Table 1:

Immunohistochemistry. Expression of EGFR, claudin-1, and ErbB2 in n = 24 resected human biliary stricture specimens was evaluated using immunohistochemistry. Staining results for normal, BilIN-1, BilIN-2, BilIN-3, and cholangiocarcinoma (CCA) are shown. Mixed grades included BilIN-1/3 (n = 2) and BilIN-2/3 (n =2).

Target	EGFR	claudln-1	ErbB2
Total (n=24)	7+/14−	20+/1−	7+/14−
BILIN-1 (n=7)	3+/4−	6+/1−	6+/1−
BILIN-2 (n=4)	1+/3−	3+/1−	3+/1−
BILIN-3 (n=6)	2+/5−	6+/0−	5+/1−
mixed (n=4)	1+/3−	3+/1−	4+/0−
normal (n=21)	0+/21−	5+/16−	1+/20−
CCA (n=16)	6+/10−	15+/1−	10+/6−