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Case-control study on histologically determined multiple primary lung cancer.

H Sugimura, S Watanabe, S Tsugane

    Journal of the National Cancer Institute
    |September 1, 1987
    PubMed
    Summary
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    Cigarette smoking significantly increases the risk of developing multiple primary lung cancer (MPLC), particularly squamous cell carcinoma and small-cell carcinoma. This risk is dose-dependent, correlating with the Brinkman index (BI) of smokers.

    Area of Science:

    • Oncology
    • Epidemiology
    • Pulmonology

    Background:

    • Multiple primary lung cancer (MPLC) presents a complex clinical challenge.
    • Understanding risk factors for MPLC is crucial for early detection and prevention.

    Purpose of the Study:

    • To investigate the relationship between smoking habits, family history, and the occurrence of MPLC.
    • To compare risk factors between MPLC and unicentric lung cancer (ULC) cases.

    Main Methods:

    • Retrospective hospital-based case-control study of 72 MPLC cases (1965-1985).
    • MPLC cases were matched with ULC controls based on age, sex, histology, and residence.
    • Data collected included smoking history (Brinkman index), family cancer history, and alcohol consumption.

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    Main Results:

    • MPLC was more prevalent in males (3.1%) than females (1.8%).
    • Squamous cell carcinomas were predominant in MPLC cases (65%), all smokers.
    • A positive correlation was found between the Brinkman index and MPLC incidence.
    • Family history of cancer was noted in 47% of MPLC cases versus 40% of controls.

    Conclusions:

    • Cigarette smoking is a confirmed significant risk factor for MPLC, especially for squamous cell and small-cell lung carcinomas.
    • The risk of MPLC increases with the intensity of smoking, as indicated by the Brinkman index.
    • While not the primary focus, drinking habits and family history may also play a role in MPLC development.