Table 1.

Expression degree of MDR proteins

MDR proteins*	Expression**				Positive numbers***
	-	+	++	+++
ToPo II	31 (26.1%)	61 (51.3%)	18 (15.1%)	9 (7.5%)	88 (73.9%)
MRP	68 (57.1%)	46 (38.7%)	4 (3.4%)	1 (0.8%)	51 (42.9%)
GST-π	58 (48.7%)	54 (45.4%)	7 (5.9%)	0 (0)	61 (51.3%)

^*r=0.764, the expression of MRP is correlated strong positively with GST-π;

^** P>0.05, MRP vs GST-π;

^*** P<0.05, ToPo II vs MRP.

P<0.05, ToPo II vsGST-π; P>0.05, MRP vs GST-π.