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Breast cancer screening.

I Jatoi1

  • 1Department of Surgery, Uniformed Services University of the Health Sciences, Bethesda, Maryland, USA.

American Journal of Surgery
|July 22, 1999
PubMed
Summary

Mammographic screening effectively reduces breast cancer mortality in women over 50. However, its benefits for younger women are debated, and potential harms like radiation exposure require careful consideration.

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Area of Science:

  • Oncology
  • Radiology
  • Preventive Medicine

Background:

  • Common breast cancer screening methods include mammography, breast self-examination (BSE), and physical examination (PE).
  • Previous studies examining screening efficacy are often subject to lead-time, length, and selection biases.
  • Randomized controlled trials (RCTs) are the gold standard for unbiased evaluation of screening modalities.

Purpose of the Study:

  • To review randomized controlled trials on breast cancer screening methods.
  • To assess the impact of mammography, BSE, and PE on breast cancer mortality.
  • To discuss potential biases and implications of breast cancer screening studies.

Main Methods:

  • Review of eight RCTs on mammographic screening and two RCTs on BSE screening.
  • Discussion of ongoing and planned RCTs for PE screening.
  • Analysis of study results to determine screening efficacy and identify biases.

Main Results:

  • Mammographic screening reduces breast cancer mortality by approximately 25% in women over 50.
  • The efficacy of mammography in women aged 40-49 is controversial, with ongoing trials to clarify this.
  • Preliminary results suggest BSE has no impact on breast cancer mortality, but longer follow-up is needed.

Conclusions:

  • Mammographic screening is effective for postmenopausal women but its benefit for premenopausal women is debated.
  • Potential harms of mammography include lead time effect, radiation exposure, false positives, and overdiagnosis.
  • Informed decision-making regarding mammography is crucial for women aged 40-49, considering both benefits and harms.

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