Fig. 7

a In vivo fluorescence imaging of tumor-bearing mice after IV injection of DiR-labeled RAM264.7 cells, DiR-labeled MAs-DOX/PEG-BPEI-rGO and DiR-labeled MAs-DOX at different time points. Fluorescence intensities of the tumor sites at 48 h were quantified by the Living Image software. b Fluorescence distribution of DOX in tumors and major organs after IV injection of free DOX, MAs-DOX/PEG-BPEI-rGO with NIR treatment and DOX/PEG-BPEI-rGO with NIR treatment. Fluorescence intensities were quantified by Living Image software. Data are expressed as mean ± SD (n = 3), *p < 0.05, **p < 0.01