A 59-year-old male with lymphocytosis and thrombocytopenia was asymptomatic without lymphadenopathy or hepatosplenomegaly over 10 years. He was admitted to our hospital because his thrombocytopenia had worsened. The clonal lymphocytes appeared as regular small mature lymphocytes on blood films, and bone marrow biopsy showed diffuse infiltration of mature lymphocytes. However, megakaryocytes also presented. The immunophenotypic analysis by flow cytometry revealed that the lymphocytes were positive for CD19, CD20, CD22, and surface membrane immunoglobulin (SmIg) M and D-lambda and were negative for CD5, CD10, CD11c, CD23, and other lineage markers. Expression levels of CD20 and SmIg were strong. The markers were consistent with CD5- CLL with autoimmune thrombocytopenia. He received rituximab, and a rapid decrease of lymphocytes with concomitant increase of platelets was observed. A few cases of CD5- CLL with a stable clinical course have been reported, thought to be B lymphocytosis of undetermined significance (MLUS). This is the first report of CD5- CLL with indolent clinical course associated with autoimmune thrombocytopenia, successfully treated with rituximab.
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