https://pubmed.ncbi.nlm.nih.gov/33141657/
"Long-term follow-up of the UK Age RCT" "There was a statistically significant 25% reduction in mortality from breast cancers diagnosed during the intervention phase at 10 years' follow-up"
"Long-term follow-up of the UK Age RCT" "There was a statistically significant 25% reduction in mortality from breast cancers diagnosed during the intervention phase at 10 years' follow-up"
But this is about screening of rather young women. Most established screening programs start at an age of 50. Still young. :-)