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Related Experiment Videos

Multiple cancer--an epidemiologic exercise in Finland.

L Teppo, E Pukkala, E Saxén

    Journal of the National Cancer Institute
    |August 1, 1985
    PubMed
    Summary

    This study analyzed multiple cancer occurrences in Finland, finding associations between cancers with similar causes, like smoking-related lung and larynx cancers. It also noted increased risks for some cancers based on prior diagnoses and patient demographics.

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    Area of Science:

    • Epidemiology
    • Oncology
    • Public Health

    Background:

    • Understanding the occurrence of multiple primary cancers is crucial for cancer prevention and treatment.
    • Previous research suggests shared risk factors and etiological pathways may link different cancer types.
    • The Finnish Cancer Registry provides a robust dataset for investigating cancer patterns.

    Purpose of the Study:

    • To investigate the occurrence and patterns of multiple primary cancers using a large population-based registry.
    • To identify associations between specific cancer types and explore potential shared risk factors.
    • To analyze how age at diagnosis and follow-up duration influence the risk of subsequent cancers.

    Main Methods:

    • Analysis of data from the Finnish Cancer Registry (1953-1979) including 279,745 cancer patients.
    • Identification of 5,871 new primary cancers occurring after the first diagnosis.
    • Statistical analysis to assess relative risks and associations between different cancer types, considering factors like age and follow-up time.

    Main Results:

    • Positive associations observed between cancers with similar etiologies (e.g., lip, larynx, lung cancers due to smoking; breast and endometrial cancers due to hormonal factors).
    • Clustering of risk factors led to excess risks (e.g., colon cancer in female breast cancer patients) and deficits (e.g., lung cancer in male colon cancer patients).
    • Increased risk of leukemia noted in patients with breast, endometrial, and thyroid cancers; elevated salivary gland cancer risk in patients with non-melanoma/basal cell skin cancers.

    Conclusions:

    • Shared risk factors and etiological pathways significantly influence the occurrence of multiple primary cancers.
    • Cancer risk patterns are influenced by demographic factors such as age at diagnosis and potentially by social class and irradiation.
    • These findings highlight the importance of considering a patient's full cancer history and potential shared risk factors in clinical practice and research.

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