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The Canadian National Breast Screening Study: a Canadian critique
1Department of Radiology, University of British Columbia, Vancouver, Canada.
AJR. American Journal of Roentgenology
|October 1, 1993
Summary
The Canadian National Breast Screening Study evaluated mammography for women aged 40-59. It found that screening women aged 50-59 with mammography reduced breast cancer mortality.
Area of Science:
- Oncology
- Radiology
- Epidemiology
Background:
- The Canadian National Breast Screening Study (CNBSS) pioneered research into breast cancer screening efficacy for younger women.
- Previous screening guidelines primarily focused on older age groups.
Purpose of the Study:
- To determine the effectiveness of mammography screening in women aged 40-49 and 50-59.
- To compare mammography plus physical examination against usual care or physical examination alone.
Main Methods:
- Randomized controlled trial design involving two age cohorts: 40-49 years and 50-59 years.
- Intervention groups received annual mammography and physical examinations.
- Control groups received usual care or annual physical examination only.
Main Results:
- Mammography screening for women aged 50-59 significantly reduced breast carcinoma mortality.
- Results for women aged 40-49 were less conclusive and required further investigation.
Conclusions:
- Annual mammography screening is effective in reducing breast cancer mortality for women aged 50-59.
- The efficacy of mammography for women aged 40-49 warrants further study and consideration.