Research Article
Survival Outcome and Impact of Chemotherapy in T1 Node-Negative Triple-Negative Breast Cancer: A SEER Database Analysis
Table 1
Patient characteristics of the study population.
| | | Original dataset | Matched dataset | | Chemotherapy (n = 2760)(%) | No chemotherapy or unknown (n = 1805)(%) | | Chemotherapy (n = 1607)(%) | No chemotherapy or unknown (n = 1607)(%) | |
| | Age (years) | | | <0.001 | | | 1.000 | | ≤50 | 1022 (37.0) | 271 (15.0) | | 268 (16.7) | 269 (16.7) | | | >50 | 1738 (63.0) | 1534 (85.0) | | 1339 (83.3) | 1338 (83.3) | | | Race | | | 0.812 | 0.725 | | | | White | 2067 (74.9) | 1351 (74.8) | | 1181 (73.5) | 1174 (73.1) | | | Black | 454 (16.4) | 289 (16.0) | | 281 (17.5) | 275 (17.1) | | | Other/unknown | 239 (8.7) | 165 (9.1) | | 145 (9.0) | 158 (9.8) | | | Year of diagnosis | | | <0.001 | | | 0.872 | | 2010-2011 | 826 (29.9) | 663 (36.7) | | 565 (35.2) | 555 (34.5) | | | 2012-2013 | 980 (35.5) | 621 (34.4) | | 568 (35.3) | 565 (35.2) | | | 2014-2015 | 954 (34.6) | 521 (28.9) | | 474 (29.5) | 487 (30.3) | | | Laterality | | | 0.963 | | | 0.480 | | Left | 1413 (51.2) | 922 (51.1) | | 839 (52.2) | 818 (50.9) | | | Right | 1347 (48.8) | 883 (48.9) | | 768 (47.8) | 789 (49.1) | | | Primary site | | | <0.001 | | | 0.951 | | Nipple/central | 73 (2.6) | 82 (4.5) | | 53 (3.3) | 62 (3.9) | | | UIQ | 472 (17.1) | 261 (14.5) | | 236 (14.7) | 247 (15.4) | | | LIQ | 192 (7.0) | 112 (6.2) | | 112 (7.0) | 109 (6.8) | | | UOQ | 982 (35.6) | 588 (32.6) | | 541 (33.7) | 534 (33.2) | | | LOQ | 214 (7.8) | 135 (7.5) | | 128 (8.0) | 124 (7.7) | | | Other | 827 (30.0) | 627 (34.7) | | 537 (33.4) | 531 (33.0) | | | Histologic subtype | | | <0.001 | | | 0.144 | | Ductal | 2464 (89.3) | 1488 (82.4) | | 1381 (85.9) | 1341 (83.4) | | | Lobular | 16 (0.6) | 21 (1.2) | | 16 (1.0) | 20 (1.2) | | | Other | 280 (10.1) | 296 (16.4) | | 210 (13.1) | 246 (15.3) | | | Grade | | | <0.001 | | | 0.101 | | 1-2 | 548 (19.9) | 671 (37.2) | | 444 (27.7) | 503 (31.3) | | | 3 | 2156 (78.1) | 1078 (59.7) | | 1119 (69.6) | 1054 (65.6) | | | Unknown | 56 (2.0) | 56 (3.1) | | 44 (2.7) | 50 (3.1) | |
|
|
Abbreviations indicate the breast quadrant. UIQ, upper-inner; LIQ, lower-inner; UOQ, upper-outer; LOQ, lower-outer.
|
