CLDN7 and cancer: Their function in the development of cancers is mainly due to that some CLDNs can also interact with non-tight junction proteins, including the cell adhesion proteins (EpCam and tetraspanins), the signaling proteins (ephrin A and B) and their receptors (EphA and EphB, 32) The expression of CLDNs differs in various organs [1, 11, 36], Several articles have reported the correlation between CLDN1 & CLDN7 on NPC cells, and demonstrated that CLDN7 may serve as a useful biomarker in the prediction of distant metastasis and patient survival in NPC [24, 25].