Abstract
Natural killer (NK) cell malignancies have been associated with neutropenia and disturbances of liver function tests, thought to be related to high levels of soluble Fas ligand (FasL) in the circulation. We report a case of fulminant hepatitis occurring 3 weeks after the initiation of salvage therapy by arginine butyrate and ganciclovir for refractory Epstein-Barr virus–positive NK cell lymphoma. Pathologic examination revealed disappearance of the NK tumor and massive liver injury caused by apoptosis of virtually all hepatocytes. Immunohistochemistry revealed an intense staining for FasL. To our knowledge, this is the first description of the occurence of FasLmediated lethal hepatitis after lysis of a NK cell lymphoma.
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