Abstract
Adult T-cell leukaemia/lymphoma (ATLL) is an aggressive neoplastic disease that usually exhibits a CD4(+)CD25(+) phenotype. Regulatory T cells (Treg), which suppress T-cell effector function, are characterized by the co-expression of CD4 and CD25. We analysed the expression of forkhead/winged helix transcription factor (FoxP3), a specific marker that is important for the function of Treg, on ATLL cells from 17 patients (peripheral blood, n = 8; lymph node, n = 9). Real-time polymerase chain reaction and immunostaining detected FoxP3 expression in 10 ATLL cases, but was relatively down-regulated compared with Treg from normal subjects. These results indicate the association of ATLL and Treg.
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