Table 1. Demographic information for patients with stage IV NSCLC before PSM.
| All patients (n=30,342) | Surgery to primary site (n=2,436), n (%) | Non-surgery to primary site (n=27,906), n (%) | P | |
|---|---|---|---|---|
| Age | <0.001 | |||
| Mean | 66.67 | 63.97 | 66.90 | |
| SD | 11.48 | 10.88 | 11.15 | |
| Gender | <0.001 | |||
| Male | 16,976 | 1,261 (51.77) | 15,715 (56.31) | |
| Female | 13,366 | 1,175 (48.23) | 12,191 (43.69) | |
| Race | <0.001 | |||
| White | 23,814 | 1,995 (81.90) | 21,819 (78.19) | |
| Black | 4,077 | 268 (11.00) | 3,809 (13.65) | |
| Other | 2,451 | 173 (7.10) | 2,278 (8.16) | |
| T stage | <0.001 | |||
| T1 | 6,309 | 1,006 (41.30) | 5,303 (19.00) | |
| T2 | 7,908 | 610 (25.04) | 7,298 (26.15) | |
| T3 | 6,189 | 380 (15.60) | 5,809 (20.82) | |
| T4 | 9,936 | 440 (18.06) | 9,496 (34.03) | |
| N stage | <0.001 | |||
| N0 | 7,622 | 1,168 (47.95) | 6,454 (23.13) | |
| N1 | 2,788 | 383 (15.72) | 2,405 (8.62) | |
| N2 | 14,616 | 765 (31.40) | 13,851 (49.63) | |
| N3 | 5,316 | 120 (4.93) | 5,196 (18.62) | |
| M stage | <0.001 | |||
| M1a | 6,662 | 774 (31.77) | 5,888 (21.10) | |
| M1b | 23,680 | 1,662 (68.23) | 22,018 (78.90) | |
| Tumor position | <0.001 | |||
| Right bronchus | 897 | 44 (1.81) | 853 (3.06) | |
| Right upper lobe | 4,951 | 452 (18.56) | 4,499 (16.12) | |
| Right middle lobe | 10,134 | 749 (30.75) | 9,385 (33.63) | |
| Right lower lobe | 1,375 | 133 (5.46) | 1,242 (4.45) | |
| Left bronchus | 623 | 24 (0.99) | 599 (2.15) | |
| Left upper lobe | 8,113 | 650 (26.68) | 7,463 (26.74) | |
| Left lower lobe | 3,831 | 321 (13.18) | 3,510 (12.58) | |
| Over lapping lesion | 418 | 63 (2.59) | 355 (1.27) | |
| Histology | <0.001 | |||
| Large cell | 1,333 | 115 (4.72) | 1,218 (4.36) | |
| Adenocarcinoma | 18,573 | 1,649 (67.69) | 16,924 (60.65) | |
| Squamous cell | 9,130 | 560 (22.99) | 8,570 (30.71) | |
| Adeno-squamous | 517 | 80 (3.28) | 437 (1.57) | |
| Neuroendocrine | 789 | 32 (1.31) | 757 (2.71) | |
| Grade | <0.001 | |||
| I | 1,789 | 195 (8.00) | 1,594 (5.71) | |
| II | 9,184 | 904 (37.11) | 8,280 (29.67) | |
| III | 18,164 | 1,240 (50.90) | 16,924 (60.65) | |
| IV | 1,205 | 97 (3.98) | 1,108 (3.97) | |
| Radiation | <0.001 | |||
| Yes | 15,450 | 1,087 (44.62) | 14,363 (51.47) | |
| None/unknown | 14,892 | 1,349 (55.38) | 13,543 (48.53) | |
| Chemotherapy | 0.910 | |||
| Yes | 16,832 | 1,354 (55.58) | 15,478 (55.46) | |
| None/unknown | 13,510 | 1,082 (44.42) | 12,428 (44.54) | |
| Surgery to other sites | <0.001 | |||
| Yes | 1,574 | 374 (15.35) | 1,200 (4.30) | |
| None/unknown | 28,768 | 2,062 (84.65) | 26,706 (95.70) |
NSCLC, non-small cell lung cancer; PSM, propensity score matching; SD, standard deviation.