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. 2020 Mar;8(5):197. doi: 10.21037/atm.2020.01.37

Table 2. Univariate Cox regression analysis of OS and CSS in the training cohort.

Variable OS CSS
HR 95% CI P HR 95% CI P
Age (years)
   20–40 1 1
   41–60 0.922 0.779–1.092 0.347 0.945 0.790–1.130 0.534
   61–80 0.854 0.719–1.014 0.071 0.868 0.724–1.042 0.128
Race
   White 1 1
   Black 1.076 0.941–1.231 0.282 1.061 0.921–1.222 0.413
   Others 1.114 0.934–1.329 0.229 1.075 0.891–1.298 0.447
Laterality
   Left 1 1
   Right 1.043 0.946–1.150 0.397 1.04 0.939–1.152 0.454
Tumor grade
   I 1 1
   II 1.299 1.065–1.585 0.01 1.404 1.130–1.745 0.002
   III/IV 1.952 1.605–2.375 <0.001 2.155 1.739–2.670 <0.001
T stage
   T1 1 1
   T2 1.002 0.847–1.187 0.978 0.97 0.813–1.157 0.733
   T3 1.205 1.005–1.445 0.044 1.2 0.993–1.451 0.06
   T4 1.394 1.176–1.651 <0.001 1.397 1.170–1.667 <0.001
N stage
   N0 1 1
   N1 0.99 0.872–1.124 0.878 0.998 0.872–1.141 0.972
   N2 0.902 0.762–1.069 0.234 0.899 0.751–1.077 0.248
   N3 1.003 0.858–1.173 0.967 1.042 0.884–1.227 0.627
Histological type
   Ductal 1 1
   Lobular 0.959 0.817–1.125 0.606 0.964 0.815–1.140 0.67
   Mixed ductal and lobular 0.857 0.684–1.074 0.181 0.859 0.678–1.088 0.208
   Others 1.642 1.349–1.999 <0.001 1.705 1.392–2.088 <0.001
Tumor size (cm)
   <5 1 1
   5–10 1.235 1.114–1.369 <0.001 1.263 1.134–1.408 <0.001
   >10 1.836 1.521–2.215 <0.001 1.954 1.613–2.368 <0.001
Tumor subtype
   Luminal A 1 1
   Luminal B 0.883 0.767–1.017 0.085 0.865 0.746–1.004 0.056
   HER2+ 1.175 0.959–1.439 0.119 1.168 0.944–1.444 0.153
   Triple-negative 3.366 2.931–3.866 <0.001 3.482 3.013–4.023 <0.001
Surgery
   Yes 1 1
   No 1.842 1.658–2.047 <0.001 1.814 1.624–2.026 <0.001
Radiotherapy
   Yes 1 1
   No 0.996 0.903–1.098 0.928 0.959 0.865–1.063 0.424
Chemotherapy
   Yes 1 1
   No 1.269 1.150–1.401 <0.001 1.238 1.116–1.374 <0.001
Number of metastatic organs except bone
   0 1 1
   1 1.678 1.504–1.873 <0.001 1.735 1.547–1.947 <0.001
   ≥2 3.078 2.676–3.541 <0.001 3.24 2.798–3.751 <0.001

Grade I: well differentiated; Grade II: moderately differentiated; Grade III: poorly differentiated; Grade IV: undifferentiated anaplastic. OS, overall survival; CSS, cancer-specific survival.