NKX2-1 and lung cancer: No SGM-101 fluorescence, no CEACAM5 staining, and no other immunohistochemical staining were associated with markers of lung malignant neoplasms, including thyroid transcription factor 1 (TTF-1), cytokeratin 5/6 (CK 5/6), and p63 (Figure 4; eFigure 6 in Supplement 2).