Table 3.
Comparison of university vs. non-university institutions
| Characters | University (n) | Non-university (n) | p-value |
|---|---|---|---|
| No. of patients per year (n = 67) | <0.001 | ||
| 0 | 0 | 6 | |
| 1–3 | 2 | 14 | |
| 3–5 | 1 | 12 | |
| 5–10 | 6 | 12 | |
| >10 | 12 | 2 | |
| Use of further molecular pathological diagnostics | 0.020 | ||
| Yes | 16 | 18 | |
| No | 5 | 22 | |
| Radiation technique | |||
| Primary RT for AdCC | 0.069 | ||
| IMRT | 2 | 2 | |
| Rotational IMRT | 5 | 22 | |
| Treatment with protons | 0 | 0 | |
| Treatment with carbon ions | 3 | 1 | |
| Referral to carbon ion/proton therapy center | 11 | 15 | |
| PORT for AdCC | 0.407 | ||
| IMRT | 3 | 3 | |
| Rotational IMRT | 13 | 30 | |
| Treatment with protons | 0 | 0 | |
| Treatment with carbon ions | 1 | 0 | |
| Referral to carbon ion/proton therapy center | 4 | 7 | |
| Primary RT for non-AdCC | 0.133 | ||
| IMRT | 3 | 3 | |
| Rotational IMRT | 13 | 35 | |
| Treatment with protons | 1 | 0 | |
| Treatment with carbon ions | 1 | 0 | |
| Referral to carbon ion/proton therapy center | 3 | 2 | |
| PORT for non-AdCC | 0.381 | ||
| IMRT | 3 | 3 | |
| Rotational IMRT | 16 | 36 | |
| Treatment with protons | 0 | 0 | |
| Treatment with carbon ions | 1 | 0 | |
| Referral to carbon ion/proton therapy center | 1 | 1 | |
| Use of concomitant CTX for PORT | 0.316 | ||
| Yes | 15 | 33 | |
| No | 6 | 7 | |
| Use of concomitant CTX for primary RT | 0.338 | ||
| Yes | 11 | 26 | |
| No | 10 | 14 | |
| Indications for irradiation of nerve tracts up to the base of skull | 0.560 | ||
| Never | 1 | 7 | |
| Parotid gland carcinoma with Pn1 | 6 | 6 | |
| All SGC with Pn1 | 6 | 10 | |
| All AdCC with Pn1 | 3 | 8 | |
| Any AdCC | 5 | 8 | |
RT radiotherapy, PORT postoperative radiotherapy, IMRT intensity-modulated radiotherapy, AdCC adenoid cystic carcinoma, CTX chemotherapy, SGC salivary gland cancer