Table 6.

Multivariate Cox proportional hazard regression of survival for the patients from the USA1 cohort

Covariate	Hazard ratio	95% Confidence interval	P-value
IC30 + vs. -	2.21	(1.32, 3.70)	0.002
Age (per year)	1.00	(0.98, 1.02)	0.940
Lymph node + vs. -	2.07	(1.35, 3.16)	< 0.001
Tumor size ≥ T3 vs. < T3	1.73	(1.16, 2.57)	0.007
Grade 3 vs. 1,2	0.67	(0.41, 1.11)	0.119
ER + vs. -	0.58	(0.33, 1.01)	0.055
PR + vs. -	0.76	(0.45, 1.31)	0.330