New lung cancer screening guidelines from three medical groups recommend annual scans but only for an older group of current or former heavy smokers.
The advice applies only to those age 55 to 74. The risks of screening younger or older smokers or nonsmokers outweigh any benefits, according to the guidelines.
About 8 million Americans would be eligible for screening under the new criteria, and if all of them got the scans, about 4,000 lung cancer deaths per year could be prevented.
The recommended screening involves low-dose CT scans, which are a special kind of X-ray that can detect lung cancer early, but also can have false-positive results.
Regular chest X-rays can also detect lung cancer, but they provide less detailed images than CT scans, can also have false-positive results and have not been recommended as a screening tool because they have not been shown to save lives. The guidelines were published online Sunday in the Journal of the American Medical Association.
An estimated 226,000 Americans will be diagnosed with lung cancer this year. It is the leading cause of cancer deaths for U.S. men and women. An estimated 160,000 lung cancer deaths nationwide will occur this year.
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