In our previous, we reported our experience of detecting EBV-derived genomic DNA, includes EBNA-1, EBNA-2, LMP-1 and LMP-2, counting for 46.32%, 49.47%, 45.26% and 47.37%, respectively, by nasopharyngeal swab in NPC patients (Lao et al., 2017). The gene discussed is PSMB9; the disease is nasopharyngeal carcinoma.