Sequential Responsive Multifunctional Nanomicelle Effectuates Collective Elimination of Breast Cancer and Cancer Stem Cells

Abstract Designing effective multifunctional nanodrugs to achieve multimodal treatment of tumors is an ideal choice to improve the poor clinical outcomes of current anti‐tumor therapies. Here, a multifunctional nanomicelle DC@H loaded with sarcoma kinase and cyclooxygenase‐2 protein dual target inhibitor DI02 is designed and prepared, which is sequentially catalyzed by carboxylesterase and glutathione for reduction, and strengthens the inhibition of cancer stem cell (CSC) related protein STAT3. The camptothecin carried by the DC@H ensures the effectiveness of chemotherapy. Ultimately, DC@H precisely releases and achieves effective inhibition of xenograft tumors based on the combination of chemotherapy, targeted therapy, and chemodynamic therapy, with a tumor inhibition rate of up to 90.89% in BALB/c nude mice. Research on lung metastasis proves that the CSC inhibitory characteristic of DC@H is a direct cause of the elimination of tumor metastatic nodules. There is no doubt that the multifunctional nano drug DC@H, which effectuates the collective elimination of breast cancer and cancer stem cells, provides a promising direction for achieving complete tumor cure in clinical practice.