Table 2. Results of Cox proportional hazard analysis of independent risk factors for survival prediction.

Cox regression analysis		DSS
Mannheim	HR	95% CI	p
Luminal	4.94	1.56-15.63	0.007
Chungbuk	HR	95% CI	p
Age	1.06	1.01-1.10	0.009
pN+	4.31	1.72-10.81	0.002
Luminal	3.76	1.50-9.46	0.005
T2 vs. T3, T4	2.90	1.17-7.19	0.022
MDA	HR	95% CI	p
NAC	3.57	1.30-9.80	0.013

HR = hazard ration, CI = confidence interval, NAC = neoadjuvant chemotherapy.