Table 3.
Distribution of breast tumor characteristics among sporadic breast cancer cases
| Tumor characteristics | Sporadic breast cancer cases N (%) | |
|---|---|---|
| Histologic type | ||
| Ductal | 444 (84.9) | |
| Lobular | 62 (11.9) | |
| Special-type | 17 (3.2) | |
| Missing | 7 | |
| Tumor size | ||
| ≤ 20 mm | 349 (67.2) | |
| 21-50 mm | 152 (29.3) | |
| > 50 mm | 18 (3.5) | |
| Missing | 11 | |
| Histopathologic grade | ||
| 1 | 89 (17.1) | |
| 2 | 227 (43.6) | |
| 3 | 205 (39.3) | |
| Missing | 9 | |
| Tubular formation | ||
| 1 | 33 (6.3) | |
| 2 | 143 (27.5) | |
| 3 | 344 (66.2) | |
| Missing | 10 | |
| Nuclear atypia | ||
| 1 | 16(3.1) | |
| 2 | 267(51.3) | |
| 3 | 237(45.6) | |
| Missing | 10 | |
| Mitotic index | ||
| 1 | 219(42.3) | |
| 2 | 141(27.2) | |
| 3 | 158(30.5) | |
| Missing | 12 | |
| Vascular invasion | ||
| No | 403(79.3) | |
| Yes | 105(20.7) | |
| Missing | 22 | |
| Lymph node involvement | ||
| No | 288(57.5) | |
| Yes | 213(42.5) | |
| Missing | 29 | |
| HR status | ||
| ER-PR- | 83(15.7) | |
| ER + and/or PR+ | 444(84.3) | |
| Missing | 3 | |
| HER2 status | ||
| HER2- | 449(87.7) | |
| HER2+ | 63(12.3) | |
| Missing | 18 |