KPNA2 and nasopharyngeal carcinoma: For instance, in NPC, two different ceRNA mechanisms involving BBOX1-AS1 have been identified: BBOX1-AS1 can promote the proliferation, migration, and invasion of NPC cells by targeting miR-3940-3p/KPNA2 axis [37] and miR-204-5p/MUC4 axis [36].