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The effect of leupeptin on the induction of lymphoblastic leukemia in ICR/JCL female mice by N-nitrosobutylurea (NBU) was investigated. NBU was given as a 0.02% solution in drinking water for 10 weeks. A 0.1% concentration of leupeptin was given in the diet. Group A was fed on the leupeptin diet from the beginning, Group B received it after the end of NBU treatment, and Group C was fed on a leupeptin-free control diet throughout. The average periods in the appearance of leukemia in groups A, B, and C were 115+/-50, 112+/-43, and 100+/-17 days (mean+/-SD), respectively, and there was a significant difference between groups A and B and Group C at P less than 0.001. In regard to this point, leupeptin might have the effect of retarding the rpocess of leukemogenesis. However, leupeptin showed no effect on the incidence and histopathological finding of leukemia.
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