Just online..
We use population based study of women participating in organized screening mammography to highlight the inefficiencies of such screening program: we show that mammography catches less harmful cancers and leaves out the more lethal ones. https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2770959

First – there is a printing error in the abstract: number of mammograms performed is 212, 579 not just 212.. will be corrected next week

Manitoba has had a strong population based screening program for > 2 decades, where all women in the province are invited by a personal letter starting on their 50th birthday to participate in “BreastCheck”, the government funded screening program every ~2 years

We looked at all women who underwent such screening mammogram from 2004-2010 and compared biology and outcomes of mammographically detected cancers to those detected in-between screening mammograms (interval breast cancers) in those women

We found that interval cancers were 6 times more aggressive than mammogram detected cancers. Women with interval cancers were also 3 times more likely to die from their breast cancer.