Table 1. Baseline Demographic Characteristics of Patients With T1 N0 M0 Triple-Negative Breast Cancer.
| Characteristic | Total | Stage | P value | ||
|---|---|---|---|---|---|
| T1a | T1b | T1c | |||
| Overall No. | 7739 | 755 | 1979 | 5005 | |
| Age, y | |||||
| <35 | 173 | 9 (1.2) | 25 (1.3) | 139 (2.8) | .002 |
| 35-50 | 1523 | 116 (15.4) | 303 (15.3) | 1104 (22.1) | |
| 50-70 | 4328 | 439 (58.1) | 1179 (59.6) | 2710 (54.1) | |
| ≥70 | 1715 | 191 (25.3) | 472 (23.9) | 1052 (21) | |
| Race/ethnicity | |||||
| Non-Hispanic White | 4997 | 505 (66.9) | 1332 (67.3) | 3160 (63.1) | <.001 |
| Non-Hispanic Black | 1377 | 113 (15) | 346 (17.5) | 918 (18.3) | |
| Non-Hispanic other races | 569 | 65 (8.6) | 131 (6.6) | 373 (7.5) | |
| Hispanic (all races) | 796 | 72 (9.5) | 170 (8.6) | 554 (11.1) | |
| Marital status | |||||
| Married | 4790 | 476 (63) | 1251 (63.2) | 3063 (61.2) | .33 |
| Single | 1064 | 104 (13.8) | 248 (12.5) | 712 (14.2) | |
| Divorced, separated, or widowed | 1885 | 175 (23.2) | 480 (24.3) | 1230 (24.6) | |
| Grade | |||||
| G1 | 276 | 59 (7.8) | 99 (5) | 118 (2.4) | <.001 |
| G2 | 1775 | 287 (38) | 559 (28.2) | 929 (18.6) | |
| G3 | 5644 | 405 (53.6) | 1317 (66.5) | 3922 (78.4) | |
| G4 | 44 | 4 (0.5) | 4 (0.2) | 36 (0.7) | |
| Surgery | |||||
| Breast conserving | 5372 | 497 (65.8) | 1453 (73.4) | 3422 (68.4) | <.001 |
| Radical | 463 | 56 (7.4) | 96 (4.9) | 311 (6.2) | |
| Simple | 1798 | 191 (25.3) | 407 (20.6) | 1200 (24) | |
| Other | 106 | 11 (1.5) | 23 (1.2) | 72 (1.4) | |
| Adjuvant therapy | |||||
| None | 1286 | 237 (31.4) | 316 (16) | 733 (14.6) | <.001 |
| Chemotherapy | 2202 | 82 (10.9) | 462 (23.3) | 1658 (33.1) | |
| Radiotherapy | 1278 | 329 (43.6) | 459 (23.2) | 490 (9.8) | |
| Both | 2973 | 107 (14.2) | 742 (37.5) | 2124 (42.4) | |
| Vital status | |||||
| Alive | 7278 | 732 (97.0) | 1894 (95.7) | 4652 (92.9) | <.001 |
| Deceased | 461 | 23 (3.0) | 85 (4.3) | 353 (7.1) | |
| Cause of death | |||||
| Non–breast cancer | 7469 | 746 (98.8) | 1932 (97.6) | 4791 (95.7) | <.001 |
| Breast cancer | 270 | 9 (1.2) | 47 (2.4) | 214 (4.3) | |