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Oncoimmunology. 2017 Jul 13;6(10):e1347742. doi: 10.1080/2162402X.2017.1347742. eCollection 2017.

Distinctive features of tumor-infiltrating γδ T lymphocytes in human colorectal cancer.

Author information

1
Central Laboratory of Advanced Diagnosis and Biomedical Research (CLADIBIOR), University of Palermo, Palermo, Italy.
2
Department of Biopathology and Medical Biotechnologies (DIBIMED), University of Palermo, Palermo, Italy.
3
Centre de Recherches en Cancérologie de Toulouse (CRCT), Toulouse, France.
4
Department of Medicine, University of Palermo, Palermo, Italy.
5
Department of Surgical and Oncological Sciences, University of Palermo, Palermo, Italy.

Abstract

γδ T cells usually infiltrate many different types of cancer, but it is unclear whether they inhibit or promote tumor progression. Moreover, properties of tumor-infiltrating γδ T cells and those in the corresponding normal tissue remain largely unknown. Here we have studied features of γδ T cells in colorectal cancer, normal colon tissue and peripheral blood, and correlated their levels with clinicopathologic hallmarks. Flow cytometry and transcriptome analyses showed that the tumor comprised a highly variable rate of TILs (5-90%) and 4% γδ T cells on average, with the majority expressing Vδ1. Most Vδ1 and Vδ2 T cells showed a predominant effector memory phenotype and had reduced production of IFN- γ which was likely due to yet unidentified inhibitory molecules present in cancer stem cell secretome. Transcriptome analyses revealed that patients containing abundant γδ T cells had significantly longer 5-year disease free survival rate, suggesting their efficacy in controlling tumor at very early stage.

KEYWORDS:

DFS; IFN-γ; TILs; colon cancer; γδ T cells

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