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Tembhare PR, Marti G, Wiestner A, Degheidy H, Farooqui M, Kreitman RJ, Jasper GA, Yuan CM, Liewehr D, Venzon D, Stetler-Stevenson M. Quantification of expression of antigens targeted by antibody-based therapy in chronic lymphocytic leukemia. Am J Clin Pathol 2013; 140:813-8. [PMID: 24225748 DOI: 10.1309/ajcpyfq4xmgjd6ti] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
OBJECTIVES Anti-CD20 (rituximab), anti-CD52 (alemtuzumab), anti-CD22 (BL22, HA22), and anti-CD25 (Oncotac) are therapeutic options that are the mainstay or in preclinical development for the treatment of chronic lymphocytic leukemia (CLL). Studies suggest that levels of surface antigen expression may affect response to monoclonal antibody-based therapy. METHODS Using the flow cytometric Quantibrite method (BD Biosciences, San Jose, CA) to determine antibodies bound per cell, we quantified the levels of surface expression of CD20, CD22, CD25, and CD52 in CLL cells from 28 untreated patients. RESULTS The CLL cells in all cases expressed CD20, CD22, and CD52 but 4 (14%) cases were negative for CD25. Although the ranking of levels of expression from highest to lowest was CD52, CD20, CD22, and CD25, the level of antigen expression on any specific case could not be accurately predicted. CONCLUSIONS Quantification of antigens might be useful in evaluating new antigens to target for therapy and may provide a systematic approach to selecting individualized therapy in CLL.
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Affiliation(s)
- Prashant R. Tembhare
- Flow Cytometry Unit, Laboratory of Pathology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD
| | - Gerald Marti
- Center for Biologics Evaluation and Research, Food and Drug Administration, Silver Spring, MD
| | - Adrian Wiestner
- Hematology Branch, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD
| | - Heba Degheidy
- Center for Biologics Evaluation and Research, Food and Drug Administration, Silver Spring, MD
| | - Mohammed Farooqui
- Hematology Branch, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD
| | - Robert J. Kreitman
- Laboratory of Molecular Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD
| | - Gregory A. Jasper
- Flow Cytometry Unit, Laboratory of Pathology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD
| | - Constance M. Yuan
- Flow Cytometry Unit, Laboratory of Pathology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD
| | - David Liewehr
- Biostatistics and Data Management Section, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD
| | - David Venzon
- Biostatistics and Data Management Section, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD
| | - Maryalice Stetler-Stevenson
- Flow Cytometry Unit, Laboratory of Pathology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD
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Wang L, Abbasi F, Jasper GA, Kreitman RJ, Liewehr DJ, Marti GE, Stetler-Stevenson M. Variables in the quantification of CD4 in normals and hairy cell leukemia patients. Cytometry B Clin Cytom 2011; 80:51-6. [PMID: 20687201 DOI: 10.1002/cyto.b.20541] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
BACKGROUND Quantitative flow cytometry (QFCM) is being applied in the clinical flow cytometry laboratory. Quantitative normal T-cell CD4 expression represents a biologic standard and quality control agent. However, low levels of CD4 expression were detected in normal T-cells in Hairy Cell Leukemia (HCL) samples. METHODS The QuantiBrite System® was used to determine the level of CD4 expression (mean antibody bound per cell, ABC) in fresh and shipped HCL blood and fresh normal donor blood (NDB). The effects of shipping, lysing reagent, cell preparation method, and antibody lot were evaluated. RESULTS Shipped HCL specimens (n = 69) had a significantly lower mean CD4 ABC of 38,788 (CV = 9.1%) compared to fresh specimens (n = 105) CD4 value of 40,330 (CV = 8.4%) (P < 0.05). In NDB, significant differences were seen for fresh versus shipped specimens using the stain/lyse method but not for lyse/stain method. Consistent differences in CD4 ABC based upon antibody lot were observed in fresh HCL and NDB samples. Stain/lyse and lyse/stain methods using NH(4) Cl lyse were compared in NDB using identical samples and antibodies. The NDB CD4 ABC values obtained with the lyse (NH(4) Cl)/stain method (45,562, 3.7% CV) were lower than those obtained with the stain/lyse (NH(4) Cl) method (49,955, 3.3% CV) with P < 0.001. CONCLUSIONS CD4 expression in HCL patient samples is not inherently different from that observed in NDB and therefore may serve as a biological control in clinical QFCM. Technical variables impact significantly on QFCM of CD4.
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Affiliation(s)
- Lili Wang
- Chemical Science and Technology Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-8312, USA
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Jasper GA, Arun I, Venzon D, Kreitman RJ, Wayne AS, Yuan CM, Marti GE, Stetler-Stevenson M. Variables affecting the quantitation of CD22 in neoplastic B cells. Cytometry B Clin Cytom 2010; 80:83-90. [PMID: 20872890 DOI: 10.1002/cyto.b.20567] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2010] [Revised: 07/29/2010] [Accepted: 08/04/2010] [Indexed: 11/10/2022]
Abstract
BACKGROUND Quantitative flow cytometry (QFCM) is being applied in the clinical flow cytometry laboratory for diagnosis, prognosis, and assessment of patients receiving antibody-based therapy. ABC values and the effect of technical variables on CD22 quantitation in acute lymphoblastic leukemia (ALL), chronic lymphocytic leukemia (CLL), mantle cell lymphoma (MCL), follicular lymphoma (FCL), hairy cell leukemia (HCL) and normal B cells were studied. METHODS The QuantiBrite System® was used to determine the level of CD22 expression (mean antibody bound per cell, ABC) by malignant and normal B cells. The intra-assay variability, number of cells required for precision, effect of delayed processing as well as shipment of peripheral blood specimens (delayed processing and exposure to noncontrolled environments), and the effect of paraformaldehyde fixation on assay results were studied. RESULTS The QuantiBRITE method of measuring CD22 ABC is precise (median CV 1.6%, 95% confidence interval, 1.2-2.3%) but a threshold of 250 malignant cells is required for reliable CD22 ABC values. Delayed processing and overnight shipment of specimens resulted in significantly different ABC values whereas fixation for up to 12 h had no significant effect. ABC measurements determined that CD22 expression is lower than normal in ALL, CLL, FCL, and MCL but higher than normal in HCL. CONCLUSIONS CD22 expression was atypical in the hematolymphoid malignancies studied and may have diagnostic utility. Technical variables such as cell number analyzed and delayed processing or overnight shipment of specimens impact significantly on the measurement of antigen expression by QFCM in the clinical laboratory.
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Affiliation(s)
- Gregory A Jasper
- Flow Cytometry Unit, Laboratory of Pathology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892, USA
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Arun I, Wulu JA, Janik JE, Jasper GA, Yuan CM, Venzon D, Stetler-Stevenson M. Visual inspection versus quantitative flow cytometry to detect aberrant CD2 expression in malignant T cells. Cytometry B Clin Cytom 2010; 78:169-75. [PMID: 20020522 PMCID: PMC2916169 DOI: 10.1002/cyto.b.20507] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
BACKGROUND Abnormal levels of T-cell antigen expression occur in T-cell neoplasia. We examined CD2 expression in malignant and normal T cells to determine if the level of CD2 expression differed significantly and if quantitation assisted in detecting this difference. METHOD Flow cytometric immunophenotypic (FCI) evaluation was performed on specimens from 36 patients with mature T-cell neoplasia. Abnormal T cells were identified based upon the abnormal FCI and morphology. Levels of CD2 expression were quantitated using 1:1 PE conjugates of anti-CD2 and QuantiBRITE bead standards to calculate the antibodies bound per cell (ABC). The efficacy of ABC measurement versus simple examination of dots plots was compared. RESULTS Abnormal levels of CD2 expression were frequently observed in mature T-cell malignancies. The CD2 ABC values were highly sensitive in detecting differences between malignant and normal T cells (P = 0.0028). In most cases (24/32 specimens, 75%), CD2 ABCs differed by >20%. CD2 ABCs had high variability in normal T cells. CONCLUSIONS CD2 expression by malignant T cells differed significantly from that of normal T-cells by CD2 ABC quantitation. The high variability in normal T-cell CD2 ABCs limited the determination of normal reference ranges and, thus, its utility in the diagnosis of T-cell neoplasia. However, examination of CD2 can help in detection of tumor cells when residual normal T cells are present for comparison. Moreover, the increased sensitivity of CD2 quantitation is valuable in confirming FCI cases where abnormalities in CD2 expression are difficult to appreciate by visual inspection alone.
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Affiliation(s)
- Indu Arun
- Flow Cytometry Unit, Laboratory of Pathology, Center for Cancer Research, National Cancer Institute, National Institutes of Health
| | - Jacqueline A. Wulu
- Flow Cytometry Unit, Laboratory of Pathology, Center for Cancer Research, National Cancer Institute, National Institutes of Health
| | - John E. Janik
- Metabolism Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health
| | - Gregory A. Jasper
- Flow Cytometry Unit, Laboratory of Pathology, Center for Cancer Research, National Cancer Institute, National Institutes of Health
| | - Constance M. Yuan
- Flow Cytometry Unit, Laboratory of Pathology, Center for Cancer Research, National Cancer Institute, National Institutes of Health
| | - David Venzon
- Biostatistics and Data Management Section, Center for Cancer Research, National Cancer Institute, National Institutes of Health
| | - Maryalice Stetler-Stevenson
- Flow Cytometry Unit, Laboratory of Pathology, Center for Cancer Research, National Cancer Institute, National Institutes of Health
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Jiang L, Yuan CM, Hubacheck J, Janik JE, Wilson W, Morris JC, Jasper GA, Stetler-Stevenson M. Variable CD52 expression in mature T cell and NK cell malignancies: implications for alemtuzumab therapy. Br J Haematol 2009; 145:173-9. [PMID: 19236377 DOI: 10.1111/j.1365-2141.2009.07606.x] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
The anti-CD52 antibody alemtuzumab has been explored as a novel targeted therapy in T cell malignancies. To assess the suitability of alemtuzumab therapy, we carried out a comprehensive study of CD52 expression using flow cytometry (FC) in 78 untreated patients diagnosed with mature T/natural killer (NK) cell neoplasms, including 34 adult T cell leukaemia/lymphomas (ATLL), two anaplastic large cell lymphomas (ALCL), three angioimmunoblastic T cell lymphomas (AITL), 16 cutaneous T cell lymphomas (CTCL), four extra-nodal T/NK cell lymphomas (ENT/NKCL), four hepatosplenic T cell lymphomas (HSTCL), 13 peripheral T cell lymphomas, not otherwise specified (PTCL-NOS) and two T-prolymphocytic leukaemia (T-PLL). The level of CD52 expression was quantified using QuantiBRITE standard beads. The level of CD52 expression varied widely within each diagnostic category. All AITL, HSTCL and T-PLL cases were CD52-positive and the frequency of CD52 expression was high in PTCL-NOS (92.3%), ATLL (94.1%) and CTCL (87.5%), implying a rational role for alemtuzumab in the treatment of these diseases; however, CD52 expression was low in ALCL (50%) and ENT/NKCL (25%). FC testing for cell surface expression of CD52 is indicated in patients with T/NK cell malignancies being considered for alemtuzumab therapy. Further studies are necessary to determine if the level of CD52 expression correlates with response to therapy.
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Affiliation(s)
- Liuyan Jiang
- Flow Cytometry Unit, Laboratory of Pathology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA
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Xie XY, Filie AC, Jasper GA, Fukushima PI, Stetler-Stevenson M. Diagnosis of unexpected acute myeloid leukemia and chronic lymphocytic leukemia: a case report demonstrating the perils of restricted panels in flow cytometric immunophenotyping. Cytometry 2000; 42:114-7. [PMID: 10797449 DOI: 10.1002/(sici)1097-0320(20000415)42:2<114::aid-cyto5>3.0.co;2-l] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
We report on the flow cytometric identification of concomitant acute myeloid leukemia and chronic lymphocytic leukemia in cytology specimens submitted with minimal clinical information. A 64-year-old man presented with fever and progressive dyspnea on exertion. Chest X-ray and computed tomography scan showed a left upper lobe pulmonary mass. Pulmonary capillary pullback specimens were collected to determine infectious verses neoplastic etiology. The pulmonary capillary pullback specimens showed atypical mononuclear cells with enlarged, slightly irregular nuclei; visible nucleoli; and basophilic cytoplasm. Flow cytometric analysis of the specimen for lymphoma was requested. Flow cytometric immunophenotypic studies showed that 78% of the cells were CD34 positive, CD45 dim positive and CD11c positive, consistent with acute myeloid leukemia. About 0. 75% of the cells expressed CD5 as well as dim CD20 and were monoclonal for kappa light chains: consistent with chronic lymphocytic leukemia/small lymphocytic lymphoma. At this time the clinician communicated a history of myelodysplastic syndrome of refractory anemia subtype. Peripheral blood was obtained for further immunophenotyping and the patient was immediately treated for his acute myeloid leukemia. This case demonstrates that a diagnostic antibody panel should allow evaluation of all cell types as per the U.S./Canadian consensus recommendations on the immunophenotypic analysis of hematologic neoplasia by flow cytometry (Stewart et al.: Cytometry 30:231-235, 1997). Published 2000 Wiley-Liss, Inc.
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Affiliation(s)
- X Y Xie
- Division of Clinical Sciences, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA
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