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We attempted to establish an animal model for renal pelvic and ureteral carcinomas. In Experiment 1, Sprague-Dawley (SD)/cShi and SD/gShi strains of male and female rats and Fischer-344 (F-344) DuCrj and LEW/Crj strains of male rats, 6 wk old, were given 0.05% N-butyl- N-(4-hydroxybutyl)nitrosamine (BBN) for 12 wk and then treated without chemical for 10 wk. Only the SD/cShi strain. which has spontaneous hydronephrosis and hydroureter, showed high incidences of carcinomas in the renal pelvises and ureters, whereas the other strains did not. In Experiment 2, SD/cShi and Crj:CD strains of male and female rats. 6 wk old, were exposed to 0.05% BBN for 20 wk. Both sexes of SD/cShi rats had high incidences of bilateral carcinomas in renal pelvises and/or ureters associated with urinary bladder carcinomas, whereas both sexes of Crj:CD rats had urinary bladder tumors only. These results indicate that the SD/cShi strain may be a suitable animal for the induction of renal pelvic and ureteral carcinomas that appear to depend on urine stagnation secondary to hydronephrosis and hydroureter.

Induction of the Renal Peiyic and Ureteral Carcinomas by N-Butyl-N-(4-Hydroxybutyl)nitrosamine in SD/cShi Rats with Spontaneous Hydronephrosis