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Department of Dermatology, Vrije Universiteit Medical Center, 1081 HV Amsterdam, the Netherlands, and Department of Dermatology, Leiden University Medical Center, 2333 AL Leiden, the Netherlands
Defective apoptosis signaling has been implicated in the pathogenesis of primary cutaneous T-cell lymphomas (CTCLs), a group of malignancies derived from skin-homing T cells. An important mediator of apoptosis in T cells is the Fas receptor. We identified a novel splice variant of the Fas gene that displays retention of intron 5 and encodes a dysfunctional Fas protein in 13 of 22 patients (59%) in both early and advanced CTCL. Impairment of Fas-induced apoptosis resulting from aberrant splicing potentially contributes to the development and progression of CTCL by allowing continued clonal expansion of activated T cells and by reducing susceptibility to antitumor immune responses.
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