Table 1. Patient characteristics.
| Variable | Cases treated with neoadjuvant chemotherapy (%) | |
|---|---|---|
| Age | (mean ± standard deviation) | 44.3 ± 9.5 |
| Clinical tumor size | ≤2cm | 30 (5.1) |
| 2–5cm | 381 (64.1) | |
| >5cm | 183 (30.8) | |
| Clinical nodal metastasis | Negative | 131 (22.1) |
| Positive | 463 (77.9) | |
| Histologic type | Invasive carcinoma of no special type | 516 (86.9) |
| Invasive lobular carcinoma | 19 (3.2) | |
| Micropapillary carcinoma | 31 (5.2) | |
| Mucinous carcinoma | 5 (0.8) | |
| Carcinoma with mucinous differentiation | 9 (1.5) | |
| Metaplastic carcinoma | 13 (2.2) | |
| Tubular carcinoma | 1 (0.2) | |
| Hormone receptor status | Negative | 247 (41.6) |
| Positive | 347 (58.4) | |
| HER2 status | Negative | 431 (72.6) |
| Positive | 163 (27.4) | |
| Histologic grade | 1 | 11 (1.9) |
| 2 | 398 (67.0) | |
| 3 | 185 (31.1) |