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June 28, 2026Science Immunology

T reg cells promote immunotherapy-induced immune evasion by restraining CD4 T cell control of MHC-I–deficient metastatic pancreatic cancer

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Authors

ZSZoe C. SchmiechenECEduardo Cruz-HinojozaAHAudrey L. Hilk

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Overview

Randomized trial identifies T reg cells' role in immune evasion in pancreatic cancer, suggesting new therapy targets.

Key Points

  • This research aims to explore how T reg cells contribute to immune evasion in pancreatic cancer during immunotherapy.
  • Evaluated the impact of programmed death-ligand 1 blockade on immune responses in pancreatic cancer.
  • Depleted T reg cells and transferred tumor-reactive CD4 T cells to assess control of metastasis.
  • Analyzed patient tumors for colocalization of T reg cells and CD4 T cells and their correlation with survival.
  • Programmed death-ligand 1 blockade led to epigenetic Tap1 silencing and reduced MHC-I expression.
  • Depletion of T reg cells improved CD4 T cell efficacy and reduced metastasis in murine models.
  • Restoration of MHC-I with anti–CTLA-4 therapy correlated with prolonged survival and favorable gene signatures in tumor samples.

Cite This Study

Schmiechen et al. (2026) studied this question.

synapsesocial.com/papers/6a40b9f361bb0a67205c5f2ehttps://doi.org/10.1126/sciimmunol.adz4302
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Also Consider

Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context:

  1. 1Reprogramming the tumor microenvironment to overcome immunotherapy resistance in pancreatic cancer2025
  2. 2Tumor Immune Evasion Mechanisms and Immunotherapy Strategies2025
  3. 3CD4+ T cells mediate MHC-deficient tumor rejection and endothelial cell reprogramming2025 · 3 citations
  4. 4The Effect of T Regulatory Cell Infiltration on Survival Outcomes in Metastatic Pancreatic Cancer Patients with a Review of Immunobiology, Prognostic Value and Future Therapeutic Options2025
  5. 5The Effect of T Regulatory Cell Infiltration on Survival Outcomes in Metastatic Pancreatic Cancer Patients with a Review of Immunobiology, Prognostic Value and Future Therapeutic Options2025