What is the difference between lung cancer screening methods?

The National Cancer Institute conducted a National Lung Screening Trial in 2010 involving 53,000 randomized, current and former heavy smokers aged 55 to 74. The trial compared the effects of two screening methods for lung cancer on lung cancer mortality: low-dose helical CT (also known as spiral CT) and standard chest X-ray. The results showed 20 percent fewer lung cancer deaths among the participants who were screened with low-dose helical CT.

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