Cited by 84Cancer Immunotherapy and BiomarkersImmunotherapy and Immune ResponsesBladder and Urothelial Cancer Treatments

Entinostat induces antitumor immune responses through immune editing of tumor neoantigens

Open access
Truong, Andrew S., Zhou, Mi, Krishnan, Bhavani, Utsumi, Takanobu, Manocha, Ujjawal, Stewart, Kyle G., Beck, Wolfgang, Rose, Tracy L. +9 more·2021·Journal of Clinical Investigation

Abstract

Although immune-checkpoint inhibitors (ICIs) have been a remarkable advancement in bladder cancer treatment, the response rate to single-agent ICIs remains suboptimal. There has been substantial interest in the use of epigenetic agents to enhance ICI efficacy, although precisely how these agents potentiate ICI response has not been fully elucidated. We identified entinostat, a selective HDAC1/3 inhibitor, as a potent antitumor agent in our immune-competent bladder cancer mouse models (BBN963 and BBN966). We demonstrate that entinostat selectively promoted immune editing of tumor neoantigens, effectively remodeling the tumor immune microenvironment, resulting in a robust antitumor response that was cell autonomous, dependent upon antigen presentation, and associated with increased numbers of neoantigen-specific T cells. Finally, combination treatment with anti-PD-1 and entinostat led to complete responses and conferred long-term immunologic memory. Our work defines a tumor cell-autonomous mechanism of action for entinostat and a strong preclinical rationale for the combined use of entinostat and PD-1 blockade in bladder cancer.

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Crossref · 10.1172/jci138560

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  • Several previous studies have demonstrated that inhibition of HDAC enzymes by less-selective compounds can lead to increases in antigen presentation, as well as changes to intratumoral T-cell populations.

    “Several previous studies have demonstrated that inhibition of HDAC enzymes by less-selective compounds can lead to increases in antigen presentation, as well as changes to intratumoral T-cell populations (40–43).”

    From TNG260 Is a Small-Molecule CoREST Inhibitor That Sensitizes <i>STK11</i> -Mutant Tumors to Anti–PD-1 Immunotherapy (2025) · cites this paper as [43]

    The Introduction reports that HDAC inhibitors can alter the tumor immune microenvironment, and the paper reports antigen-presentation-dependent responses and changes in tumor T-cell populations. But those findings concern entinostat, which the Introduction and Methods describe as a selective HDAC1/3 inhibitor; this paper does not establish both effects for the less-selective compounds specified in the claim. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • HDAC inhibitor combined with α-PD-1/PD-L1 has shown a synergistic antitumor effect in murine tumor models.

    “HDAC inhibitor combined with α-PD-1/PD-L1 has shown a synergistic antitumor effect in murine tumor models [329–331].”

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  1. J Clin Invest. 2021;131(16):e138560 https://doi.org/10.1172/JCI138560

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Authors
Truong, A. S., Zhou, M., Krishnan, B., Utsumi, T., Manocha, U., Stewart, K. G., Beck, W., Rose, T. L., Milowsky, M. I., He, X., Smith, C. C., Bixby, L. M., Perou, C. M., Wobker, S. E., Bailey, S. T., Vincent, B. G., & Kim, W. Y.
Affiliations
  • UNC Lineberger Comprehensive Cancer Center (US)
  • University of North Carolina at Chapel Hill (US)
Corresponding author
  • Vincent, Benjamin G.
  • Kim, William Y.
Venue
Journal of Clinical Investigation
Published
2021-08-16
Volume
131
Issue
16
ISSN
  • 0021-9738 (ISSN-L)
  • 1558-8238
OpenAlex
W3195143313
Cited by
84
References
40
Citations by year
2026: 9 · 2025: 14 · 2024: 19 · 2023: 27 · 2022: 14 · 2021: 1
FWCI
5.56
Type
journal article
Language
en
Open access
Locations
  • Journal of Clinical Investigation (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Carolina Digital Repository (University of North Carolina at Chapel Hill) (submittedVersion)
  • UNC Libraries
Funders
  • American Cancer Society (RSG-14-219-01-TBG)
  • University Cancer Research Fund (N/A)
  • Uhera Foundation (N/A)
  • National Cancer Institute (F31 CA247250, K12CA120780, R01-CA241810)
Topics
  • Health Sciences › Medicine › Oncology › Cancer Immunotherapy and Biomarkers
  • Life Sciences › Immunology and Microbiology › Immunology › Immunotherapy and Immune Responses
  • Health Sciences › Medicine › Surgery › Bladder and Urothelial Cancer Treatments
Keywords
entinostat, histone deacetylase inhibitors, bladder cancer, neoantigens, immunoediting, antitumor immunity, tumor immune microenvironment, antigen presentation, anti-PD-1 therapy, combination immunotherapy, immunological memory, cell-autonomous mechanisms
MeSH terms
Antineoplastic Agents, Immunological, Animals, Antigens, Neoplasm, Benzamides, Urinary Bladder Neoplasms, Humans, Immunity, Immunocompetence, Immunotherapy, Mice, Inbred C57BL, Pyridines, T-Lymphocytes, Mice, SCID, Mice, Inbred NOD, Mice, Knockout, Cell Line, Tumor, Mice, Histone Deacetylase Inhibitors, Tumor Microenvironment

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