|  | No. of patients (%) | P value (OS) | P value (DFS) |
---|---|---|---|---|
Age | > 60 | 68 (56.7) | 0.506 | 0.849 |
 | ≤ 60 | 52 (43.3) |  |  |
Sex | M | 89 (74.2) | 0.321 | 0.443 |
 | F | 31 (25.8) |  |  |
T stage | T1/T2 | 53 (44.2) | 0.679 | 0.645 |
 | T3/T4 | 67 (55.8) |  |  |
N stage | N0 | 77 (64.2) | 0.223 | 0.005 |
 | N1 | 43 (35.8) |  |  |
Stage | I | 40 (33.3) | 0.902 | 0.129 |
 | II/III | 80 (66.7) |  |  |
Resection margin | Negative | 79 (65.8) | 0.811 | 0.700 |
 | Positive | 41 (34.2) |  |  |
CA 19-9 | ≤ 60 U/ml | 57 (47.5) | 0.048 | 0.011 |
 | > 60 U/mL | 62 (51.7) |  |  |
Tumor location | Proximal | 59 (49.2) | 0.207 | 0.224 |
 | Distal | 55 (45.8) |  |  |
Histologic grade | WD/MD | 107 (89.2) | 0.065 | 0.029 |
 | PD | 11 (9.2) |  |  |
Angiolymphatic invasion | Yes | 38 (31.7) | 0.789 | 0.576 |
 | No | 62 (51.7) |  |  |
Perineural invasion | Yes | 87 (72.5) | 0.419 | 0.098 |
 | No | 24 (24.0) |  |  |
Adjuvant treatment | CCRT | 30 (25.0) | 0.004 | 0.038 |
 | CCRT + AC | 90 (75.0) |  |  |