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The recent designs of dynamic nanoassemblies exploiting the tumor-targeting properties have received increasing attention for tumor imaging and therapy due to their tumor-specific delivery and enhanced antitumor efficacy. However, these designs are mainly focused on the macroscopic tumor therapeutic effect, while the nano-bio interactions in the tumor microenvironment (TME) remain poorly understood. This review aims to provide an overview of the development of tumor-responsive nanoassemblies towards the imaging, therapy and TME modulation in the tumor site. The tumor biology leading to TME formation and the potential TME properties for the practicable design of tumor-targeting nanoassemblies has been outlined. Furthermore, the various approaches for TME modification and the realization via dynamic nanoassemblies for enhanced tumor therapy were reviewed. Lastly, the prospects of these …