Tumor Pathologic Characteristics
| Pathologic characteristic | HER2+ | HER2− | P |
| Histology | n = 26 | n = 61 | |
| Intestinal | 21 (81%) | 31 (57%) | 0.11 |
| Diffuse | 5 (24%) | 19 (36%) | |
| Medullary | 0 | 4 (8%) | |
| Differentiation | n = 30 | n = 61 | |
| Well | 0 | 1 (2%) | |
| Moderately | 16 (53%) | 17 (27%) | |
| Poorly | 14 (47%) | 43 (68%) | 0.06 |
| Lymph node metastases | n = 10 | n = 30 | |
| Yes | 6 (60%) | 12 (40%) | 0.26 |
| No | 4 (40%) | 18 (60%) |