PTGDR and nasopharyngeal carcinoma: In the study of NPC, some lncRNAs are playing oncogenetic roles such as LINC01420 101, LOC100129148 102, NPCCAT1 103, AFAP1-AS1104, etc. Enhanced expression of them can either promote cell growth, proliferation, migration and invasion, or predict markedly poorer survival time (LOC100129148 and AFAP1-AS1), which may function as a competitive 'sponge' for miRNA (LOC100129148 and AFAP1-AS1) or directly binds to target gene mRNA 5'UTR and regulates its protein level (NPCCAT1).