Table 1.
Baseline characteristics of the whole cohort in SYSUCC, JMCH, and HNCH.
| Characteristics | Level | SYSUCC | JMCH | HNCH |
|---|---|---|---|---|
| N = 71 | N = 31 | N = 29 | ||
| Age, no. (%) | <65 | 47 (66.2) | 20 (64.5) | 18 (62.1) |
| ≥65 | 24 (33.8) | 11 (35.5) | 11 (37.9) | |
| Sex, no. (%) | Male | 58 (81.7) | 28 (90.3) | 28 (96.6) |
| Female | 13 (18.3) | 3 (9.7) | 1 (3.4) | |
| Smoking history, no. (%) | Never | 18 (25.4) | 5 (16.1) | 6 (20.7) |
| F/C | 53 (74.6) | 26 (83.9) | 23 (79.3) | |
| ICI types, no. (%) | PD-1 | 68 (95.8) | 28 (90.3) | 29 (100.0) |
| PD-L1 | 3 (4.2) | 3 (9.7) | 0 (0.0) | |
| Neoadjuvant treatment cycle, no. (%) | ≤3 | 61 (85.9) | 23 (74.2) | 25 (86.2) |
| >3 | 10 (14.1) | 8 (25.8) | 4 (13.8) | |
| Clinical stage, no. (%) | IB | 4.97 (1.92) | 4.92 (2.02) | 4.21 (1.54) |
| IIA | 3 (4.2) | 2 (6.5) | 1 (3.4) | |
| IIB | 0 (0.0) | 1 (3.2) | 2 (6.9) | |
| IIIA | 37 (52.1) | 15 (48.4) | 19 (65.5) | |
| Clinical N stage, no. (%) | N0 | 31 (43.7) | 13 (41.9) | 7 (24.1) |
| N1 | 41 (57.7) | 19 (61.3) | 15 (51.7) | |
| Radiology exam types, no. (%) | CT | 30 (42.3) | 12 (38.7) | 14 (48.3) |
| PET/CT | 57 (80.3) | 21 (67.7) | 21 (72.4) | |
| Tumor histology, no. (%) | LUSC | 14 (19.7) | 10 (32.3) | 8 (27.6) |
| Non-LUSC | 23 (32.4) | 14 (45.2) | 11 (37.9) | |
| Adjuvant treatment status, no. (%) | No | 48 (67.6) | 17 (54.8) | 18 (62.1) |
| Yes | 47 (66.2) | 20 (64.5) | 18 (62.1) |
SYSUCC, Sun Yat-sen University Cancer Center; JMCH, Jiangmen Central Hospital; HNCH, Henan Cancer Hospital; ICI, immune checkpoint inhibitor; PD-1, programmed death-1; PD-L1, programmed death-L1; CT, computed tomography; PET, positron emission tomography; LUSC, lung squamous cell carcinoma; F/C, former/current.