Traditional cancer treatment methodologies, including chemotherapy, surgery, radiotherapy, and immunotherapy, commonly lead to severe adverse reactions. In recent years, innovative treatment modalities, particularly photodynamic therapy (PDT) and photothermal therapy (PTT), have garnered increasing attention due to their enhanced therapeutic levels. Against this background, black TiO₂, a new kind of functional material, has become a research emphasis in the domain of cancer treatment. This material exhibits broad spectral absorption and strong near-infrared light penetration, enabling it to efficiently satisfy the optical requirements of both PDT and PTT. This article presents a mini review of PDT, PTT, and their synergistic combination strategies based on black TiO₂.

T cell-derived extracellular vesicles (TcEVs) are nanoscale lipid bilayer-bound particles, including exosomes, microvesicles, apoptotic bodies, and T cell microvilli particles. TcEVs possess advantages such as high yield, favorable biocompatibility, low immunogenicity, and excellent solid tumor penetration, showing great potential in cancer immunotherapy. However, natural TcEVs exhibit weak targeting ability, limited immune activity, and low drug-loading capacity. To address these issues, several engineering strategies have been adopted to modify the vesicles through genetic engineering, surface modification, and drug-loading, thereby achieving effective treatment of both hematological and solid tumors. This review summarizes TcEVs’ classification, biological functions, engineering strategies, and applications in cancer immunotherapy, while discussing challenges and prospects to facilitate their clinical translation.