Journal
VACCINES
Volume 11, Issue 1, Pages -Publisher
MDPI
DOI: 10.3390/vaccines11010055
Keywords
TAMs; immunotherapy; inflammation; prognosis; metastasis; phagocytosis; drug resistance; CD47; CSF1R; cancer stem cells; CAR macrophages; clinical trials
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The revolution in cancer immunotherapy has resulted in a paradigm shift in cancer care, with a focus on targeting the components of the adaptive immune system. However, recent developments have recognized the efficacy of targeting the innate immune system, including macrophages, in solid cancer treatment. This review provides an overview of the role of tumor-associated macrophages (TAMs) in solid malignancies and discusses potential therapeutic strategies for targeting TAMs in next-generation immunotherapy.
The revolution in cancer immunotherapy over the last few decades has resulted in a paradigm shift in the clinical care of cancer. Most of the cancer immunotherapeutic regimens approved so far have relied on modulating the adaptive immune system. In recent years, strategies and approaches targeting the components of innate immunity have become widely recognized for their efficacy in targeting solid cancers. Macrophages are effector cells of the innate immune system, which can play a crucial role in the generation of anti-tumor immunity through their ability to phagocytose cancer cells and present tumor antigens to the cells of adaptive immunity. However, the macrophages that are recruited to the tumor microenvironment predominantly play pro-tumorigenic roles. Several strategies targeting pro-tumorigenic functions and harnessing the anti-tumorigenic properties of macrophages have shown promising results in preclinical studies, and a few of them have also advanced to clinical trials. In this review, we present a comprehensive overview of the pathobiology of TAMs and their role in the progression of solid malignancies. We discuss various mechanisms through which TAMs promote tumor progression, such as inflammation, genomic instability, tumor growth, cancer stem cell formation, angiogenesis, EMT and metastasis, tissue remodeling, and immunosuppression, etc. In addition, we also discuss potential therapeutic strategies for targeting TAMs and explore how macrophages can be used as a tool for next-generation immunotherapy for the treatment of solid malignancies.
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