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Species differences in nitrosamine carcinogenesis.

W Lijinsky

    Journal of Cancer Research and Clinical Oncology
    |January 1, 1984
    PubMed
    Summary
    This summary is machine-generated.

    This study compared the cancer-causing effects of N-nitroso compounds in rats and hamsters. Tumor development varied by species and compound, with the 2-hydroxypropyl group linked to hamster pancreas tumors.

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    Area of Science:

    • Toxicology
    • Carcinogenesis
    • Comparative Oncology

    Background:

    • N-nitroso compounds are a class of chemicals known for their carcinogenic potential.
    • Understanding species-specific responses to carcinogens is crucial for risk assessment.

    Purpose of the Study:

    • To compare the carcinogenic activity of approximately 50 N-nitroso compounds, nitrosamines, and nitrosoalkylamides in rats and Syrian golden hamsters.
    • To investigate the influence of chemical structure on tumor induction sites and relative potency across species.

    Main Methods:

    • Administration of N-nitroso compounds via oral gavage (PO) to rats and hamsters at comparable dose rates.
    • Assessment of carcinogenic potency primarily based on the time to tumor-induced death.
    • Histopathological examination of tumor sites.

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    Main Results:

    • Tumor induction sites differed significantly between rats and hamsters; rats commonly developed esophageal and upper gastrointestinal tumors, while hamsters rarely showed esophageal tumors but developed forestomach tumors.
    • No definitive conclusion on the overall relative susceptibility of rats versus hamsters to these compounds was reached, as responses varied.
    • The 2-hydroxypropyl group appeared to be a key structural feature for inducing pancreatic tumors in hamsters.

    Conclusions:

    • Species-specific differences in susceptibility and tumor-site predilection exist for N-nitroso compounds.
    • Generalizations about the carcinogenic potency of N-nitroso compounds across species are limited.
    • Specific structural elements, like the 2-hydroxypropyl group, can influence target organ specificity in carcinogenesis.