Visualization nanozyme based on tumor microenvironment “unlocking” for intensive combination therapy of breast cancer

Nanozymes as artificial enzymes that mimicked natural enzyme-like activities have received great attention in cancer therapy. However, it remains a great challenge to design nanozymes that precisely exert its activity in tumor without producing off-target toxicity to surrounding normal tissues. Here, we report a synergetic enhancement strategy through the combination between nanozyme and tumor vascular normalization to destruct tumors, which was based on tumor microenvironment (TME) "unlocking." This nanozyme that we developed not only has photothermal properties but also can produce reactive oxygen species efficiently under the stimulation of TME. Moreover, this nanozyme also showed remarkable imaging performance in fluorescence imaging in the second near-infrared region and magnetic resonance imaging for visualization tracing in vivo. The process of combination therapy showed remarkable therapeutic effect for breast cancer. This study provides a therapeutic strategy by the cooperation between multifunctional nanozyme and tumor vascular normalization for intensive combination therapy of breast cancer.