ECRG4 and nasopharyngeal carcinoma: C2orf40 expression in an immortalized nasopharyngeal epithelial cell line (TERT) and seven NPC cell lines (CNE-1, CNE-2, HONE-1, SUNE-1, HNE-1, HK-1, and 5-8F) was also detected using qRT-PCR and Western blotting.