Table 1

Incidence of serum/plasma EBV DNA during various NPC management stages

DiagnosisStatusSamplePositiveTotal (case)%
NPCBefore treatmentSerum/plasma9816758.7
Serum8314656.9
Plasma152171.4
Known positive EBV DNA in serumSerum treated with DNAase142458.3
During radiotherapyPlasma (before Rx, 1, 2, 3–6 wks)a(9, 6, 3, 1)13(69, 46, 23, 7)
Follow-upPlasma3378.1
Recurrence or partial responsePlasma3560
Complete remissionPlasma0320
Normal controlSerum107713.0
  • a (before Rx, 1, 2, 3–6 wks) incidence of plasma EBV DNA before treatment at first, second, and third to sixth weeks during radiotherapy.