Figure 1From: The distinctive profile of risk factors of nasopharyngeal carcinoma in comparison with other head and neck cancer types This histogram shows the difference in the mean serum level of EBV IgG antibodies measured in ELISA OD in HNCA as one group, NPC, HPC, and CL patients as well as control subjects. The mean serum level of EBV IgG antibodies in NPC patients was significantly higher than in CL, HPC, HNCA and control groups.Back to article page