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June 9, 2017. This NEJM SEER analysis examined size distributions of detected breast cancers from 1975-1979 (pre-mammography) as compared to those from 2000-2002. The results show an increase in proportion of detected small (<2cm) tumors from 36% -> 68% and a proportional decrease of detected large (≥2cm) tumors from 64% -> 32%. However, this proportional shift is largely due to an overall increased detection of small tumors, and any size-specific mortality improvements appear attributable to treatment advances, not early detection. Which all begs the question if mammography is creating more cancer cures...or more cancers.