Abstract
Background: Chronic lymphocytic leukemia(CLL) is a monoclonal malignancy characterized by an accumulation of small and mature looking B lymphocytes in the blood, bone marrow and other tissues, and is typically characterized by expression CD5+, CD23+, CD22 -, CD79b-, with weak expression of surface immunoglobulin (sIg). Two major clinical staging systems (Rai and Binet staging), that developed to estimate prognosis in CLL. However both these systems are unable to prospectively distinguish the rapidly developing patients from those appreciated to remain with a stable disease for decades. Several publications reported the prognostic important of 13q deletion in patients with chronic lymphocytic leukemia. 13q deletion is the most important cytogenetic abnormalities detected by Fluorescence In situ Hybridization in CLL patients and represent a good prognostic marker with 60% of patients alive after 5 years as compared with 27% for patients with a normal FISH analysis. Aims of the study: To investigate 13q deletion in patients with chronic lymphocytic leukemia by using FISH technique. To correlate the presence of 13q deletion with hematological and clinical prognostic markers including complete blood picture, absolute lymphocyte count, and modified Rai staging.
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