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 |