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Increasingly strong reduction in breast cancer mortality due to screening

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TLDR
The results show an increasingly strong reduction in breast cancer mortality over time because of mammographic screening.
Abstract
Favourable outcomes of breast cancer screening trials in the 1970s and 1980s resulted in the launch of population-based service screening programmes in many Western countries. We investigated whether improvements in mammography and treatment modalities have had an influence on the effectiveness of breast cancer screening from 1975 to 2008. In Nijmegen, the Netherlands, 55 529 women received an invitation for screening between 1975 and 2008. We designed a case–referent study to evaluate the impact of mammographic screening on breast cancer mortality over time from 1975 to 2008. A total number of 282 breast cancer deaths were identified, and 1410 referents aged 50–69 were sampled from the population invited for screening. We estimated the effectiveness by calculating the odds ratio (OR) indicating the breast cancer death rate for screened vs unscreened women. The breast cancer death rate in the screened group over the complete period was 35% lower than in the unscreened group (OR=0.65; 95% CI=0.49–0.87). Analysis by calendar year showed an increasing effectiveness from a 28% reduction in breast cancer mortality in the period 1975–1991 (OR=0.72; 95% CI=0.47–1.09) to 65% in the period 1992–2008 (OR=0.35; 95% CI=0.19–0.64). Our results show an increasingly strong reduction in breast cancer mortality over time because of mammographic screening.

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Journal ArticleDOI

The benefits and harms of breast cancer screening: an independent review

TL;DR: It is concluded that screening reduces breast cancer mortality but that some overdiagnosis occurs, and results from observational studies support the occurrence of over Diagnosis, but estimates of its magnitude are unreliable.
Journal ArticleDOI

The benefits and harms of breast cancer screening: an independent review

TL;DR: The authors of as discussed by the authors reviewed the evidence on benefits and harms of breast screening in the context of the UK breast cancer screening programs and concluded that a 20% reduction is still the most reasonable estimate of the effect of the current UK screening programmes on breast cancer mortality.
Journal ArticleDOI

The descriptive epidemiology of female breast cancer: an international comparison of screening, incidence, survival and mortality

TL;DR: The future worldwide breast cancer burden will be strongly influenced by large predicted rises in incidence throughout parts of Asia due to an increasingly "westernised" lifestyle.
Journal ArticleDOI

Benefits and Harms of Breast Cancer Screening: A Systematic Review

TL;DR: Evidence for the relationship between screening and life expectancy and quality-adjusted life expectancy was low in quality and uncertainty remains about the magnitude of associated mortality reduction in the entire US population, among women 40 to 49 years, and with annual screening compared with biennial screening.
Journal ArticleDOI

The impact of mammographic screening on breast cancer mortality in Europe: a review of observational studies

TL;DR: From a systematic literature review of European trend studies, the best ‘European’ estimate of breast cancer mortality reduction is 25–31% for women invited for screening, and 38–48% for Women actually screened.
References
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Journal ArticleDOI

Effects of chemotherapy and hormonal therapy for early breast cancer on recurrence and 15-year survival: an overview of the randomised trials

O. Abe, +412 more
- 14 May 2005 - 
TL;DR: The 10-year and 15-year effects of various systemic adjuvant therapies on breast cancer recurrence and survival are reported and it is found that the cumulative reduction in mortality is more than twice as big at 15 years as at 5 years after diagnosis.
Journal ArticleDOI

Mammographic Density and the Risk and Detection of Breast Cancer

TL;DR: Extensive mammographic density is strongly associated with the risk of breast cancer detected by screening or between screening tests, and a substantial fraction of breast cancers can be attributed to this risk factor.
Journal ArticleDOI

Diagnostic Performance of Digital versus Film Mammography for Breast-Cancer Screening

TL;DR: The overall diagnostic accuracy of digital and film mammography as a means of screening for breast cancer is similar, but digital mammography is more accurate in women under the age of 50 years, women with radiographically dense breasts, and premenopausal or perimenopausal women.
Journal ArticleDOI

Estimability and estimation in case-referent studies

TL;DR: The concepts that case-referent studies provide for the estimation of "relative risk" only if the illness is "rare", and that the rates and risks themselves are inestimable, are overly superficial and restrictve.
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