UBAP2 and nasopharyngeal carcinoma: We selected has_circ_0003496 (formed by the circularization of exons 7 and 8 of UBAP2) and has_circ_0003141 (formed by the circularization of exons 7 to 12 of UBAP2) and compared their expression with that of circUBAP2 (9,12) in the normal nasopharyngeal epithelial cell (NP69) and NPC cells (CNE2 and HNE2).