Table 2 Demographics and clinical characteristics of the study group (N = 53)
| Variable | Number | Percentage |
|---|---|---|
| Mean age at diagnosis, 51.9 years | ||
| Median age at diagnosis, 48.5 years | ||
| Standard deviation, 17.3 | ||
| Tumor grade | ||
| I | 3 | 6 |
| II | 23 | 47 |
| III | 19 | 39 |
| Not graded | 4 | 8 |
| Tumor size (cm) | ||
| ≤2 | 8 | 31 |
| 2.1–5 | 11 | 42 |
| >5 | 7 | 27 |
| ER | ||
| Positive | 29 | 59 |
| Negative | 20 | 41 |
| PR | ||
| Positive | 19 | 40 |
| Negative | 29 | 60 |
| HER2 | ||
| Positive (3) | 7 | 14 |
| Negative (0–2) | 42 | 86 |
| Ki-67 | ||
| <14% (low) | 6 | 12 |
| ≥14% (high) | 43 | 88 |
