CASC19 and nasopharyngeal carcinoma: Furthermore, to determine whether CASC19 contributes to the autophagy-regulated radioresistance of NPC cells by negatively regulating miR-340-3p, we transfected siCASC19 and/or miR-340-3p inhibitor together with an autophagy indicator Ad-mRFP-GFP-LC3 into radioresistant CNE2R cells.