Wound healing assay (A,B); the % of wound closure plot (C); viable MDA-MB-231 and SK-BR3 cell percentages versus an empty liposome concentration equivalent to that used for drug-loaded liposomes in Figures (F,G) over the period of 72 h (D,E); viable MDA-MB-231 and SK-BR3 cell percentage versus concentrations of 5-FU in cells treated with free 5-FU, 5-FU-pHLip, and FA-iRGD-5-FU-pHLip over the period of 48 h (F,G) and 72 h (H,I), respectively. [One asterisk (*), two asterisks (**), and three asterisks (***) denote significant p values, i.e., <0.05, <0.01, and <0.001, respectively, and ns as non-significant].