23 Even in NPC patients treated with IMRT, the primary tumor volume is still highly significant in evaluating local control, distant metastasis, and OS. 24 , 25 The histological-type World Health Organization type I patients frequently seen among the Caucasian population were found to be associated with adverse prognosis. 26 EBV plays an important role in the etiology of NPC, and viral status has prognostic implications.
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