Table 1.
Patient and tumor characteristics
| Bilateral RT | Unilateral RT | ||
|---|---|---|---|
| (n = 38) | (n = 34) | p value | |
| Primary site | |||
| Oral cavity | 10 | 13 | 0.556 |
| Oropharynx | 12 | 8 | |
| Hypopharynx | 10 | 9 | |
| Larynx | 5 | 2 | |
| Others | 1 | 2 | |
| T-classification | |||
| T1 | 4 | 4 | 0.673 |
| T2 | 13 | 11 | |
| T3 | 5 | 4 | |
| T4 | 8 | 4 | |
| Rec | 8 | 11 | |
| rT0 | 6 | 8 | |
| rT1 | 0 | 0 | |
| rT2 | 2 | 2 | |
| rT3 | 0 | 0 | |
| rT4 | 0 | 1 | |
| N-classification | |||
| N0 | 0 | 2 | 0.124 |
| N1 | 0 | 0 | |
| N2a | 3 | 2 | |
| N2b | 18 | 17 | |
| N2c | 8 | 1 | |
| N3 | 1 | 1 | |
| Rec | 8 | 11 | |
| rN1 | 1 | 1 | |
| rN2 | 7 | 10 | |
| rN3 | 0 | 0 | |
| Stage | |||
| III | 1 | 1 | 0.637 |
| IVA | 28 | 20 | |
| IVB | 1 | 2 | |
| Rec | 8 | 11 | |
| rIII | 1 | 1 | |
| rIVA | 7 | 10 | |
| Bilateral neck LN metastasis | |||
| Yes | 9 | 1 | 0.011* |
| No | 29 | 33 | |
| Necrosis in LN | |||
| Yes | 21 | 21 | 0.401 |
| No | 14 | 9 | |
| Unknown | 3 | 4 | |
| Maximum diameter of LN (cm) | |||
| Median | 2.5 | 2.7 | 0.783 |
| Range | 0.4–7.5 | 0.8–4.1 | |
| Number of LN metastasis | |||
| 0–1 | 6 | 13 | 0.031* |
| ≥ 2 | 32 | 21 | |
| Sex | |||
| Male | 32 | 26 | 0.217 |
| Female | 6 | 8 | |
| Age | |||
| Median | 63 | 63 | 0.270 |
| Range | 38–80 | 34–84 | |
RT radiation therapy, Rec recurrence, LN lymph node. *A P value of ≤0.05 was considered statistically significant