Value of endoscopic methylene blue and Lugol's iodine double staining and detection of GST-Π and telomerase in the early diagnosis of esophageal carcinoma

Table 2 GST-Π protein expression in esophageal carcinogenesis (n, %)

Histology	n	GST-Π expression				Positiverate (%)
		-	+	++	++
Normal epithelium	53	50	3	0	0	5.7
Hyperplasia	21	19	2	0	0	9.51
Dysplasia	79	30	34	12	3	62.0b
Carcinoma	55	9	30	13	3	83.6b

¹P>0.9,

^bP<0.001 vs normal epithelium.