Table 1. Clinicopathological features.
| N | % | |
|---|---|---|
|
Age (years) | ||
| ⩽40 | 157 | 12.7 |
| 41–50 | 273 | 22.1 |
| 51–65 | 531 | 43 |
| 66–75 | 210 | 17 |
| >75 | 64 | 5.2 |
|
Clinical tumour size (cT) | ||
| T0 | 213 | 17.3 |
| T1 | 675 | 54.7 |
| T2 | 310 | 25.1 |
| T3 | 36 | 2.9 |
| Unknown | 3 | |
|
Pathological tumour size (mm) | ||
| 0–5 | 76 | 6.2 |
| 5.1–10 | 190 | 15.4 |
| 10.1–20 | 549 | 44.6 |
| 20.1–30 | 243 | 19.8 |
| >30 | 172 | 14 |
|
Pathological subtype | ||
| Ductal | 1051 | 85 |
| Lobular | 58 | 4.7 |
| Mixed | 5 | 0.4 |
| Medullary | 42 | 3.4 |
| Others | 81 | 6.5 |
|
Tumour grade | ||
| 1 | 95 | 7.7 |
| 2 | 291 | 23.5 |
| 3 | 822 | 66.5 |
| Unknown | 29 | 2.3 |
|
LVI | ||
| No | 848 | 68.6 |
| Yes | 277 | 22.4 |
| Unknown | 112 | 9 |
|
Pathological ALN status | ||
| pN0 | 951 | 77.2 |
| pN0(i+) | 35 | 2.8 |
| pN1mic | 55 | 4.5 |
| pN1 | 191 | 15.5 |
|
Metastatic evolution | ||
| No | 1089 | 88 |
| Yes | 148 | 12 |
|
Breast surgical resection | ||
| Conservative | 613 | 81 |
| Mastectomy | 144 | 19 |
|
SLN biopsy | ||
| No | 348 | 28.1 |
| Yes | 889 | 71.9 |
|
ALN dissection | ||
| No | 648 | 52.4 |
| Yes | 588 | 47.6 |
|
Adjuvant chemotherapy | ||
| No | 288 | 23.3 |
| Yes | 949 | 76.7 |
Abbreviations: ALN=axillary lymph node; LVI=lymphovascular invasion; N=number of patients; pN=pathological lymph onde involvement; SLN=sentinel lymph node.