Promoting effects of intravesical instillation of saline on bladder lesion development in rats pretreated with N-butyl-N-(4-hydroxybutyl) nitrosamine are inhibited by bacillus Calmette-Guerin.
The promoting effects of intravesical instillation of saline and the efficacy of bacillus Calmette-Guerin (BCG) for prophylaxis of bladder carcinogenesis were assessed. Rats were given 0.05% N-butyl-N-(4-hydroxybutyl)nitrosamine (BBN) for 10 weeks; they were then given 6 weekly intravesical instillations of BCG, saline or distilled water starting 1 week or 15 weeks after the BBN treatment. At 32 weeks, both the incidences and numbers of bladder cancers were elevated in animals receiving the saline. An exception was the early phase BCG group. Significant increases in tumor size were also noted for the saline, but not the distilled water group. The results indicate that intravesical instillation of saline promotes urinary bladder carcinogenesis. However, the inhibitory influence of BCG was suggested if administered at the early, but not the late phase, of carcinogenesis.
Meijo Hospital and Department of Urology, Nagoya City University Medical School, Nagoya, Japan. hiko0512@lares.dti.ne.jp
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T
Okamura
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Akita
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K
Tozawa
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Ito
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Yamada
K
K
Kohri
D000818:Animals; D001500:BCG Vaccine / Q000008:administration & dosage / Q000627:therapeutic use*; D002085:Butylhydroxybutylnitrosamine; D002273:Carcinogens / Q000037:antagonists & inhibitors / Q000494:pharmacology*; D002294:Carcinoma, Squamous Cell / Q000139:chemically induced / Q000453:epidemiology / Q000378:metabolism / Q000517:prevention & control; D002295:Carcinoma, Transitional Cell / Q000139:chemically induced / Q000453:epidemiology / Q000378:metabolism / Q000517:prevention & control; D005260:Female; D006128:Growth / Q000187:drug effects; D007150:Immunohistochemistry; D015994:Incidence; D010212:Papilloma / Q000139:chemically induced / Q000453:epidemiology / Q000378:metabolism / Q000517:prevention & control; D018809:Proliferating Cell Nuclear Antigen / Q000378:metabolism; D051381:Rats; D011916:Rats, Inbred F344; D012965:Sodium Chloride / Q000037:antagonists & inhibitors / Q000494:pharmacology*; D013997:Time Factors; D001749:Urinary Bladder Neoplasms / Q000139:chemically induced / Q000453:epidemiology / Q000378:metabolism / Q000517:prevention & control*
D001500:BCG Vaccine; D002273:Carcinogens; D018809:Proliferating Cell Nuclear Antigen; D002085:Butylhydroxybutylnitrosamine; D012965:Sodium Chloride