ISSN 2997-1036
International Journal of Hematology | Vol. 4, No. 3, March 2013 | pp. 17–24
DOI: 10.46882/2013/IJH/000039
Original Article
Title: Evaluation of a modified Matutes scoring system for the diagnosis of chronic lymphocytic leukemia
Names of Authors: W. A. Adebayo¹, X. Y. Emeka², Z. Z. Salami³
Authors’ Affiliations: ¹Department of Haematology, University of Ibadan, Ibadan, Nigeria; ²Department of Haematology, University of Calabar Teaching Hospital, Calabar, Nigeria; ³Department of Pathology, Lagos University Teaching Hospital, Lagos, Nigeria
Abstract: The Matutes scoring system distinguishes chronic lymphocytic leukemia from other mature B-cell lymphoproliferative disorders based on a five-marker immunophenotype. This study evaluated the diagnostic performance of a modified scoring system substituting CD200 for FMC7 in 50 patients presenting with persistent B-cell lymphocytosis. Multiparameter flow cytometry quantified expression of CD5, CD23, CD22, CD200, and surface light chain intensity. Chronic lymphocytic leukemia was confirmed in 38 cases based on clinical and histological features. The classic Matutes score (using FMC7) yielded a sensitivity of 89.4% and a specificity of 83.3%. In contrast, the modified score incorporating CD200 achieved a sensitivity of 97.3% and a specificity of 91.6% (P < 0.05). CD200 was strongly and uniformly expressed in all 38 chronic lymphocytic leukemia cases, whereas it was entirely absent or weakly expressed in mantle cell lymphoma and splenic marginal zone lymphoma cohorts. Incorporating CD200 into the immunophenotypic protocol significantly improves diagnostic accuracy, reducing borderline scores and helping differentiate chronic lymphocytic leukemia from more aggressive B-cell lymphomas.
Keywords: Chronic lymphocytic leukemia, Matutes score, CD200, flow cytometry, immunophenotyping
Manuscript Timeline: Received: December 05, 2012; Revised: January 14, 2013; Accepted: February 02, 2013; Published: March 12, 2013