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Updated: Sep 8, 2025

Analysis of Human T Cell Activity in an Allogeneic Co-Culture Setting of Pre-Treated Tumor Cells
Published on: March 7, 2025
Adaptive immune resistance at the tumour site: mechanisms and therapeutic opportunities
Tae Kon Kim1,2, Esten N Vandsemb3, Roy S Herbst2
1Division of Hematology/Oncology, Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA.
Abstract:
Tumours employ various tactics to adapt and eventually resist immune attack. These mechanisms are collectively called adaptive immune resistance (AIR). The first defined and therapeutically validated AIR mechanism is the selective induction of programmed cell death 1 ligand 1 (PDL1) by interferon-γ in the tumour. Blockade of PDL1 binding to its receptor PD1 by antibodies (anti-PD therapy) has resulted in remission of a fraction of patients with advanced-stage cancer, especially in solid tumours. However, many clinical trials combining anti-PD therapy with other antitumour drugs conducted without a strong mechanistic rationale have failed to identify a synergistic or additive effect. In this Perspective article, we discuss why defining AIR mechanisms at the tumour site should be a key focus to direct future drug development as well as practical approaches to improve current cancer therapy.
Insights
Tumours develop adaptive immune resistance (AIR) to evade immune attack. Understanding these AIR mechanisms is crucial for developing effective cancer therapies beyond current anti-PD treatments.
Area of Science:
- Immunology
- Cancer Biology
- Drug Development
Background:
- Tumours evade immune responses through adaptive immune resistance (AIR) mechanisms.
- Programmed cell death 1 ligand 1 (PDL1) induction by interferon-γ is a validated AIR mechanism.
- Anti-PD therapy shows efficacy in a subset of advanced cancers, particularly solid tumours.
Purpose of the Study:
- To highlight the importance of defining AIR mechanisms at the tumour site.
- To guide future drug development strategies for cancer therapy.
- To propose practical approaches for enhancing current cancer treatments.
Main Methods:
- Review of existing literature on adaptive immune resistance.
- Analysis of clinical trial outcomes combining anti-PD therapy with other drugs.
- Discussion of mechanistic rationale for drug development.
Main Results:
- Many combination therapies fail due to a lack of mechanistic understanding.
- Defining specific AIR mechanisms is key to improving therapeutic outcomes.
- Targeting AIR offers potential for synergistic or additive effects.
Conclusions:
- A deeper understanding of tumour-specific AIR mechanisms is essential.
- Future cancer drug development should focus on rational combination strategies.
- Optimizing current anti-PD therapy requires a focus on overcoming resistance.
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