Lung Screening Cuts Mortality for Non-Smokers in China

New evidence shows one-time low-dose CT screening can significantly reduce lung cancer mortality in a non-risk based population.

Mar. 28, 2026 at 1:22am

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A new study from China's LungCare Project found that one-time low-dose computed tomography (LDCT) screening can significantly reduce lung cancer mortality, including among individuals with no smoking history. The study showed a 55% reduction in lung cancer-specific mortality and an even greater 72% reduction among women in the screening group compared to the control group.

Why it matters

Current lung cancer screening guidelines primarily target long-time or heavy smokers, overlooking a rapidly growing group of non-smokers who develop lung cancer due to factors like air pollution and genetic susceptibility. This study challenges the reliance on smoking history for eligibility, showing the potential benefits of broader screening approaches, especially in Asian populations where non-smokers make up a substantial proportion of lung cancer cases.

The details

The prospective non-randomized controlled study conducted between 2017-2021 in Guangzhou, China involved nearly 12,000 adults aged 40-74 who underwent LDCT screening, compared to a geographically matched control group receiving standard risk-based care. After 7 years, the screening group saw a 55% reduction in lung cancer-specific mortality. The mortality benefit was particularly pronounced among women, with a 72% risk reduction compared to 55% in men. Screen-detected lung cancers were also more likely to be diagnosed at an early stage, with 81.5% found at Stage I compared to just 25.1% in the non-screening group.

  • The study was conducted between 2017 and 2021 within the Chinese LungCare Project.
  • After 7 years of follow-up, the results were presented at the European Lung Cancer Congress (ELCC) 2026.

The players

Marina Garassino

A professor at the University of Chicago who was not involved in the study, but commented on the significance of the findings.

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What they’re saying

“Current screening guidelines were built around smoking history and in doing so, they leave behind a large and growing group of people who develop lung cancer despite never having smoked. In Asia, this is not a marginal issue: never-smoking women represent a substantial share of all lung cancer cases, driven by factors like air pollution and genetic risk rather than tobacco. The LUNG-CARE Project shows that when we screen beyond conventional risk criteria, we catch disease earlier, over 80% of screen-detected cancers were Stage I, and that translates directly into lives saved. A 72% mortality reduction in women is not a signal to note; it is a signal to act on.”

— Marina Garassino, Professor, University of Chicago

What’s next

Implementing mass LDCT screening comes with challenges, including the costs of imaging and follow-up tests, as well as the relatively high false positive rate that can lead to unnecessary procedures and patient anxiety. As a result, adoption into national programs has been slow, and participation remains uneven due to barriers like fear of diagnosis and low perceived personal risk.

The takeaway

This study highlights the need to reconsider current lung cancer screening eligibility criteria, which rely heavily on tobacco exposure, in order to better serve populations like those in Asia where a substantial proportion of cases occur in non-smokers. Broader screening approaches that account for factors like air pollution and genetic risk could lead to earlier detection and significantly improved outcomes.