Deciphering the colorectal tumor microenvironment: Interactions and targets for effective therapy

Area of Science:

• Oncology
• Immunology
• Cancer Biology

Background:

• The colorectal tumor microenvironment (TME) comprises malignant cells, stromal components (cancer-associated fibroblasts, extracellular matrix), and immune cells.
• Immune cells within the TME, particularly cytotoxic CD8+ T lymphocytes (CTLs), can be suppressed by other cells, impacting anti-tumor immunity.
• Intercellular communication via cytokines, exosomes, and chemokines orchestrates TME dynamics, influencing cancer progression and therapeutic resistance.

Purpose of the Study:

• To review the complex cellular and molecular interactions within the colorectal TME.
• To highlight the role of the TME in promoting metastasis and resistance to anticancer therapies.
• To identify novel therapeutic targets and combination strategies for colorectal cancer.

Main Methods:

• Literature review of recent studies on colorectal tumor microenvironment.
• Analysis of cellular and molecular interdependencies within the TME.
• Synthesis of current understanding of TME-mediated effects on cancer progression and treatment.

Main Results:

• The TME contains diverse cell types (malignant, stromal, immune) with complex interactions.
• These interactions can promote cancer metastasis, invasion, stemness, and resistance to therapies like chemotherapy and radiotherapy.
• While some immune cells suppress anti-tumor responses, others can enhance antigen presentation and T cell activation.

Conclusions:

• A comprehensive understanding of TME intricacies is crucial for effective colorectal cancer therapy.
• Targeting TME components and interactions offers potential for novel therapeutic strategies.
• Combination modalities hold promise for overcoming treatment resistance and improving patient outcomes.