EPCAM and nasopharyngeal carcinoma: Moreover, western blotting analysis revealed an obviously higher level of EpCAM expression in HONE1, SUNE1, C666-1 and S-26 cell lines, whereas the normal epithelial NP69 cell line and the other four NPC cell lines (HNE1, S-18, 6–10B and 5–8F) showed undetectable or very low levels of endogenous EpCAM expression (Fig. 1b).