Table 5. Impact of prognostic factors on treatment results by multivariate analysis (p value).
| Items | 5y-LFFS | 5y-RFFS | 5y-DFFS | 5y-OS |
|---|---|---|---|---|
| Gender | ||||
| Male vs. Female | .452 | .794 | .419 | .424 |
| Age | ||||
| ≥50 y vs. <50y | .892 | .842 | .525 | .007 |
| Involvement of cranial nerves | ||||
| NO vs. YES | .330 | .200 | .939 | .183 |
| N classification | ||||
| N0–1 vs. N2–3 | .751 | .196 | .306 | .597 |
| Metastasis to (RLN) | ||||
| NO vs. YES | .105 | .483 | .691 | .644 |
| Concurrent chemoradiotherapy | ||||
| NO vs. YES | .669 | .086 | .875 | .974 |
| Boost | ||||
| NO vs. YES | .355 | .656 | .847 | .403 |
| Volume of GTVnx | ||||
| >50 ml vs. ≤50ml | .018 | .974 | .894 | .296 |
Abbreviations: RLN, retropharyngeal lymph nodes; GTVnx, gross tumor volume of the nasopharynx; LFFS, local failure-free survival; RFFS, regional failure-free survival; DFFS, distant failure-free survival; OS, overall survival.