At 2 weeks later in the pulmonary clinic, immunohistochemistry of samples from the right hilar lymph node obtained via endobronchial ultrasound confirmed thyroid transcription factor-1 (TTF-1) + adenocarcinoma and low positive programed death ligand 1 (PD-L1) at 30% (Fig. 3). The gene discussed is NKX2-1; the disease is adenocarcinoma.