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Comparison of OS of patients in the LRRT and non-LRRT group (a) Low-risk patients (patients with undetectable EBV DNA level and satisfactory tumor response post-PCT) (b) High-risk patients (patients with detectable EBV DNA level or/and unsatisfactory tumor response post-PCT) (c) Landmark analyses of overall survival for long-term survivors of ≥1 year in low risk group (d) Landmark analyses of overall survival for long-term survivors of ≥1 year in high risk group
