From the NIH: Lung cancer mortality appears unaffected by roentgenographic and sputum screening in asymptomatic persons.
D005260:Female; D006801:Humans; D008175:Lung Neoplasms / Q000000981:diagnostic imaging / Q000401:mortality / Q000517:prevention & control*; D008297:Male; D008403:Mass Screening; D008875:Middle Aged; D009316:National Institutes of Health (U.S.); D013902:Radiography, Thoracic; D012306:Risk; D012907:Smoking / Q000150:complications; D013183:Sputum / Q000166:cytology; D014481:United States