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Mammographic screening: case-control studies.

S D Walter1

  • 1Clinical Epidemiology and Biostatistics, McMaster University, Health Sciences Centre, Hamilton, Ontario, Canada. walter@mcmaster.ca

Annals of Oncology : Official Journal of the European Society for Medical Oncology
|July 26, 2003
PubMed
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Case-control studies show mammography screening reduces breast cancer mortality by about 50%. This evidence supports individual decisions about mammography use, complementing randomized trial findings on screening effectiveness.

Area of Science:

  • Epidemiology
  • Public Health
  • Oncology

Background:

  • Case-control study designs are valuable for assessing cancer screening program benefits.
  • Mammographic screening for breast cancer is a key public health intervention.

Purpose of the Study:

  • To outline methodological features and potential biases of case-control designs in cancer screening evaluation.
  • To review existing case-control literature on mammographic screening.
  • To compare findings from case-control studies with randomized trials.

Main Methods:

  • Review of methodological aspects of case-control designs applied to screening programs.
  • Analysis of potential biases inherent in case-control studies.
  • Literature review of published case-control studies on mammographic screening.

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Main Results:

  • Case-control studies consistently demonstrate a ~50% reduction in breast cancer mortality with mammography.
  • Case-control studies suggest a greater benefit than initially shown in randomized trials.
  • Reconciliation of findings: trials show effectiveness (population-level), case-control studies show efficacy (individual-level).

Conclusions:

  • Case-control findings on mammography are consistent with randomized trial results.
  • Randomized trials inform public policy on the value of offering screening programs.
  • Case-control studies provide efficacy estimates relevant for individual women's decisions regarding mammography use.