Table 2. Univariate analysis of b-EBV DNA and its influencing factors.
| Characteristics | EBV DNA(median)a | P valueb |
|---|---|---|
| Gender | ||
| M | 545 | 0.094 |
| F | 577 | |
| ECOG Performance Status | ||
| 0-1 | 549.5 | 0.112 |
| 2 | 6820 | |
| Treatment | ||
| ICT followed by CTRT | 885 | 0.006 |
| CTRT | 179 | |
| Neck surgeryc | ||
| YES | 835 | 0.083 |
| NO | 226.5 | |
| T classification | ||
| 1-2-3 | 387 | 0.002 |
| 4 | 1745 | |
| N classification | ||
| 0-1-2 | 453 | 0.048 |
| 3a-3b | 2153 | |
| Recurrence | ||
| YES | 4609 | 0.034 |
| NO | 480 |
a Excluded from this analysis the Unquantifiable EBV DNA group (N=5).
b Continuous variable (age) was assessed using Spearman's correlation; categorical variables were assessed using non-parametric Mann-Whitney test. Statistically significant P values (P<0.05) are highlighted.
c Lymph node neck dissection or excisional biopsy.