Volume 126, Issue 11 pp. 2635-2643
Tumor Immunology

High frequency of tumor-infiltrating FOXP3+ regulatory T cells predicts improved survival in mismatch repair-proficient colorectal cancer patients

Daniel M. Frey

Corresponding Author

Daniel M. Frey

Department of Surgery, University Hospital of Basel, Basel, Switzerland

Daniel M. Frey and Raoul A. Droeser contributed equally to the study.

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Department of Surgery, University Hospital of Basel, Basel, SwitzerlandSearch for more papers by this author
Raoul A. Droeser

Raoul A. Droeser

Department of Surgery, University Hospital of Basel, Basel, Switzerland

Daniel M. Frey and Raoul A. Droeser contributed equally to the study.

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Carsten T. Viehl

Carsten T. Viehl

Department of Surgery, University Hospital of Basel, Basel, Switzerland

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Inti Zlobec

Inti Zlobec

Institute of Pathology, University Hospital of Basel, Basel, Switzerland

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Alessandro Lugli

Alessandro Lugli

Institute of Pathology, University Hospital of Basel, Basel, Switzerland

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Urs Zingg

Urs Zingg

Department of Surgery, University Hospital of Basel, Basel, Switzerland

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Daniel Oertli

Daniel Oertli

Department of Surgery, University Hospital of Basel, Basel, Switzerland

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Christoph Kettelhack

Christoph Kettelhack

Department of Surgery, University Hospital of Basel, Basel, Switzerland

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Luigi Terracciano

Luigi Terracciano

Institute of Pathology, University Hospital of Basel, Basel, Switzerland

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Luigi Tornillo

Luigi Tornillo

Institute of Pathology, University Hospital of Basel, Basel, Switzerland

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First published: 23 March 2010
Citations: 275

The authors declare that they have no financial competing interests.

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Abstract

Regulatory T cells (Treg) inhibit the generation of host-versus-tumor immunity via suppression of tumor-specific effector T-cell responses and development of immune tolerance to neoplastic cells. The transcription factor forkhead box P3 (FOXP3) is an intracellular key molecule for Treg development and function and is considered to represent the most specific Treg cell marker. The aim of this study was to analyze the frequency and prognostic impact of tumor-infiltrating FOXP3+ Treg in colorectal cancer (CRC) stratified by mismatch-repair (MMR) status. Using the tissue microarray technique, 1,420 tumor samples were immunohistochemically stained for FOXP3 and stratified into 1,197 MMR-proficient and 223 MMR-deficient CRCs. Additionally, the 1,197 MMR-proficient CRCs were randomized into 2 subgroups (Test Groups 1 and 2; n = 613 and 584, respectively). In both MMR-proficient CRC subgroups high frequency tumor-infiltrating FOXP3+ Treg was associated with early T stage (p = 0.001 and <0.001), tumor location (p = 0.01 and 0.045) and increased 5-year survival rate (p = 0.004 and <0.001), whereas in MMR-deficient CRCs an association between FOXP3+ Treg and absence of lymph node involvement (p = 0.023), absence of vascular invasion (p = 0.023) and improved 5-year survival rate (p = 0.029) could be detected. In a multivariable analysis including age, gender, T stage, N stage, tumor grade, vascular invasion, and tumor border configuration, a high FOXP3+ Treg frequency was an independent prognostic factor in both MMR-proficient CRC subsets (p = 0.019 and p = 0.007), but not in the MMR-deficient CRCs (p = 0.13). Therefore, high frequency of tumor-infiltrating FOXP3+ Treg is associated with early T stage and independently predicts improved disease-specific survival in MMR-proficient CRC patients.

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