Prolonged survival in Richter syndrome with subsequent reemergence of CLL: A case report including serial cell‐surface phenotypic analysis

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Abstract
The development of a large cell lymphoma in a patient with chronic lymphocytic leukemia (Richter syndrome) is associated with a poor prognosis. There is dispute regarding the clonal origin of the large cell component. We described a patient in whom prolonged remission of the large cell component was achieved with combination chemotherapy, followed by subsequent reemergence of the less aggressive CLL clone. Serial cell surface phenotypic data are presented suggesting origin of both histologies from a common B-cell clone.