Chronic lymphocytic leukemia

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Abstract
Significant strides have been made in our understanding of the biology and treatment of B cell chronic lymphocytic leukemia. Recent studies have defined cytogenetic and molecular lesions that may be responsible for leukemogenesis or disease progression. Molecular analyses of immunoglobulin genes have delineated two or more subgroups of chronic lymphocytic leukemia that may differ in their clinical behavior. Research in the biochemistry of chronic lymphocytic leukemia has provided insight into the noted resistance of leukemia cells to cytotoxic drugs. Investigations into the immunology has revealed mechanisms whereby chronic lymphocytic leukemia cells can contribute to the immune deficiency that commonly develops in patients with this disease. Clinical studies have delineated factors that are helpful in predicting prognosis and have provided data on promising new therapies for patients with this disease, including stem cell transplantation, monoclonal antibodies, and gene therapy.