Evaluation will be performed on consenting consecutive patients at least 18 years old, referred to bronchoscopy with suspicion for lung cancer according to chest CT-scan. Eligible patients should have either enlarged discrete N2/N3 lymph nodes, or central tumor or enlarged N1 lymph nodes with normal mediastinal lymph nodes. Exclusion criteria will be metastatic disease, severe co-morbidity that disqualified surgical treatment, mediastinal infiltration by tumor and small peripheral lung tumor with normal-sized mediastinal lymph nodes.