Oncotarget

Research Papers:

Accumulation of FOXP3+T-cells in the tumor microenvironment is associated with an epithelial-mesenchymal-transition-type tumor budding phenotype and is an independent prognostic factor in surgically resected pancreatic ductal adenocarcinoma

Martin Wartenberg _, Inti Zlobec, Aurel Perren, Viktor Hendrik Koelzer, Beat Gloor, Alessandro Lugli and Eva Karamitopoulou

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Oncotarget. 2015; 6:4190-4201. https://doi.org/10.18632/oncotarget.2775

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Abstract

Martin Wartenberg1,2, Inti Zlobec2, Aurel Perren1,2, Viktor Hendrik Koelzer1,2, Beat Gloor3, Alessandro Lugli1,2, Eva Karamitopoulou1,2

1Clinical Pathology Division, University of Bern, Bern, CH-3010, Switzerland

2Translational Research Unit, Institute of Pathology, University of Bern, Bern, CH-3010, Switzerland

3Department of Visceral Surgery, Insel University Hospital, Bern, CH-3010, Switzerland

Correspondence to:

Eva Karamitopoulou, e-mail: eva.diamantis@pathology.unibe.ch

Keywords: FOXP3, CD8, Tumor-associated macrophages, pancreatic cancer, prognosis, immune cell infiltration, epithelial mesenchymal transition, tumor budding, tumor microenvironment

Received: August 28, 2014     Accepted: November 18, 2014     Published: February 10, 2015

ABSTRACT

Here we explore the role of the interplay between host immune response and epithelial-mesenchymal-transition (EMT)-Type tumor-budding on the outcome of pancreatic adenocarcinoma (PDAC).

CD4+, CD8+, and FOXP3+T-cells as well as iNOS+ (M1) and CD163+- macrophages (M2) were assessed on multipunch tissue-microarrays containing 120 well-characterized PDACs, precursor lesions (PanINs) and corresponding normal tissue. Counts were normalized for the percentage of tumor/spot and associated with the clinico-pathological features, including peritumoral (PTB) and intratumoral (ITB) EMT-Type tumor-budding and outcome.

Increased FOXP3+T-cell-counts and CD163-macrophages and decreased CD8+T-cell-counts were observed in PDACs compared with normal tissues and PanINs (p < 0.0001). Increased peritumoral FOXP3+T-cell-counts correlated significantly with venous invasion, distant metastasis, R1-status, high-grade ITB, PTB and independently with reduced survival. Increased intratumoral FOXP3+T-cells correlated with lymphatic invasion, N1-stage, PTB and marginally with adverse outcome. High peritumoral CD163-counts correlated with venous invasion, PTB and ITB. High intratumoral CD163-counts correlated with higher T-stage and PTB.

PDAC-microenvironment displays a tumor-favoring immune-cell composition especially in the immediate environment of the tumor-buds that promotes further growth and indicates a close interaction of the immune response with the EMT-process. Increased peritumoral FOXP3+T-cell density is identified as an independent adverse prognostic factor in PDAC. Patients with phenotypically aggressive PDACs may profit from targeted immunotherapy against FOXP3.


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