Oral Contraceptives and Breast Cancer Study
Author Information
Author(s): J.L. Stanford, L.A. Brinton, R.N. Hoover
Primary Institution: Fred Hutchinson Cancer Research Center; National Cancer Institute
Hypothesis
Is there a relationship between oral contraceptive use and breast cancer risk?
Conclusion
The study found no overall evidence of an association between oral contraceptives and breast cancer risk.
Supporting Evidence
- Ever use of oral contraceptives was not related to breast cancer risk.
- Women with a history of two or more breast biopsies had an increased risk (RR=2.0).
- Long-term use of oral contraceptives was associated with reduced risk for in situ cancer (RR=0.59).
- Invasive cancers showed increased risks associated with long-term use.
- Statistical analyses showed no consistent patterns of risk based on duration of use.
Takeaway
The study looked at whether taking birth control pills increases the chance of getting breast cancer, and it found that it doesn't.
Methodology
The study involved a multicenter case-control design with structured interviews to gather data on oral contraceptive use and breast cancer diagnosis.
Potential Biases
Potential surveillance bias may have influenced the results, as users of oral contraceptives may be more likely to undergo regular medical check-ups.
Limitations
The study excluded women with a history of breast cancer and focused primarily on white women, which may limit generalizability.
Participant Demographics
The study primarily included women diagnosed with breast cancer, with a focus on white women.
Statistical Information
Confidence Interval
95% CI 0.9-1.2
Statistical Significance
p<0.05
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