Table 1.
Patient characteristics
| Training set | Validation set | |
|---|---|---|
| Number of patients |
92 |
95 |
| Age median |
59 |
58 |
|
Histologic type |
|
|
| IDC |
75 |
54 |
| ILC |
8 |
8 |
| Other |
9 |
33 |
|
Histologic grade |
|
|
| G1 |
8 |
14 |
| G2 |
33 |
31 |
| G3 |
47 |
49 |
| Missing |
4 |
1 |
|
Tumor size |
|
|
| T ≤2 cm |
34 |
65 |
| T >2 cm |
55 |
30 |
| Missing |
3 |
|
|
Estrogen receptor |
|
|
| Positive |
58 |
73 |
| Negative |
28 |
22 |
| Missing |
6 |
|
|
Progesterone receptor |
|
|
| Positive |
48 |
73 |
| Negative |
41 |
22 |
| Missing |
3 |
|
|
HER2 overexpression |
|
|
| Positive |
17 |
21 |
| Negative |
60 |
73 |
| Missing |
15 |
1 |
|
Lymph node involvement |
|
|
| Positive |
43 |
36 |
| Negative |
41 |
37 |
| Missing | 8 | 22 |
HER2, human epidermal growth factor receptor 2; IDC, invasive ductal carcinoma; ILC, invasive lobular carcinoma.