Table 2.
Demographic and clinical characteristics of breast cancer patients in compendium of microarray datasets*
| Characteristics | All patients, %† | Untreated node-negative patients, %‡ |
| ER status | ||
| Negative | 25 | 30 |
| Positive | 58 | 65 |
| Missing | 17 | 5 |
| PGR status | ||
| Negative | 19 | 3 |
| Positive | 24 | 10 |
| Missing | 57 | 88 |
| HER2 status | ||
| Negative | 17 | 5 |
| Positive | 7 | 1 |
| Missing | 76 | 94 |
| Histological grade | ||
| Low | 10 | 14 |
| Intermediate | 25 | 32 |
| High | 30 | 36 |
| Missing | 36 | 18 |
| Tumor size, cm | ||
| ≤2 | 30 | 63 |
| >2 | 30 | 29 |
| Missing | 40 | 8 |
| Nodal status | ||
| Negative | 44 | 100 |
| Positive | 30 | 0 |
| Missing | 26 | 0 |
| Age at diagnosis, y | ||
| ≤50 | 28 | 42 |
| >50 | 43 | 44 |
| Missing | 29 | 14 |
*
Patients described in Table 1; ER = estrogen receptor; PGR = progesterone receptor.
†
Refers to the whole set of microarray data (n = 5715 patients).
‡
Refers to the subset of patients having a node-negative tumor and who were not treated by systemic adjuvant therapy (n = 1260).