pH-Activated Nanoplatform Derived from M1 Macrophages' Exosomes for Photodynamic and Ferroptosis Synergistic Therapy to Augment Cancer Immunotherapy.

Combining nanomedicine with immunotherapy offers a promising and potent cancer treatment strategy; however, improving the effectiveness of the antitumor immune response remains challenging. A "cold" tumor microenvironment (TME) is a marked factor affecting the efficacy of immunotherapy. Herein, intracellular-acidity-activatable dynamic nanoparticles (NPs) were designed for precision photodynamic immunotherapy and ferroptosis in cancer.