Table 1.
Selected patient and tumor characteristics
| Characteristic | Parameter |
|---|---|
| Patient number | 40 (80 parotids) |
| Sex (M/F) | 30/10 |
| Age (years) | |
| Mean (range) | 65.5 (46–81) |
| Primary tumor site | |
| Tonsil | 26 (65%) |
| Base of Tongue | 14 (35%) |
| T stage | |
| T1 | 4 (10%) |
| T2 | 11 (27.5%) |
| T3 | 7 (17.5%) |
| T4 | 15 (37.5%) |
| T4a | 3 (7.5%) |
| N stage | |
| N0 | 4 (10%) |
| N1 | 4 (10%) |
| N2a | 2 (5%) |
| N2b | 15 (37.5%) |
| N2c | 14 (35%) |
| N3 | 1 (2.5%) |
| Parotid Radiation Dose | |
| Dmean (Gy) | 35.8 ± 8.9 |
| V30(%) | 53.6 ± 19.9 |
Abbreviations: Dmean Planned mean dose to the parotid gland, V30(%) Percentage of parotid volume receiving a dose ≥30 Gy