Table 1.
Basic demographic data for 1401 evaluable breast cancer cases
| Mean tumor size (mm) | 30.7 | |
| Mean age at diagnosis (years) | 63.5 | |
| Tumor size | Number (n) | Percent (%) |
| pT1 | 385 | 27.5 |
| pT2 | 737 | 52.6 |
| pT3 | 107 | 7.6 |
| pT4 | 172 | 12.3 |
| Lymph node involvement | ||
| pN0 | 725 | 51.8 |
| pN1 | 539 | 38.6 |
| pN2 | 134 | 9.6 |
| Tumor grade | ||
| 1 | 323 | 23.0 |
| 2 | 576 | 41.1 |
| 3 | 502 | 35.9 |
| Histologic subtype | ||
| Invasive ductal | 992 | 70.9 |
| Invasive lobular | 203 | 14.5 |
| Mucinous | 38 | 2.7 |
| Apocrine | 17 | 1.2 |
| Cribriform | 41 | 2.9 |
| Papillary | 19 | 1.4 |
| Medullary | 45 | 3.2 |
| Other | 44 | 3.2 |
| Intrinsic subtype | ||
|
Luminal A (ER+ and/or PR+, HER2−, Ki-67 < 14%) |
217 | 15.6 |
|
Luminal B (HER2-negative) ER+ and/or PR+, HER2−, Ki-67 ≥14%) |
683 | 49.0 |
|
Luminal B (HER2-positive) (ER+ and/or PR+, HER2+) |
156 | 11.2 |
| HER2 type (ER− or PR−, HER2+) | 111 | 7.9 |
| Basal-like (ER−, PR−, HER2−) | 227 | 16.3 |