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Breast cancer mortality in Copenhagen after the introduction of mammography screening Anne Helene Olsen Department of Epidemiology, University of Copenhagen.

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Presentation on theme: "Breast cancer mortality in Copenhagen after the introduction of mammography screening Anne Helene Olsen Department of Epidemiology, University of Copenhagen."— Presentation transcript:

1 Breast cancer mortality in Copenhagen after the introduction of mammography screening Anne Helene Olsen Department of Epidemiology, University of Copenhagen Denne præsentation vil sandsynligvis medføre diskussion blandt tilhørerne, hvilket vil resultere i handlingspunkter. Hvis du vil bruge PowerPoint til at holde styr på dem under præsentationen, skal du Klikke med højre musknap i Diasvisning Vælge “Referent” Vælge fanen “Handlingspunkter” Skrive handlingselementerne, efterhånden som de kommer frem Klikke på OK for at slette denne boks Derved oprettes der automatisk et dias med handlingspunkter sidst i præsentationen, hvor de punkter, du har noteret, vil stå.

2 Danish programmes Screening of women aged every second year Copenhagen 1991: 40,000 women Frederiksberg 1994: 10,000 women Fyn 1993: 50,000 women Programmes cover 20% of Danish women aged 50-69

3 Objective To estimate the effect of the Copenhagen mammography screening programme on breast cancer mortality

4 Study and control groups CopenhagenRest of Denmark Before screening Screening period Historical control group Study group Historical national control group National control group

5 Methods Breast cancer mortality rates in the study group were compared with rates in the control groups, adjusting for age, period and region. Women were followed up from their first date of invitation to screening until death, emigration or end of follow-up. Refined mortality was used. Poisson regression was used for the analyses.

6 RR1: Region RR2: Region* screening Do regional differences in pre-screening period reflect those of the screening period? If not: Screening effect confounded with region*period interaction Screening effect estimated by RR2/RR1 Historical control group Study group Historical national control group National control group

7 Data sources 1.Mammography screening databases 2.Danish Cancer Register 3.Central Population Register 4.Cause of Death Register Linkage by personal identification number

8 Historical control group Study group Historical national control group National control group RR 1.22 RR 0.91 Results

9 Estimated effect of participating in screening: RR 0.63 Estimated effect of being offered screening: RR 0.75 (95% C.I ) Results

10 Since 1977: diagnostic and therapeutic strategies organised nationwide by Danish Breast Cancer Cooperative Group Regional differences time dependent? Breast cancer patients in study and control groups have been offered the same treatment

11 Conclusion It has been possible within the Copenhagen mammography screening programme to reduce breast cancer mortality by an estimated 25% for women offered screening and 37% for women participating in screening

12 Reference Olsen AH, Njor SH, Vejborg I, Schwartz W, Dalgaard P, Jensen M-B, Tange UB, Blichert-Toft M, Rank F, Mouridsen H, Lynge E. Breast cancer mortality in Copenhagen after introduction of mammography screening: cohort study. BMJ 2005; 330:

13 Financial support 1.Danish Medical Research Council 2.European Commission, DG Sanco 3.Danish Centre for Evaluation and Health Technology Assessment, Danish National Board of Health 4.Copenhagen Hospital Corporation


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