Interval Cancers in Nijmegen Breast Cancer Screening
Author Information
Author(s): P.H.M. Peeters, A.L.M. Verbeek, J.H.C.L. Hendriks, R. Holland, M. Mravunac, G.P. Vooijs
Primary Institution: Nijmegen University
Hypothesis
Does shortening the screening interval reduce the occurrence of interval cancers in breast cancer screening programs?
Conclusion
Shortening the screening interval may reduce interval cancer rates, but many cases would still go undetected.
Supporting Evidence
- 26% of interval cancers were missed at the previous screening due to errors.
- 16% of interval cancers were radiographically occult at diagnosis.
- 58% of interval cancers were classified as 'true' interval cancers.
- Interval cancers showed similar survival rates to control breast cancer patients.
- 63% of interval cancers would not have been prevented by annual screenings.
Takeaway
Interval cancers are breast cancers that are found between regular screenings, and many of them are missed due to errors or are hard to detect.
Methodology
Data was collected from a population-based screening program in Nijmegen, where women underwent single-view mammography every two years.
Potential Biases
Potential bias due to the entry of new cohorts of women with denser breast tissue, making detection more difficult.
Limitations
The study did not account for 'pseudo-interval' cancers diagnosed after more than two years, and the prevalence of missed cancers did not decline over time.
Participant Demographics
Women aged 50 and under had higher rates of interval cancers compared to older women.
Statistical Information
P-Value
0.07
Statistical Significance
p=0.07
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