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It is updating those guidelines based on recent new evidence, including last year’s CT scan vs. chest X-ray study, and will take into account the new X-ray study, too, said Dr. Michael LeFevre, co-vice chairman of the task force and a family physician at the University of Missouri. That process may take up to two years, he said.

Because CT scans also can yield false positive results, it is unlikely any group will recommend them for screening nonsmokers.

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Online:

JAMA: http://www.jama.ama-assn.org

National Cancer Institute: http://1.usa.gov/cndLsL

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AP Medical Writer Lindsey Tanner can be reached at http://www.twitter.com/LindseyTanner