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Related Experiment Videos

Breast cancer mammography patterns

R L Egan, R C Mosteller

    Cancer
    |November 1, 1977
    PubMed
    Summary

    Dense fibroglandular tissue in mammography can delay breast cancer detection. This apparent increased risk is due to delayed diagnosis, highlighting the need for longer follow-up periods.

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    Area of Science:

    • Radiology
    • Oncology
    • Medical Imaging

    Background:

    • Mammography screening is crucial for early breast cancer detection.
    • Breast density, characterized by fibroglandular tissue, can impact mammogram interpretation.
    • Previous studies have explored the relationship between breast density and cancer detection rates.

    Purpose of the Study:

    • To prospectively categorize mammography findings based on fibroglandular tissue density.
    • To assess the influence of breast density on breast cancer detection rates and risk.
    • To determine the optimal follow-up duration for mammography studies in relation to breast cancer development.

    Main Methods:

    • Analysis of mammography studies from 1963-1972 involving 5,918 women over 30.
    • Prospective categorization of breasts into four classes based on increasing fibroglandular tissue.
    • Tracking of breast cancer incidence in relation to breast density categories and time intervals.

    Main Results:

    • Approximately 60% of cancers occurred in breasts with lower density (classes 1 and 2).
    • Dense breasts (classes 3 and 4) showed a delay in cancer detection, with more cancers found in class 4 over time.
    • Cancers detected between 38-88 months showed similar incidence rates across density categories, suggesting delayed diagnosis in denser breasts.

    Conclusions:

    • Dense fibroglandular tissue on mammography can significantly delay the detection of breast cancer.
    • The apparent increased risk in dense breasts is attributed to diagnostic delays rather than a true higher incidence.
    • A follow-up period exceeding three years is necessary to accurately assess the life history and detection patterns of breast cancer by mammography.

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