The pathological study reported poorly differentiated adenocarcinoma, with immunohistochemistry showing CK5/6 (-), P40 (few +), EGFR (sp111) (1+), EGFR (sp125) (+), CK7 (+), TTF-1 (+), Ki-67 (60%+), VENTANA ALK (D5F3) (-), BRAF (-), and PD-L1 (Daco 22C3) < 1% (Fig. 2). Here, EGFR is linked to adenocarcinoma.