RT Journal
A1 Keen JD, Keen J
T1 SCreen detection has both winners and losers
JF Archives of Internal Medicine
JO Archives of Internal Medicine
YR 2012
FD March 12
VO 172
IS 5
SP 447
OP 447
DO 10.1001/archinternmed.2011.1885
UL http://dx.doi.org/10.1001/archinternmed.2011.1885
AB 
Dr Welch is a pioneer in presenting the benefits and harms of screening to both clinicians and the public. However, Keen and Keen1- 2 were the first to devise the method to calculate the life-saving proportion (LSP) of screen-detected breast cancers, using matched 15-year periods. The follow-up analysis promoting screening mammography insight used 10-year periods.3 The higher percentage of screen-detected cancers (61%-64% vs 50%-56%) in the article by Welch and Frankel4 makes our estimates higher, while the mixed 20-year/10-year death/diagnosis risk makes our estimates lower.