Table I.
Tumor characteristics in 48 breast cancer cases scoring 1+ by immunohistochemistry for HER2 expression.
| Tumor characteristics | IDC histotype | ILC histotype | Total (n) | % |
|---|---|---|---|---|
| Histological grade (G3) | 19 | 3 | 22 | 46 |
| Peritumoral vascular invasion | 23 | 4 | 27 | 56 |
| Lymph node-positive | 27 | 5 | 32 | 78 |
| Ki-67 >30% | 22 | 1 | 23 | 48 |
| ER-negative | 3 | 0 | 3 | 6 |
| PgR-negative | 10 | 0 | 10 | 21 |
HER2, human epidermal growth factor receptor 2; ER, estrogen receptor; PgR, progesterone receptor; IDC, infiltrating ductal carcinoma; ILC, infiltrating lobular carcinoma.