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Birthweight as a risk factor for breast cancer
K B Michels1, D Trichopoulos, J M Robins
1Department of Epidemiology, Harvard School of Public Health, Boston, MA 02115, USA.
Lancet (London, England)
|December 7, 1996
Summary
Lower birthweight is linked to reduced breast cancer risk, suggesting early life factors influence cancer development. This study highlights the importance of intrauterine influences on long-term health outcomes.
Area of Science:
- Reproductive biology and cancer epidemiology.
- Investigating developmental origins of cancer.
- Perinatal influences on adult disease risk.
Background:
- The mammary gland's susceptibility to intrauterine factors during development.
- Evidence suggesting breast cancer may originate in utero.
- Need for studies on perinatal influences and breast cancer risk.
Purpose of the Study:
- To assess the association between birthweight and other perinatal factors with breast cancer risk.
- To explore intrauterine influences on breast cancer development.
- To identify early-life predictors of adult breast cancer.
Main Methods:
- Nested case-control study within the Nurses' Health Studies cohorts.
- Utilized maternal questionnaires for birthweight and perinatal data.
- Employed multiple logistic regression, adjusting for adult risk factors.
Main Results:
- Significant inverse association found between birthweight and breast cancer risk.
- Women with lower birthweights (<2500g) had significantly reduced odds of breast cancer.
- No significant association observed between prematurity and breast cancer risk.
Conclusions:
- Birthweight is a significant predictor of breast cancer risk, supporting intrauterine origins.
- Pregnancy hormones, such as estrogens, may play a role in breast carcinogenesis.
- Intrauterine factors during gestation may influence offspring's susceptibility to breast cancer.