MA03.03 Predicting Occult Lymph Node Metastasis in Patients with Clinical Stage IA Non-small Cell Lung Cancer: A Prospective Cohort Study

Nodules with GGO components have been known as indolent tumors with a low risk of node metastasis, while occult lymph node metastasis (OLNM) is observed in 15-20% even in clinical stage I non-small cell lung cancer (NSCLC) with radiologically solid nodules. We aimed to evaluate predictive factors for occult lymph node metastasis (OLNM) in clinical stage IA NSCLC patients using a prospective observational cohort (OREX-1A: Optimal Extent of Pulmonary Resection in Clinical Stage IA Non-Small Cell Lung Cancer (NCT03066297)).