Oral Contraceptives and Breast Cancer
Author Information
Author(s): S.S. Jickl, A.M. Walker, A. Stergachis, H. Jick
Primary Institution: Group Health Cooperative of Puget Sound
Hypothesis
Is there a relationship between oral contraceptive use before first pregnancy and the risk of breast cancer in young women?
Conclusion
The study found no significant association between oral contraceptive use before first pregnancy and the risk of breast cancer.
Supporting Evidence
- Use of oral contraceptives before first pregnancy did not materially differ between cases or controls.
- The rate ratio estimate of breast cancer incidence in women who had used oral contraceptives before first pregnancy was 0.9.
- There were no meaningful patterns of association between breast cancer and duration of use or formulation of oral contraceptive used before first pregnancy.
- Nulliparity and late age of first pregnancy were more common among cases than controls.
Takeaway
The study looked at whether using birth control pills before having a baby increases the chance of getting breast cancer, and it found that it doesn't.
Methodology
A population-based case-control study was conducted among young women at Group Health Cooperative of Puget Sound, analyzing data from interviews and medical records.
Potential Biases
There may be risks of recall bias and selection bias, although efforts were made to mitigate these.
Limitations
The study may not account for all potential confounding factors and relies on self-reported data.
Participant Demographics
Women under 43 years of age, primarily Caucasian, with a history of breast cancer and matched controls.
Statistical Information
P-Value
0.2
Confidence Interval
(0.4, 2.1)
Statistical Significance
p=0.2
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