Studies Included	Comments	Conclusions
3 RCTs* in women aged 40 to 70 years, 1 RCT specific to 40- to 49-year old women, 1 non-RCI; 2 historical cohort studies.	Report submitted to working group of 16 experts for evaluation of mass screening mammography, peer-reviewed by 25 experts. No evidence that screening of younger women had any benefit with respect to breast cancer mortality.	No extension of the French program to women aged 40– 49 years should be envisaged until efficacy and cost-effectiveness in older women (50–74 years) have been proven.

^*RCT indicates randomized controlled trial.