Shaping immunotherapy through the tumor microenvironment: Translational perspectives.

Area of Science:

• Oncology
• Immunology
• Cancer Biology

Background:

• The tumor microenvironment (TME) is a complex ecosystem that promotes cancer progression and immune evasion.
• It orchestrates resistance to current immunotherapies, necessitating novel therapeutic strategies.

Purpose of the Study:

• To review the immunosuppressive mechanisms within the TME.
• To synthesize translational strategies for reprogramming the TME beyond single-agent immunotherapies.
• To highlight emerging frontiers in cancer immunotherapy.

Main Methods:

• Review of current literature on TME biology and immunotherapy.
• Analysis of preclinical and clinical data on combination therapies.
• Appraisal of biomarkers for predicting treatment response.

Main Results:

• Identified key immune evasion mechanisms including regulatory cells, metabolic competition, and immune checkpoints (e.g., PD-L1).
• Synthesized strategies like metabolic targeting, stromal disruption, cellular engineering, and combination therapies.
• Evaluated biomarkers such as tumor mutational burden and T cell infiltration.

Conclusions:

• Precise modulation of the TME is crucial for achieving durable anti-tumor immunity.
• Combination therapies and novel approaches like neoantigen vaccines and microbiome modulation hold promise for converting 'cold' tumors to 'hot'.
• This review provides insights for the next generation of cancer immunotherapies.