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| Biologic marker | No. of patients (%) |
|---|---|
| ER | |
| Negative | 2,557 (24.5) |
| Positive | 7,828 (74.9) |
| Unknown | 64 (0.6) |
| Total | 10,449 (100.0) |
| PR | |
| Negative | 3,624 (34.8) |
| Positive | 6,739 (64.6) |
| Unknown | 65 (0.6) |
| Total | 10,428 (100.0) |
| c-erbB-2 | |
| Negative | 3,351 (32.7) |
| Weak (1+) | 2,602 (25.4) |
| Intermediate (2+) | 2,046 (19.9) |
| Strong (3+) | 1,864 (18.2) |
| Unknown | 394 (3.8) |
| Total | 10,257 (100.0) |
KBCS=Korean Breast Cancer Society; ER=estrogen receptor; PR=progesterone receptor.
