Table 1. Clinicopathological characteristics.
| No. | % | |
|---|---|---|
| Gender (Male) | 126 | 57 |
| Tumor site | ||
| Floor of the mouth | 103 | 47 |
| Oral tongue | 94 | 42 |
| Other subsitesa | 25 | 11 |
| UICC Stageb | ||
| I | 111 | 50 |
| II | 48 | 22 |
| III | 44 | 20 |
| IVa | 19 | 8 |
| Tumor invasive depth | ||
| <4mm | 114 | 52 |
| >4mm | 105 | 48 |
| Differentiation grade | ||
| High | 57 | 15 |
| Moderate | 128 | 59 |
| Poor | 32 | 26 |
| Tumor invasive front | ||
| Cohesive | 83 | 40 |
| Non-cohesive | 123 | 60 |
| Perineural invasion | ||
| Yes | 61 | 29 |
| No | 150 | 71 |
| Metastasesc | ||
| N- | 147 | 66 |
| N+ | 75 | 34 |
| Smokingd | ||
| High | 144 | 78 |
| Low | 40 | 22 |
a: This category includes other oral subsites such as buccal mucosa and retromolar trigone.
b: The UICC stage after primary surgical treatment and pathological examination.
Abbreviation: UICC, Union for International Cancer Control.
c: Both the patients diagnosed with lymph node metastases from the primary surgical treatment and patients with isolated lymph node recurrences were considered N+.
d: Tobacco consumption was defined as high if the patient reported a history of >10 pack-years and as low if it was ≤ 10 pack-years.