The 5-year results of the Danish Lung Cancer Screening Trial (DLCST) were reported in the April 2012 Thorax, and they show no mortality benefit from annual screening for lung cancer with chest CT. Rather, it appeared that more harmless early stage cancers were identified through screening -- "overdiagnosis" of cancers that would never have advanced or been lethal. The results are in discordance with the U.S.