Characterization of CD4+CD25+ regulatory T cells in patients treated with high-dose interleukin-2 for metastatic melanoma or renal cell carcinoma

Journal of Clinical Oncology : Official Journal of the American Society of Clinical Oncology
Giovanni C CesanaHoward L Kaufman

Abstract

To characterize the number and functional status of CD4+CD25+ regulatory T cells (Tregs) in patients with metastatic melanoma (MM) and renal cell carcinoma (RCC) treated with high-dose bolus interleukin-2 (IL-2). Patients with MM or RCC treated with high-dose bolus IL-2 (600,000 IU/kg every 8 hours) at a single center provided pre- and post-treatment whole blood specimens. Peripheral blood mononuclear cells were isolated by Ficoll density gradient centrifugation, separated into cellular subsets, and analyzed by flow cytometry or used for in vitro proliferation assays. Between September 2003 and July 2005 57 patients were enrolled in the study with 48 patients available for analysis (45 MM, 12 RCC). Tregs were defined as CD4+CD25(hi) T cells, and this subset was significantly elevated in the cancer patients compared with normal donors (7.75% v 2.24%). The CD4(+)CD25(hi) T-cell pool in the patients constitutively expressed intracellular FoxP3, CTLA-4, and produced high amounts of IL-10. The Tregs were CCR7+ with 50% representing naïve and 50% central-memory T cells. The cells were functionally suppressive in mixed in vitro proliferation assays. Following IL-2 administration, the number and frequency of Tregs increased in patients...Continue Reading

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