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Cancer and aging.

V N Anisimov

    Archiv Fur Geschwulstforschung
    |January 1, 1985
    PubMed
    Summary

    Aging alters tissue sensitivity to carcinogens, increasing cancer risk. A model suggests cancer incidence rises due to cumulative environmental and age-related internal factors affecting DNA repair and cell growth.

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    Area of Science:

    • Oncology
    • Gerontology
    • Molecular Biology

    Background:

    • Carcinogen sensitivity varies across tissues and changes with age.
    • Age-related declines in DNA repair and altered proliferative activity influence cancer initiation.
    • Older age generally enhances the transplantability and growth of grafted tumors.

    Purpose of the Study:

    • To investigate how aging affects tissue sensitivity to various carcinogenic agents.
    • To propose a model explaining age-related increases in cancer incidence.
    • To identify key factors contributing to cancer development in aging organisms.

    Main Methods:

    • Experiments utilizing chemical, radiation, and hormonal carcinogenic agents.
    • Analysis of age-related changes in DNA repair systems and tissue proliferative activity.
    • Development of a theoretical model incorporating stochastic and non-stochastic factors in carcinogenesis.

    Main Results:

    • Tissue sensitivity to carcinogens changes unequally with age, influenced by agent type and intrinsic biological factors.
    • A model was proposed where cancer incidence results from combined stochastic (environmental) and non-stochastic (age-related internal) factors.
    • Non-stochastic factors include age-dependent changes in carcinogen metabolism, DNA repair, proliferation, immunity, and hormonal status.

    Conclusions:

    • Cancer prevention strategies should address both environmental carcinogen exposure and age-related biological changes that promote cancer.
    • Understanding tissue-specific age-related shifts is crucial for effective primary cancer prevention.
    • Inhibiting age-related factors that facilitate carcinogenesis is a key component of comprehensive cancer prevention.

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