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The Tumor Microenvironment

The Tumor Microenvironment

Every normal cell or tissue is embedded in a complex local environment called stroma, consisting of different cell types, a basal membrane, and blood vessels. As normal cells mutate and develop into cancer cells, their local environment also changes to allow cancer progression. The tumor microenvironment (TME) consists of a complex cellular matrix of stromal cells and the developing tumor. The cross-talk between cancer cells and surrounding stromal cells is critical to disrupt normal tissue...

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Tumor Immunotherapy

Immunotherapy is a treatment that boosts or manipulates the immune system to fight diseases, including cancer. For instance, by stimulating an immune response through vaccinations against viruses that cause cancers, like hepatitis B virus and human papillomavirus, these diseases can be prevented. Nonetheless, some cancer cells can avoid the immune system due to their rapid mutation and division. The immune response to many cancers involves three phases: elimination, equilibrium, and escape.

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Related Experiment Video

Updated: Jun 29, 2025

Analysis of Human T Cell Activity in an Allogeneic Co-Culture Setting of Pre-Treated Tumor Cells

Analysis of Human T Cell Activity in an Allogeneic Co-Culture Setting of Pre-Treated Tumor Cells

Published on: March 7, 2025

Immunologic tumor microenvironment modulators for turning cold tumors hot.

Gholam-Reza Khosravi¹, Samaneh Mostafavi², Sanaz Bastan¹

¹Department of Medical Immunology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran.

Cancer Communications (London, England)

|March 29, 2024

Summary

Hot tumors respond well to immunotherapy, unlike cold tumors. Immune checkpoint inhibitors (ICIs) can convert cold tumors to hot, but challenges like resistance and side effects remain, requiring new strategies for effective cancer treatment.

Keywords:

cold tumor hot tumor immunologic modulator immunotherapy therapeutic strategy tumor microenvironment

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Area of Science:

Oncology
Immunology
Cancer Research

Background:

Tumors are classified by immune cell presence in the tumor microenvironment (TME).
Hot tumors exhibit high immune activity and respond to immune checkpoint inhibitors (ICIs).
Cold tumors lack immune infiltration and resist therapy.

Purpose of the Study:

To review advancements in cancer immunotherapy, focusing on immune modulators.
To discuss strategies for overcoming resistance in cold tumors.
To highlight challenges and future directions in enhancing immunotherapy effectiveness.

Main Methods:

Review of current literature on tumor immunophenotypes and immunotherapies.
Analysis of immune checkpoint inhibitors (ICIs) targeting CTLA-4 and PD-1/PD-L1.
Exploration of strategies to overcome immune evasion and resistance.

Main Results:

Immune checkpoint inhibitors (ICIs) can transform cold tumors into hot ones.
Novel immunologic modulators show promise in reactivating the immune system.
Challenges include primary resistance, autoimmune side effects, and response heterogeneity.

Conclusions:

Understanding the TME is crucial for reprogramming immune responses.
Innovative strategies and combination therapies are needed to improve immunotherapy efficacy.
Further research is essential for developing safer and more effective cancer treatments for immune-resistant tumors.