1
|
Li Q, Ai L, Zuo L, Li J, Zhao F, Xu A, Zhang B, Cai L, Hu Y, Sun C. Circulating plasma cells as a predictive biomarker in Multiple myeloma: an updated systematic review and meta-analysis. Ann Med 2024; 56:2338604. [PMID: 38599340 PMCID: PMC11008311 DOI: 10.1080/07853890.2024.2338604] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/08/2023] [Accepted: 03/22/2024] [Indexed: 04/12/2024] Open
Abstract
BACKGROUND Circulating plasma cells (CPCs) are defined by the presence of peripheral blood clonal plasma cells, which would contribute to the progression and dissemination of multiple myeloma (MM). An increasing number of studies have demonstrated the predictive potential of CPCs in the past few years. Therefore, there is a growing need for an updated meta-analysis to identify the specific relationship between CPCs and the prognosis of MM based on the current research status. METHODS The PubMed, Embase, and Cochrane Library databases were screened to determine eligible studies from inception to November 5, 2023. Publications that reported the prognostic value of CPCs in MM patients were included. Hazard ratios (HRs) with 95% confidence intervals (CIs) of overall survival (OS) and progression-free survival (PFS) were extracted to pool the results. Subgroup analyses were performed based on region, sample size, cut-off value, detection time, initial treatment, and data type. The association between CPCs level and clinicopathological characteristics, including the International Staging System (ISS), Revised-ISS (R-ISS), and cytogenetic abnormalities were also evaluated. Statistical analyses were conducted using STATA 17.0 software. RESULTS Twenty-two studies with a total of 5637 myeloma patients were enrolled in the current meta-analysis. The results indicated that myeloma patients with elevated CPCs were expected to have a poor OS (HR = 2.19, 95% CI: 1.81-2.66, p < 0.001) and PFS (HR = 2.45, 95% CI: 1.93-3.12, p < 0.001). Subgroup analyses did not alter the prognostic role of CPCs, regardless of region, sample size, cut-off value, detection time, initial treatment, or data type. Moreover, the increased CPCs were significantly related to advanced tumour stage (ISS III vs. ISS I-II: pooled OR = 2.89, 95% CI: 2.41-3.46, p < 0.001; R-ISS III vs. R-ISS I-II: pooled OR = 3.65, 95% CI: 2.43-5.50, p < 0.001) and high-risk cytogenetics (high-risk vs. standard-risk: OR = 2.22, 95% CI: 1.60-3.08, p < 0.001). CONCLUSION Our meta-analysis confirmed that the increased number of CPCs had a negative impact on the PFS and OS of MM patients. Therefore, CPCs could be a promising prognostic biomarker that helps with risk stratification and disease monitoring.
Collapse
Affiliation(s)
- Qun Li
- Institute of Hematology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Lisha Ai
- Institute of Hematology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Liping Zuo
- Institute of Hematology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Junying Li
- Institute of Hematology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Fei Zhao
- Institute of Hematology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Aoshuang Xu
- Institute of Hematology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Bo Zhang
- Institute of Hematology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Li Cai
- Institute of Hematology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Yu Hu
- Institute of Hematology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Collaborative Innovation Center of Hematology, Huazhong University of Science and Technology, Wuhan, China
| | - Chunyan Sun
- Institute of Hematology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Collaborative Innovation Center of Hematology, Huazhong University of Science and Technology, Wuhan, China
| |
Collapse
|
2
|
Obiorah I, Courville EL. Diagnostic Flow Cytometry in the Era of Targeted Therapies: Lessons from Therapeutic Monoclonal Antibodies and Chimeric Antigen Receptor T-cell Adoptive Immunotherapy. Surg Pathol Clin 2023; 16:423-431. [PMID: 37149367 DOI: 10.1016/j.path.2023.01.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Therapeutic monoclonal antibodies (therapeutic mAb) and adoptive immunotherapy have become increasingly more common in the treatment of hematolymphoid neoplasms, with practical implications for diagnostic flow cytometry. Their use can reduce the sensitivity of flow cytometry for populations of interest owing to downregulation/loss of the target antigen, competition for the target antigen, or lineage switch. Expanded flow panels, marker redundancy, and exhaustive gating strategies can overcome this limitation. Therapeutic mAb have been reported to cause pseudo-light chain restriction, and awareness of this potential artifact is key. Established guidelines do not yet exist for antigen expression by flow cytometry for therapeutic purposes.
Collapse
Affiliation(s)
- Ifeyinwa Obiorah
- Department of Pathology, University of Virginia Health, PO Box 800214, Charlottesville, VA 22908, USA
| | - Elizabeth L Courville
- Department of Pathology, University of Virginia Health, PO Box 800214, Charlottesville, VA 22908, USA.
| |
Collapse
|
3
|
Gao Q, Chen X, Cherian S, Roshal M. Mature B‐ and plasma‐cell flow cytometric analysis: A review of the impact of targeted therapy. CYTOMETRY PART B: CLINICAL CYTOMETRY 2022; 104:224-242. [PMID: 36321879 DOI: 10.1002/cyto.b.22097] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2022] [Revised: 10/04/2022] [Accepted: 10/12/2022] [Indexed: 11/06/2022]
Abstract
Flow cytometry has been indispensable in diagnosing B cell lymphoma and plasma cell neoplasms. The advances in novel multicolor flow cytometry have also made this technology a robust tool for monitoring minimal/measurable residual disease in chronic lymphocytic leukemia and multiple myeloma. However, challenges using conventional gating strategies to isolate neoplastic B or plasma cells are emerging due to the rapidly increasing number of antibody therapeutics targeting single or multiple classic B/plasma cell-lineage markers, such as CD19, CD20, and CD22 in B cells and CD38 in plasma cells. This review is the first of a two-part series that summarizes the most current targeted therapies used in B and plasma cell neoplasms and proposes detailed alternative approaches to overcome post-targeted therapy analysis challenges by flow cytometry. The second review in this series (Chen et al.) focuses on challenges encountered in the use of targeted therapy in precursor B cell neoplasms.
Collapse
Affiliation(s)
- Qi Gao
- Hematopathology Service, Department of Pathology and Laboratory Medicine Memorial Sloan Kettering Cancer Center New York New York USA
| | - Xueyan Chen
- Department of Laboratory Medicine and Pathology University of Washington Seattle WA USA
| | - Sindu Cherian
- Department of Laboratory Medicine and Pathology University of Washington Seattle WA USA
| | - Mikhail Roshal
- Hematopathology Service, Department of Pathology and Laboratory Medicine Memorial Sloan Kettering Cancer Center New York New York USA
| |
Collapse
|
4
|
Pape LJ, Hambach J, Gebhardt AJ, Rissiek B, Stähler T, Tode N, Khan C, Weisel K, Adam G, Koch-Nolte F, Bannas P. CD38-specific nanobodies allow in vivo imaging of multiple myeloma under daratumumab therapy. Front Immunol 2022; 13:1010270. [PMID: 36389758 PMCID: PMC9647632 DOI: 10.3389/fimmu.2022.1010270] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2022] [Accepted: 10/03/2022] [Indexed: 08/30/2023] Open
Abstract
RATIONALE Recent studies have demonstrated the feasibility of CD38-specific antibody constructs for in vivo imaging of multiple myeloma. However, detecting multiple myeloma in daratumumab-pretreated patients remains difficult due to overlapping binding epitopes of the CD38-specific imaging antibody constructs and daratumumab. Therefore, the development of an alternative antibody construct targeting an epitope of CD38 distinct from that of daratumumab is needed. We report the generation of a fluorochrome-conjugated nanobody recognizing such an epitope of CD38 to detect myeloma cells under daratumumab therapy in vitro, ex vivo, and in vivo. METHODS We conjugated the CD38-specific nanobody JK36 to the near-infrared fluorescent dye Alexa Fluor 680. The capacity of JK36AF680 to bind and detect CD38-expressing cells pretreated with daratumumab was evaluated on CD38-expressing tumor cell lines in vitro, on primary myeloma cells from human bone marrow biopsies ex vivo, and in a mouse tumor model in vivo. RESULTS Fluorochrome-labeled nanobody JK36AF680 showed specific binding to CD38-expressing myeloma cells pretreated with daratumumab in vitro and ex vivo and allowed for specific imaging of CD38-expressing xenografts in daratumumab-pretreated mice in vivo. CONCLUSIONS Our study demonstrates that a nanobody recognizing a distinct, non-overlapping epitope of CD38 allows the specific detection of myeloma cells under daratumumab therapy in vitro, ex vivo, and in vivo.
Collapse
Affiliation(s)
- Luca Julius Pape
- Department of Diagnostic and Interventional Radiology and Nuclear Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
- Institute of Immunology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Julia Hambach
- Department of Diagnostic and Interventional Radiology and Nuclear Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
- Institute of Immunology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Anna Josephine Gebhardt
- Department of Diagnostic and Interventional Radiology and Nuclear Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
- Institute of Immunology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Björn Rissiek
- Department of Neurology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Tobias Stähler
- Institute of Immunology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Natalie Tode
- Institute of Immunology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Cerusch Khan
- Department of Diagnostic and Interventional Radiology and Nuclear Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
- Institute of Immunology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Katja Weisel
- Department of Oncology, Hematology and Bone Marrow Transplantation, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Gerhard Adam
- Department of Diagnostic and Interventional Radiology and Nuclear Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Friedrich Koch-Nolte
- Institute of Immunology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Peter Bannas
- Department of Diagnostic and Interventional Radiology and Nuclear Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| |
Collapse
|
5
|
Canales-Herrerias P, Crickx E, Broketa M, Sokal A, Chenon G, Azzaoui I, Vandenberghe A, Perima A, Iannascoli B, Richard-Le Goff O, Castrillon C, Mottet G, Sterlin D, Robbins A, Michel M, England P, Millot GA, Eyer K, Baudry J, Mahevas M, Bruhns P. High-affinity autoreactive plasma cells disseminate through multiple organs in patients with immune thrombocytopenic purpura. J Clin Invest 2022; 132:153580. [PMID: 35503254 PMCID: PMC9197514 DOI: 10.1172/jci153580] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2021] [Accepted: 04/28/2022] [Indexed: 11/17/2022] Open
Abstract
The major therapeutic goal for immune thrombocytopenic purpura (ITP) is to restore normal platelet counts using drugs to promote platelet production or by interfering with mechanisms responsible for platelet destruction. Eighty percent of patients with ITP possess anti–integrin αIIbβ3 IgG autoantibodies that cause platelet opsonization and phagocytosis. The spleen is considered the primary site of autoantibody production by autoreactive B cells and platelet destruction. The immediate failure in approximately 50% of patients to recover a normal platelet count after anti-CD20 rituximab-mediated B cell depletion and splenectomy suggests that autoreactive, rituximab-resistant, IgG-secreting B cells (IgG-SCs) reside in other anatomical compartments. We analyzed more than 3,300 single IgG-SCs from spleen, bone marrow, and/or blood of 27 patients with ITP, revealing high interindividual variability in affinity for αIIbβ3, with variations over 3 logs. IgG-SC dissemination and range of affinities were, however, similar for each patient. Longitudinal analysis of autoreactive IgG-SCs upon treatment with the anti-CD38 mAb daratumumab demonstrated variable outcomes, from complete remission to failure with persistence of high-affinity anti–αIIbβ3 IgG-SCs in the bone marrow. This study demonstrates the existence and dissemination of high-affinity autoreactive plasma cells in multiple anatomical compartments of patients with ITP that may cause the failure of current therapies.
Collapse
Affiliation(s)
| | - Etienne Crickx
- INSERM U1151/CNRS UMS8253, Institut Necker-Enfants Malades, Paris, France
| | - Matteo Broketa
- Department of Immunology, Institut Pasteur, Paris, France
| | - Aurélien Sokal
- INSERM U1151/CNRS UMS8253, Institut Necker-Enfants Malades, Paris, France
| | - Guilhem Chenon
- Laboratoire Colloïdes et Matériaux Divisés (LCMD), ESPCI, Paris, France
| | - Imane Azzaoui
- Service de Médecine Interne, Assistance Publique Hôpitaux de Paris (AP-HP), Université Paris Est Créteil, Paris, France
| | - Alexis Vandenberghe
- Service de Médecine Interne, Assistance Publique Hôpitaux de Paris (AP-HP), Université Paris Est Créteil, Paris, France
| | - Angga Perima
- Department of Immunology, Institut Pasteur, Paris, France
| | | | | | | | | | | | - Ailsa Robbins
- Department of Internal Medicine, Infectious Diseases, and Clinical Immunolo, Robert Debré Hospital, Reims University Hospitals, Reims, France
| | - Marc Michel
- Service de Médecine Interne, Centre Hospitalier Universitaire Henri-Mondor, Créteil, France
| | - Patrick England
- Plateforme de Biophysique Moléculaire, Institut Pasteur, Paris, France
| | - Gael A Millot
- Hub Bioinformatique et Biostatistique, Institut Pasteur, Paris, France
| | - Klaus Eyer
- Laboratory for Functional Immune Repertoire Analysis, ETH Zurich, Zurich, Switzerland
| | - Jean Baudry
- Laboratoire Colloïdes et Matériaux Divisés (LCMD), ESPCI, Paris, France
| | - Matthieu Mahevas
- INSERM U1151/CNRS UMS8253, Institut Necker-Enfants Malades, Paris, France
| | | |
Collapse
|
6
|
Broijl A, de Jong ACM, van Duin M, Sonneveld P, Kühnau J, van der Velden VHJ. VS38c and CD38-Multiepitope Antibodies Provide Highly Comparable Minimal Residual Disease Data in Patients With Multiple Myeloma. Am J Clin Pathol 2022; 157:494-497. [PMID: 34643211 PMCID: PMC8973271 DOI: 10.1093/ajcp/aqab163] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Accepted: 08/25/2021] [Indexed: 01/03/2023] Open
Abstract
Objectives To compare flow cytometric minimal residual disease (MRD) data obtained using the EuroFlow approach, including the CD38-multiepitope (ME) antibody or the VS38c antibody. Methods We evaluated 29 bone marrow samples from patients with multiple myeloma (MM), of whom 15 had received daratumumab within the past 6 months. We evaluated MRD data and fluorescence intensities. Results Qualitative MRD data were 100% concordant between the 2 approaches. In MRD-positive samples (n = 14), MRD levels showed an excellent correlation (R2 = 0.999). Whereas VS38c staining was strong in both normal plasma cells and MM cells, independent of daratumumab treatment, staining intensities for CD38 were lower in MM cells compared with normal plasma cells, and on both cell types CD38 expression was significantly reduced in daratumumab-treated patients. Conclusions Both CD38-ME and VS38c allow reliable MRD detection in MM patients, but the high expression of VS38c allows easier identification of MM cells, especially in daratumumab-treated patients.
Collapse
Affiliation(s)
- Annemiek Broijl
- Department of Hematology, Erasmus MC, University Medical Center Rotterdam, Rotterdam, The Netherlands
| | - Augustinus C M de Jong
- Department of Immunology, Laboratory Medical Immunology, Erasmus MC, University Medical Center Rotterdam, Rotterdam, The Netherlands
| | - Mark van Duin
- Department of Hematology, Erasmus MC, University Medical Center Rotterdam, Rotterdam, The Netherlands
| | - Pieter Sonneveld
- Department of Hematology, Erasmus MC, University Medical Center Rotterdam, Rotterdam, The Netherlands
| | - Jesper Kühnau
- Reagent Partnership Division, Diagnostics and Genomics Group, Agilent Technologies, Glostrup, Denmark
| | - Vincent H J van der Velden
- Department of Immunology, Laboratory Medical Immunology, Erasmus MC, University Medical Center Rotterdam, Rotterdam, The Netherlands
| |
Collapse
|
7
|
Soh KT, Wallace PK. Evaluation of measurable residual disease in multiple myeloma by multiparametric flow cytometry: Current paradigm, guidelines, and future applications. Int J Lab Hematol 2021; 43 Suppl 1:43-53. [PMID: 34288449 DOI: 10.1111/ijlh.13562] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2021] [Revised: 03/22/2021] [Accepted: 04/07/2021] [Indexed: 12/16/2022]
Abstract
Multiple myeloma (MM) is a heterogeneous group of mature B-cell diseases that are typically characterized by the presence and accumulation of abnormal plasma cells (PCs), which results in the excess production of monoclonal immunoglobulin and/or light chain found in the serum and/or urine. Multiparametric flow cytometry (MFC) is an indispensable tool to supplement the diagnosis, classification and monitoring of the disease due to its high patient applicability, excellent sensitivity and encouraging results from various clinical trials. In this regard, minimal or, more appropriately, measurable residual disease (MRD) negativity by MFC has been recognized as a powerful predictor of favourable long-term outcomes. Before flow cytometry can be effectively implemented in the clinical setting for MM MRD testing, sample preparation, panel configuration, analysis and gating strategies must be optimized to ensure accurate results. This manuscript will discuss the current consensus guidelines for flow cytometric processing of samples and reporting of results for MM MRD testing. We also discuss alternative approaches to detect plasma cells in the presence of daratumumab treatment. Finally, there is a lack of information describing the subclonal distribution of myeloma cells based on their protein expression. The advent of high-dimensional analysis may assist in following the evolution of antigen expression patterns on abnormal plasma cells in patients with relapsed/refractory disease. This in turn can help identify clonal subtypes that are more aggressive for potential informed decision. An analysis using t-SNE to identify the emergence of PCs subclones by MFC, along with the analysis of their immunophenotypic profiles are presented as a future perspective.
Collapse
Affiliation(s)
- Kah Teong Soh
- Department of Flow and Image Cytometry, Roswell Park Comprehensive Cancer Center, Buffalo, NY, USA
| | - Paul K Wallace
- Department of Flow and Image Cytometry, Roswell Park Comprehensive Cancer Center, Buffalo, NY, USA
| |
Collapse
|
8
|
Ng DP. Flow cytometric myeloma measurable residual disease testing in the era of targeted therapies. Int J Lab Hematol 2021; 43 Suppl 1:71-77. [PMID: 34288444 DOI: 10.1111/ijlh.13587] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2021] [Revised: 04/22/2021] [Accepted: 04/27/2021] [Indexed: 11/30/2022]
Abstract
Therapies in myeloma are rapidly advancing with a host of new targeted therapies coming to market. While these drugs offer significant survival benefits and better side-effect profiles compared with conventional chemotherapeutics, they raise significant difficulties in monitoring post-therapy disease status by flow cytometry due to assay interference and/or selection of phenotypically different sub-clones. The principal culprit, anti-CD38 monoclonal antibodies, limits the ability to detect plasma cells based on classical CD38/CD45 gating. Other markers, such as CD138, are known to be suboptimal by flow cytometry. Various techniques have been proposed to overcome this problem. The most promising of these techniques has been the marker VS38c, a monoclonal antibody targeting an endoplasmic reticulum protein which has shown high sensitivity for plasma cells. Alternative techniques for gating plasma cells, while variably effective in the near term are already the subject of several targeted therapies rendering their usefulness limited in the longer term. Likewise, future targets of these therapies may render present aberrancy markers ineffective in MRD testing. These therapies pose challenges that must be overcome with new markers and novel panels in order for flow cytometric MRD testing to remain relevant.
Collapse
Affiliation(s)
- David P Ng
- University of Utah, Salt Lake City, UT, USA
| |
Collapse
|
9
|
Czeti Á, Szalóki G, Varga G, Szita VR, Komlósi ZI, Takács F, Márk Á, Timár B, Matolcsy A, Barna G. Limitations of VS38c labeling in the detection of plasma cell myeloma by flow cytometry. Cytometry A 2021; 101:159-166. [PMID: 34296508 DOI: 10.1002/cyto.a.24488] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Revised: 06/15/2021] [Accepted: 07/15/2021] [Indexed: 11/06/2022]
Abstract
Plasma cell myeloma (multiple myeloma [MM]) is a malignant neoplasm originating from the plasma cells. Besides other methods, flow cytometric analysis of the patient's bone marrow aspirate has an important role in the diagnosis and also in the response assessment. Since the cell surface markers, used for identifying abnormal plasma cells, are expressed diversely and the treatment can also alter the phenotype of the plasma cells, there is an increasing demand for new plasma cell markers. VS38c is a monoclonal antibody that recognizes the CLIMP-63 protein in the membrane of the endoplasmic reticulum. CLIMP-63 is known to be expressed at high levels in normal and pathologic plasma cells in the bone marrow, thus VS38c antibody can be used to identify them. Although VS38c staining of plasma cells is reported to be constant and strong even in myeloma, we were wondering whether sample preparation can affect the staining. We have investigated the effect of different permeabilization agents and washing of the cells on the quality of the VS38c staining and found that in many cases the staining is inadequate to identify the plasma cells. We measured the VS38c staining of the bone marrow aspirates of 196 MM patients and observed that almost all cases showed bright staining with VS38c. However, permeabilization with mild detergent resulted in the appearance of a significant VS38cdim subpopulation, which showed increased sensitivity to mechanical stress (centrifugation). Our results indicate that VS38cdim MM cells can appear due to the improper permeabilization of the endoplasmic reticulum and this finding raises the possibility of the existence of a plasma cell subpopulation with different membrane properties. The significance of this population is unclear yet, but these cells can be easily missed with VS38c staining and can be lost due to centrifugation-induced lysis during sample preparation.
Collapse
Affiliation(s)
- Ágnes Czeti
- First Department of Pathology and Experimental Cancer Research, Faculty of Medicine, Semmelweis University, Budapest, Hungary
| | - Gábor Szalóki
- First Department of Pathology and Experimental Cancer Research, Faculty of Medicine, Semmelweis University, Budapest, Hungary
| | - Gergely Varga
- Department of Internal Medicine and Haematology, Faculty of Medicine, Semmelweis University, Budapest, Hungary
| | - Virág Réka Szita
- Department of Internal Medicine and Haematology, Faculty of Medicine, Semmelweis University, Budapest, Hungary
| | - Zsolt István Komlósi
- Department of Genetics, Cell- and Immunobiology, Faculty of Medicine, Semmelweis University, Budapest, Hungary
| | - Ferenc Takács
- First Department of Pathology and Experimental Cancer Research, Faculty of Medicine, Semmelweis University, Budapest, Hungary
| | - Ágnes Márk
- First Department of Pathology and Experimental Cancer Research, Faculty of Medicine, Semmelweis University, Budapest, Hungary
| | - Botond Timár
- First Department of Pathology and Experimental Cancer Research, Faculty of Medicine, Semmelweis University, Budapest, Hungary
| | - András Matolcsy
- First Department of Pathology and Experimental Cancer Research, Faculty of Medicine, Semmelweis University, Budapest, Hungary
| | - Gábor Barna
- First Department of Pathology and Experimental Cancer Research, Faculty of Medicine, Semmelweis University, Budapest, Hungary
| |
Collapse
|
10
|
Mizuta S, Yamane N, Mononobe S, Watanabe A, Matsuki S, Komai T, Koba Y, Mitani S, Kawata T, Tamekane A, Watanabe M. VS38 staining contributes to a novel gating strategy in flow cytometry for small B cell lymphoma, especially in lymphoplasmacytic lymphoma/Waldenström macroglobulinemia. CYTOMETRY PART B-CLINICAL CYTOMETRY 2021; 102:50-61. [PMID: 33682304 DOI: 10.1002/cyto.b.22000] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2020] [Revised: 02/08/2021] [Accepted: 03/02/2021] [Indexed: 11/09/2022]
Abstract
BACKGROUND Multi-parametric flow cytometry (MFC) is a helpful tool for detecting neoplastic cells in malignant lymphoma; however, lymphoma cells can be difficult to detect when characteristic immunophenotypic abnormalities are not evident. We evaluated the stainability of VS38, which is used for multiple myeloma, in normal and abnormal B cells using MFC to develop a new strategy for detecting lymphoma cells. METHODS We compared the median fluorescence intensity of VS38 staining in lymphocytes from patients without hematopoietic neoplasms and in B cells from 26 patients with B cell lymphoma (BCL). To evaluate the performance of VS38 gating, we compared VS38-positive B cells with the percentages of BCL cells, and with the mutation ratios of MYD88 L265P measured by droplet digital PCR in patients with lymphoplasmacytic lymphoma (LPL)/Waldenström macroglobulinemia (WM). RESULTS CD27-positive memory B cells were stained with VS38, whereas normal lymphocytes were faintly stained. Lymphoma cells were stained with VS38 in 11 of 12 patients with LPL/WM, 3 of 3 with chronic lymphocytic leukemia, 3 of 5 with mantle cell lymphoma, 2 of 4 with follicular lymphoma, and 1 of 1 with splenic marginal zone lymphoma. The percentages of VS38-positive B cells in VS38-positive BCL were equivalent to those of lymphoma cells and the mutation ratios of MYD88 L265P in LPL/WM. CONCLUSIONS VS38 identified neoplastic cells in plasma cell disorders and BCL. This might improve the accuracy of BCL diagnosis, especially in patients with LPL/WM.
Collapse
Affiliation(s)
- Shumpei Mizuta
- Department of Clinical Laboratory, Hyogo Prefectural Amagasaki General Medical Center, Hyogo, Japan.,Laboratory of Hematology, Division of Medical Biophysics, Kobe University Graduate School of Health Sciences, Hyogo, Japan
| | - Noriko Yamane
- Department of Clinical Laboratory, Hyogo Prefectural Amagasaki General Medical Center, Hyogo, Japan
| | - Saya Mononobe
- Department of Clinical Laboratory, Hyogo Prefectural Amagasaki General Medical Center, Hyogo, Japan
| | - Asami Watanabe
- Department of Clinical Laboratory, Hyogo Prefectural Amagasaki General Medical Center, Hyogo, Japan
| | - Shinichiro Matsuki
- Department of Clinical Laboratory, Hyogo Prefectural Amagasaki General Medical Center, Hyogo, Japan
| | - Takao Komai
- Department of Clinical Laboratory, Hyogo Prefectural Amagasaki General Medical Center, Hyogo, Japan
| | - Yusuke Koba
- Department of Hematology, Hyogo Prefectural Amagasaki General Medical Center, Hyogo, Japan
| | - Sachiko Mitani
- Department of Hematology, Hyogo Prefectural Amagasaki General Medical Center, Hyogo, Japan
| | - Takahito Kawata
- Department of Hematology, Hyogo Prefectural Amagasaki General Medical Center, Hyogo, Japan.,Department of Hematology and Oncology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Akira Tamekane
- Department of Hematology, Hyogo Prefectural Amagasaki General Medical Center, Hyogo, Japan
| | - Mitsumasa Watanabe
- Department of Hematology, Hyogo Prefectural Amagasaki General Medical Center, Hyogo, Japan
| |
Collapse
|
11
|
Maclachlan KH, Came N, Diamond B, Roshal M, Ho C, Thoren K, Mayerhoefer ME, Landgren O, Harrison S. Minimal residual disease in multiple myeloma: defining the role of next generation sequencing and flow cytometry in routine diagnostic use. Pathology 2021; 53:385-399. [PMID: 33674146 DOI: 10.1016/j.pathol.2021.02.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2020] [Revised: 02/01/2021] [Accepted: 02/03/2021] [Indexed: 12/11/2022]
Abstract
For patients diagnosed with multiple myeloma (MM) there have been significant treatment advances over the past decade, reflected in an increasing proportion of patients achieving durable remissions. Clinical trials repeatedly demonstrate that achieving a deep response to therapy, with a bone marrow assessment proving negative for minimal residual disease (MRD), confers a significant survival advantage. To accurately assess for minute quantities of residual cancer requires highly sensitive methods; either multiparameter flow cytometry or next generation sequencing are currently recommended for MM response assessment. Under optimal conditions, these methods can detect one aberrant cell amongst 1,000,000 normal cells (a sensitivity of 10-6). Here, we will review the practical use of MRD assays in MM, including challenges in implementation for the routine diagnostic laboratory, standardisation across laboratories and clinical trials, the clinical integration of MRD status assessment into MM management and future directions for ongoing research.
Collapse
Affiliation(s)
- Kylee H Maclachlan
- Myeloma Service, Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, USA; Haematology Service, Peter MacCallum Cancer Centre, East Melbourne, Vic, Australia; Sir Peter MacCallum Department of Oncology, University of Melbourne, Parkville, Vic, Australia.
| | - Neil Came
- Sir Peter MacCallum Department of Oncology, University of Melbourne, Parkville, Vic, Australia; Pathology Department, Peter MacCallum Cancer Centre, East Melbourne, Vic, Australia
| | - Benjamin Diamond
- Myeloma Service, Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Mikhail Roshal
- Department of Pathology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Caleb Ho
- Department of Pathology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Katie Thoren
- Department of Pathology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Marius E Mayerhoefer
- Department of Radiology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Ola Landgren
- Myeloma Service, Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, USA; Myeloma Program, Department of Medicine, Sylvester Comprehensive Cancer Center, University of Miami, Miami, FL, USA
| | - Simon Harrison
- Haematology Service, Peter MacCallum Cancer Centre, East Melbourne, Vic, Australia; Sir Peter MacCallum Department of Oncology, University of Melbourne, Parkville, Vic, Australia
| |
Collapse
|
12
|
Novel Approaches to Improve Myeloma Cell Killing by Monoclonal Antibodies. J Clin Med 2020; 9:jcm9092864. [PMID: 32899714 PMCID: PMC7564331 DOI: 10.3390/jcm9092864] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2020] [Revised: 08/29/2020] [Accepted: 08/31/2020] [Indexed: 12/14/2022] Open
Abstract
The monoclonal antibodies (mAbs) have significantly changed the treatment of multiple myeloma (MM) patients. However, despite their introduction, MM remains an incurable disease. The mAbs currently used for MM treatment were developed with different mechanisms of action able to target antigens, such as cluster of differentiation 38 (CD38) and SLAM family member 7 (SLAMF7) expressed by both, MM cells and the immune microenvironment cells. In this review, we focused on the mechanisms of action of the main mAbs approved for the therapy of MM, and on the possible novel approaches to improve MM cell killing by mAbs. Actually, the combination of anti-CD38 or anti-SLAMF7 mAbs with the immunomodulatory drugs significantly improved the clinical effect in MM patients. On the other hand, pre-clinical evidence indicates that different approaches may increase the efficacy of mAbs. The use of trans-retinoic acid, the cyclophosphamide or the combination of anti-CD47 and anti-CD137 mAbs have given the rationale to design these types of combinations therapies in MM patients in the future. In conclusion, a better understanding of the mechanism of action of the mAbs will allow us to develop novel therapeutic approaches to improve their response rate and to overcome their resistance in MM patients.
Collapse
|
13
|
Evolving Role of Daratumumab: From Backbencher to Frontline Agent. CLINICAL LYMPHOMA MYELOMA & LEUKEMIA 2020; 20:572-587. [DOI: 10.1016/j.clml.2020.03.010] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2019] [Revised: 03/08/2020] [Accepted: 03/19/2020] [Indexed: 12/11/2022]
|
14
|
Shah N, Aiello J, Avigan DE, Berdeja JG, Borrello IM, Chari A, Cohen AD, Ganapathi K, Gray L, Green D, Krishnan A, Lin Y, Manasanch E, Munshi NC, Nooka AK, Rapoport AP, Smith EL, Vij R, Dhodapkar M. The Society for Immunotherapy of Cancer consensus statement on immunotherapy for the treatment of multiple myeloma. J Immunother Cancer 2020; 8:e000734. [PMID: 32661116 PMCID: PMC7359060 DOI: 10.1136/jitc-2020-000734] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/01/2020] [Indexed: 12/24/2022] Open
Abstract
Outcomes in multiple myeloma (MM) have improved dramatically in the last two decades with the advent of novel therapies including immunomodulatory agents (IMiDs), proteasome inhibitors and monoclonal antibodies. In recent years, immunotherapy for the treatment of MM has advanced rapidly, with the approval of new targeted agents and monoclonal antibodies directed against myeloma cell-surface antigens, as well as maturing data from late stage trials of chimeric antigen receptor CAR T cells. Therapies that engage the immune system to treat myeloma offer significant clinical benefits with durable responses and manageable toxicity profiles, however, the appropriate use of these immunotherapy agents can present unique challenges for practicing physicians. Therefore, the Society for Immunotherapy of Cancer convened an expert panel, which met to consider the current role of approved and emerging immunotherapy agents in MM and provide guidance to the oncology community by developing consensus recommendations. As immunotherapy evolves as a therapeutic option for the treatment of MM, these guidelines will be updated.
Collapse
Affiliation(s)
- Nina Shah
- Division of Hematology-Oncology, Department of Medicine, University of California San Francisco, San Francisco, California, USA
| | - Jack Aiello
- Patient Empowerment Network, San Jose, California, USA
| | - David E Avigan
- Division of Hematology and Hematologic Malignancies, Beth Israel Deaconess Medical Center, Boston, Massachusetts, USA
| | - Jesus G Berdeja
- Department of Medicine, Sarah Cannon Research Institute, Nashville, Tennessee, USA
| | - Ivan M Borrello
- Department of Oncology, The Sidney Kimmel Comprehensive Cancer Center of Johns Hopkins, Baltimore, Maryland, USA
| | - Ajai Chari
- Hematology and Medical Oncology, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Adam D Cohen
- Department of Medicine, Abramson Cancer Center at the University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Karthik Ganapathi
- Department of Laboratory Medicine, University of California San Francisco, San Francisco, California, USA
| | - Lissa Gray
- University of California San Francisco, San Francisco, CA, USA
| | - Damian Green
- Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, USA
| | - Amrita Krishnan
- Department of Hematology and Hematopoietic Cell Transplantation, Judy and Bernard Briskin Multiple Myeloma Center for Clinical Research, City of Hope Comprehensive Cancer Center, Duarte, California, USA
| | - Yi Lin
- Division of Hematology, Department of Internal Medicine, Mayo Clinic, Rochester, Minnesota, USA
- Division of Experimental Pathology, Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota, USA
| | - Elisabet Manasanch
- Department of Lymphoma/Myeloma, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA
| | - Nikhil C Munshi
- Jerome Lipper Multiple Myeloma Disease Center, Dana-Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts, USA
| | - Ajay K Nooka
- Department of Hematology/Oncology, Emory University, Atlanta, Georgia, USA
| | - Aaron P Rapoport
- University of Maryland Greenebaum Comprehensive Cancer Center, Baltimore, Maryland, USA
| | - Eric L Smith
- Myeloma Service and Cellular Therapeutics Center, Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, New York, USA
| | - Ravi Vij
- Division of Medical Oncology, Siteman Cancer Center, Washington University in Saint Louis School of Medicine, Saint Louis, Missouri, USA
| | - Madhav Dhodapkar
- School of Medicine, Department of Hematology and Medical Oncology, Winship Cancer Institute, Emory University, Atlanta, Georgia, USA
| |
Collapse
|
15
|
Sanoja-Flores L, Flores-Montero J, Pérez-Andrés M, Puig N, Orfao A. Detection of Circulating Tumor Plasma Cells in Monoclonal Gammopathies: Methods, Pathogenic Role, and Clinical Implications. Cancers (Basel) 2020; 12:E1499. [PMID: 32521788 PMCID: PMC7352573 DOI: 10.3390/cancers12061499] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2020] [Revised: 05/29/2020] [Accepted: 06/03/2020] [Indexed: 12/28/2022] Open
Abstract
Cancer dissemination and distant metastasis most frequently require the release of tumor cells into the blood circulation, both in solid tumors and most hematological malignancies, including plasma cell neoplasms. However, detection of blood circulating tumor cells in solid tumors and some hematological malignancies, such as the majority of mature/peripheral B-cell lymphomas and monoclonal gammopathies, has long been a challenge due to their very low frequency. In recent years, the availability of highly-sensitive and standardized methods for the detection of circulating tumor plasma cells (CTPC) in monoclonal gammopathies, e.g., next-generation flow cytometry (NGF), demonstrated the systematic presence of CTPC in blood in virtually every smoldering (SMM) and symptomatic multiple myeloma (MM) patient studied at diagnosis, and in the majority of patients with newly-diagnosed monoclonal gammopathies of undetermined significance (MGUS). These methods set the basis for further detailed characterization of CTPC vs. their bone marrow counterpart in monoclonal gammopathies, to investigate their role in the biology of the disease, and to confirm their strong impact on patient outcome when measured both at diagnosis and after initiating therapy. Here, we review the currently available techniques for the detection of CTPC, and determine their biological features, physiopathological role and clinical significance in patients diagnosed with distinct diagnostic categories of plasma cell neoplasms.
Collapse
Affiliation(s)
- Luzalba Sanoja-Flores
- Translational and Clinical Research Program, Centro de Investigación del Cáncer and Instituto de Biología Molecular y Celular del Cáncer, Consejo Superior de Investigaciones Científicas (CSIC)- University of Salamanca, 37007 Salamanca, Spain; (L.S.-F.); (J.F.-M.); (M.P.-A.)
- Centro de Investigación Biomédica en Red de Cáncer, CIBER-ONC number CB16/12/00400, Instituto Carlos III, 28029 Madrid, Spain
| | - Juan Flores-Montero
- Translational and Clinical Research Program, Centro de Investigación del Cáncer and Instituto de Biología Molecular y Celular del Cáncer, Consejo Superior de Investigaciones Científicas (CSIC)- University of Salamanca, 37007 Salamanca, Spain; (L.S.-F.); (J.F.-M.); (M.P.-A.)
- Centro de Investigación Biomédica en Red de Cáncer, CIBER-ONC number CB16/12/00400, Instituto Carlos III, 28029 Madrid, Spain
| | - Martín Pérez-Andrés
- Translational and Clinical Research Program, Centro de Investigación del Cáncer and Instituto de Biología Molecular y Celular del Cáncer, Consejo Superior de Investigaciones Científicas (CSIC)- University of Salamanca, 37007 Salamanca, Spain; (L.S.-F.); (J.F.-M.); (M.P.-A.)
- Centro de Investigación Biomédica en Red de Cáncer, CIBER-ONC number CB16/12/00400, Instituto Carlos III, 28029 Madrid, Spain
| | - Noemí Puig
- Department of Hematology, University Hospital of Salamanca, IBSAL, IBMCC (USAL-CSIC), 37007 Salamanca, Spain;
- Centro de Investigación Biomédica en Red de Cáncer, CIBER-ONC number CB16/12/00233, Instituto Carlos III, 28029 Madrid, Spain
| | - Alberto Orfao
- Translational and Clinical Research Program, Centro de Investigación del Cáncer and Instituto de Biología Molecular y Celular del Cáncer, Consejo Superior de Investigaciones Científicas (CSIC)- University of Salamanca, 37007 Salamanca, Spain; (L.S.-F.); (J.F.-M.); (M.P.-A.)
- Centro de Investigación Biomédica en Red de Cáncer, CIBER-ONC number CB16/12/00400, Instituto Carlos III, 28029 Madrid, Spain
| |
Collapse
|
16
|
Wardowska A, Komorniczak M, Skoniecka A, Bułło-Piontecka B, Lisowska KA, Dębska-Ślizień MA, Pikuła M. Alterations in peripheral blood B cells in systemic lupus erythematosus patients with renal insufficiency. Int Immunopharmacol 2020; 83:106451. [PMID: 32248020 DOI: 10.1016/j.intimp.2020.106451] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2020] [Revised: 03/25/2020] [Accepted: 03/25/2020] [Indexed: 01/14/2023]
Abstract
OBJECTIVE Systemic lupus erythematosus (SLE) is one of the autoimmune diseases, believed to be closely related to hyperactivity of B cells, overproduction of autoantibodies and immune complex formation and deposition in affected tissue. The autoreactive inflammation leads to multiorgan damage with kidney dysfunction in the forefront. Studies on lupus nephritis (LN), affecting the majority of SLE patients, are mainly focused on cells causing local inflammation. The aim of our work was to detect alterations in more accessible peripheral blood B cells in the course of SLE focusing on the influence of renal insufficiency (RI) on those parameters. METHODS We performed a comprehensive flow cytometry analysis of B cell subpopulations, analyzed gene expression patterns with qPCR, and examined serum cytokine levels with multiplex cytokine/chemokine assay. RESULTS We discovered distribution of specific B cell subsets, especially CD38+ cells, plasmablasts, associated with the presence and severity of the disease. Changes in expression of MBD2, DNMT1 and APRIL genes were not only associated with activity of SLE but also were significantly changed in patients with RI. CONCLUSIONS All these results shed new light on the role of circulating B cells, their subpopulations, function, and activity in the SLE with kidney manifestation.
Collapse
Affiliation(s)
- Anna Wardowska
- Laboratory of Tissue Engineering and Regenerative Medicine, Department of Embryology, Medical University of Gdansk, Gdansk, Poland.
| | - Michał Komorniczak
- Department of Nephrology, Transplantology and Internal Diseases, Medical University of Gdansk, Gdansk, Poland
| | - Aneta Skoniecka
- Laboratory of Tissue Engineering and Regenerative Medicine, Department of Embryology, Medical University of Gdansk, Gdansk, Poland
| | - Barbara Bułło-Piontecka
- Department of Nephrology, Transplantology and Internal Diseases, Medical University of Gdansk, Gdansk, Poland
| | | | - M Alicja Dębska-Ślizień
- Department of Nephrology, Transplantology and Internal Diseases, Medical University of Gdansk, Gdansk, Poland
| | - Michał Pikuła
- Laboratory of Tissue Engineering and Regenerative Medicine, Department of Embryology, Medical University of Gdansk, Gdansk, Poland
| |
Collapse
|
17
|
Courville EL, Yohe S, Shivers P, Linden MA. VS38 Identifies Myeloma Cells With Dim CD38 Expression and Plasma Cells Following Daratumumab Therapy, Which Interferes With CD38 Detection for 4 to 6 Months. Am J Clin Pathol 2020; 153:221-228. [PMID: 31679012 DOI: 10.1093/ajcp/aqz153] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
OBJECTIVES We report our institutional experience using VS38 to evaluate plasma cells by flow cytometry. METHODS Flow cytometry data were reanalyzed to compare plasma cell percentages between the standard panel and VS38 panel. Natural killer (NK) and plasma cell CD38 median fluorescence intensity (MFI) values were calculated. RESULTS Our cohort included 63 specimens from 38 patients. Twenty-six had received daratumumab (monoclonal anti-CD38 therapy) between less than 1 month and 17 months prior. For NK and plasma cells, CD38 MFI values were suppressed for 0 to 4 months and started to increase 4 to 6 months after last exposure. There was no significant difference in clonal plasma cell percentage calculated by the VS38 and standard panels; however, identification and quantification using the VS38 panel were easier. CONCLUSIONS VS38 is a viable alternative to bright CD38 to identify plasma cells and particularly helpful in myeloma cases with dim CD38 and after daratumumab. Daratumumab interference with CD38 identification persists 4 to 6 months after the last exposure.
Collapse
Affiliation(s)
- Elizabeth L Courville
- Department of Laboratory Medicine and Pathology, MHealth Fairview and University of Minnesota, Minneapolis
| | - Sophia Yohe
- Department of Laboratory Medicine and Pathology, MHealth Fairview and University of Minnesota, Minneapolis
| | - Paula Shivers
- Department of Laboratory Medicine and Pathology, MHealth Fairview and University of Minnesota, Minneapolis
| | - Michael A Linden
- Department of Laboratory Medicine and Pathology, MHealth Fairview and University of Minnesota, Minneapolis
| |
Collapse
|
18
|
Wang H, Lin P. Flow Cytometric Immunophenotypic Analysis in the Diagnosis and Prognostication of Plasma Cell Neoplasms. CYTOMETRY PART B-CLINICAL CYTOMETRY 2019; 96:338-350. [DOI: 10.1002/cyto.b.21844] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2019] [Revised: 08/23/2019] [Accepted: 08/26/2019] [Indexed: 12/19/2022]
Affiliation(s)
- Hao‐Wei Wang
- Flow Cytometry and Hematopathology Section, Laboratory of PathologyCCR, NCI, NIH Bethesda Maryland 20892
| | - Pei Lin
- Department of HematopathologyThe University of Texas MD Anderson Cancer Center Houston Texas 77030
| |
Collapse
|