Table 2. Disease characteristics of the study population.
| Characteristics | Cases (%) |
|---|---|
| Clinic stage (UICC) | |
| 0 | 29 (3.88) |
| 1 | 300 (40.16) |
| 2 | 203 (27.18) |
| 3-4 | 143 (19.14) |
| Unknown | 72 (9.64) |
| Tumor size (cm) | |
| TZ≤2 cm | 583 (78.05) |
| TZ>2 cm | 88 (11.78) |
| Unknown | 76 (10.17) |
| Tumor type | |
| DCIS | 29 (3.88) |
| IDC | 641 (85.81) |
| Others | 66 (8.84) |
| Unknown | 11 (1.47) |
| Bloom-Richardson grade | |
| 1 | 41 (5.49) |
| 2 | 405 (54.22) |
| 3 | 120 (16.06) |
| Unknown | 181 (24.23) |
| LN involvement | |
| Positive | 294 (39.36) |
| Negative | 425 (56.89) |
| Unknown | 28 (37.48) |
| ER status | |
| Positive | 447 (59.84) |
| Negative | 244 (32.66) |
| Unknown | 56 (7.50) |
| PR status | |
| Positive | 372 (49.80) |
| Negative | 319 (42.70) |
| Unknown | 56 (7.50) |
| HER2 status | |
| Positive | 119 (15.93) |
| Negative | 492 (65.86) |
| Unknown | 136 (18.21) |
| P53 status | |
| Positive | 185 (24.77) |
| Negative | 499 (66.80) |
| Unknown | 63 (8.43) |
| Ki67 status | |
| Positive | 428 (57.30) |
| Negative | 258 (34.54) |
| Unknown | 61 (8.17) |
| Intrinsic subtypes | |
| Luminal A | 149 (19.95) |
| Luminal B | 273 (36.55) |
| HER2-positive | 162 (21.69) |
| Triple-negative | 27 (3.61) |
| Unknown | 136 (18.20) |
Note: DCIS: ductal carcinoma in situ, IDC: infiltrating duct carcinoma, LN: lymph node, TZ: tumor size, ER: estrogen receptor, PR: progesterone receptor, HER2: human epidermal growth factor receptor 2.