Table 1. Demographic and clinical characteristics of patients.
| Patient characteristics | N=421 (%) |
|---|---|
| Age, years | |
| Median | 45 |
| Range | 18-65 |
| ≤45y | 215 (51.1) |
| >45y | 206 (48.9) |
| Gender | |
| Male | 322 (76.5) |
| Female | 99 (23.5) |
| Histology | |
| WHO type II | 20 (4.8) |
| WHO type III | 401 (95.2) |
| T stage a | |
| T1 | 8 (1.9) |
| T2 | 139 (33.0) |
| T3 | 184 (43.7) |
| T4 | 90 (21.4) |
| N stage a | |
| N0 | 77 (18.3) |
| N1 | 156 (37.1) |
| N2 | 137 (32.5) |
| N3 | 51 (12.1) |
| Stage a | |
| III | 284 (67.5) |
| IVa-b | 137 (32.5) |
| EBV DNA | |
| <4000 copies/ml | 235 (55.8) |
| ≥4000 copies/ml | 186 (44.2) |
| Treatment | |
| CCRT | 191 (45.4) |
| IC+CCRT | 121 (28.7) |
| CCRT+AC | 109 (25.9) |
| RT technique | |
| 2D-CRT | 323 (76.7) |
| 3D-CRT | 14 (3.3) |
| IMRT | 84 (20.0) |
| Follow-up time (months) | |
| Median | 62.0 |
| Range | 5-125 |
a 2002 American Joint Committee on Cancer/International Union Against Cancer staging system.
Abbreviation: CCRT, Concurrent Chemoradiotherapy; IC, Induction Chemotherapy; AC, Adjuvant Chemotherapy; RT, Radiotherapy; 2D-CRT, Conventional Two-Dimensional Radiotherapy; 3D-CRT, Three-Dimensional Conformal Radiotherapy; IMRT, Intensity-Modulated Radiotherapy.