics

    WF, Rat Strain

    In females tumors include 27% pituitary, 21% mammary, 3% adrenal, 9% leukemia (generalized), 7% lymphoma (malignant), 3% lipomas and 4% unclassified (Kim et al 1960). Mean life span 21 months in females and 23 months in males. Leukemia 15-22% characterised by an unusual type of mononuclear cell containing reddish granules. Incidence of spontaneous pituitary tumors 38% in rats older than 10 months of age, increasing to a maximum of 69% at 28-32 months of age. Higher incidence in females (71%) than in males (35%) (NCI Thesaurus)




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