STAT3 and nasopharyngeal carcinoma: Recently exosomal miR-24-3p, miR-891a, miR-106a-5p, miR-20a-5p and miR-1908 released by the nasopharyngeal carcinoma line TW03 were found to be enriched in the serum of nasopharyngeal carcinoma patients and to inhibit Th1 and Th17 cell differentiation while promoting Treg cell differentiation by decreasing the activity of extracellular signal-regulated kinases (ERK), signal transducer and activator of transcription (STAT) 1 and STAT3 and increasing the activity of STAT5 in exosome-treated T cells [42,43].