CD79A and nasopharyngeal carcinoma: We found that the median IgA-gH/gL OD value for patients with stage IV NPC (0.96±0.35) was higher than that of early stage (I+II) (0.81±0.28) and stage III patients (0.79±0.35), but this was not statistically significant (I+II vs. III p = 0.284, I+II vs. IV p = 0.204, III vs. IV p = 0.671).