Table 1.
Clinicopathological characteristics of the patients.
| Variable | n (%) |
|---|---|
| Age (years) | 64.7 (±10.0) |
| Sex | |
| M | 56 (56) |
| F | 44 (42) |
| Adjuvant chemotherapy after PM | |
| Yes | 42 (42) |
| No | 58 (58) |
| Number | |
| Single | 72 (72) |
| Multiple | 28 (28) |
| CEA (ng/ml) | |
| ≥ 5 | 24 (24) |
| < 5 | 76 (76) |
| Operative procedures | |
| Lobectomy/segmentectomy | 24 (24) |
| Wedge resection | 76 (76) |
| Nodal involvement (pathological) | |
| Yes | 2 (2) |
| No | 20 (20) |
| Unknown | 78 (78) |
| Tumor size (pathological) | |
| < 20 mm | 68 (68) |
| ≥ 20 mm | 32 (32) |
| Primary site of CRC | |
| Colon | 50 (50) |
| Rectum | 50 (50) |
| Pathological stage of CRC | |
| I/II | 32 (32) |
| III/IV | 68 (68) |
| Adjuvant chemotherapy after RC | |
| Yes | 56 (56) |
| No | 44 (44) |
| Liver metastasis before PM | |
| Yes | 19 (19) |
| No | 81 (81) |
| Extrapulmonary lesion before PM | |
| Yes | 34 (34) |
| No | 66 (66) |
| DFI (years) | |
| ≥ 3 | 22 (22) |
| < 3 | 78 (78) |
CEA: serum carcinoembryonic antigen level before lung resection, CRC: colorectal cancer, DFI: disease-free interval between definitive treatment of primary CRC and detection of pulmonary metastases, OS: overall survival, PM: pulmonary metastasectomy, RC: resection of colorectal cancer, RFS: relapse-free survival.