• Muhammad Zain Arshad, Muhammad Aftab Hassan, Maryam Bibi, Muhammad Hussain, Mustajab Alam, and Muhammad Omair Riaz.
• Department of Immunology, Armed Forces Institute of Pathology, National University of Medical Sciences, Rawalpindi, Pakistan.
• J Coll Physicians Surg Pak. 2024 May 1; 34 (5): 539544539-544.

ObjectiveTo determine the frequency of different types of acute leukaemia and their subtypes along with associated aberrant CD markers.Study DesignDescriptive study. Place and Duration of the Study: Department of Immunology Armed Forces Institute of Pathology, National University of Medical Sciences, Rawalpindi, Pakistan, from November 2021 to October 2023.MethodologyAll samples received for flow cytometric immunophenotyping with suspicion of acute leukaemia were included in the study. Cells were stained with fluorochrome labelled monoclonal antibodies against lineage-specific cluster of differentiation (CD) markers through a lyse-wash procedure. Acquisition and analysis were done using multi-parameter BD FACS Canto II Flow cytometer and BD FACS Diva software, respectively. Data were entered and analysed using SPSS v 23.0.ResultsOver a period of 2 years, a total of 1,115 suspected patients were tested for acute leukaemia. Among them, 728 (65.3%) were males and 387 (34.7%) were females, with mean age 28 ± 21 years, ranging from 1 week to 87 years. Among a total of 875/1115 (78.5%) diagnosed cases of acute leukaemia, AML was the most common leukaemia present in 408/875 (46.6%) patients followed by B-ALL and T-ALL in 384/875 (43.8%) and 70/87 (8%) patients, respectively (p = 0.5712). Aberrant CD markers were detected in 109/875 (12.5%) leukaemias (p = 0.0628). The most common aberrant CD markers in B-ALL were CD13 and CD33 present in 30/384 (7.8%) cases separately. Among AML and T-ALL most common aberrant CD markers were CD7 and CD33 present in 25/408 (6.13%) and 7/70 (10%) cases, respectively.ConclusionSpecial consideration should be given to the presence of aberrant CD markers when assigning lineages to acute leukaemias. They may be important diagnostic, prognostic, and management tools for institution of immunotherapy.Key WordsAberrant CD markers, Acute leukaemia, CD Markers, Flow cytometry, Immunophenotyping.

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