WNK2 and nasopharyngeal carcinoma: The mitogen-activated protein kinase (MAPK) signaling pathway was associated with the smallest P-value (1.8×10−11) among the pathways targeted by the five miRNAs over-expressed in NPC exosomes, which included hsa-miR-24-3p, hsa-miR-891a, hsa-miR-106a-5p, hsa-miR-20a-5p, and hsa-miR-1908.