– Celecoxib is a selective Cox-2 inhibitor (IC50 of 40 nM). Celecoxib shows low sensitivity against Cox-1 (IC50 of 15 ?M). Celecoxib shows an anti-proliferative effect on nasopharyngeal carcinoma (NPC) cell lines including HNE1 (IC50of 32.86 ?M) and CNE1-LM