Table 2.

The expression relationship between ABCG2 and V-ATPase in esophageal squamous cell carcinoma and in the pathological grading and TNM staging of esophageal squamous cell carcinoma

		Expression of ABCG2	Expression of V-ATPase			Total	Statistical value
			-	+	++
Esophageal Squamous Cell Carcinoma		-	21	1	0	22	${\bar{\chi }}^2=102.96$
		+	0	30	0	30	P = 0.000
		++	0	4	10	14	rs = 0.94
		Total	21	35	10	66
pathological grading	I	-	11	2	0	13	${\bar{\chi }}^2=15.0$
		+	0	0	0	0	P = 0.001
		++	0	0	2	2	rs = 0.76
		Total	11	2	2	15
	α	-	6	0	0	6	${\bar{\chi }}^2=48.0$
		+	0	17	0	17	P = 0.000
		++	0	0	1	1	rs = 1.00
		Total	6	17	1	24
	β	-	3	0	0	3	${\bar{\chi }}^2=32.1$
		+	1	12	0	13	P = 0.000
		++	0	4	7	11	rs = 0.80
		Total	4	16	7	27
TNM staging	αa	-	17	1	0	18	${\bar{\chi }}^2=20.5$
		+	0	9	0	9	P = 0.000
		++	0	0	0	0	rs = 0.856
		Total	17	10	0	27
	αb	-	2	0	0	2	${\bar{\chi }}^2=34.8$
		+	0	14	0	14	P = 0.000
		++	0	2	4	6	rs = 0.851
		Total	2	16	4	22
	β	-	2	0	0	2	${\bar{\chi }}^2=26.92$
		+	0	7	0	7	P = 0.000
		++	0	2	6	8	rs = 0.854
		Total	2	9	6	17