Table 1.
Patient and tumor characteristics by ER status
| ER− (N = 4,202) | ER+ (N = 5,242) | All patients (N = 9,444)
|
|||
|---|---|---|---|---|---|
| N (%) | N (%) | N | % | Pa | |
| Age at diagnosis | |||||
| <40 | 894 (21.3) | 497 (9.5) | 1,381 | 14.6 | <0.001 |
| 40–49 | 1,526 (36.3) | 1,455 (27.8) | 2,981 | 31.6 | |
| 50–59 | 1,141 (27.2) | 1,554 (29.6) | 2,695 | 28.5 | |
| ≥60 | 651 (15.5) | 1,736 (33.1) | 2,387 | 25.3 | |
| Menopausal status | |||||
| Pre/peri-menopausal | 2,286 (54.4) | 1,964 (37.5) | 4,250 | 45.0 | <0.001 |
| Post-menopausal | 1,916 (45.6) | 3,278 (62.5) | 5,194 | 55.0 | |
| Tumor size | |||||
| ≤2.0 cm | 2,299 (54.7) | 3,308 (63.1) | 5,607 | 59.4 | <0.001 |
| 2.1–4.0 cm | 1,609 (38.3) | 1,710 (32.6) | 3,319 | 35.1 | |
| ≥4.1 cm | 294 (7.0) | 224 (4.3) | 518 | 5.5 | |
| Tumor progesterone receptors (fmol/mg) | |||||
| 0–9 | 3,264 (77.7) | 937 (17.9) | 4,201 | 44.5 | <0.001 |
| 10–49 | 458 (10.9) | 493 (9.4) | 951 | 10.1 | |
| ≥50 | 480 (11.4) | 3,812 (72.7) | 4,292 | 45.4 | |
a
Comparison of frequency distributions by ER status