A) Uptakes of AuNCs by MDA-MB-435 cells after incubation for 2 h, where the AuNCs had different coverage densities of SV119 on the surface; B) uptakes of SV119-PEG-AuNCs and PEG-AuNCs, respectively, by MDA-MB-435 cells after incubation for different periods of time; and C) uptakes of SV119-PEG-AuNCs and PEG-AuNCs, respectively, by MDA-MB-435 cells after incubation with the AuNCs at different concentrations for 2 h.