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DFS= Disease Free Survival. EBV DNA was stratified into 4 groups: Neg, Negative (EBV DNA = 0); UQ, Positive but UnQuantifiable (0 < EBV DNA < 102 copies/mL); Q, Positive and quantifiable (102 ≤ EBV DNA ≤ 15 × 102 copies/mL); Q+, Strongly positive and quantifiable (EBV DNA > 15 × 102 copies/mL).
