Figure 3

(A) Progression-free survival, (B) overall survival, (C) distant metastasis-free survival and (D) regional relapse-free survival curves for patients with NPC stratified by N-category (as defined by the 7th UICC/AJCC system) and parotid lymph node (PLN) involvement. The 11 patients whose involved PLNs were not irradiated were excluded.