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Table 2

Spearman’s correlation coefficients(r) and associated probabilities (P) for the correlations among mRNA levels in colorectal cancer tissues

We determined that a strong correlation would have a r value of 0.7 or above and that a weak correlation would have a rvalue of less than or equal to 0.5.

	Tumor	MDR1	MRP1	MRP2	MRP3
Normal tissue
MDR1	r		0.4908	0.4853	0.4600
	P		0.0003^a	0.0004^a	0.0008^a
MRP1	r	0.2331		0.4343	0.6812
	P	0.1032		0.0016^a	0.0000^a
MRP2	r	0.3403	0.5842		0.3585
	P	0.0156^a	0.0000^a		0.0106^a
MRP3	r	0.4495	0.7065	0.5563
	P	0.0011^a	0.0000^a	0.0000^a

	Tumor	MDR1	MRP1	MRP2	MRP3
Normal tissue
MDR1	r		0.4908	0.4853	0.4600
	P		0.0003^a	0.0004^a	0.0008^a
MRP1	r	0.2331		0.4343	0.6812
	P	0.1032		0.0016^a	0.0000^a
MRP2	r	0.3403	0.5842		0.3585
	P	0.0156^a	0.0000^a		0.0106^a
MRP3	r	0.4495	0.7065	0.5563
	P	0.0011^a	0.0000^a	0.0000^a

^a

Significant(P < 0.05).