Table 1. The distribution and the intensity of each marker at the different morphological structures.

Marker		TTF-1		Napsin A		SP-A		CD44		CD133
Distribution of each marker
	Score	DS	IE	DS	IE	DS	IE	DS	IE	DS	IE
	Primary	2	+++	2	+++	1	+++	3	+++	2	++
	F1	1	+++	1	+++	1	++	2	++	1	+
	F2	0	-	0	-	1	+	1	+	1	+
	F2(C)	0	-	0	-	1	+	2	+	1	+
Intensity of each marker in the glandular and solid structure
	Structurea	G	S	G	S	G	S	G	S	G	S
	Primary	+++	-	+++	-	-	+++	+++	+++	+++	++
	F1	+++	-	+++	-	-	+++	+++	++	++	+
	F2	-	-	-	-	-	+	+	+	+	+
	F2(C)	-	-	-	-	-	+	++	++	+	+

DS (distribution of staining) was scored according to the following criteria: 0 (tumor cells were negative), 1 (5%–25% positive tumor cells), 2 (25%–60% positive tumor cells) and 3 (more than 60% positive cells); IE (intensity expression score) was based on the followings: (−) negative; (+) weak; (++) moderate; (+++) strong.

^aG, glandular structure; S, solid structure.