Research Article
Overall Survival Analyses following Adjuvant Chemotherapy or Nonadjuvant Chemotherapy in Patients with Stage IB Non-Small-Cell Lung Cancer
Table 1
Baseline characteristics of the study population.
| | | Nonadjuvant chemotherapy (n = 14578) | Adjuvant chemotherapy (n = 2187) | value |
| | Gender | | | 0.099 | | Male | 6961 (47.8%) | 1003 (45.9%) | | | Female | 7617 (52.2%) | 1184 (54.1%) | |
| | Age | | | <0.001 | | <60 | 2090 (14.3%) | 564 (25.8%) | | | 61–75 | 7489 (51.4%) | 1322 (60.4%) | | | ≥75 | 4999 (34.3%) | 301 (13.8%) | |
| | Race | | | 0.533 | | White | 12372 (84.9%) | 1836 (84.0%) | | | Black | 1184 (8.1%) | 187 (8.6%) | | | Others | 1022 (7.0%) | 164 (7.4%) | |
| | Marital status | | | <0.001 | | Divorced | 1649 (11.3%) | 266 (12.2%) | | | Married | 8193 (56.2%) | 1328 (60.7%) | | | Others | 4736 (32.5%) | 593 (27.1%) | |
| | Laterality | | | 0.005 | | Left | 6059 (41.6%) | 840 (38.4%) | | | Right | 8519 (58.4%) | 1347 (61.6%) | |
| | Grade | | | <0.001 | | Well/moderate | 8729 (59.9%) | 1132 (51.8%) | | | Poor/undifferentiated | 4919 (33.7%) | 935 (42.7%) | | | Unknown | 930 (6.4%) | 120 (5.5%) | |
| | Pathological subtype | | | <0.001 | | Adenocarcinoma | 6103 (41.9%) | 1027 (47.0%) | | | Squamous cell carcinoma | 3581 (24.5%) | 411 (18.8%) | | | Others | 4894 (33.6%) | 749 (34.2%) | |
| | Visceral pleural invasion | | | 0.452 | | No | 5869 (40.3%) | 862 (39.4%) | | | Yes | 8709 (59.7%) | 1325 (60.6%) | |
| | Tumor size (mm) | | | 0.002 | | ≤20 | 3494 (24.0%) | 470 (21.5%) | | | 21–30 | 3355 (23.0%) | 472 (21.6%) | | | 31–40 | 7729 (53.0%) | 1245 (56.9%) | |
| | Surgical procedure | | | 0.005 | | Lobectomy | 11723 (80.4%) | 1814 (82.9%) | | | Segmentectomy | 2855 (19.6%) | 373 (17.1%) | |
| | No. of resected lymph nodes | | | | 0.938 | | 0 | 1442 (9.9%) | 214 (9.8%) | | | 1–3 | 2541 (17.4%) | 370 (16.9%) | | | ≥4 | 9877 (67.7%) | 1495 (68.4%) | | | Unknown | 718 (4.9%) | 108 (4.9%) | |
|
|
