Fig. 2From: Subdivision of de-novo metastatic nasopharyngeal carcinoma based on tumor burden and pretreatment EBV DNA for therapeutic guidance of locoregional radiotherapyKaplan–Meier survival curves for the factors that may influence survival outcomes in the training cohort. Radiotherapy (a), Epstein-Barr virus DNA copies (b), numbers of metastatic lesions (c), numbers of metastatic organs (d)Back to article page