CD79A and nasopharyngeal carcinoma: The mean ELISA reading of EBV IgG and IgA antibodies in the regular smokers group of NPC patients, 0.379 ± 0.043 and 0.493 ± 0.084 respectively, was much higher than that of the non-regular smokers group, 0.19 ± 0.057 and 0.213 ± 0.056 respectively (p < 0.01) (Table 3 and Fig. 7).