| Factors | P + V+ | P-V- | P1 | P + V - | P2 | P-V+ | P3 |
---|---|---|---|---|---|---|---|---|
Gender | Male | 35 | 13 | 0.476 | 16 | 0.716 | 14 | 0.847 |
 | Female | 17 | 4 |  | 5 |  | 5 |  |
Age | >60Â years | 23 | 11 | 0.047 | 13 | 0.859 | 11 | 0.676 |
 | ≤60 years | 29 | 6 |  | 8 |  | 8 |  |
Histology | SQC | 28 | 6 | 0.184 | 6 | 0.539 | 5 | 0.559 |
 | ADC | 24 | 11 |  | 15 |  | 14 |  |
Tumor size | >5Â cm | 24 | 3 | 0.037 | 5 | 0.950 | 6 | 0.563 |
 | ≤5 cm | 28 | 14 |  | 16 |  | 13 |  |
differentiation | WD, MD | 35 | 17 | 0.017 | 17 | 0.757 | 12 | 0.027 |
 | PD | 17 | 0 |  | 4 |  | 7 |  |
TNM stage | I-IIa | 12 | 8 | 0.113 | 10 | 0.973 | 8 | 0.765 |
 | IIb-III | 40 | 9 |  | 11 |  | 11 |  |
Nodal status | Positive | 29 | 3 | 0.006 | 5 | 0.471 | 7 | 0.362 |
 | Negative | 23 | 14 |  | 14 |  | 12 |  |