CDKN1B and nasopharyngeal carcinoma: We found convincing evidence for the existence of a hsa_circ_0002538/miR-589-5p/RPGR axis dysregulated in NPC, and a hsa_circ_0008129/miR-221-3p/CDKN1B axis, which is differentially regulated in EBV+ vs. EBV- cell lines.