T-.GAMMA. .DELTA. Large Granular Lymphocyte Leukemia Preceded by Pure Red Cell Aplasia and Complicated with Hemophagocytic Syndrome Caused by Epstein-Barr Virus Infection

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Abstract
A 51-year-old man developed anemia, and was diagnosed with pure red cell aplasia through the absence of erythroid progenitors. Initially, he was treated with cyclosporine and prednisolone for 6 months but they were ineffective. Large granular lymphocyte (LGL) leukemia with the T-cell γ δ phenotype evolved after 6 months showing CD2+, CD3+, CD8- and CD56- with the T-cell receptor β gene rearrangement, clonalities of γ and δ genes and complex chromosome abnormality simultaneously with hemophagocytic syndrome (HPS). Epstein-Barr virus (EBV) genomic DNA was detected in the bone marrow cells. Administration of bolus methylprednisolone was ineffective, and the patient died one month later. In the present patient, it seemed that lymphoproliferative disease of large granular lymphocytes (LDGL) manifested initially as PRCA, γδ LGL leukemia evolved, and finally fatal HPS become complicated, presumably caused by the EBV reactivation in the immunodeficiency state with the administration of immunosuppressants.