Cited by 65Genetic factors in colorectal cancerCancer Immunotherapy and BiomarkersColorectal Cancer Treatments and Studies

Microsatellite Instability in Colorectal Cancers: Carcinogenesis, Neo-Antigens, Immuno-Resistance and Emerging Therapies

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Randrian, Violaine, Evrard, Camille, Tougeron, David·2021·Cancers

Abstract

A defect in the DNA repair system through a deficient mismatch repair system (dMMR) leads to microsatellite instability (MSI). Microsatellites are located in both coding and non-coding sequences and dMMR/MSI tumors are associated with a high mutation burden. Some of these mutations occur in coding sequences and lead to the production of neo-antigens able to trigger an anti-tumoral immune response. This explains why non-metastatic MSI tumors are associated with high immune infiltrates and good prognosis. Metastatic MSI tumors result from tumor escape to the immune system and are associated with poor prognosis and chemoresistance. Consequently, immune checkpoint inhibitors (ICI) are highly effective and have recently been approved in dMMR/MSI metastatic colorectal cancers (mCRC). Nevertheless, some patients with dMMR/MSI mCRC have primary or secondary resistance to ICI. This review details carcinogenesis and the mechanisms through which MSI can activate the immune system. After which, we discuss mechanistic hypotheses in an attempt to explain primary and secondary resistances to ICI and emerging strategies being developed to overcome this phenomenon by targeting other immune checkpoints or through vaccination and modification of microbiota.

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Crossref · 10.3390/cancers13123063

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  • MSI/dMMR could be a prognostic test in ICI-based immunotherapy to show how tumours respond to antibodies, particularly in cancers such as colorectal, gastric cancer and endometriosis.

    “Currently, discovered that MSI/dMMR could be a prognostic test in ICI-based immunotherapy to show how tumours respond to antibodies, particularly in cancers such as colorectal, gastric cancer and endometriosis [114].”

    From Immune Checkpoint Inhibitors in Cancer Therapy (2022) · cites this paper as [114]

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Authors
Randrian, V., Evrard, C., & Tougeron, D.
Affiliations
  • Université de Poitiers (FR)
  • Centre Hospitalier Universitaire de Poitiers (FR)
Corresponding author
Randrian, Violaine
Venue
Cancers
Publisher
MDPI AG
Published
2021-06-19
Volume
13
Issue
12
Pages
3063
ISSN
2072-6694 (ISSN-L)
OpenAlex
W3173665078
Cited by
65
References
113
Citations by year
2026: 8 · 2025: 16 · 2024: 7 · 2023: 13 · 2022: 16 · 2021: 3 · 2013: 1
FWCI
1.71
Type
journal article
Language
en
Open access
Locations
  • Cancers (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • HAL (submittedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Topics
  • Health Sciences › Medicine › Pathology and Forensic Medicine › Genetic factors in colorectal cancer
  • Health Sciences › Medicine › Oncology › Cancer Immunotherapy and Biomarkers
  • Health Sciences › Medicine › Oncology › Colorectal Cancer Treatments and Studies
Keywords
microsatellite instability, colorectal cancer, mismatch repair deficiency, DNA repair deficiency, neoantigens, tumor immune infiltrate, immune checkpoint inhibitors, immune resistance, chemoresistance, metastatic colorectal cancer, tumor immunogenicity, cancer vaccination, gut microbiota

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