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Oncoimmunology. 2018 Mar 15;7(6):e1433981. doi: 10.1080/2162402X.2018.1433981. eCollection 2018.

PD-1/PD-L1 pathway: an adaptive immune resistance mechanism to immunogenic chemotherapy in colorectal cancer.

Oncoimmunology

Magalie Dosset, Thaiz Rivera Vargas, Anaïs Lagrange, Romain Boidot, Frédérique Végran, Aurélie Roussey, Fanny Chalmin, Lucile Dondaine, Catherine Paul, Elodie Lauret Marie-Joseph, François Martin, Bernhard Ryffel, Christophe Borg, Olivier Adotévi, François Ghiringhelli, Lionel Apetoh

Affiliations

  1. INSERM, U1231, Dijon, France.
  2. INSERM, U1098, Besançon, France.
  3. LabEx LipSTIC, Besançon, France.
  4. Université de Bourgogne Franche Comté, Dijon, France.
  5. Centre Georges François Leclerc, Dijon, France.
  6. University of Cape Town, RSA, CNRS, UMR7355, Orleans, France, IDM.
  7. Department of Medical Oncology, University Hospital of Besançon, France.

PMID: 29872568 PMCID: PMC5980491 DOI: 10.1080/2162402X.2018.1433981

Abstract

BACKGROUND: Chemotherapy is currently evaluated in order to enhance the efficacy of immune checkpoint blockade (ICB) therapy in colorectal cancer. However, the mechanisms by which these drugs could synergize with ICB remains unclear. The impact of chemotherapy on the PD-1/PD-L1 pathway and the resulting anticancer immune responses was assessed in two mouse models of colorectal cancer and validated in tumor samples from metastatic colorectal cancer patients that received neoadjuvant treatment. We demonstrated that 5-Fluorouracil plus Oxaliplatin (Folfox) drove complete tumor cure in mice when combined to anti-PD-1 treatment, while each monotherapy failed. This synergistic effect relies on the ability of Folfox to induce tumor infiltration by activated PD-1

Keywords: CD8 T cells; PD-1/PD-L1 pathway; chemotherapy; colorectal cancer, adaptive immune resistance; immunotherapy

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