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Updated: May 13, 2026

Studying the Effects of Tumor-Secreted Paracrine Ligands on Macrophage Activation using Co-Culture with Permeable Membrane Supports
Published on: November 28, 2019
Macrophage regulation of tumor responses to anticancer therapies
Michele De Palma1, Claire E Lewis
1The Swiss Institute for Experimental Cancer Research (ISREC), School of Life Sciences, Swiss Federal Institute of Technology Lausanne (EPFL), CH-1015 Lausanne, Switzerland. michele.depalma@epfl.ch
Abstract:
Tumor-associated macrophages (TAMs) promote key processes in tumor progression, like angiogenesis, immunosuppression, invasion, and metastasis. Increasing studies have also shown that TAMs can either enhance or antagonize the antitumor efficacy of cytotoxic chemotherapy, cancer-cell targeting antibodies, and immunotherapeutic agents--depending on the type of treatment and tumor model. TAMs also drive reparative mechanisms in tumors after radiotherapy or treatment with vascular-targeting agents. Here, we discuss the biological significance and clinical implications of these findings, with an emphasis on novel approaches that effectively target TAMs to increase the efficacy of such therapies.
Insights
Tumor-associated macrophages (TAMs) play a dual role in cancer, influencing treatment efficacy and driving tumor progression. Targeting TAMs offers a promising strategy to enhance current cancer therapies.
Area of Science:
- Immunology
- Oncology
- Cancer Biology
Background:
- Tumor-associated macrophages (TAMs) are critical regulators of the tumor microenvironment.
- TAMs influence tumor progression, including angiogenesis, immunosuppression, invasion, and metastasis.
- The role of TAMs in treatment response is context-dependent, affecting chemotherapy, antibody therapy, and immunotherapy.
Purpose of the Study:
- To review the biological significance of TAMs in cancer.
- To discuss the clinical implications of TAMs in various cancer treatments.
- To highlight novel strategies for targeting TAMs to improve therapeutic efficacy.
Main Methods:
- Literature review and synthesis of existing research on TAMs.
- Analysis of TAMs' roles in tumor progression and treatment response.
- Discussion of emerging therapeutic approaches targeting TAMs.
Main Results:
- TAMs promote key aspects of tumor progression.
- TAMs can either enhance or inhibit the effectiveness of diverse cancer treatments.
- TAMs are involved in tumor repair following radiotherapy and anti-angiogenic treatments.
Conclusions:
- Understanding TAM biology is crucial for cancer treatment optimization.
- Targeting TAMs presents a viable strategy to overcome treatment resistance.
- Novel TAM-targeting therapies hold potential for improving patient outcomes in oncology.
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