Inbred female rats of the NZR/Gd strain were exceptionally susceptible to nitrosomethylurea (NMU) toxicity after intravesical instillations. After only 1.0 mg NMU total given in 10 fractions, 100% of NZR rats developed malignant bladder tumours. Transitional cell carcinomas predominated (56%) when the NMU dose interval was 2 weeks, and most tumours were squamous carcinomas (57%) with a 1-week interval.

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http://dx.doi.org/10.1016/0304-3835(84)90118-6DOI Listing

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