EIF4EBP1 and nasopharyngeal carcinoma: IHC analysis of 23 NPC cases identified a positive correlation between the EpCAM expression level and phosphorylated 4EBP1 (R = 0.6828, P = 0.0003) and a negative correlation between EpCAM and PTEN (R = 0.6324, P = 0.0012) (Fig. 5c).