Table 3 Oncological data
|  | Overall (n=173) | VR− group (n=132) | VR+ group (n=41) | P-value |
|---|---|---|---|---|
Tumour size (cm), mean | 3.1±1.2 | 2.8±1.0 | 3.5±1.2 | 0.005 |
Lymphovascular invasion (%) | 36 (20.8) | 24 (18.2) | 12 (29.3) | 0.127 |
Perineural invasion (%) | 82 (47.4) | 57 (43.2) | 25 (61) | 0.046 |
Lymph node ratio, mean | 0.14±0.18 | 0.14±0.19 | 0.15±0.14 | 0.795 |
Positive resection margins (%) | 13 (7.5) | 9 (6.8) | 4 (9.8) | 0.533 |
Pathological vessel infiltration (%) | 32 (18.5) | – | 32 (78) |  |
Survival | ||||
 Overall (months), median | 17.7 (0.1–148.6) | 18.4 (0.1–148.6) | 15.4 (0.9–101.7) | 0.717 |
 1 year (%) | 106 (61.3) | 81 (61.4) | 25 (61) | 0.964 |
 3 years (%) | 36 (20.8) | 29 (22) | 7 (17.1) | 0.500 |
 5 years (%) | 23 (13.3) | 19 (14.4) | 4 (9.8) | 0.445 |