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Screening and cervical cancer cure: population based cohort study.
Bengt Andrae1, Therese M-L Andersson, Paul C Lambert
1Centre for Research and Development, Uppsala University/County Council of Gävleborg, S-80188 Gävle, Sweden. bengt.andrae@ki.se
BMJ (Clinical Research Ed.)
|March 3, 2012
Summary
Cervical cancer screening significantly improves cure rates, detecting invasive cancers earlier. This enhanced prognosis is not due to lead time bias but reflects a genuine improvement in treatment outcomes for screened individuals.
Area of Science:
- Oncology
- Public Health
- Gynecologic Oncology
Background:
- Cervical cancer screening programs aim to detect invasive cervical cancer early.
- The benefit of early detection versus lead time bias remains a critical question.
Purpose of the Study:
- To investigate whether cervical cancer detection through screening improves patient prognosis or merely lengthens the time before death.
- To quantify the impact of screening on cure proportions for invasive cervical cancer.
Main Methods:
- A nationwide population-based cohort study in Sweden.
- Followed 1230 women diagnosed with cervical cancer between 1999-2001 for an average of 8.5 years.
- Analyzed cure proportions and survival ratios stratified by screening history, detection method, and FIGO stage.
Main Results:
- Screen-detected invasive cervical cancer had a 92% cure proportion compared to 66% for symptomatic cases, a significant 26% difference.
- Women screened according to recommendations (interval cancers) had a 14% higher cure proportion than those overdue for screening.
- Improved cure proportion for screen-detected cancers persisted after adjusting for stage at diagnosis.
Conclusions:
- Cervical cancer screening is associated with improved cure rates.
- The observed benefit is not attributable to lead time bias and exceeds improvements from down-staging alone.
- Future evaluations of screening programs should incorporate cure proportion assessments.
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