Figure 3. Distant metastasis-free survival (DMFS) for low-, intermediate-, and high-risk groups for all NPC patients (n = 719).

Using pairwise comparisons, the DMFS of the intermediate- and high-risk groups were significantly poorer than the low-risk group (P = 0.008, P < 0.001; respectively) and the DMFS of intermediate-risk group was significantly better than the high-risk group (P = 0.001).