EIF3C and nasopharyngeal carcinoma: In order to research the role of EIF3C in head and neck carcinoma, the lentiviral-mediated EIF3C shRNA vector (L.v-shEIF3C) and the negative control shRNA vector (L.v-shCtrl) were constructed to infect the human pharyngeal squamous carcinoma cell line FaDu and the human nasopharyngeal carcinoma cell line 5-8F.