CD79A and nasopharyngeal carcinoma: The results showed that the EBNA1-IgA positive rates of CLIA and ELISA-2 were 8.5% and 8.8%, respectively, and the VCA-IgA positive rate by ELISA-1 was 4.8% in healthy people in high-incidence areas, and the antibody positive rate was higher in healthy population in high-incidence areas (P < 0.017), while there were no significant differences in the antibody positive rates between medium-incidence areas and low-incidence areas of NPC (P > 0.05).