Platelet Membrane Coated Cu9S8‐SNAP for Targeting NIR‐II Mild Photothermal Enhanced Chemodynamic/Gas Therapy of Triple‐Negative Breast Cancer

Abstract Triple‐negative breast cancer (TNBC) is a highly aggressive and uncommon subtype of breast cancer with a poor prognosis. It is crucial to prioritise the creation of a nanotherapeutic method that is highly selective and actively targeting TNBC. This study explores a new nanosystem, Cu 9 S 8 ‐SNAP@PM (C‐S@P), composed of Cu 9 S 8 ‐SNAP coated with a platelet membrane (PM). The purpose of this nanosystem is to cure TNBC using multimodal therapy. The utilisation of PM‐coated nanoparticles (NPs) enables active targeting, leading to the efficient accumulation of C‐S@P within the tumour. The Cu 9 S 8 component within these NPs serves the potential to exert photothermal therapy (PTT) and chemodynamic therapy (CDT). Simultaneously, the S‐Nitroso‐N‐Acetylvanicillamine (SNAP) component enables nitric oxide (NO) gas therapy (GT). Furthermore, when exposed to NIR‐II laser light, Cu 9 S 8 not only increases the temperature of the tumour area for PTT, but also boosts CDT and stimulates the release of NO through thermal reactions to improve the effectiveness of GT. Both in vitro and in vivo experimental results validate that C‐S@P exhibits minimal side effects and represents a multifunctional nano‐drug targeted at tumors for efficient treatment. This approach promises significant potential for TNBC therapy and broader applications in oncology.