EGFR and cancer: Liposomes (spherical vesicles composed of lipid bilayers) or nanoparticles (much smaller than liposomes and made of gold, silica, or polymers) functionalized with Abs (such as, anti‐EGFR, ‐HER2, ‐PSCA, ‐PSMA) or Ab fragments, designed to selectively target the antigen expressed on cancer cells,201 can be used for tumor‐specific drug delivery.