Table 3. Correlation between expression of MDR1/P-gp and MRP-1 protein in primary vs metastatic specimens.

Tumour site	No. of cases	MDR P-gp (%)	P	No. of cases	MRP-1 (%)	P
Primary	46/92	50	0.010*	52/92	56.5	P<0.000*
Metastasis	31/42	73.8		38/42	90.5

Abbreviations: MDR1/P-gp=multi-drug resistance; MRP=multidrug resistance-associated protein.

P values from χ² analyses; ^*indicates significant parameter.