Table 1.
Demographics of all patients with primary metastatic lung cancer.
| Surgery (%) | ||||
|---|---|---|---|---|
| Variables | All | No | Yes | P |
| Age (years) | <0.001 | |||
| ≤ 65 | 25,116 | 24,232 (44.76) | 884 (56.13) | |
| >65 | 30,601 | 29,910 (55.24) | 691 (43.87) | |
| Gender | <0.001 | |||
| Male | 30,775 | 29,974 (55.36) | 801 (50.86) | |
| Female | 24,942 | 24,168 (44.64) | 774 (49.14) | |
| Histology | <0.001 | |||
| Adenocarcinoma | 32,684 | 31,742 (58.63) | 942 (59.81) | |
| Squamous | 10,248 | 9,989 (18.45) | 259 (16.44) | |
| Others | 12,785 | 12,411 (22.92) | 374 (23.75) | |
| Grade | <0.001 | |||
| I | 1,308 | 1,169 (2.16) | 139 (8.83) | |
| II | 6,044 | 5,617 (10.37) | 427 (27.11) | |
| III | 14,841 | 14,201 (26.23) | 640 (40.63) | |
| IV | 785 | 739 (1.36) | 46 (2.92) | |
| Unknown | 32,739 | 32,416 (59.88) | 323 (20.51) | |
| Radiation | 0.017 | |||
| No | 28,402 | 27,552 (50.89) | 850 (53.97) | |
| Yes | 27,315 | 26,590 (49.11) | 725 (40.03) | |
| Chemotherapy | <0.001 | |||
| No | 26,106 | 25,439 (46.99) | 667 (42.35) | |
| Yes | 29,611 | 28,703 (53.01) | 908 (57.65) | |
| T stage | 0.001 | |||
| T1 | 6,602 | 6,376 (11.78) | 226 (14.35) | |
| T2 | 10,148 | 9,840 (18.17) | 308 (19.56) | |
| T3 | 14,199 | 13,791 (25.47) | 408 (25.90) | |
| T4 | 24,768 | 24,135 (44.58) | 633 (40.19) | |
| N stage | <0.001 | |||
| N0 | 12,420 | 11,721 (21.65) | 699 (44.38) | |
| N1 | 4,478 | 4,280 (7.91) | 198 (12.57) | |
| N2 | 24,891 | 24,396 (45.06) | 495 (31.43) | |
| N3 | 11,428 | 11,294 (20.86) | 134 (8.51) | |
| Nx | 2,500 | 2,451 (4.52) | 49 (3.11) | |
| Metastasis site | <0.001 | |||
| Bone | 11,863 | 11,622 (21.47) | 241 (15.30) | |
| Brain | 8,886 | 8,436 (15.58) | 450 (28.57) | |
| Liver | 3,467 | 3,387 (6.26) | 80 (5.08) | |
| Lung | 10,717 | 10,177 (18.79) | 540 (34.29) | |
| Multiple-site | 20,784 | 20,520 (37.90) | 264 (16.76) | |