Table 1. Distribution and characteristics of 2,629 patients with nasopharyngeal carcinoma.
| Characteristic | TNM 6th edition | TNM 7th edition | ||||
| N | % | N | % | ?2 | P | |
| Gender | ||||||
| Female | 673 | 25.6 | 673 | 25.6 | ||
| Male | 1,956 | 74.4 | 1,956 | 74.4 | ||
| Age (year) | ||||||
| Median | 50 | 50 | ||||
| Range | 6–98 | 6–98 | ||||
| Histology | ||||||
| WHO I+II | 142 | 5.4 | 142 | 5.4 | ||
| WHO III | 2,487 | 94.6 | 2,487 | 94.6 | ||
| Treatment | ||||||
| RT | 673 | 25.6 | 673 | 25.6 | ||
| CRT | 1,956 | 74.4 | 1,956 | 74.4 | ||
| Radiotherapy techniques | ||||||
| 2D-CRT | 1,863 | 70.9 | 1,863 | 70.9 | ||
| 3D-CRT | 85 | 3.2 | 85 | 3.2 | ||
| IMRT | 681 | 25.9 | 681 | 25.9 | ||
| T-classification | 3.467 | 0.325 | ||||
| T1 | 292 | 11.1 | 329 | 12.5 | ||
| T2 | 561 | 21.3 | 524 | 19.9 | ||
| T3 | 1,247 | 47.5 | 1,247 | 47.5 | ||
| T4 | 529 | 20.1 | 529 | 20.1 | ||
| N-classification | 20.589 | <0.001 | ||||
| N0 | 670 | 25.5 | 551 | 21 | ||
| N1 | 728 | 27.7 | 847 | 32.2 | ||
| N2 | 1,042 | 39.6 | 1,042 | 39.6 | ||
| N3 | 189 | 7.2 | 189 | 7.2 | ||
| M-classification | ||||||
| M0 | 2,553 | 97.1 | 2,553 | 97.1 | ||
| M1 | 76 | 2.9 | 76 | 2.9 | ||
| Overall Stage | 0.22 | 0.999 | ||||
| I | 118 | 4.5 | 120 | 4.6 | ||
| II | 389 | 14.8 | 387 | 14.7 | ||
| III | 1,400 | 53.3 | 1,400 | 53.2 | ||
| IV | 722 | 27.5 | 722 | 27.5 | ||
Abbreviations: AJCC = American Joint Committee on Cancer; WHO = World Health Organization; RT = Radiotherapy; CRT = Chemoradiotherapy; 2D-CRT = conventional 2-dimensional radiotherapy; 3D-CRT = 3-dimensional conformal radiotherapy; IMRT = Intensity-modulated radiation therapy