Effective treatment with rituximab in a patient with refractory prolymphocytoid transformed B-chronic lymphocytic leukemia and Evans syndrome

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Abstract
A 65-year-old male who had been diagnosed as having chronic lymphocytic leukemia (CLL) stage Rai 0 three years previously presented in October 1998 with progressive disease (splenomegaly, increasing lymphocytosis: 30/nl) and 50% prolymphocytes in his peripheral blood. The patient was refractory to initial treatment with fludarabine and epirubicin, and 2-chlorodeoxyadenosine. Additionally, the patient developed Evans syndrome. Therapy with cyclophosphamide, vincristine, and prednisone lead to an improvement of hemolysis, but the patient remained thrombocytopenic. Subsequently, lymphocytes further increased to 135/nl, and cyclophosphamide 3 g/m2 was again given but without effect on the peripheral lymphocyte count. At this stage, therapy with rituximab 375 mg/m2 four times weekly was initiated. The platelet count normalized within 1 week after the first dose of rituximab, and the lymphocyte count dropped within 2 months to 1.1/nl. This case demonstrates that patients with prolymphocytoid transformed B-CLL refractory to purine analogs and alkylating agents and autoimmune-hemolytic disease can effectively and safely be treated with rituximab and indicates that an investigation of antibody therapy is warranted in this patient group.

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