|  | MTUS1 (cases) |  | |
---|---|---|---|---|
characteristics | Â | low | High | P-value* |
Gender | Male | 10 | 8 | P = 0.426 |
 | Female | 15 | 16 |  |
Age (years) | ≤46 | 11 | 15 | P = 0.156 |
 | >46 | 14 | 9 |  |
Tumor stage | T1 | 0 | 4 | P = 0.01 |
 | T2 | 15 | 12 |  |
 | T3 | 6 | 0 |  |
 | T4 | 4 | 8 |  |
Lymph node metastasis | Negative (pN−) | 22 | 21 | P = 0.957 |
 | Positive (pN+) | 3 | 3 |  |
clinic stage | C1 | 0 | 4 | P = 0.000 |
 | C2 | 14 | 10 |  |
 | C3 | 5 | 2 |  |
 | C4 | 6 | 8 |  |
Histological grading | I | 8 | 15 | P = 0.017 |
 | II | 3 | 5 |  |
 | III | 14 | 4 |  |
distant metastasis | Negtive | 17 | 24 | P = 0.005 |
 | positive | 8 | 0 |  |
Recurrence | Negtive | 16 | 22 | P = 0.022 |
 | positive | 9 | 2 |  |
Tumor site | Parotid | 7 | 15 | Â |
 | Submandibular | 15 | 8 | P = 0.02 |
 | sublingual | 3 | 1 |  |
Vital status | Alive | 20 | 21 | P = 0.048 |
 | Death (tumor-related) | 5 | 3 |  |