CLCA2 as a Novel Immunohistochemical Marker for Differential Diagnosis of Squamous Cell Carcinoma from Adenocarcinoma of the Lung

Table 3

CLCA2 protein expression status in 161 primary squamous cell carcinomas of the lung and 235 primary adenocarcinomas of the lung.

Histology	CLCA2 protein expression			Sensitivity	Specificity
	Positive ( = 106)	Negative ( = 290)	value^a
Squamous cell carcinoma ( = 161)	104 (64.6%)	57 (35.4%)	<0.0001	64.6%	99.1%
Adenocarcinoma ( = 235)	2 (0.9%)	233 (99.1%)

Chi-square test.