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Background and aim: Endobronchial ultrasound-guided transbronchial needle aspiration (EBUS-TBNA) is the gold standard of lung cancer staging, yet up to 15% of procedures produce inadequate samples for definite diagnosis or staging. In such cases, more invasive surgical procedures are usually considered. Fluid collected during EBUS-TBNA is centrifuged to produce a pellet for cell block histopathological examination , while the supernatant is usually discarded. It has been demonstrated that this supernatant can provide material for next generation sequencing (NGS) mutation analysis using liquid biopsy (LB) technics when the procedure yielded positive results (tumor cells were demonstrated in the aspirate). We wish to assess whether LB NGS of the supernatant may provide data regarding lymph nodes involvement in non-small cell lung cancer (NSCLC) in cases with a negative EBUS-TBNA evaluatio
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