Adjuvant chemotherapy for completely resected stage IB-IIA non-small cell lung cancer according to the AJCC 8th edition staging system: a real-world retrospective cohort study based on the SEER database

CONCLUSIONS: This study provides real-world evidence that adjuvant chemotherapy was associated with improved OS and LCSS outcomes in completely resected stage IIA NSCLC, particularly among those with high-risk features; however, it was not associated with improved survival in stage IB patients, regardless of their risk status.