Figure 2.

Kaplan–Meier survival curves for overall survival (A), distant metastasis-free survival (B), and locoregional relapse-free survival (C) in different groups: group 1, T3 disease without MRI-detected CN invasion; group 2, T3 disease with MRI-detected CN invasion; group 3, T4 disease. P-values were calculated with the unadjusted log-rank test. Abbreviations: CN=Cranial nerve; MRI=Magnetic resource imaging.