Table 2. Tumor characteristic (n=1,712).
| Tumor characteristic | No. (%) |
|---|---|
| Ductal carcinoma | 1,484 (86.7) |
| Differentiation | |
| Poor | 108 (7.3) |
| Moderate | 723 (48.7) |
| Well | 546 (36.8) |
| Unknown | 107 (7.2) |
| Lobular carcinoma | 89 (5.2) |
| Mixed carcinoma | 34 (2.0) |
| Medullary carcinoma | 9 (0.5) |
| Mucinous carcinoma | 13 (0.8) |
| Tubular carcinoma | 35 (2.0) |
| Other | 48 (2.8) |
| Hormone receptors | |
| ER+ and PR+ | 894 (52.2) |
| ER- and PR- | 553 (32.3) |
| ER+ and PR- | 52 (3.0) |
| ER- and PR+ | 200 (11.7) |
| Unknown | 13 (0.8) |
| HER2 | |
| Negative | 1,111 (64.9) |
| Positive | 574 (33.5) |
| Unknown | 27 (1.6) |
| AJCC stage | |
| I | 156 (9.1) |
| IIA | 559 (32.7) |
| IIB | 450 (26.3) |
| IIIA | 347 (20.3) |
| IIIB | 17 (1.0) |
| IIIC | 175 (10.2) |
| IV | 1 (0.1) |
| Not determined | 7 (0.4) |
ER=estrogen receptor; PR=progesterone receptor; HER2=human epidermal growth factor receptor 2; AJCC=American Joint Committee on Cancer.