Breast Cancer and Oral Contraceptives
Author Information
Author(s): J.D. Shelton
Primary Institution: Office of Population, Agency for International Development
Conclusion
The use of hospital controls in studies on breast cancer and oral contraceptives may introduce biases that inflate the observed risks.
Supporting Evidence
- Hospitalized controls may have chronic conditions that affect their contraceptive use.
- Women in developing countries may use oral contraceptives less due to health concerns.
- Detection bias may increase with the recency of oral contraceptive use.
Takeaway
This letter discusses how using hospital patients as control subjects in studies might lead to misleading results about the risks of breast cancer from oral contraceptives.
Potential Biases
Hospital controls may have chronic conditions that affect their contraceptive use, leading to inflated relative risks for breast cancer among oral contraceptive users.
Limitations
The commentary highlights potential biases in the selection of hospital controls that could affect the study's findings.
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