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Gupta N, Pawar R, Banerjee S, Brahma S, Rath A, Shewale S, Parihar M, Singh M, Arun SR, Krishnan S, Bhatacharyya A, Das A, Kumar J, Bhave S, Radhakrishnan V, Nair R, Chandy M, Arora N, Mishra D. Spectrum and Immunophenotypic Profile of Acute Leukemia: A Tertiary Center Flow Cytometry Experience. Mediterr J Hematol Infect Dis 2019; 11:e2019017. [PMID: 30858955 PMCID: PMC6402547 DOI: 10.4084/mjhid.2019.017] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2018] [Accepted: 01/19/2019] [Indexed: 01/09/2023] Open
Abstract
BACKGROUND For diagnosis, sub-categorization and follow up of Acute Leukemia (AL), phenotypic analysis using flow cytometry is mandatory. MATERIAL AND METHODS We retrospectively analyzed immunophenotypic data along with cytogenetics/molecular genetics data (wherever available) from 631 consecutive cases of AL diagnosed at our flow cytometry laboratory from January 2014 to August 2017. RESULTS Of the total 631 cases, 52.9% (n=334) were acute lymphoblastic leukemia (ALL), 43.9% (n=277) acute myeloid leukemia (AML), 2.2% (n=14) mixed phenotypic acute leukemia (MPAL), 0.5% (n=3) acute undifferentiated leukemia (AUL) and 0.5% (n=3) chronic myeloid leukemia in blast crisis (CML-BC). ALL cases comprised of 81.7% (n=273/334) B-cell ALLs (95.2%, n=260/273 common B-ALLs and 4.8%, n=13/273 Pro B-ALLs). CD13 was the commonest cross lineage antigen, expressed in B-ALL (25.6%, n=70/273), followed by CD33 (17.9%, n=49) and combined CD13/CD33 (11.3%, n=31/273) expression. T-ALLs constituted 18.3% (n=61/334) of total ALLs and included 27.9% (n=17/61) cortical T- ALLs. CD13 was commonest (32.7%, n=20/61) aberrantly expressed antigen in T-ALLs, followed by CD117 (19.1%, n=9/47). AML cases included 32.1% (n=89/277) AML with recurrent genetic abnormalities, 9.0% (n=25/277) with FLT3/NPM1c mutation and 58.9% (n=163/277) AML NOS including 14.7% (n=24/163) AML M4/M5, 1.8% (n=3/163) AML M6 and 3.7% (n=6/163) AML M7. In AMLs, CD19 aberrancy was the most common (20.2%, n=56/277) followed by CD56 (15.8%, n=42/265). CONCLUSIONS In this study, we document the spectrum, correlate the immunophenotype with genetic data of all leukemias, especially concerning T-ALL where the data from India is scarce.
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Affiliation(s)
- Nishit Gupta
- Department of Laboratory Hematology, Tata Medical Center, Kolkata
| | - Ravikiran Pawar
- Department of Laboratory Hematology, Tata Medical Center, Kolkata
| | | | - Subhajit Brahma
- Department of Laboratory Hematology, Tata Medical Center, Kolkata
| | - Asish Rath
- Department of Laboratory Hematology, Tata Medical Center, Kolkata
| | - Sundar Shewale
- Department of Laboratory Hematology, Tata Medical Center, Kolkata
| | - Mayur Parihar
- Department of Laboratory Hematology and Cytogenetics, Tata Medical Center, Kolkata
| | - Manish Singh
- Department of Laboratory Hematology and Cytogenetics, Tata Medical Center, Kolkata
| | - S R Arun
- Department of Laboratory Hematology and Cytogenetics, Tata Medical Center, Kolkata
| | | | | | - Anirban Das
- Department of Pediatric Oncology, Tata Medical Center, Kolkata
| | - Jeevan Kumar
- Department of Clinical Hematology, Tata Medical Center, Kolkata
| | - Saurabh Bhave
- Department of Clinical Hematology, Tata Medical Center, Kolkata
| | | | - Reena Nair
- Department of Clinical Hematology, Tata Medical Center, Kolkata
| | - Mammen Chandy
- Department of Clinical Hematology, Tata Medical Center, Kolkata
| | - Neeraj Arora
- Department of Laboratory Hematology and Molecular Genetics, Tata Medical Center, Kolkata
| | - Deepak Mishra
- Department of Laboratory Hematology and Molecular Genetics, Tata Medical Center, Kolkata
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Selection and Characterization of Single-Stranded DNA Aptamers Binding Human B-Cell Surface Protein CD20 by Cell-SELEX. Molecules 2018; 23:molecules23040715. [PMID: 29561802 PMCID: PMC6017093 DOI: 10.3390/molecules23040715] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2018] [Revised: 03/09/2018] [Accepted: 03/12/2018] [Indexed: 11/17/2022] Open
Abstract
The B-lymphocyte antigen (CD20) is a suitable target for single-stranded (ss) nucleic acid oligomer (aptamers). The aim of study was selection and characterization of a ssDNA aptamer against CD20 using Cell-Systematic Evolution of Ligands by Exponential Enrichment (Cell-SELEX). The cDNA clone of CD20 (pcDNA-CD20) was transfected to human embryonic kidney (HEK293T) cells. Ten rounds of Cell-SELEX was performed on recombinant HEK-CD20 cells. The final eluted ssDNA pool was amplified and ligated in T/A vector for cloning. The plasmids of positive clones were extracted, sequenced and the secondary structures of the aptamers predicted using DNAMAN® software. The sequencing results revealed 10 different types; three of them had the highest thermodynamic stability, named AP-1, AP-2 and AP-3. The AP-1 aptamer was the most thermodynamically stable one (ΔGAP-1 = −10.87 kcal/mol) with the highest binding affinity to CD20 (96.91 ± 4.5 nM). Since, the CD20 is a suitable target for recognition of B-Cell. The selected aptamers could be comparable to antibodies with many advantages. The AP-1, AP-2 and AP-3 could be candidate instead of antibodies for diagnostic and therapeutic applications in immune deficiency, autoimmune diseases, leukemia and lymphoma.
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Jalal SD, Al-Allawi NAS, Al Doski AAS. Immunophenotypic aberrancies in acute lymphoblastic leukemia from 282 Iraqi patients. Int J Lab Hematol 2017; 39:625-632. [PMID: 28722319 DOI: 10.1111/ijlh.12716] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2016] [Accepted: 06/19/2017] [Indexed: 01/11/2023]
Abstract
INTRODUCTION The identification of aberrancies in leukemia-associated immunophenotype (LAIP) of acute lymphoblastic leukemia (ALL) is quite important in the assessment of minimal residual disease (MRD). This study, the first from Iraq, aimed to assess the frequency and patterns of LAIP among Iraqi patients with ALL, to establish future strategies for evaluating MRD. METHODS A total of 282 newly diagnosed Iraqi ALL cases were analyzed with six-parameter flow cytometry using a panel of 29 monoclonal antibodies. RESULTS Immunological subtyping revealed that 85.5% of cases were B-ALL and the remainder T-ALL. LAIP was detected in 97.1% of B-ALL, and in 26.8% of T-ALL. The asynchronous maturation-associated antigen patterns in B-ALL were CD10strong+ /TdTdim+ , CD38dim+ /CD34+ , CD10dim+ /CD34+ , CD10strong /CD20strong+ , CD20strong+ /CD34+, and CD45dim+ /CD20strong+ in 84.6%, while the cross-lineage myeloid expression was seen in 81.3% and aberrant T-cell antigen expression in 6.2%. For T-ALL, asynchronous maturation-associated antigen patterns included the following: CD1a+ /CD5+ /sCD3+ and CD34+ /sCD3+ in 12.2%. Myeloid and B-cell antigen expression were each identified in 7.3% of T-ALL. No significant differences in LAIP were found between children and adults. CONCLUSION The high rates and the patterns of LAIP particularly in Iraqi B-ALL patients may allow the development of more cost-effective strategies for MRD monitoring.
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Affiliation(s)
- S D Jalal
- Department of Pathology, College of Medicine, University of Sulaimani, Sulaimani, Iraq
| | - N A S Al-Allawi
- Department of Pathology, College of Medicine, University of Duhok, Duhok, Iraq
| | - A A S Al Doski
- Department of Pathology, College of Medicine, University of Duhok, Duhok, Iraq
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