Table 1.
Primary tumour characteristics (N = 54)
| Characteristics | N | % |
|---|---|---|
| Primary tumour size | ||
| T1–2 | 32 | 61.5 |
| T3-T4 | 20 | 38.5 |
| NA | 2 | |
| Primary tumour histological type | ||
| IC-NST | 29 | 55.8 |
| Mixed with lobular componenta or ILC | 23 | 44.2 |
| NA | 2 | |
| Nodal status | ||
| N0 | 14 | 26.9 |
| N+ | 38 | 73.1 |
| NA | 2 | |
| Histological grade | ||
| Grade I–II | 39 | 75.0 |
| Grade III | 13 | 25.0 |
| NA | 2 | |
| IHC profile | ||
| HR+/HER2− | 33 | 68.7 |
| HER2+ | 7 | 14.6 |
| HR−/HER2− | 8 | 16.7 |
| NAb | 6 | |
NA not available, IHC immunohistochemistry, HR hormone receptors, IC-NST invasive carcinoma of no special type, ILC invasive lobular carcinoma
aIn mixed ductal–lobular carcinoma, the lobular component constitutes ≥ 50% of the tumour
bThese 6 cases were diagnosed before 2000 and have missing HER2+ status