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Nat Commun. 2017 May 24;8:15221. doi: 10.1038/ncomms15221.

Induction of resident memory T cells enhances the efficacy of cancer vaccine.

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INSERM U970, Université Paris Descartes, Sorbonne Paris-Cité, 56 Rue Leblanc, Paris 75015, France.
Equipe Labellisée Ligue Contre le Cancer, Paris 75015, France.
Department of Pathology, Hopital Européen Georges Pompidou, 20 Rue Leblanc, Paris 75015, France.
Institute of Biomedical Sciences, University of Sao Paulo, Av Prof Lineu Prestes, Sao Paulo SP-CEP 05508-900, Brazil.
Institut Curie, PSL Research University, Chemical Biology of Membranes and Therapeutic Delivery Unit, INSERM U 1143, CNRS UMR3666, 26 Rue d'Ulm 75248, Paris Cedex 05, France.
Hopital Europeen Georges Pompidou, Chrirurgie Thoracique Générale, Oncologique et Transplantation, 20 Rue Leblanc, Paris 75015, France.
Department of Medical Bioinformatics, Hopital Européen Georges Pompidou, 20 Rue Leblanc, Paris 75015, France.
Departement of Medical Oncology, Hopital Européen Georges Pompidou, 20 Rue Leblanc, Paris 75015, France.


Tissue-resident memory T cells (Trm) represent a new subset of long-lived memory T cells that remain in tissue and do not recirculate. Although they are considered as early immune effectors in infectious diseases, their role in cancer immunosurveillance remains unknown. In a preclinical model of head and neck cancer, we show that intranasal vaccination with a mucosal vector, the B subunit of Shiga toxin, induces local Trm and inhibits tumour growth. As Trm do not recirculate, we demonstrate their crucial role in the efficacy of cancer vaccine with parabiosis experiments. Blockade of TFGβ decreases the induction of Trm after mucosal vaccine immunization, resulting in the lower efficacy of cancer vaccine. In order to extrapolate this role of Trm in humans, we show that the number of Trm correlates with a better overall survival in lung cancer in multivariate analysis. The induction of Trm may represent a new surrogate biomarker for the efficacy of cancer vaccine. This study also argues for the development of vaccine strategies designed to elicit them.

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