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  1. Home
  2. Investigating The Relationship Between Birthweight And Breast Cancer From A Non-linear And Mediation Perspective.
  1. Home
  2. Investigating The Relationship Between Birthweight And Breast Cancer From A Non-linear And Mediation Perspective.

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Investigating the Relationship between Birthweight and Breast Cancer from A Non-Linear and Mediation Perspective.

Meng Zhang1, Jiahao Qiao1, Ping Zeng1,2,3,4,5

  • 1Department of Biostatistics, School of Public Health, Xuzhou Medical University, Xuzhou, Jiangsu, 221004, China.

Iranian Journal of Public Health
|May 2, 2024

View abstract on PubMed

Summary
This summary is machine-generated.

Birthweight influences breast cancer risk through indirect pathways like age of menarche and menopause. A non-linear association was found, particularly strong in premenopausal women, highlighting complex birthweight-breast cancer links.

Keywords:
BirthweightBreast cancerMediation analysisNon-linear associationUK Biobank

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Area of Science:

  • Reproductive Epidemiology
  • Oncology
  • Human Genetics

Background:

  • Previous epidemiological studies suggest a link between birthweight and breast cancer risk, but findings are inconsistent.
  • This research re-examines the birthweight-breast cancer association using a large UK Biobank cohort.

Purpose of the Study:

  • To investigate the causal mediation between birthweight and breast cancer, considering age of menarche and menopause as mediators.
  • To explore potential non-linear relationships between birthweight and breast cancer risk.
  • To analyze the association stratified by menopausal status.

Main Methods:

  • Utilized UK Biobank data from 5,760 breast cancer cases and 162,778 controls (white British volunteers, 2006-2010).
  • Employed traditional mediation analysis to assess indirect effects via menarche and menopause.
  • Investigated non-linear associations by including the square of birthweight and birthweight categories.
  • Conducted stratification analysis based on menopausal status.
  • Main Results:

    • Birthweight indirectly affects adult breast cancer risk through age at menarche and menopause.
    • A statistically significant non-linear association between birthweight and breast cancer was identified (β=0.062, P=0.004 for squared birthweight).
    • The non-linear association was more pronounced in premenopausal women (27.5% increased risk) compared to postmenopausal women (19.5% increased risk).

    Conclusions:

    • The relationship between birthweight and breast cancer is driven by non-linear effects and causal mediation.
    • Birthweight's influence on breast cancer risk is complex, mediated by reproductive factors and exhibiting non-linear patterns.
    • Findings provide deeper insight into the nuanced connection between early-life factors and later cancer development.