CD79A and nasopharyngeal carcinoma: Similarly, there was no significant difference in APTw signals between EA-IgA positive group (N = 18) and EA-IgA negative group (N = 16), and between VCA-IgA positive group (N = 27) and VCA-IgA negative group (N = 7) (all P >0.05) for the 34 NPC patients with available serum expression of EBV antibody (Table 3).