Subcutaneous (SC) administration of chemotherapeutics combined with near-infrared (NIR) light activation can effectively target skin tumors by triggering localized drug release and enhancing cytotoxic effects. In this study, we developed NIR-responsive indocyanine green (ICG) and the chemotherapeutic agent doxorubicin (Dox) loaded into gelatin nanoparticles (NPs) for SC delivery in a skin tumor-bearing mouse model. Histological examination (hematoxylin and eosin staining) confirmed the successful delivery and swelling behavior of the Dox/ICG-loaded gelatin NPs at the SC site.
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