Table 3.

Multivariate Cox regression analysis of overall survival and cancer-specific survival in the training group.

Variable	OS			CSS
	HR	95% CI	P	HR	95% CI	P
Age (y)
<55	1			1
55-78	1.218	1.068-1.390	0.003	1.204	1.031-1.405	0.019
>78	2.476	2.039-3.006	0.000	2.137	1.697-2.692	0.000
Size (mm)
<36	1			1
36-85	1.131	0.998-1.282	0.053	1.078	0.925-1.257	0.337
>85	1.363	1.118-1.661	0.002	1.292	1.014-1.645	0.038
Race
Black	1			1
Other	0.650	0.503-0.839	0.001	0.724	0.553-0.946	0.018
White	0.641	0.546-0.752	0.000	0.686	0.578-0.815	0.000
Primary site
Breast, NOS	1			1
Central portion	0.744	0.578-0.958	0.022	0.767	0.589-0.998	0.048
Lower-inner quadrant	1.021	0.825-1.264	0.846	1.044	0.834-1.308	0.706
Lower-outer quadrant	0.823	0.693-0.978	0.027	0.811	0.676-0.974	0.025
Other	0.975	0.833-1.142	0.752	0.980	0.829-1.158	0.811
Grade
I	1			1
II	1.297	1.063-1.583	0.010	1.293	1.048-1.597	0.017
III	1.755	1.425-2.160	0.000	1.806	1.450-2.249	0.000
IV	1.817	0.789-4.182	0.160	1.949	0.843-4.506	0.119
T stage
T1,T2				1
T3,T4				1.061	0.906-1.241	0.463
Surgery
No	1			1
Yes	0.601	0.528-0.683	0.000	0.593	0.518-0.680	0.000
Brain metastasis
No	1			1
Yes	1.977	1.560-2.506	0.000	2.003	1.566-2.562	0.000
Liver metastasis
No	1			1
Yes	1.910	1.643-2.221	0.000	2.016	1.726-2.355	0.000
Lung metastasis
No	1			1
Yes	1.219	1.063-1.398	0.005	1.185	1.026-1.370	0.021
ER
Negative	1			1
Positive	0.272	0.156-0.477	0.000	0.235	0.134-0.413	0.000
PR
Negative	1			1
Positive	0.634	0.543-0.740	0.000	0.587	0.501-0.689	0.000
Borderline	2.336	0.739-7.388	0.149	2.167	0.683-6.877	0.189
Insurance
No	1			1
Yes	0.755	0.581-0.980	0.035	0.727	0.556-0.950	0.020
Marital
No				1
Yes				0.916	0.807-1.040	0.176