FOXN4, a member of the forkhead box/winged-helix transcription factor superfamily, is an important transcriptional regulatory gene and significantly overexpressed in EBV-positive nasopharyngeal carcinoma (NPC), promoting EBVs replication and cells tumorigenesis [78]; KLK1 is a widely distributed serine protease, and it has been shown that the levels of KLK1 increased, in the lungs ofmice during influenza virus infection. Here, KLK1 is linked to nasopharyngeal carcinoma.