Study of immunophenotypic markers and clinico-hematological findings in chronic lymphocytic leukemia

Background and objective: Chronic lymphocytic leukemia (CLL) is a clonal, mature B-cell neoplasm, its clinical features, cell morphology, and immunophenotyping are used to establish the diagnosis. Immunophenotyping by flow cytometry is the most accurate procedure for diagnosing CLL, there is no single marker exclusively expressed in CLL, however, a complex of immunophenotypic markers that incorporates several B-cell markers and assists in differentiating CLL from other mature B-cell neoplasms, the expression of these immunophenotypic markers is considered in the specific CLL scoring system (Moreue scoring system).this study aimed to assess the clinico – hematological features and immunophenotypic characteristics of CLL patients and to assess the role of immunophenotyping in the differential diagnosis of CLL. Methods: an observational prospective and retrospective study was carried out at Nanakaly hospital for blood diseases and oncology in Erbil city, Iraq. That was conducted on 100 patients newly diagnosed with mature B cell neoplasm which included 68 cases of CLL and 32 cases with other mature B cell neoplasm (MBN), usinga convenience sampling method. The study period was from the1st of September 2021 to the end of April 2022. An interview questionnaire was used to collect the study data from the patients. Results: The mean of age ± standard deviation of the CLL patients (58.85 ± 10.69) years and (66.2%) was male, The most frequent clinical presentations for CLL cases were fatigue (50%), lymphadenopathy (41.2%), and splenomegaly (41.2%), (50%) of CLL patients had anemia, thrombocytopenia was seen in (32.4%) and leukocytosis was seen (98.5%), all patients had lymphocytosis and (97%) had an absolute B lymphocyte count of more than 5 x109 /L. all the studied CLL patients expressed both CD45 and CD19 markers, the expression of the immunophenotypic markers was as following: CD5 (98.5%), CD23 (97.1%) and CD200 (97.1%), Half of the patients (50%) showed expression of monoclonal lambda light chain, sIgM (4.4%), CD20 (88.2%) and CD43 (54.4%) and CD38 (26.5%). The expression of the following marker had a significant role in the differentiation between CLL and other MBN: CD5, CD23, CD79b, FMC7, sIgM, CD200, and CD43. Conclusion: Our results have shown that the clinical presentations and hematological profile of Iraqi CLL patients were not significantly different from that of previous local and global studies, the distinct immunophenotyping, as well as it has been found that immunophenotyping is a promising method for supporting the clinical and morphological characterization of CLL.