Table 1. Characteristics of patients who underwent upfront surgery for N2 disease.
| Characteristics | n (%) |
|---|---|
| Age | 66.5 [35–80] |
| Sex | |
| Male | 69 (73.4) |
| Female | 25 (26.6) |
| Smoking | |
| Smoker | 76 (80.8) |
| Non-smoker | 18 (19.1) |
| Smoking index | 855 [0–2,850] |
| CEA (ng/mL) | 4.0 (0.3–182) |
| Lung disease | |
| Intestinal pneumonia | 12 (12.8) |
| Emphysema | 19 (20.2) |
| Tumor diameter | 32 [10–100] |
| Lymph node diameter | 13 [5–30] |
| SUV max on PET | |
| Tumor | 9.6 (2–22.5) |
| Lymph node | 3.9 (1.7–16.8) |
| Tumor location | |
| RUL | 39 (41.5) |
| RML | 2 (2.1) |
| RML | 17 (18.3) |
| LUL (upper segment) | 25 (26.6) |
| LUL (lingular segment) | 4 (4.3) |
| LLL | 7 (7.4) |
| cT | |
| cT1a | 9 (9.6) |
| cT1b | 21 (22.3) |
| cT2a | 40 (42.6) |
| cT2b | 13 (13.8) |
| cT3 | 9 (9.6) |
| cT4 | 2 (2.1) |
| Histology | |
| Ad | 65 (69.1) |
| Non-ad | 29 (30.9) |
| Clinical N2 station | |
| Single | 83 (88.3) |
| Multiple | 11 (11.7) |
| c-skip N2 | |
| Without N1 | 50 (53.2) |
| With N1 | 44 (46.8) |
| Preoperative proven pathological N2 | |
| + | 2 (2.1) |
| − | 92 (97.9) |
SUV max on PET, standardized uptake value on positron emission tomography; RUL, right upper lobe; RML, right middle lobe; RLL, right lower lobe; LUL, left upper lobe; LLL, left lower lobe; c-skip N2, clinical N2 disease without N1.