Genetic modification hasalso been used to modify HEK293 cells to secrete exosomes that express a peptide (GE11)that specifically binds to EGFR, promoting their interaction with EGFR-positive breastcancer cells and their delivery of a therapeutic miRNA (let-7a) to attenuate tumordevelopment in a mouse model of breast cancer.57 Here, EGFR is linked to breast cancer.