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