Supplementary Table 2.
Baseline characteristics of de novo stage IV triple-negative breast cancer patients by the number of metastatic sites.
| Features | Level | 1 site (%) | >1 site (%) | P-value |
|---|---|---|---|---|
| Age (years) | <65 | 691 (58.7) | 459 (64.6) | 0.012 |
| ≥65 | 486 (41.3) | 252 (35.4) | ||
|
| ||||
| Race | White | 795 (67.5) | 490 (68.9) | 0.824 |
| Black | 305 (25.9) | 176 (24.8) | ||
| Others | 77 (6.5) | 45 (6.3) | ||
|
| ||||
| Grade | G1/G2 | 177 (15.0) | 110 (15.5) | 0.968 |
| G3/G4 | 815 (69.2) | 490 (68.9) | ||
| Unknown | 185 (15.7) | 111 (15.6) | ||
|
| ||||
| Tumor size (cm) | ≤2 | 168 (14.3) | 99 (13.9) | 0.565 |
| 2–5 | 399 (33.9) | 226 (31.8) | ||
| >5 | 425 (36.1) | 258 (36.3) | ||
| Unknown | 185 (15.7) | 128 (18.0) | ||
|
| ||||
| Node stage | Node negative | 295 (25.1) | 147 (20.7) | 0.020 |
| Node positive | 809 (68.7) | 502 (70.6) | ||
| Unknown | 73 (6.2) | 62 (8.7) | ||
|
| ||||
| Surgery of the primary | Yes | 521 (44.3) | 160 (22.5) | <0.001 |
| No | 656 (55.7) | 551 (77.5) | ||
|
| ||||
| Chemotherapy | Yes | 843 (71.6) | 514 (72.3) | 0.754 |
| No/unknown | 334 (28.4) | 197 (27.7) | ||
|
| ||||
| Insurance | Yes | 1118 (95.0) | 665 (93.5) | 0.402 |
| No | 48 (4.1) | 38 (5.3) | ||
| Unknown | 11 (0.9) | 8 (1.1) | ||
|
| ||||
| Marital status | Married | 512 (43.5) | 292 (41.1) | 0.556 |
| Unmarried | 609 (51.7) | 386 (54.3) | ||
| Unknown | 56 (4.8) | 33 (4.6) | ||