Table 1 Patients and tumor characteristics in SEER database.
Characteristic | No. of patients (%) | Lymph nodes dissection | |
|---|---|---|---|
N = 154,566 (%) | No, N = 18,482 (%) | Yes, N = 136,084 (%) | |
Age, year | |||
≤ 65 | 57,636 (37.3) | 5,853 (31.7) | 51,783 (38.1) |
> 65 | 96,930 (62.7) | 12,629 (68.3) | 84,301 (61.9) |
Sex | |||
Female | 80,803 (52.3) | 9,707 (52.5) | 71,096 (52.2) |
Male | 73,763 (47.7) | 8,775 (47.5) | 64,988 (47.8) |
Race | |||
White | 131,400 (85) | 16,010 (86.6) | 115,390 (84.8) |
Black | 12,197 (7.9) | 1,522 (8.5) | 10,675 (7.8) |
Asian or Pacific Islander | 10,034 (6.5) | 843 (4.6) | 9,191 (6.8) |
American Indian/Alaska Native | 613 (0.4) | 80 (0.4) | 533 (0.4) |
Unknown | 322 (0.2) | 27 (0.1) | 295 (0.2) |
Histology | |||
SCC | 38,891 (25.2) | 4,651 (25.2) | 34,240 (25.2) |
ADC | 69,790 (45.2) | 7,860 (42.5) | 61,930 (45.5) |
LCLC | 4,129 (2.7) | 518 (2.8) | 3,611 (2.7) |
BAC | 17,875 (11.6) | 2,267 (12.3) | 15,608 (11.5) |
NSCLC (unspecified) | 4,964 (3.2) | 947 (5.1) | 4,017 (3.0) |
Other | 18,917 (12.2) | 2,239 (12.1) | 16,678 (12.3) |
Primary site | |||
Main bronchus | 1,040 (0.7) | 184 (1.0) | 856 (0.6) |
Upper lobe | 90,122 (58.3) | 10,539 (57.0) | 79,583 (58.5) |
Middle lobe | 8,592 (5.6) | 1,236 (6.7) | 7,356 (5.4) |
Lower lobe | 51,175 (33.1) | 6,062 (32.8) | 45,113 (33.2) |
Overlapping lesion | 1,913 (1.2) | 129 (0.7) | 1,784 (1.3) |
Unknown | 1,724 (1.1) | 332 (1.8) | 1,392 (1.0) |
Position | |||
Left lung | 65,113 (42.1) | 7,728 (41.8) | 57,385 (42.2) |
Right lung | 89,378 (57.8) | 10,732 (58.1) | 78,646 (57.8) |
Bilateral lungs | 14 (0.0) | 6 (0.0) | 8 (0.0) |
Unknown | 61 (0.0) | 16 (0.1) | 45 (0.1) |
T stage | |||
T1 | 81,002 (52.4) | 12,085 (65.4) | 68,917 (50.6) |
T2 | 62,610 (40.5) | 5,258 (28.4) | 57,352 (42.1) |
T3 | 9,381 (6.1) | 946 (5.1) | 8,435 (6.2) |
T4 | 1,573 (1.0) | 193 (1.0) | 1,380 (1.0) |
N stage | |||
N0 | 123,712 (80) | 17,205 (93.1) | 106,507 (78.3) |
N1 | 18,011 (11.7) | 444 (2.4) | 17,567 (12.9) |
N2 | 12,843 (8.3) | 833 (4.5) | 12,010 (8.8) |
Stage | |||
IA | 78,701 (50.9) | 12,639 (68.4) | 66,062 (48.5) |
IB | 35,066 (22.7) | 3,513 (19.0) | 31,553 (23.2) |
IIA | 5,749 (3.7) | 141 (0.8) | 5,608 (4.1) |
IIB | 17,585 (11.4) | 855 (4.6) | 16,730 (12.3) |
IIIA | 17,465 (11.3) | 1,334 (7.2) | 16,131 (11.9) |
Radiotherapy | |||
No | 139,572 (90.3) | 16,325 (88.3) | 123,247 (90.6) |
Yes | 14,994 (9.7) | 2,157 (11.7) | 12,837 (9.4) |
Operation and RT sequence | |||
No radiation | 139,572 (90.3) | 16,325 (88.3) | 123,247 (90.6) |
RT + OP | 2,801 (1.8) | 411 (2.2) | 2,390 (1.8) |
OP + RT | 12,076 (7.8) | 1,711 (9.3) | 10,365 (7.6) |
Intraoperative radiation | 117 (0.1) | 35 (0.2) | 82 (0.1) |
