"Screening for Lung Cancer With Low-Dose Computed Tomography: A Systematic Review to Update the U.S. Preventive Services Task Force Recommendation"
Annals Jul 30
http://annals.org/article.aspx?articleid=1721248 
"Conclusion: Strong evidence shows that LDCT screening can reduce lung cancer and all-cause mortality. The harms associated with screening must be balanced with the benefits."

"Screening for Lung Cancer: U.S. Preventive Services Task Force Recommendation Statement DRAFT" USPSTF   http://www.uspreventiveservicestaskforce.org./draftrec.htm   "The U.S. Preventive Services Task Force (USPSTF) recommends annual screening for lung cancer with low-dose computed tomography (LDCT) in persons at high risk for lung cancer based on age and smoking history."