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Area of Science:

  • Oncology
  • Public Health
  • Epidemiology

Background:

  • The UK has had a national breast screening program since 1988.
  • Assessing the program's net benefit (lives saved vs. overdiagnosis) is crucial.
  • Previous screening evaluations, like for cervical cancer, have informed policy.

Purpose of the Study:

  • To estimate the benefits of the NHS Breast Screening Programme (NHSBSP) on breast cancer incidence and mortality.
  • To quantify the detrimental effects, specifically overdiagnosis.
  • To develop new methodologies for bias control in screening evaluations.

Main Methods:

  • Utilizing a case-control design with deaths from breast cancer as cases.
  • Comparing screening histories of cases and controls prior to diagnosis.
  • Including all breast cancer deaths and incident cases in England within 2-year periods.
  • Age- and area-matching cases and controls.
  • Collecting data on cancer treatment, tumor pathology, and attendance at other screening programs to control for bias.

Main Results:

  • Anticipates that if screening prevents mortality, cases will have fewer prior screenings than controls.
  • Will investigate the interplay between screening and treatment outcomes.
  • Aims to determine the effect of screening on the incidence of advanced-stage breast cancer.

Conclusions:

  • The study will provide essential data on the overall effectiveness and harms of the NHSBSP.
  • Findings will inform future policy regarding screening intervals and age ranges.
  • The proposed methodologies aim to improve the accuracy of screening program evaluations.