Figure 5

Poorly differentiated adenocarcinoma. Histology (a), immunohistochemical stains for TTF-1 (b), p63 (c), high molecular weight keratin (d), and p16 (e), mucicarmine (f and inset), and immunohistochemical stain for surfactant precursor protein B (g) (all except inset, original magnification × 200; inset, original magnification × 400).