CD79A and nasopharyngeal carcinoma: Real-time polymerase chain reaction combined with enzyme-linked immunoadsorbent assay was used to determine the level of IgA/VCA in 370 individuals that were grouped as follows: 120 with primary NPC, eight with locally recurrent NPC, 21 with metastatic NPC, 76 with radiotherapy-resistant NPC, 60 with NPC in remission, 38 with non-NPC tumors, and a control group of 47 subjects.