Abstract
Fas-ligand (FasL) is a member of the tumor necrosis factor family and transmits apoptotic cell death signal by binding to its receptor, Fas. FasL is expressed on the cell surface of activated T-cell and natural killer (NK) cell. It has been shown that the FasL can be released from the cell surface by metalloproteinase. The serum soluble FasL (sFasL) is increased in some patients with NK cell lymphoma/large granular lymphocytic leukemia. We have recently seen a patient with recurrent B-cell lymphoma accompanied with an increased serum sFasL level after autologous peripheral blood stem cell transplantation. The sFasL was markedly decreased with the tumor regression induced by the chemotherapy. We present here the first case of an elevated serum sFasL level associated with B-cell lineage malignancy and discuss the possible clinical value of sFasL.
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