Table 3 Log-rank analysis of locoregional control
n | 3-year locoregional control | p-value | |
|---|---|---|---|
Disease | |||
Primary | 38 | 80.3% | p = 0.2 |
Recurrent | 13 | 61.5% | |
Number of pathological LN metastases | |||
0 | 23 | 90.2% | p < 0.05 |
≥ 1 | 28 | 63.4% | |
≤ 1 | 36 | 82.1% | p = 0.1 |
≥ 2 | 15 | 59.3% | |
Treatment machine | |||
EXL-15SP | 43 | 75.8% | p = 0.7 |
Clinac iX | 8 | 75.0% | |
Total dose | |||
< 30 Gy | 20 | 77.9% | p = 0.9 |
≥ 30 Gy | 31 | 73.2% | |
Radiation field | |||
Unilateral neck | 12 | 75.0% | p = 1.0 |
Whole neck | 39 | 75.4% | |
Neck dissection | |||
None/Ipsilateral | 35 | 81.7% | p = 0.1 |
Bilateral | 16 | 61.4% | |
Pathological response based on the Oboshi Shimosato classification | |||
≥ Grade 3 | 21 | 100% | p < 0.001 |
≤ Grade 2 | 30 | 56.6% | |