Table 2.
Characteristics of patients who underwent neck dissection (clinically N0 neck/clinically N1 neck).
| Type of neck dissection | Clinically N0 neck (110) | Clinically N1 neck (68) | ||||
|---|---|---|---|---|---|---|
| SMND (77) | MRND (33) | P value | SMND (32) | RND (36) | P value | |
| Primary tumor site | 0.825 | |||||
| Tongue | 28 (36.4%) | 13 (39.4%) | 0.923 | 14 (43.8%) | 13 (36.1%) | |
| Lower gum | 31 (40.3%) | 13 (39.4%) | 11 (34.4%) | 14 (38.9%) | ||
| Upper gum | 7 (9.1%) | 3 (9.1%) | 3 (9.4%) | 4 (11.1%) | ||
| Buccal mucosa | 6 (7.8%) | 3 (9.1%) | 1 (3.1%) | 3 (8.3%) | ||
| Oral floor | 2 (2.6%) | 1 (3.0%) | 3 (9.4%) | 2 (5.6%) | ||
| Others | 3 (3.9%) | 0 (0.0%) | 0 (0.0%) | 0 (0.0%) | ||
| Clinical tumor stage | ||||||
| cT1/2 | 55 (71.4%) | 23 (69.7%) | 0.513 | 10 (31.3%) | 9 (25.0%) | 0.381 |
| cT3/4 | 22 (28.6%) | 10 (30.3%) | 22 (68.7%) | 27 (75.0%) | ||
| Tumor differentiation | ||||||
| Poorly differentiated | 5 (6.5%) | 2 (6.1%) | 0.982 | 2 (6.3%) | 2 (5.6%) | 0.991 |
| Moderately differentiated | 22 (28.6%) | 10 (30.3%) | 9 (28.1%) | 10 (27.8%) | ||
| Well differentiated | 50 (64.9%) | 21 (63.6%) | 21 (65.6%) | 24 (66.7%) | ||
| Mode of invasion | ||||||
| Grade 1–3 | 58 (75.3%) | 23 (69.7%) | 0.348 | 22 (68.8%) | 23 (63.9%) | 0.435 |
| Grade 4 | 19 (24.7%) | 10 (30.3%) | 10 (31.2%) | 13 (36.1%) | ||
| Neoadjuvant chemoradiotherapy | 26 (33.8%) | 12 (36.4%) | 0.479 | 19 (59.4%) | 19 (52.8%) | 0.325 |
| Pathological nodal stage | 0.603 | |||||
| pN0 | 72 (93.5%) | 29 (87.9%) | 5 (15.6%) | 6 (16.7%) | 0.828 | |
| pN1 | 4 (5.2%) | 3 (9.1%) | 24 (75.0%) | 25 (69.4%) | ||
| pN2b | 1 (1.3%) | 1 (3.0%) | 3 (9.4%) | 5 (13.9%) | ||
| Extracapsular spread | 1 (1.3%) | 2 (6.1%) | 0.214 | 3 (9.4%) | 4 (11.1%) | 0.567 |
| Adjuvant chemoradiotherapy | 5 (6.5%) | 4 (12.1%) | 0.264 | 2 (6.3%) | 4 (11.1%) | 0.395 |
SMND: selective submandibular neck dissection; RND: radical neck dissection; MRND: modified radical neck dissection.