fig2

Figure 2. Scheme of the main inorganic nanoparticles investigated for counteracting MDR in cancer. From the left to the right side, metal oxide nanoparticles (NPs), gold nanoparticles, quantum dots, mesoporous silica nanoparticles, and carbon-based nanoparticles are depicted. Possible functionalization with targeting ligands and external stimuli exploited for triggered drug release are reported. IO: iron oxide; MDR: multidrug resistance; NIR: near-infrared