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Table 1 Population: all patients and patients according to initial data set or validation set

From: Lymph node positivity in different early breast carcinoma phenotypes: a predictive model

  All patients Initial set Validation set
  Nb % Nb % Nb %
Nb patients 12,572   8381   4191  
Age median (range) 58 (18–101) 58 (18–101) 58 (18–100)
<  60 7231 58 4857 58 2374 57
 61–65 1810 14 1166 14 644 15
 >  65 3525 28 2355 28 1170 28
Median tumor size 14   14   14  
<  10 4701 38 3136 38 1565 38
 11 to 20 5053 41 3368 41 1685 41
 >  20 2679 22 1784 22 895 22
No SN removed
 1 3268 31 2203 31 1065 31
 2 3374 32 2231 31 1143 33
 3 2034 19 1382 20 652 19
  > 4 1886 18 1271 18 615 18
Tumor type
 Ductal 9793 78 6522 78 3271 78
 Lobular 1645 13 1110 13 535 13
 Mixt 226 2 144 2 82 2
 Others 899 7 599 7 300 7
Grade
 1 4246 34 2891 35 1355 33
 2 5756 46 3800 46 1956 47
 3 2448 20 1611 19 837 20
LVI
 Negative 8430 78 5661 78 2769 77
 Positive 2400 22 1595 22 805 23
Estrogen receptors
 negative 1730 14 1146 14 584 14
 positive 10,828 86 7227 86 3601 86
Progesterone receptors
 negative 3464 29 2281 29 1183 30
 positive 8522 71 5701 71 2821 70
Hormonal receptors
 negative 1541 12 1020 12 521 12
 positive 11,013 88 7349 88 3664 88
Her2 status
 negative 11,350 90 7570 90 3780 90
 positive 1222 10 811 10 411 10
Tumor sub types
 Luminal A 8998 72 6026 72 2972 71
 Luminal B Her2- 1178 9 756 9 422 10
 HR+ Her2+ 766 6 521 6 245 6
 HR- Her 2+ 450 4 288 3 162 4
 Triple Negative 1091 9 732 9 359 9
pN final
 pN0(i-) 8253 66 5507 66 2746 66
 pN0(i+) 355 3 233 3 122 3
 pN1mi 970 8 660 8 310 7
 Macro 2994 24 1981 24 1013 24
Clinical size
 T0 2764 23 1831 23 933 23
 T1 6784 57 4544 57 2246 56
 T2 2115 18 1383 17 732 18
  > T3 283 2 187 2 96 2