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Stage shift, histological differentiation, and survival patterns of lung squamous cell carcinoma versus adenocarcinoma in low-dose CT screening.

Yaguang Fan·Ying Wang·Xuebing Li·Heng Wu·Hongli Pan·Yong Jiang·Zhaowei Meng·Jing Wang·Jun Chen·Qinghua Zhou·Youlin Qiao
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Abstract

BACKGROUND: Whether LDCT-associated stage shift translates into similar survival patterns across lung cancer histologies remains uncertain. We compared stage shift, histological differentiation, tumor characteristics, and survival between lung squamous cell carcinoma (LUSC) and adenocarcinoma (LUAD) in the National Lung Screening Trial. METHODS: Among participants diagnosed with LUSC or LUAD, stage distribution and histological differentiation were compared between LDCT and chest X-ray (CXR) arms. Survival among diagnosed cases was measured from randomization. Multivariable models tested screening arm-by-histology interactions. Screen-detected LDCT tumors were compared by histology. RESULTS: During 6.5 years of median follow-up, 498 LUAD and 249 LUSC cases were diagnosed in the LDCT arm, and 374 and 212, respectively, were diagnosed in the CXR arm. LDCT was associated with higher odds of stage I disease for LUAD (adjusted odds ratio [aOR], 2.48; 95% CI 1.88-3.28) and LUSC (aOR, 1.71; 95% CI 1.17-2.48), without significant interaction (P&#x202f;=&#x202f;0.116). LDCT was associated with lower hazard of lung cancer-specific death among diagnosed LUAD cases (adjusted hazard ratio [aHR], 0.54; 95% CI 0.43-0.66), but not among diagnosed LUSC cases (aHR, 1.04; 95% CI 0.78-1.39; P for interaction<0.001). LUSC had lower screening sensitivity, more frequent detection in annual screening rounds, greater prediagnostic tumor size increase, and fewer well-differentiated stage I tumors than LUAD. CONCLUSION: LDCT was associated with stage shift for both subtypes, but favorable survival patterns among diagnosed cases were mainly observed for LUAD. Lower screening sensitivity, greater prediagnostic tumor size increase, and poorer histological differentiation may help explain why stage shift did not translate into similar survival patterns for LUSC. TRIAL REGISTRATION: ClinicalTrials.gov, NCT00047385.

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HumansLung NeoplasmsFemaleCarcinoma, Squamous CellMaleTomography, X-Ray ComputedNeoplasm StagingMiddle AgedAgedAdenocarcinomaEarly Detection of CancerAdenocarcinoma of LungHistological differentiationLow-dose CTLung cancer screeningSquamous cell carcinomaStage shiftSurvivalJournal ArticleRandomized Controlled TrialComparative Study

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Yaguang Fan, Ying Wang, Xuebing Li, Heng Wu, Hongli Pan, Yong Jiang, Zhaowei Meng, Jing Wang, Jun Chen, Qinghua Zhou, Youlin Qiao. 2026-08-11. Stage shift, histological differentiation, and survival patterns of lung squamous cell carcinoma versus adenocarcinoma in low-dose CT screening.. https://doi.org/10.1016/j.canep.2026.103197

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