Volume 129, Issue 2 pp. 507-512
Short Report

Sorafenib reduces the percentage of tumour infiltrating regulatory T cells in renal cell carcinoma patients

Ingrid M.E. Desar

Ingrid M.E. Desar

Department of Medical Oncology, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands

I.M.E.D., J.F.M.J., V.M.L. van H. and I.J.M. de V contributed equally.

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J. (Hans) F.M. Jacobs

J. (Hans) F.M. Jacobs

Department of Medical Oncology, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands

Department of Tumour Immunology, Nijmegen Centre for Molecular Life Sciences, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands

Laboratory of Medical Immunology, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands

I.M.E.D., J.F.M.J., V.M.L. van H. and I.J.M. de V contributed equally.

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Christina A. Hulsbergen-vandeKaa

Christina A. Hulsbergen-vandeKaa

Department of Pathology, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands

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Wim J.G. Oyen

Wim J.G. Oyen

Department of Nuclear Medicine, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands

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Peter F.A. Mulders

Peter F.A. Mulders

Department of Urology, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands

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Winette T.A. van der Graaf

Winette T.A. van der Graaf

Department of Medical Oncology, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands

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Gosse J. Adema

Gosse J. Adema

Department of Tumour Immunology, Nijmegen Centre for Molecular Life Sciences, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands

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Carla M.L. van Herpen

Carla M.L. van Herpen

Department of Medical Oncology, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands

I.M.E.D., J.F.M.J., V.M.L. van H. and I.J.M. de V contributed equally.

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I. (Jolanda) J.M. de Vries

Corresponding Author

I. (Jolanda) J.M. de Vries

Department of Medical Oncology, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands

Department of Tumour Immunology, Nijmegen Centre for Molecular Life Sciences, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands

Department of Pediatric Hemato-Oncology, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands

I.M.E.D., J.F.M.J., V.M.L. van H. and I.J.M. de V contributed equally.

Tel.: 0031 24 3617600, Fax: 31-24-3540339

NCMLS, TIL 278, Radboud University Nijmegen Medical Centre, PO Box 9101, 6500 HB Nijmegen, The NetherlandsSearch for more papers by this author
First published: 13 September 2010
Citations: 117

Tel.: 0031 24 3617600, Fax: 31-24-3540339

Abstract

Tyrosine kinase inhibitors (TKIs) as sorafenib are known to reduce the number of immunosuppressive regulatory T cells (Tregs) in the peripheral blood and thereby shifting the immune balance to a more stimulating setting. The effect of sorafenib on intratumoural Tregs is unclear but important for future combinations of TKIs and immunotherapy. We, therefore, evaluated the accumulation of regulatory T cells (Tregs, defined as, CD4+FoxP3+CD25highCD127low-cells) in blood, ascites, metastases and primary tumours of patients with renal cell carcinoma (RCC), and we explored the effect of neoadjuvant treatment with sorafenib 400 mg bid on intratumoural Tregs in 11 patients with RCC in comparison to 15 nontreated RCC patients. We found that immunosuppressive Tregs specifically accumulate in primary tumour, metastases and ascites of RCC-patients. Tumour infiltrating Tregs were functional. Neoadjuvant sorafenib treatment significantly reduced the percentage of tumour-infiltrating Tregs (mean 17.3% vs. 28.1%, p = 0.046). Diminished Treg accumulation at the tumour site adds to explain the clinical effectiveness of sorafenib treatment. This observation may have important implications for the use of sorafenib in combination with immunotherapy in patients with RCC, since the depletion of Tregs has been associated with enhanced responses on vaccine mediated immunotherapy.

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