Table 1.
Patient characteristics
| E5194 (n = 327) | Ontario cohort (n = 446) | |
|---|---|---|
| Age at diagnosis | ||
| Median (10th–90th percentile) | 61 (45–77) | 62 (45–79) |
| < 50 years | 66 (20.2%) | 92 (20.6%) |
| ≥ 50 years | 261 (79.8%) | 354 (79.4%) |
| Tumor size | ||
| ≤ 1 cm | 260 (79.5%) | 181 (40.6%) |
| > 1–2.5 cm | 67 (20.5%) | 238 (53.4%) |
| > 2.5 cm | 0 | 27 (6.1%) |
| Nuclear grade | ||
| Low | 29 (8.9%) | 50 (11.2%) |
| Intermediate | 187 (57.2%) | 267 (59.9%) |
| High | 111 (33.9%) | 129 (28.9%) |
| DCIS score median (10th–90th percentile) | 25 (8–58) | 30 (5–63) |
| DCIS score risk group | ||
| Low risk | 230 (70.3%) | 288 (64.6%) |
| Intermediate risk | 53 (16.2%) | 72 (16.1%) |
| High risk | 44 (13.5%) | 86 (19.3%) |
| Year of diagnosis | ||
| 1994–1999 | 147 (45.0%) | 255 (57.2%) |
| 2000 or later | 180 (55.0%) | 191 (42.8%) |