STING1 and cancer: To overcome these constraints, IONPs orchestrate multimodal immunotherapeutic strategies: they reprogram suppressive niches by polarizing macrophages toward M1 phenotypes, activate STING pathways, and induce immunogenic ferroptosis; enable precision delivery via magnetic lymph node targeting and cancer cell membrane-mediated homologous tumor homing; and facilitate real-time theranostics through MRI/magnetic particle imaging (MPI)-monitored immune cell trafficking.