Breaking the Depth Dependence by Nanotechnology‐Enhanced X‐Ray‐Excited Deep Cancer Theranostics
Abstract
The advancements in nanotechnology have created multifunctional nanomaterials aimed at enhancing diagnostic accuracy and treatment efficacy for cancer. However, the ability to target deep‐seated tumors remains one of the most critical challenges for certain nanomedicine applications. To this end, X‐ray‐excited theranostic techniques provide a means of overcoming the limits of light penetration and tissue attenuation. Herein, a comprehensive overview of the recent advances in nanotechnology‐enhanced X‐ray‐excited imaging and therapeutic methodologies is presented, with an emphasis on the design of multifunctional nanomaterials for contrast‐enhanced computed tomography (CT) imaging, X‐ray‐excited optical luminescence (XEOL) imaging, and X‐ray‐excited multimodal synchronous/synergistic therapy. The latter is based on the concurrent use of radiotherapy with chemotherapy, gas therapy, photodynamic therapy, or immunotherapy. Moreover, the featured biomedical applications of X‐ray‐excited deep theranostics are discussed to highlight the advantages of X‐ray in high‐sensitivity detection and efficient elimination of malignant tumors. Finally, key issues and technical challenges associated with this deep theranostic technology are identified, with the intention of advancing its translation into the clinic.
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