Early-stage lung cancer detection may extend beyond traditional high-risk smoker populations, potentially reshaping screening guidelines for broader demographic groups. This finding challenges the conventional wisdom that low-dose CT screening primarily benefits heavy smokers in Western populations.
A comprehensive analysis of 4,478 Thai adults undergoing low-dose computed tomography revealed a 1.2% cancer detection rate, with 70% of cancers caught at stage 0-IB. Notably, 84% of participants were never-smokers, yet the screening identified 53 lung cancers, predominantly adenocarcinomas with solid morphology. The screening protocol used advanced 256-slice spectral CT technology with radiation exposure under 1.5 mSv, interpreted using standardized Lung-RADS criteria.
This research fills a critical gap in Southeast Asian lung cancer screening data, where genetic predispositions and environmental exposures may differ significantly from Western populations. The high proportion of early-stage cancers detected suggests that broader screening programs could substantially improve survival outcomes in regions with limited smoking-based risk stratification. Age over 55, smoking history, coronary artery calcification, and previous extrapulmonary malignancy emerged as independent predictors.
The study's limitation lies in its single-center design at a private Bangkok hospital, potentially limiting generalizability across socioeconomic strata. However, the substantial detection rate among non-smokers represents a paradigm-shifting finding that warrants expanded screening considerations. This data supports expanding eligibility criteria beyond smoking-centric guidelines, particularly in Asian populations where lung cancer patterns may reflect different environmental and genetic risk factors than those established in predominantly Caucasian cohorts.