A new publication Valerie Sankatsing et al (Department of Public Health, Erasmus MC) presents findings that show that the implementation of mammography screening in Dutch municipalities is associated with a significant decline in breast cancer mortality in women aged 55-79 after 20 years of follow-up.
Their aim was to assess the long-term effect of screening by age and time of implementation. Breast cancer mortality trends were analyzed by defining the municipality-specific calendar year of introduction of screening as Year 0. Twenty years after introduction of screening breast cancer mortality was reduced by 30% in women aged 55-74 and by 34% in women aged 75-79, compared to Year 0.
https://www.ncbi.nlm.nih.gov/pubmed/28457023