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The National Lung Screening Trial Analysis Team: Results of Initial Low-Dose Computed Tomographic Screening for Lung Cancer Lung cancer may be the largest single reason behind deaths from tumor in the world1-3 and is expected to account for more than 160,000 deaths in the United States during 2013 levitra reviews .4 Most patients with lung cancer possess smoked cigarettes.5 Of 94 million U.S. Smokers, half are former smokers whose risk remains elevated years after cessation.6 In the National Lung Screening Trial of screening for lung cancer in older persons who were heavy smokers,7 mortality from lung cancer was lower with the use of 3 years of annual screening with low-dose helical computed tomography than with the use of chest radiography.8 Furthermore, the Prostate, Lung, Colorectal, and Ovarian Cancer Screening Trial 9 demonstrated that among approximately 30,000 individuals with baseline characteristics which were similar to those of the NLST individuals, mortality from lung cancer did not differ significantly between individuals undergoing screening by means of chest radiography and the ones receiving usual care,10 confirming the results of previous randomized trials of screening with the use of chest radiography.11-13 The NLST, a joint effort of the Lung Screening Research and the American College of Radiology Imaging Network , both funded by the National Cancer Institute , began randomly assigning participants in August 2002 to annual screening for three years by using either low-dosage CT or chest radiography.

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