"Results of Initial Low-Dose Computed Tomographic Screening for Lung Cancer" 
NEJM May 23
http://www.nejm.org/doi/full/10.1056/NEJMoa1209120?query=featured_home 
"CONCLUSIONS

The NLST initial screening results are consistent with the existing literature on screening by means of low-dose CT and chest radiography, suggesting that a reduction in mortality from lung cancer is achievable at U.S. screening centers that have staff experienced in chest CT. (Funded by the National Cancer Institute; NLST ClinicalTrials.gov number,NCT00047385.)"