EGFR and cancer: To assess the specificity of EGFR‐targeting RBCEVs towards EGFR‐expressing cancer cells, EGFR‐VHH‐coated RBCEVs were labelled with CFSE and incubated with 4T1 cells expressing human EGFR (4T1‐hEGFR) and parental 4T1 cells at a suboptimal dose for 2 h.