Fig. 2From: Tumor microenvironment-responsive nanoparticles for cancer theragnostic applicationsSchematic illustration of hypoxia-responsive drug delivery. a Fabrication of DOX-loaded PEI-NI-based nanoparticle co-assembled with HA-Ce6, (b) CD 44-mediated endocytosis and release of DOX in response to hypoxia generated by laser irradiation. Reproduced with permission [65] of The Royal Society of ChemistryBack to article page