Table 1.
Comparison of clinicopathological characteristics between segmentectomy and wedge resection groups before propensity score matching.
| Total n=570 | Segmentectomy (n=326) | Wedge resection (n=244) | p valuea) |
|---|---|---|---|
| Median age (IQR), y | 69 (62-74) | 72 (66-78) | <0.001b) |
| Male, No. (%) | 167 (51.2) | 139 (57.0) | 0.176 |
| Smoking history (+), No. (%) | 175 (53.7) | 143 (58.6) | 0.268 |
| Right side, No. (%) | 147 (45.1) | 128 (52.5) | 0.090 |
| CT Tumor size (IQR), cm | 1.4 (1.2-1.7) | 1.4 (1.2-1.7) | 0.263b) |
| Tumor disappearance rate (IQR), % | 30.5 (5-70) | 33.5 (5-70) | 0.622b) |
| CTR, No. (%) 26-50 51-99 100 |
88 (27.0) 90 (27.6) 148 (45.4) |
58 (23.8) 69 (28.3) 117 (48.0) |
0.679 |
| PET maxSUV value (IQR) | 1.22 (0.56-2.43) | 1.12 (0-2.68) | 0.462b) |
| CEA elevation, No. (%) | 52 (16.0) | 50 (20.5) | 0.185 |
| Clinical stage IA2≤. No. (%) | 167 (51.2) | 126 (51.6) | 0.933 |
| Ly (+), No. (%) | 34 (10.4) | 30 (12.3) | 0.505 |
| V (+), No. (%) | 46 (14.1) | 46 (18.9) | 0.136 |
| Pleural invasion, No. (%) | 22 (6.7) | 35 (14.3) | 0.004 |
| Pulmonary metastasis, No. (%) | 4 (1.2) | 4 (1.6) | 0.730 |
| Adenocarcinoma, No. (%) | 282 (86.5) | 196 (80.3) | 0.051 |
| Pathological T1c≤, No. (%) | 43 (13.2) | 51 (20.9) | 0.017 |
| Pathological stage IA3≤. No. (%) | 50 (15.3) | 51 (20.9) | 0.096 |
| Recurrence, No. (%) | 18 (5.5) | 41 (16.8) | <0.001 |
| Intrathoracic only, No. (%) | 17 (5.2) | 32 (13.1) | 0.001 |
| Lung | 10 (3.1) | 15 (6.1) | 0.097 |
| Lymph node | 6 (1.8) | 8 (3.3) | 0.288 |
| Surgical margin | 0 | 5 (2.0) | 0.014 |
| Pleura | 4 (1.2) | 8 (3.3) | 0.138 |
| Extrathoracic (and/or intrathoracic), No. (%) | 1 (0.3) | 9 (3.7) | 0.003 |
a) Fisher’s exact test, b) Mann-Whitney U test.
CEA, carcinoembryonic antigen; CT, computed tomography; CTR, consolidation tumor ratio; IQR, interquartile range; Ly, lymphatic vessel invasion; maxSUV, maximum standardized uptake values; PET, positron emission tomography; V, blood vessel invasion.