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Frequency of regulatory T cells in renal cell carcinoma patients and investigation of correlation with survival

Griffiths, RW, Elkord, E, Gilham, DE, Ramani, V, Clarke, N, Stern, PL and Hawkins, RE 2007, 'Frequency of regulatory T cells in renal cell carcinoma patients and investigation of correlation with survival' , Cancer Immunology, Immunotherapy, 56 (11) , pp. 1743-1753.

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Abstract

Regulatory T cells are important in maintaining immune homeostasis, mediating peripheral tolerance and preventing autoimmunity. Increased frequencies of CD4(+)CD25(high )T regulatory (T(Reg)) cells have been documented in the peripheral blood of patients with several types of cancer consistent with a role in tumour escape from immunological control. We have investigated the presence of T(Reg) cells systemically and in situ in previously untreated patients with renal cell carcinoma (RCC). RESULTS: We have shown that there is a significant increased frequency of CD4(+)CD25(high) T cells in RCC patients (n = 49) compared to normal donors (n = 38), respectively, 2.47% versus 1.50%; P < 0.0001. We confirmed these data using the FOXP3 marker of T(Reg) cells in a subset of these patients and normal donors. The population of T(Reg) cells identified showed the expected phenotype with CD4(+)CD25(high) population in both RCC patients and normal donors contained higher proportions of CD45RO and GITR than CD4(+)CD25(-/low) populations and exhibiting suppressive activity in an anti-CD3 and anti-CD28 induced proliferation assay. CD4(+)FOXP3(+) T cells were detected in the tumour microenvironment by immunofluorescence and the numbers enumerated in lymphocytes recovered following enzymatic disaggregations of biopsies; their frequency was higher in the tumour than the peripheral blood of the same patients. The early follow up data show an association between higher peripheral blood regulatory T-cell count and adverse overall survival. CONCLUSION: These data confirm the increase of T(Reg) cells in RCC patients and provide impetus to further investigate modulation of T(Reg) activity in RCC patients as part of therapy.

Item Type: Article
Themes: Health and Wellbeing
Schools: Colleges and Schools > College of Science & Technology > School of Environment and Life Sciences > Biomedical Research Centre
Colleges and Schools > College of Science & Technology > School of Environment and Life Sciences
Journal or Publication Title: Cancer Immunology, Immunotherapy
Publisher: Springer Verlag
Refereed: Yes
ISSN: 0340-7004
Depositing User: E Elkord
Date Deposited: 13 Oct 2011 09:40
Last Modified: 20 Aug 2013 17:13
URI: http://usir.salford.ac.uk/id/eprint/18284

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