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Related Experiment Videos

Heredity and human cancer.

A G Knudson

    The American Journal of Pathology
    |October 1, 1974
    PubMed
    Summary
    This summary is machine-generated.

    Cancer development typically requires two mutation steps. Dominant inherited mutations increase tumor susceptibility, but a second mutation is crucial for tumor initiation.

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    Inverse radiation dose-rate effects on somatic and germ-line mutations and DNA damage rates.

    Proceedings of the National Academy of Sciences of the United States of America·2000

    Area of Science:

    • Oncology
    • Genetics
    • Molecular Biology

    Background:

    • Dominantly inherited tumors in humans indicate that mutations are a key step in carcinogenesis.
    • Nonhereditary tumors may arise from similar mutations in somatic cells.
    • A single mutation is insufficient for tumor formation, suggesting a multi-step process.

    Purpose of the Study:

    • To investigate the role of multiple mutations in tumor initiation.
    • To understand the genetic basis of inherited and nonhereditary cancers.
    • To explore factors influencing cancer susceptibility and onset.

    Main Methods:

    • Analysis of genetic mutations in inherited and nonhereditary tumors.
    • Examination of the carcinogenic pathway involving mutational steps.

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  • Review of evidence supporting a two-step mutation model for tumor initiation.

    • Main Results:

    • A second mutational step is necessary for tumor initiation.
    • Germinal mutations confer high susceptibility to specific tumors.
    • Individuals with dominant mutations may develop multiple tumors at an earlier age.

    Conclusions:

    • Tumorigenesis involves at least two distinct mutational events.
    • Dominant cancer genes significantly increase cancer risk and alter onset.
    • Interactions between genetic susceptibility, environmental factors, and dominant mutations influence cancer probability.