Table 7. Cox's regression analysis for pCA IX, MMP-9 and EGFR coexpression.

Hazard ratio	95% CI	P-value
No EGFR expression (N=21)
1.0		0.0002
EGFR only (N=75)
0.49	0.93–0.26	0.031
EGFR/MMP-9 or pCA IX coexpression (N=70)
3.25	1.70–6.20	0.0004

EGFR=epidermal growth factor receptor; MMP-9=metalloproteinase-9; pCA=perinuclear carbonic anhydrase; 95% CI=95% confidence intervals.