Table 1.
Demographic features of study cohort
| Case number (n=612)/average | Percentage/range | |
|---|---|---|
| Age(range)(year) | 58.5(2695) | 2695 |
| Specimen | ||
| Biopsy | 395 | 64.5% |
| Resection | 217 | 35.5% |
| Histologic type | ||
| IDC | 496 | 81.0% |
| ILC | 65 | 10.6% |
| Mixed IDC/ILC | 25 | 4.1% |
| Metaplastic carcinoma | 7 | 1.1% |
| Metastatic carcinoma | 19 | 3.1% |
| ER | ||
| Positive | 380 | 62.1% |
| Negative | 141 | 23.0% |
| Not available | 91 | 14.9% |
| PR | ||
| Positive | 317 | 51.8% |
| Negative | 204 | 33.3% |
| Not available | 91 | 14.9% |
| HER2 IHC | ||
| Negative(0/1+) | 432 | 70.6% |
| Equivocal(2+) | 101 | 16.5% |
| Positive(3+) | 79 | 12.9% |
IDC: Invasive ductal carcinoma, ILC: Invasive lobular carcinoma, HER2: Human epidermal growth factor receptor 2, ER: Estrogen receptor, PR: Progesterone receptor, IHC: Immunohistochemistry