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Parity and breast cancer.

M Alderson

    British Medical Journal (Clinical Research Ed.)
    |July 4, 1981
    PubMed
    Summary

    Breast cancer diagnosis age varies by childbirth history. Nulliparous women were diagnosed at the oldest average age (65.9 years), while women with two children were diagnosed at the youngest average age (60.4 years).

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    Area of Science:

    • Epidemiology
    • Oncology
    • Demography

    Background:

    • Parity, the number of children born to a woman, is a known factor influencing breast cancer risk.
    • Understanding the relationship between parity and breast cancer diagnosis age is crucial for public health strategies.

    Purpose of the Study:

    • To estimate the mean age of breast cancer diagnosis across different parities in England and Wales.
    • To investigate potential associations between parity and the age at which breast cancer is diagnosed.

    Main Methods:

    • Utilized data from the 1961 and 1971 Censuses in England and Wales to determine women's age distribution by parity in 1976.
    • Applied age-specific breast cancer incidence rates for England and Wales in 1975 to estimate expected cases and mean diagnosis age per parity.

    Main Results:

    • The highest mean age at breast cancer diagnosis was observed in nulliparous women (65.9 years).
    • The lowest mean age at breast cancer diagnosis was found in women with two children (60.4 years).
    • Results were comparable to a separate study in Birmingham, though potential confounding by population age distribution was noted.

    Conclusions:

    • Parity appears to influence the average age of breast cancer diagnosis.
    • Nulliparous women tend to be diagnosed at older ages compared to women with two children.
    • Further research is needed to differentiate the direct effects of parity from population-level demographic factors.

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