The effect of extracorporeal photopheresis alone or in combination therapy on circulating CD4(+) Foxp3(+) CD25(-) T cells in patients with leukemic cutaneous T-cell lymphoma

Photodermatology, Photoimmunology & Photomedicine
Lisa H ShiueMadeleine A Duvic

Abstract

Extracorporeal photopheresis (ECP) alone or in combination therapy is effective for treatment of leukemic cutaneous T-cell lymphoma (L-CTCL), but its mechanism(s) of action remain unclear. This study was designed to investigate the effect of ECP on regulatory T cells and CD8(+) T cells in L-CTCL patients. Peripheral blood from 18 L-CTCL patients at baseline, Day 2, 1 month, 3 month, and 6 month post-ECP therapy was analyzed by flow cytometry for CD4(+) CD25(+/high) , CD4(+) Foxp3(+) CD25(+/-) , CD3(+) CD8(+) , CD3(+) CD8(+) CD69(+) , and CD3(+) CD8(+) IFN-γ(+) T cells. Clinical responses were assessed and correlated with changes in these T-cell subsets. Twelve of 18 patients achieved clinical responses. The average baseline number of CD4(+) CD25(+/high) T cells of PBMCs in L-CTCL patients was normal (2.2%), but increased at 6-month post-therapy (4.3%, P < 0.01). The average baseline number of CD4(+) Foxp3(+) T cells out of CD4(+) T cells in nine evaluable patients was high (66.8 ± 13.7%), mostly CD25 negative. The levels of CD4(+) Foxp3(+) T cells in responders were higher (n = 6, 93.1 ± 5.7%) than nonresponders (n = 3, 14.2 ± 16.0%, P < 0.01), and they declined in parallel with malignant T cells. The numbers of CD3(+) CD8(+) C...Continue Reading

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Citations

Jun 21, 2016·Journal of Clinical Apheresis
Dec 6, 2017·Cancer Immunology, Immunotherapy : CII·Larisa J GeskinLouis D Falo
Oct 8, 2020·Journal of the European Academy of Dermatology and Venereology : JEADV·R KnoblerH Greinix

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