Publication: Combinatorial Immunotherapy of Polyinosinic-Polycytidylic Acid and Blockade of Programmed Death-1 Induces Effective CD8 T Cell Responses against Established Tumors.

CitationNagato T, Lee YR, Harabuchi Y, Celis E. Combinatorial Immunotherapy of Polyinosinic-Polycytidylic Acid and Blockade of Programmed Death-1 Induces Effective CD8 T Cell Responses against Established Tumors.Clin Cancer Res. 2014 Jan 3. [Epub ahead of print] PMID:24389326

Abstract

PURPOSE:

Epitope-based cancer vaccines capable of inducing CD8 T cell responses to tumor-associated antigens (TAAs) expressed by tumor cells have been considered as attractive alternatives for the treatment of some types of cancer. However, reliable TAAs have not been identified for most malignant diseases, limiting the development of epitope-based vaccines. Herein, we report that the combinatorial therapy of polyinosinic-polycytidylic acid (poly-IC) and anti-programmed death-ligand 1 (PD-L1) monoclonal antibody (mAb) can be implemented with good results for tumors where no known TAAs have been identified.

EXPERIMENTAL DESIGN:

Three cancer mouse models (melanoma, lung, and colon) were used to evaluate therapeutic efficacy and examine the immunological mechanisms of the poly-IC/anti-PD-L1 mAb therapy.

RESULTS:

The combined administration of poly-IC and anti-PD-L1 mAb into tumor-bearing mice generated potent immune responses resulting in the complete eradication or remarkable reduction of tumor growth. In some instances, the poly-IC/anti-PD-L1 mAb therapy induced long-lasting protection against tumor rechallenges. The results indicate that CD8 T cells but not CD4 T cells or NK cells mediated the therapeutic efficacy of this combinatorial therapy. Experiments using genetically-deficient mice indicate that the therapeutic efficacy of this combinatorial therapy depended in part by the participation of type-I interferon, whereas interferon-ฮณ did not appear to play a major role.

CONCLUSIONS:

The overall results suggest that immunotherapy consisting of the combination of poly-IC/anti-PD-L1 mAb could be a promising new approach for treating cancer patients, especially those instances where no reliable TAAs are available as a therapeutic vaccine.

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Heather Hopkins

My work explores the relationship between the universality of myth and life as performance.

With influences as diverse as Machiavelli and Joni Mitchell, new combinations are generated from both explicit and implicit meanings.

Ever since I was a teenager I have been fascinated by the essential unreality of the zeitgeist. What starts out as yearning soon becomes corroded into a manifesto of professional courtesy, leaving only a sense of what could have been and the dawn of a new reality.

As momentary replicas become clarified through emergent and repetitive practice, the viewer is left with an epitaph for the outposts of our culture.

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Written by Heather Hopkins

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