Table 1.
Patient characteristics
| Variable | Sub group | 2b sparing | Control | P value |
|---|---|---|---|---|
| Gender | Male | 10 | 18 | 0.6 |
| Female | 2 | 2 | ||
| Primary site | Buccal mucosa | 8 | 10 | 0.15 |
| Lower alveolus | 0 | 6 | ||
| tongue | 4 | 4 | ||
| Premalignant lesion | Leukoplakia | 4 | 4 | 0.43 |
| Habits | Tobacco chewing | 8 | 17 | 0.16 |
| Chewing + smoking | 2 | 3 | ||
| Clinical T stage | cT2 | 9 | 12 | 0.301 |
| cT3 | 2 | 2 | ||
| cT4 | 0 | 5 | ||
| cTx | 1 | 1 | ||
| TNM stage | I | 1 | 1 | 0.234 |
| II | 8 | 12 | ||
| III | 3 | 2 | ||
| IV | 0 | 5 | ||
| Surgery for primary | WLE | 12 | 20 | |
| Bone resection | Hemi mandibulectomy | 0 | 7 | 0.08 |
| Marginal mandibulectomy | 0 | 1 | ||
| Segmental mandibulectomy | 0 | 2 | ||
| Upper alveolectomy | 1 | 0 | ||
| Reconstruction | Nasolabial | 1 | 4 | 0.5 |
| Sternomastoid | 2 | 2 | ||
| SSG | 3 | 2 | ||
| Neck dissection | I–III | 11 | 19 | |
| I–V | 1 | 1 | ||
| Pathological T | pT1 | 5 | 5 | 0.45 |
| pT2 | 4 | 7 | ||
| pT3 | 1 | 1 | ||
| pT4 | 1 | 6 | ||
| pTx | 1 | 1 | ||
| Margin | Close | 3 | 4 | 0.5 |
| Negative | 6 | 10 | ||
| Positive | 3 | 6 | ||
| Lymphovascular invasion | Present | 2 | 7 | 0.263 |
| Perineural invasion | Present | 0 | 4 | 0.12 |
| Radiotherapy | Yes | 2 | 11 | 0.05 |
| Chemotherapy | Yes | 3 | 3 | 0.6 |
| Recurrences | Yes | 1 | 2 | 0.6 |