Risk Factors for Breast Cancer by Oestrogen Receptor Status
Author Information
Author(s): J.A. Cooper, T.E. Rohan, E.L. McK. Cant, D.J. Horsfall, W.D. Tilley
Primary Institution: MRC Epidemiology and Medical Care Unit, Northwick Park Hospital
Hypothesis
Do menstrual, reproductive, dietary, and other factors affect breast cancer risk differently based on oestrogen receptor status?
Conclusion
The study found that while some factors are associated with increased risk of ER- breast cancer, there is not enough evidence to suggest different causal pathways for ER+ and ER- breast cancer.
Supporting Evidence
- ER+ breast cancer was more common in older and post-menopausal women.
- Oral contraceptive use was associated with increased risk of ER- cancer.
- Beta-carotene intake was linked to a reduction in risk of ER- breast cancer.
Takeaway
This study looked at women with breast cancer to see if different factors like diet and age affect their cancer risk based on whether their cancer cells have oestrogen receptors or not.
Methodology
A population-based case-control study involving 451 case-control pairs, with data collected through interviews and dietary questionnaires.
Potential Biases
Selection bias may have arisen from non-response by potential cases and controls.
Limitations
Potential selection bias due to non-response and misclassification of subjects regarding exposure.
Participant Demographics
Women aged 20 to 74 years residing in the Adelaide metropolitan area.
Statistical Information
P-Value
P=0.017 for beta-carotene intake
Confidence Interval
95% CI 2.26-9.09 for age and ER status association
Statistical Significance
p<0.05
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