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Updated: Jul 3, 2026
In Vivo Immunogenicity Screening of Tumor-Derived Extracellular Vesicles by Flow Cytometry of Splenic T Cells
Published on: September 23, 2021
Exosomes as a tumor immune escape mechanism: possible therapeutic implications
Thomas E Ichim1, Zhaohui Zhong, Shalesh Kaushal
1Medistem Laboratories Inc, San Diego, USA. thomas.ichim@gmail.com
Abstract:
Advances in cancer therapy have been substantial in terms of molecular understanding of disease mechanisms, however these advances have not translated into increased survival in the majority of cancer types. One unsolved problem in current cancer therapeutics is the substantial immune suppression seen in patients. Conventionally, investigations in this area have focused on antigen-nonspecific immune suppressive molecules such as cytokines and T cell apoptosis inducing molecules such as Fas ligand. More recently, studies have demonstrated nanovesicle particles termed exosomes are involved not only in stimulation but also inhibition of immunity in physiological conditions. Interestingly, exosomes secreted by cancer cells have been demonstrated to express tumor antigens, as well as immune suppressive molecules such as PD-1L and FasL. Concentrations of exosomes from plasma of cancer patients have been associated with spontaneous T cell apoptosis, which is associated in some situations with shortened survival. In this paper we place the "exosome-immune suppression" concept in perspective of other tumor immune evasion mechanisms. We conclude by discussing a novel therapeutic approach to cancer immune suppression by extracorporeal removal of exosomes using hollow fiber filtration technology.
Insights
Cancer cell exosomes suppress the immune system, hindering therapies. Removing these exosomes via filtration offers a novel therapeutic strategy to overcome immune suppression and improve cancer treatment outcomes.
Area of Science:
- Oncology
- Immunology
- Nanotechnology
Background:
- Despite advances in molecular understanding, cancer therapies show limited survival benefits for most patients.
- Tumor-induced immune suppression remains a significant challenge in cancer therapeutics.
- Exosomes, nanovesicle particles, play roles in both immune stimulation and suppression.
Purpose of the Study:
- To review the role of cancer-derived exosomes in immune suppression.
- To contextualize exosome-mediated immune suppression within broader tumor immune evasion mechanisms.
- To propose a novel therapeutic strategy targeting exosome removal.
Main Methods:
- Literature review and conceptual analysis of exosome function in cancer immunity.
- Examination of immune suppressive molecules expressed by cancer exosomes (e.g., PD-1L, FasL).
- Discussion of hollow fiber filtration technology for extracorporeal exosome removal.
Main Results:
- Cancer cell exosomes express tumor antigens and immune suppressive molecules like PD-1L and FasL.
- Elevated plasma exosome concentrations correlate with T cell apoptosis and reduced survival in cancer patients.
- Exosomes represent a key mechanism of tumor immune evasion.
Conclusions:
- Cancer-derived exosomes significantly contribute to immune suppression, impacting therapeutic efficacy.
- Targeting and removing exosomes presents a promising avenue for novel cancer immunotherapies.
- Extracorporeal filtration of exosomes offers a potential strategy to reverse tumor-induced immune suppression.
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