RT Book, Section A1 Amrein, Philip C. A2 Chabner, Bruce A. A2 Longo, Dan L. SR Print(0) ID 1127647973 T1 Chronic Lymphocytic Leukemia/Small Lymphocytic Lymphoma T2 Harrison's Manual of Oncology, 2e YR 2016 FD 2016 PB McGraw-Hill Education PP New York, NY SN 9780071793254 LK hemonc.mhmedical.com/content.aspx?aid=1127647973 RD 2024/04/23 AB Chronic lymphocytic leukemia (CLL) is a neoplastic disease characterized by the accumulation of monoclonal lymphocytes in blood, bone marrow, and lymphoid tissues. These lymphocytes are small, mature-appearing B cells typically expressing CD19, CD5, and CD23. It is generally a disease of older people and prognosis ranges widely from a few years to many years, but it is not considered curable outside of the bone marrow transplant setting. At times these neoplastic cells predominate in lymph nodes leading to the classification as a lymphoma. Hence, the WHO in 2008 has defined this neoplasm as chronic lymphocytic leukemia/small lymphocytic lymphoma (CLL/SLL) (1).