FGF2 and nasopharyngeal carcinoma: Exosomes released from nasopharyngeal carcinoma (NPC) cells positive for EBV, in which the latency II program of the virus is expressed, contain LMP1 [71], viral miRNAs and signal transduction molecules, such as the epidermal growth factor receptor EGFR [71], galectin-9 [74], fibroblast growth factor (FGF-2) [75], deoxyuridinetriphosphatase (dUTPase) [76].