Table 1.
Demographic and clinical characteristics of patients with NPC in the training cohort and validation cohort.
| Characteristic | Training cohort | Validation cohort |
|---|---|---|
| Gender | ||
| Male | 243 (68.8) | 106 (70.2) |
| Female | 110 (31.2) | 45 (29.8) |
| Age (years) | ||
| Mean | 49.22 | 47.59 |
| Range | 9–85 | 10–80 |
| Smoking | ||
| Yes | 126 (35.7) | 55 (36.4) |
| No | 227 (64.3) | 96 (63.6) |
| T stage | ||
| T1 | 20 (5.7) | 6 (4.0) |
| T2 | 58 (16.4) | 28 (18.5) |
| T3 | 172 (48.7) | 76 (50.3) |
| T4 | 103 (29.2) | 41 (27.2) |
| N stage | ||
| N0 | 11 (3.1) | 2 (1.3) |
| N1 | 38 (10.8) | 16 (10.6) |
| N2 | 223 (63.2) | 101 (66.9) |
| N3 | 81 (22.9) | 32 (21.2) |
| M stage | ||
| M0 | 326 (92.4) | 136 (90.1) |
| M1 | 27 (7.6) | 15 (9.9) |
| Clinical stage | ||
| I | 1 | 1 |
| II | 11 | 4 |
| III | 168 | 75 |
| IVa | 146 | 56 |
| IVb | 27 | 15 |
| Pathological type | ||
| NKDC | 127 | 47 |
| NKUC | 224 | 103 |
| Other | 2 | 1 |
| Induced chemotherapy | ||
| Yes | 310 | 136 |
| No | 43 | 15 |
| Concurrent chemoradiotherapy | ||
| Yes | 323 | 141 |
| No | 30 | 10 |
| Follow-up time (months) | ||
| Median | 34.8 | 38.4 |
| Range | 0.3–101.7 | 0.3–101.2 |
All data except age in the above table are numbers of patients, with percentages in parentheses. No difference was found between the training cohort and the validation cohort in either the clinical characteristics or recurrence status (p = 0.176–0.829).
NKDC, non-keratinizing differentiated carcinoma; NKUC, non-keratinizing undifferentiated carcinoma; Other, adenocarcinoma or small cell carcinoma.