Table 1.
Comparison of basic information between SD and SED group in matched cohort.
| SD | SED | P | |
|---|---|---|---|
| 162 | 81 | ||
| Sex (%) | |||
| Female | 76 (46.9) | 40 (49.4) | 0.820 |
| Male | 86 (53.1) | 41 (50.6) | |
| Age (%) | |||
| ≤60 | 71 (43.8) | 36 (44.4) | >0.999 |
| >60 | 91 (56.2) | 45 (55.6) | |
| Tumor size (%) | |||
| <=4 | 108 (66.7) | 59 (72.8) | 0.406 |
| >4 | 54 (33.3) | 22 (27.2) | |
| P stage (%) | |||
| I/IIa | 54 (33.3) | 22 (27.2) | 0.406 |
| IIb/III | 108 (66.7) | 59 (72.8) | |
| Positive LN ratio (%) | |||
| ≤0.02 | 76 (46.9) | 35 (43.2) | 0.682 |
| >0.02 | 86 (53.1) | 46 (56.8) | |
| Soft tissue invasion (%) | |||
| Negative | 36 (22.2) | 18 (22.2) | >0.999 |
| Positive | 126 (77.8) | 63 (77.8) | |
| Vessel invasion (%) | |||
| Negative | 137 (84.6) | 69 (85.2) | >0.999 |
| Positive | 25 (15.4) | 12 (14.8) | |
| Differentiation (%) | |||
| Poor | 30 (18.5) | 16 (19.8) | 0.954 |
| Well | 132 (81.5) | 65 (80.2) | |
| CA19-9 (%) | |||
| ≤172.8 U/ml | 74 (45.7) | 40 (49.4) | 0.683 |
| >172.8 U/ml | 88 (54.3) | 41 (50.6) | |
| CEA (%) | |||
| ≤3.54 ng/ml | 85 (52.5) | 41 (50.6) | 0.892 |
| >3.54 ng/ml | 77 (47.5) | 40 (49.4) | |
| Nerve invasion (%) | |||
| Negative | 42 (25.9) | 21 (25.9) | >0.999 |
| Positive | 120 (74.1) | 60 (74.1) | |
| IPNI (%) | |||
| iPNI (-) | 67 (41.4) | 35 (43.2) | 0.890 |
| iPNI (+) | 95 (58.6) | 46 (56.8) | |
| Postoperative chemotherapy (%) | |||
| No | 46 (28.4) | 23 (28.4) | >0.999 |
| Yes | 116 (71.6) | 58 (71.6) | |
| Curability (%) | |||
| R0 | 94 (58.0) | 47 (58.0) | >0.999 |
| R1 | 68 (42.0) | 34 (42.0) | |
CA19-9, carbohydrate antigen 19-9; CEA, carcinoembryonic antigen; iPNI, imaging Perineural Invasion; LN, lymph node; SD, Standard Dissection; SED, Selective Extended dissection.