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Distant metastasis-free survival stratified by the pretreatment Epstein–Barr virus (EBV) DNA level and nodal features. (A) Pretreatment EBV DNA level. (B) Cervical regions of lymph nodes metastasis. (C) Bilaterality of retropharyngeal lymph nodes' metastasis. (D) Nodal grouping. (E) Bilaterality of central nodal necrosis. (F) Extracapsular spread. (G) Bilaterality of cervical lymph nodes metastasis. (H) Nodal size >6 cm.
