Application and challenges of smart responsive multifunctional nanoplatforms in integrated diagnosis and treatment of bladder cancer and overcoming therapeutic resistance.

Bladder cancer, particularly muscle-invasive bladder cancer, has become a major challenge in clinical treatment due to its high recurrence rate and therapeutic resistance. Traditional treatments-including transurethral resection of bladder tumors, intravesical chemotherapy, and radical cystectomy-exhibit significant limitations in drug delivery efficiency and anti-resistance efficacy, failing to achieve improved therapeutic outcomes. In recent years, smart, responsive, and multifunctional nanoplatforms have gained attention for their precise responsiveness to the tumor microenvironment, enabling targeted and controlled drug release, as well as multimodal combination therapy with promising clinical applications. This review examines the design principles of smart, responsive nanoparticles and their specific applications in the integrated diagnosis and treatment of bladder cancer, exploring their role and advantages in overcoming therapeutic resistance mechanisms. Additionally, it analyzes engineering challenges and safety concerns encountered during the transition from laboratory research to clinical translation, proposing future development strategies and countermeasures. The review aims to provide systematic theoretical support and practical guidance for innovative developments in bladder cancer nanomedicine, thereby advancing the field of precision medicine.