Table 1.
Characteristics of included patients
| Characteristic | Number (%) |
|---|---|
| Age (y) | |
| >44 | 163 (47.2) |
| ≤44 | 182 (52.8) |
| Sex | |
| Female | 96 (27.8) |
| Male | 249 (72.2) |
| Pretreatment thyroid volume, cm3 | |
| >16 | 178 (51.6) |
| ≤16 | 167 (48.4) |
| WHO pathologic type | |
| Undifferentiated nonkeratinizing | 343 (99.4) |
| Differentiated nonkeratinizing | 2 (0.6) |
| Tumor classificationa | |
| T1 | 59 (17.1) |
| T2 | 68 (19.7) |
| T3 | 147 (42.6) |
| T4 | 71 (20.6) |
| Node classificationa | |
| N0 | 54 (15.7) |
| N1 | 167 (48.4) |
| N2 | 79 (22.9) |
| N3 | 45 (13.0) |
| Overall stagea | |
| I | 23 (6.7) |
| II | 67 (19.4) |
| III | 150 (43.5) |
| IV | 105 (30.4) |
| Mean radiation dose (Gy) | |
| >47 | 162 (47.0) |
| ≤47 | 183 (53.0) |
| Maximum radiation dose (Gy) | |
| >63 | 155 (44.9) |
| ≤63 | 190 (55.1) |
| Minimum radiation dose (Gy) | |
| >26 | 172 (49.9) |
| ≤26 | 173 (50.1) |
| Chemotherapy | |
| Yes | 293 (84.9) |
| No | 52 (15.1) |
Abbreviation: WHO, World Health Organization.
a
According to the Union for International Cancer Control/American Joint Committee on Cancer criteria (8th version).