S2.
Clinicopathological characteristics of total TNBC patients (N=75)
| Characteristics | n (%) |
| TNBC, triple-negative breast cancer. | |
| Age at diagnosis (year) | |
| ≤45 | 28 (37.3) |
| >45 | 47 (62.7) |
| Unknown | 0 |
| Histology of primary tumor | |
| Ductal | 70 (94.6) |
| Lobular | 1 (1.4) |
| Others | 3 (4.1) |
| Unknown | 1 |
| Initial tumor grade | |
| I | 1 (2.1) |
| II | 28 (58.3) |
| III | 19 (39.6) |
| Unknown | 27 |
| Initial TNM stage | |
| I | 6 (9.1) |
| II | 24 (36.4) |
| III | 28 (42.4) |
| IV | 8 (12.1) |
| Unknown | 9 |
| Family history | |
| Yes | 8 (10.7) |
| No | 67 (89.3) |
| Unknown | 0 |
| Sites of metastases at inclusion | |
| Chest | 20 (26.7) |
| Lymph node | 49 (65.3) |
| Bone | 27 (36.0) |
| Lung | 27 (36.0) |
| Liver | 21 (28.0) |
| Brain | 9 (12.0) |
| Unknown | 0 |
| Therapeutic status at inclusion | |
| First-line | 50 (66.7) |
| Second-line | 15 (20.0) |
| Third-line and beyond | 4 (5.3) |
| Stage IV at initial diagnosis | 6 (8.0) |