en Adults Hematology & Oncology Adults Hematology & Oncology متا آنالیز Meta-analysis <p style="text-align: justify;"><span style="line-height:2;"><span style="font-family:Arial;"><span style="font-size:14px;"><strong>Background:</strong> The diagnosis of B-cell acute lymphoblastic leukemia (B-ALL) on the basis of the World Health Organization (WHO) recommendations in 2016 requires the expression of CD19 with CD79a (CD79a), cCD22 and CD10. CD79a is an integral B cell antigen expressed at all stages. Its absence in B-ALL has only been rarely reported. In this study, we described three cases of B-ALL showing complete loss or extremely weak expression of CD79a.<br> <strong>Methods:</strong> Seventy-five patients with B-ALL diagnosed by flow cytometry over a period of 3.5 years were taken out from the records. Cases lacking for CD79a by flow cytometry were further analysed.<br> <strong>Results: </strong>Out of 75 cases, CD 79a negativity was seen in 4% (3/75). However, every three cases expressed other B cell markers. No aberrant expression of myeloid and lymphoid antigens was seen in any of these three cases. The prognosis of these three cases was similar to CD79a positive cases.<br> <strong>Conclusion: </strong>Rarely, B cell ALL may lack CD79a. Thus, to avoid the misdiagnosis, a comprehensive antibody panel should be used. There was no prognostic impact of CD79a negativity in this study, however larger studies are needed to confirm these results.</span></span></span></p> B-cell acute lymphoblastic leukemia, CD79a expression, Flow cytometry, Immunophenotyping, Prognosis 29 32 http://ijbc.ir/browse.php?a_code=A-10-586-1&slc_lang=en&sid=1 Neha Garg 10031947532846009004 10031947532846009004 No senior Resident, Department of Pathology, UCMS and GTBH Malvika Shastri 10031947532846009005 10031947532846009005 No Junior Resident,Department of Pathology, UCMS and GTBH Mrinalini kotru 10031947532846009006 10031947532846009006 No Professor, Department of Pathology, UCMS and GTBH Richa Gupta richagupta0209@gmail.com 10031947532846009007 10031947532846009007 Yes Professor, Department of Pathology, UCMS and GTBH