“…For instance, folate ligands target folate receptor [ 82 - 84 ] , transferrin ligands target transferrin receptor [ 85 , 86 ] , epidermal growth factor (EGF) protein [ 87 ] , epidermal growth factor receptor (EGFR) antibody [ 88 ] , and cetuximab [ 89 , 90 ] target EGFR, and prostate-specific peptide [ 91 ] and prostate-specific antigen gene [ 92 ] target prostate-specific membrane antigen (PSMA). Additionally, single-stranded DNA aptamer [ 93 ] targets forkhead box M1 (FOXM1), biotin [ 94 - 97 ] and fructose [ 96 ] target biotin receptor, and humanized anti-human epidermal growth factor receptor 2 (HER2) antibody [ 98 ] , engineered peptide [ 99 ] , and bispecific antibody [ 100 ] target HER2 receptor. Liposomes can also be designed for controlled release drug delivery to combat cancer drug resistance when exposed to physicochemical or biochemical stimuli, e.g., changes in pH [ 82 , 101 , 102 ] , specific enzymes [ 103 , 104 ] , ultrasound [ 105 , 106 ] , and so on.…”