PTGS2 and nasopharyngeal carcinoma: Its expression contributes to NPC tumorigenesis and progression by the upregulation of cyclooxygenase-2 (COX-2) via miR-101 sponging and fatty acid synthase (FASN) (Ma et al., 2017; Hu et al., 2018), and the expression is positively correlated with NPC poor prognosis.