Table 3.
Comparison of outcomes in DCIS, DCIS-MI, T1a, and T1b.24
| Characteristic | DCIS | DCIS-MI | T1a | T1b |
|---|---|---|---|---|
| N = 161,394 | N = 13,489 | N = 153,856 | N = 196,656 | |
| Tumor grade | ||||
| I | 17,752 (14.3%) | 2058 (23.9%) | 56,020 (39.8%) | 42,991 (23.7%) |
| II | 51,118 (41.2%) | 3291 (38.2%) | 60,911 (43.3%) | 84,409 (46.5%) |
| III/IV | 55,327 (44.5%) | 3269 (37.9%) | 23,769 (16.9%) | 54,009 (29.8%) |
| Unknown | 37,197 | 4871 | 13,156 | 15,247 |
| Radiation | ||||
| No | 88,601 (56.0%) | 7439 (56.2%) | 63,232 (41.9%) | 90,384 (47.1%) |
| Yes | 69,570 (44.0%) | 5799 (43.8%) | 87,513 (58.1%) | 101,449 (52.9%) |
| Unknown | 3223 | 251 | 3111 | 4823 |
| Outcome | ||||
| BC death | 1837 (3.8%) | 323 (6.9%) | 3661 (6.8%) | 9792 (12.1%) |
DCIS, ductal carcinoma in situ; DCIS-MI, DCIS with microinvasion; T1a, tumor diameter greater than 1 mm but less than 10 mm; T1b, tumor diameter greater than 10 mm but less than 20 mm; BC, breast cancer.