EPCAM and nasopharyngeal carcinoma: Kaplan–Meier survival curves and log-rank test survival analysis showed that the overall survival (OS), progression-free survival (PFS) and distant-metastasis-free survival (DMFS) of NPC patients with high levels of EpCAM was significantly poorer than that of patients with low levels of EpCAM (P < 0.05; Fig. 1d–f).