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The effect of unilateral nephrectomy on the growth of bladder tumors was investigated in male F344 rats treated with 0.05% N-butyl-N-(4-hydroxybutyl)nitrosamine(BBN) for 6 weeks by means of macroscopical and microscopical examinations. Unilateral nephrectomy 4 weeks after the initiation of BBN administration significantly increased both the number and the volume of visible tumors per rat as compared with the sham-operated group. Histological examination also revealed that the numbers of papillonodular hyperplasia and cancer per basement membrane were significantly increased by unilateral nephrectomy. The results imply a growth-enhancing effect of unilateral nephrectomy on carcinogenesis of the rat bladder.
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