Breast Cancer and the Pill: A Study on Oral Contraceptives
Author Information
Author(s): C.R. Kay, P.C. Hannaford
Primary Institution: RCGP Manchester Research Unit
Hypothesis
Is there an increased risk of breast cancer associated with the use of oral contraceptives?
Conclusion
The study suggests that oral contraceptive use may be associated with an increased rate of breast cancer presentation in women under 35 years of age.
Supporting Evidence
- Women aged 30 to 34 years at diagnosis had a significantly increased risk ratio of breast cancer of 3.33.
- The relative risk in women of parity 1 was 5.88.
- The five-year survival rate in users diagnosed under the age of 35 years was significantly poorer than in comparable non-users.
Takeaway
This study looks at whether taking the pill increases the chances of getting breast cancer, especially in younger women.
Methodology
A long-term prospective cohort study involving 23,000 women using oral contraceptives and matched controls, with data collected over several years.
Potential Biases
There is a possibility of screening bias, as OC users may be screened more frequently for breast cancer than non-users.
Limitations
The study faced issues with loss to follow-up and the inability to determine the age at first birth for all participants.
Participant Demographics
All participants were women, married or living as married, with a focus on those using oral contraceptives.
Statistical Information
P-Value
0.0011
Confidence Interval
2.02-17.1
Statistical Significance
p<0.05
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