Fig. 5

Different treatments of 4T1 cells. a 4T1 cells incubated with PEG-GNCs or CD44-PEG-GNCs for 24 h, then exposed to an 808-nm NIR laser (5 W/cm², 2.5 W/cm²), measured by the CCK-8 assay. b–g Fluorescent images of 4T1 cells stained with a Hoechst/PI double staining kit. There were more dead cells in the CD44-PEG-GNCs group than in the control; the co-treatment group exhibited the greatest number of dead cells. These experiments were repeated 3 times, P < 0.05