This study aimed to judge the prognostic value of plasma EpsteinCBarr Virus DNA (EBV DNA) for local and regionally advanced nasopharyngeal carcinoma (NPC) patients treated with concurrent chemoradiotherapy in intensity-modulated radiotherapy (IMRT) era. (IVa-b vs III), buy Laninamivir smoking status (yes vs no), family history of NPC (yes vs no), EBV DNA (4000?copies/mL vs