Tumor-associated macrophages: an accomplice in solid tumor progression

Area of Science:

• Oncology
• Immunology
• Cancer Biology

Background:

• Tumor-associated macrophages (TAMs) are key players in the tumor microenvironment (TME) of many solid tumors.
• TAM infiltration correlates with poorer patient survival across various solid tumor types.

Purpose of the Study:

• To review the origins and polarization of TAMs within the TME.
• To elucidate the multifaceted roles of TAMs in promoting tumor growth, therapeutic resistance, angiogenesis, invasion, metastasis, and immunosuppression.
• To discuss TAMs as viable therapeutic targets in clinical settings.

Main Methods:

• Literature review focusing on the biology and clinical relevance of TAMs.
• Analysis of TAM functions including promotion of tumor growth, treatment resistance, angiogenesis, and metastasis.
• Exploration of therapeutic strategies targeting TAMs.

Main Results:

• TAMs originate from monocytes and adopt polarization states influenced by the TME.
• TAMs actively promote tumor progression through various mechanisms, including enhancing chemo- and radioresistance.
• TAMs play a critical role in tumor angiogenesis, migration, invasion, metastasis, and immune suppression.

Conclusions:

• TAMs are crucial mediators of solid tumor progression and therapeutic resistance.
• Targeting TAMs, through strategies like macrophage depletion or activation modulation, presents a promising avenue for cancer therapy.
• Further research into TAM-targeted therapies could significantly improve outcomes for solid tumor patients.