immunoglobulin levels and igg and iga antibodies to epstein-barr virus ( ebv ) , viral capsid antigens ( vca ) and early antigens ( ea ) were tested in 67 untreated ( 5 stage i , 32 stage ii , 16 stage iii and 14 stage iv ) , 21 treated and 7 recurrent nasopharyngeal carcinoma ( npc ) patients and 54 normal subjects .
C0003342
viral
C0003320
antigens