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Activated regulatory and memory T-cells accumulate in malignant ascites from ovarian carcinoma patients

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Abstract

Invasive ovarian cancer is associated with poor outcome. The presence of infiltrating regulatory T-cells (Tregs) suppresses protective anti-tumor immune responses, and their accumulation into the tumor microenvironment correlates with reduced survival in ovarian cancer patients. Here, we conducted a detailed characterization of CD4+ T-cells, CD8+ T-cells and Treg subsets in the peripheral blood and malignant ascites fluid from seventeen patients with ovarian carcinoma of epithelial origin. Cell distribution, activation status and proliferation status were assessed by multi-color flow cytometry. In ascites fluid, a significant accumulation of CD8+ cytotoxic T-cells and Tregs was observed compared to peripheral blood. Furthermore, a skewing toward the CD45RA effector/memory compartment was observed in all T-cell subsets in the ascites fluid, but was most pronounced in the Treg population. Regulatory T-cells in the malignant ascites were more activated and had a higher proliferation rate compared to blood-derived cells from the same patient, and their number in ascites was positively correlated with the number of epithelial cells in effusion. In summary, we demonstrate an accumulation of activated CD4+, CD8+ and regulatory T-cells in the cancer microenvironment of ovarian carcinoma.

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Abbreviations

CCL17:

Chemokine (C–C motif) ligand 17

CCL22:

Chemokine (C–C motive) ligand 22

CCR4:

Chemokine (C–C motive) receptor 4

CTLA4:

Cytotoxic T-lymphocyte-associated protein 4

EpCAM:

Epithelial cell adhesion molecule

FIGO:

International Federation of Gynaecology and Obstetrics

FoxP3:

Forkhead box P3

IDO:

Indoleamine 2,3-dioxygenase

Ki-67:

Marker of proliferation Ki-67

MHC:

Major histocompatibility complex

PBMC:

Peripheral blood mononuclear cells

PBS:

Phosphate buffered saline

PD1:

Programmed cell death 1

TALs:

Tumor-associated lymphocytes

TILs:

Tumor-infiltrating lymphocytes

Treg:

Regulatory T-cell

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Acknowledgments

We thank the pathologists from the Department of Pathology, The Gade Institute, Haukeland University Hospital, Bergen, Norway for routine histopathological diagnosis of the tumor specimens. Furthermore, we thank Isabelle Cornez, Kristoffer W. Brudvik and Simer J. Bains for help with processing samples for subsequent analysis. This work was supported by the Research Council of Norway, the Norwegian Cancer Society, the Kristian Gerhard Jebsen Foundation and Anders Jahre’s Foundation.

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The authors declare no conflict of interest.

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Correspondence to Kjetil Taskén.

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Landskron, J., Helland, Ø., Torgersen, K.M. et al. Activated regulatory and memory T-cells accumulate in malignant ascites from ovarian carcinoma patients. Cancer Immunol Immunother 64, 337–347 (2015). https://doi.org/10.1007/s00262-014-1636-6

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  • DOI: https://doi.org/10.1007/s00262-014-1636-6

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