BIRC2 and nasopharyngeal carcinoma: To further confirm the roles of BIRC2 in the malignant progression of NPC, we generated 5-8 F and HNE1 cell lines stably overexpressing BIRC2, and the expression efficiency of exogenous BIRC2 was confirmed by western blotting and qRT–PCR (Fig. 2A and Fig. S2B).