EGFR and nasopharyngeal carcinoma: Subsequent immunofluorescence studies also confirmed that H‐EVs treatment up‐regulated the expression of EGFR in 6–10B and S26 cells (Figure 4b), suggesting that H‐EVs may promote the metastasis of poorly metastatic NPC cells by increasing the expression of EGFR to a level similar to that in highly metastatic NPC cells.