Table 1. Immunohistochemical findings for lung squamous cell carcinoma and lung adenocarcinoma.

Marker	Lung squamous cell carcinoma						Lung adenocarcinoma
	Number of positive cases (%)	Immunoreactivity score†					Number of positive cases (%)	Immunoreactivity score†
		0	1+	2+	3+			0	1+	2+	3+
Glypican-1	63/63 (100%)	0	0	2	61		2/60 (3.3%)	58	2	0	0
p40	63/63 (100%)	0	0	3	60		5/60 (8.3%)	55	5	0	0
CK 5/6	62/63 (98.4%)	1	2	6	54		10/60 (16.6%)	50	5	4	1
TTF-1	4/63 (6.3%)	59	3	1	0		54/60 (90.0%)	6	3	5	46
Napsin A	2/63 (3.2%)	61	2	0	0		49/60 (81.6%)	11	7	3	39

^†, 0: negative; 1+: <10% positive; 2+: 10% to 50% positive; 3+: >50% positive. CK, cytokeratin; TTF-1, thyroid transcription factor-1.