EGFR and breast neoplasm: For example, a fusion of the platelet derived growth factor receptor transmembrane domain and an epidermal growth factor receptor (EGFR)‐targeting peptide is expressed from a retroviral plasmid in HEK‐293T cells to produce EGFR‐targeting EVs that deliver anti‐cancer let‐7 to breast tumours (Ohno et al., 2013).