Effect of organized mammography screening on breast cancer mortality: A population-based cohort study in Norway

International Journal of Cancer. Journal International Du Cancer
Mette H MøllerHenrik Støvring

Abstract

We aimed to estimate the effect of organized mammography screening on incidence-based breast cancer mortality by comparing changes in mortality among women eligible for screening to concurrent changes in younger and older ineligible women. In a county-wise balanced, open-cohort study, we used birth cohorts (1896-1982) to construct three age groups in both the historical and screening period: women eligible for screening, and younger or older women ineligible for screening. We included women diagnosed with breast cancer who died within the same age-period group during 1987-2010 (n = 4,903). We estimated relative incidence-based mortality rate ratios (relative MRR) comparing temporal changes in eligible women to concurrent changes in ineligible women. Additionally, we conducted analyses comparing the change in eligible women to younger, ineligible women with either continued accrual and follow-up period (eligible women only) or continued follow-up period. All three age groups experienced a reduction in mortality, but the decrease among eligible women was about the same among ineligible women (relative MRR = 1.05, 95% CI: (0.94-1.18)). Varying the definition of follow-up yielded similar results. Mammography screening was not assoc...Continue Reading

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Citations

Jun 30, 2019·International Journal of Cancer. Journal International Du Cancer·Per-Henrik ZahlErik Nord
Dec 19, 2019·Journal of the National Cancer Institute·Sofie SebuødegårdSolveig Hofvind
Jul 17, 2020·Journal of Clinical Oncology : Official Journal of the American Society of Clinical Oncology·Andrew M McDonaldSmita Bhatia

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