Table 2 Univariate analysis of clinicopathological characteristics and incidence of distant metastasis.
Variables | Incidence of distant metastasis (%) | p value |
|---|---|---|
Sex | Â | 0.081 |
Male | 27/573 (5.1) | |
Female | 9/354 (2.5) | |
Primary site | Â | 0.003* |
PIOC of the mandible | 4/16 (25.0) | |
Others | 32/871 (3.7) | |
Histological differentiation |  | < 0.001* |
Well/Moderately | 26/824 (3.2) | |
Poorly | 10/63 (15.9) | |
Initial treatment for primary tumor | Â | 0.202 |
Surgery | 29/775 (3.7) | |
Brachytherapy | 7/112 (6.3) | |
pN |  | < 0.001* |
No | 5/642 (0.8) | |
Yes | 31/245 (12.7) | |
Number of metastatic nodes |  | < 0.001* |
0–3 | 18/821 (2.2) | |
≥ 4 | 18/66 (27.3) | |
Level of metastatic node |  | < 0.001* |
No metastasis or I + II + III | 27/869 (3.1) | |
IV + V | 9/18 (50.0) | |
Contralateral node metastasis |  | < 0.001* |
No | 27/850 (3.2) | |
Yes | 10/38 (26.3) | |
ENE |  | < 0.001* |
No | 11/748 (1.5) | |
Yes | 25/139 (18.0) | |
Postoperative CT and/or RT |  | < 0.001* |
No | 7/732 (1.0) | |
Yes | 29/155 (18.7) | |
Total | 36/887 (4.1) | Â |
