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Related Experiment Videos

The pathogenesis of bladder cancer

G H Friedell, J B Jacobs, G K Nagy

    The American Journal of Pathology
    |November 1, 1977
    PubMed
    Summary

    Carcinoma in situ may precede invasive bladder cancer, originating from atypical epithelial proliferation. Pleomorphic microvilli on bladder epithelial cells indicate irreversible lesions in a rat model.

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    Area of Science:

    • Urologic Oncology
    • Cell Biology
    • Carcinogenesis

    Background:

    • Bladder cancer development may involve carcinoma in situ within atypical epithelial fields.
    • The relationship between noninvasive flat and papillary bladder tumors remains unclear.
    • Preneoplastic bladder lesions are considered irreversible.

    Purpose of the Study:

    • To investigate the relationship between invasive and in situ bladder cancer.
    • To characterize preneoplastic bladder lesions using an animal model.
    • To identify cellular markers associated with irreversible bladder lesions.

    Main Methods:

    • Development of an experimental animal model for bladder cancer.
    • Induction of hyperplastic lesions in Fischer rats using N-[4-(5-nitro-2-furyl)-2-thiazolyl] formamide (FANFT).
    • Scanning electron microscopy of cytologic and histologic bladder preparations.

    Main Results:

    • A spatial and temporal relationship exists between invasive and in situ bladder cancer.
    • Pleomorphic microvilli were observed on the luminal surface of urinary bladder epithelial cells in rats.
    • The appearance of pleomorphic microvilli correlated with irreversible hyperplastic epithelial lesions.

    Conclusions:

    • Carcinoma in situ may arise from atypical epithelial proliferation, preceding invasive bladder cancer.
    • Pleomorphic microvilli serve as a potential indicator of irreversible preneoplastic changes in the bladder.
    • The developed animal model facilitates the study of bladder cancer progression and irreversibility.

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