Table 1.
Patient and treatment characteristics.
| n (%) | T1mi n = 38 (%) | T1a-2 n = 1196 (%) | p value |
|---|---|---|---|
| Age | |||
| <50 | 6 (16) | 299 (25) | 0.25 |
| ≥50 | 32 (84) | 897 (75) | |
| Tumor Grade | |||
| I | 14 (37) | 441 (37) | 0.85 |
| II | 16 (42) | 504 (42) | |
| III | 7 (18) | 231 (19) | |
| Unknown | 1 (3) | 20 (2) | |
| Estrogen receptor | |||
| Positive | 22 (58) | 863 (72) | 0.07 |
| Negative | 13 (34) | 255 (21) | |
| Equivocal | 1 (3) | 57 (5) | |
| Missing | 2 (5) | 21 (2) | |
| Systemic Therapy | |||
| None | 31 (82) | 572 (48) | <0.001 |
| Tamoxifen | 7 (18) | 493 (41) | |
| Chemotherapy | 0 (0) | 131 (11) | |
| Radiation regimen | |||
| Conventional | 21 (55) | 591 (49) | 0.51 |
| Hypofractionated | 17 (45) | 605 (51) | |