Mammography Screening for Women Aged 40-41
Author Information
Author(s): Sue Moss, Margaret Waller, T J Anderson, H Cuckle
Primary Institution: Cancer Screening Evaluation Unit, Institute of Cancer Research
Hypothesis
Does annual mammographic screening from age 40 reduce breast cancer mortality?
Conclusion
The study suggests that screening from age 40 may lead to a smaller reduction in breast cancer mortality than previously observed in other trials.
Supporting Evidence
- An 8% excess of invasive breast cancers was found in the intervention arm.
- The predicted reduction in breast cancer mortality was between 10% and 11%.
- Uptake of screening invitations was around 70%.
Takeaway
This study looked at whether inviting women aged 40 to get mammograms helps them live longer by catching breast cancer early. It found that the benefit might not be as big as expected.
Methodology
The trial randomized 160,921 women into intervention and control groups to compare breast cancer mortality based on screening.
Potential Biases
Potential overdiagnosis due to earlier detection in the intervention group.
Limitations
The study relies on surrogate outcome measures and has uncertainties regarding the actual mortality reduction.
Participant Demographics
Women aged 40-41 at entry, with a total of 160,921 participants.
Statistical Information
P-Value
0.89 (0.79–1.00)
Confidence Interval
95% CI 0.78–1.01
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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