Fig. 2

Survival curves of 749 patients with NPC who were treated with IMRT. The current 7th edition of the Union for International Cancer Control/American Joint Committee on Cancer (UICC/AJCC) staging system was used for staging. a The 5-year local relapse-free survival (LRFS) rates for patients with stage T1-T4 NPC were 98.4, 96.2, 93.0, and 90.5%, respectively. b The 5-year distant metastasis-free survival (DMFS) rates for patients with stage N0-N3b NPC were 93.3, 84.2, 72.4, 61.9, and 50.7%, respectively. c the 5-year overall survival (OS) rates for patients with stage I-IVb NPC were 97.4, 93.8, 81.8, 69.7, and 54.0%, respectively