Figure 1.

Kaplan-Meier estimate of overall survival according to (A) pretreatment EBV DNA concentration (≤ 5,000 versus > 5,000 copies/mL), (B) number of organ metastases (single versus multiple sites), and (C) single versus multiple organ metastasis and subsite analysis of single organ sites (lung, bone or liver). (D) Box plot of pretreatment EBV DNA concentrations in NPC patients with metastases, including single organ metastasis of lung, bone and liver, and multiple organ metastases. The EBV DNA concentration was expressed as a natural log scale.