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Spychalska J, Duńska M, Myślińska A, Majewska-Wierzbicka M, Klimczak-Jajor E, Głodkowska-Mrówka E. Diagnostic landscape of first-time cytometric screening for paroxysmal nocturnal hemoglobinuria in Poland in 2013-2022. Orphanet J Rare Dis 2024; 19:271. [PMID: 39020342 PMCID: PMC11256427 DOI: 10.1186/s13023-024-03283-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2024] [Accepted: 07/05/2024] [Indexed: 07/19/2024] Open
Abstract
BACKGROUND Paroxysmal nocturnal hemoglobinuria (PNH) is an acquired hematopoietic stem cell disorder characterized by PIG-A mutations, leading to glycophosphatidylinositol (GPI)-anchored proteins deficiency that triggers hemolysis - a hallmark of the disease. PNH diagnostics is based on high-sensitivity multicolor flow cytometry (MFC), enabling to detect even small populations of PNH cells. In this single-center, retrospective study, we aimed to characterize a cohort of PNH clone-positive patients first time screened from January 1st, 2013 until December 31st, 2022 with MFC according to International Clinical Cytometry Society PNH Consensus Guidelines. RESULTS Out of 2790 first-time screened individuals, the presence of PNH clone in neutrophils was detected in 322 patients, including 49 children and 273 adults. Annual incidence was stable at a median of 31 patients (14 and 19 with clone sizes ≤ 1% and > 1%, respectively), with a decline in number of patients with clone sizes > 1% observed in 2020, potentially influenced by the COVID-19 pandemic. The most common screening indications were aplastic anemia and other cytopenias. CONCLUSIONS A significant underrepresentation of hemolytic patients was observed as compared to the published cohorts suggesting that these patients are missed in diagnostic process and classic PNH remains underdiagnosed in Poland.
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Affiliation(s)
- Justyna Spychalska
- Department of Hematological and Transfusion Immunology, Institute of Hematology and Transfusion Medicine, Chocimska 5, Warsaw, 00-791, Poland
| | - Magdalena Duńska
- Department of Hematological and Transfusion Immunology, Institute of Hematology and Transfusion Medicine, Chocimska 5, Warsaw, 00-791, Poland
| | - Anna Myślińska
- Department of Hematological and Transfusion Immunology, Institute of Hematology and Transfusion Medicine, Chocimska 5, Warsaw, 00-791, Poland
| | - Monika Majewska-Wierzbicka
- Department of Hematological and Transfusion Immunology, Institute of Hematology and Transfusion Medicine, Chocimska 5, Warsaw, 00-791, Poland
| | - Edyta Klimczak-Jajor
- Department of Hematological and Transfusion Immunology, Institute of Hematology and Transfusion Medicine, Chocimska 5, Warsaw, 00-791, Poland
| | - Eliza Głodkowska-Mrówka
- Department of Hematological and Transfusion Immunology, Institute of Hematology and Transfusion Medicine, Chocimska 5, Warsaw, 00-791, Poland.
- Department of Laboratory Diagnostics and Clinical Immunology of Developmental Age, Medical University of Warsaw, Warsaw, Poland.
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Torres-Valdetano Á, Vallejo-Ruiz V, Milflores-Flores L, Martínez-Morales P. Role of PIGM and PIGX in glycosylphosphatidylinositol biosynthesis and human health (Review). Biomed Rep 2024; 20:57. [PMID: 38414627 PMCID: PMC10895387 DOI: 10.3892/br.2024.1746] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2023] [Accepted: 01/09/2024] [Indexed: 02/29/2024] Open
Abstract
Glycosylphosphatidylinositol-glycan (GPI) is an anchor to specific cell surface proteins known as GPI-anchored proteins (APs) that are localized in lipid rafts and may act as cell co-receptors, enzymes and adhesion molecules. The present review investigated the significance of GPI biosynthesis class phosphatidylinositol-glycan (PIG)M and PIGX in GPI synthesis and their implications in human health conditions. PIGM encodes GPI-mannosyltransferase I (MT-I) enzyme that adds the first mannose to the GPI core structure. PIGX encodes the regulatory subunit of GPI-MT-I. The present review summarizes characteristics of the coding sequences of PIGM and PIGX, and their expression in humans, as well as the relevance of GPI-MT-I and the regulatory subunit in maintaining the presence of GPI-APs on the cell surface and their secretion. In addition, the association of PIGM mutations with paroxysmal nocturnal hemoglobinuria and certain types of GPI-deficiency disease and the altered expression of PIGM and PIGX in cancer were also reviewed. In addition, their interaction with other proteins was described, suggesting a complex role in cell biology. PIGM and PIGX are critical genes for GPI synthesis. Understanding gene and protein regulation may provide valuable insights into the role of GPI-APs in cellular processes.
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Affiliation(s)
- Ángeles Torres-Valdetano
- Faculty of Biological Science, Building BIO 1 University City, Autonomous University of Puebla, Puebla 72570, Mexico
| | - Verónica Vallejo-Ruiz
- Mexican Social Security Institute, East Biomedical Research Center, Puebla 74360, Mexico
| | - Lorena Milflores-Flores
- Faculty of Biological Science, Building BIO 1 University City, Autonomous University of Puebla, Puebla 72570, Mexico
| | - Patricia Martínez-Morales
- National Council of Humanities, Sciences and Technologies, East Biomedical Research Center, Puebla 74360, Mexico
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Peixoto VP, Prudêncio C, Vieira M, Sousa SF. Evaluation of the impact of two C5 genetic variants on C5-eculizumab complex stability at the molecular level. J Biomol Struct Dyn 2024:1-10. [PMID: 38529903 DOI: 10.1080/07391102.2024.2331091] [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: 11/29/2023] [Accepted: 03/11/2024] [Indexed: 03/27/2024]
Abstract
Complement C5 is the target of the monoclonal antibody eculizumab, used in complement dysregulating disorders, like the rare disease Paroxysmal Nocturnal Hemoglobinuria (PNH). PNH is an acquired hematopoietic stem cell condition characterized by aberrant destruction of erythrocytes, chronic hemolytic anemia, and thromboembolism propensity. C5 is a protein component of the complement system which is part of the immune system of the body and plays a prominent role in the destruction of red blood cells, misidentifying them as a threat. This work describes the application of molecular dynamics simulations to the study of the underlying interactions between complement C5 and eculizumab. This study also reveals the importance of single nucleotide polymorphisms on C5 protein concerning the effective inhibition of the mAB, involving the mechanistic events taking place at the interface spots of the complex. The predicted conformational change in the C5 Arg885/His/Cys mutation has implications on the protein's interaction with eculizumab, compromising their compatibility. The acquired insights into the conformational changes, dynamics, flexibility, and interactions shed light on the knowledge of the function of this biomolecule providing answers about the poor response to the treatment in PNH patient carriers of the mutations. By investigating the intricate dynamics, significant connections between C5 and eculizumab can be uncovered. Such insights may aid in the creation of novel compounds or lead to the enhancement of eculizumab's efficacy.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Vanda P Peixoto
- Chemical and Biomolecular Sciences, School of Health, Polytechnic Institute of Porto, Porto, Portugal
- Center for Translational Health and Medical Biotechnology Research (TBIO), Polytechnic Institute of Porto, Porto, Portugal
- LAQV/REQUIMTE, BioSIM - Departamento de Biomedicina, Faculdade de Medicina, Universidade do Porto, Porto, Portugal
| | - Cristina Prudêncio
- Chemical and Biomolecular Sciences, School of Health, Polytechnic Institute of Porto, Porto, Portugal
- Center for Translational Health and Medical Biotechnology Research (TBIO), Polytechnic Institute of Porto, Porto, Portugal
- Institute for Research and Innovation in Health (i3S), University of Porto, Porto, Portugal
| | - Mónica Vieira
- Chemical and Biomolecular Sciences, School of Health, Polytechnic Institute of Porto, Porto, Portugal
- Center for Translational Health and Medical Biotechnology Research (TBIO), Polytechnic Institute of Porto, Porto, Portugal
- Institute for Research and Innovation in Health (i3S), University of Porto, Porto, Portugal
| | - Sérgio F Sousa
- LAQV/REQUIMTE, BioSIM - Departamento de Biomedicina, Faculdade de Medicina, Universidade do Porto, Porto, Portugal
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Cheng WY, Fishman J, Yenikomshian M, Mahendran M, Kunzweiler C, Vu JD, Duh MS. Dosing Patterns of Patients with Paroxysmal Nocturnal Hemoglobinuria Treated with Ravulizumab in the United States: A Retrospective Claims-Based Analysis. Adv Ther 2024; 41:413-430. [PMID: 37999832 PMCID: PMC10796480 DOI: 10.1007/s12325-023-02725-5] [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: 08/11/2023] [Accepted: 10/30/2023] [Indexed: 11/25/2023]
Abstract
INTRODUCTION Complement factor 5 inhibitors eculizumab and, recently, ravulizumab are standard therapies for paroxysmal nocturnal hemoglobinuria (PNH). However, some patients experience suboptimal response and may benefit from dosage adjustments. Ravulizumab is administered less frequently than eculizumab on the basis of patient's body weight. This retrospective analysis of insurance claims investigated ravulizumab dosing patterns among patients with PNH from the USA. METHODS Patients aged ≥ 12 years with ≥ 2 ravulizumab infusions between June 21, 2019 and May 6, 2021, and ≥ 6 months of continuous clinical activity prior to first ravulizumab infusion (index date) were identified from the Symphony Health Integrated Dataverse (IDV®) database. Observed mean (standard deviation, SD) ravulizumab doses administered were reported and stratified by previous eculizumab use. Scenarios adjusting for patients' body weights (unavailable in Symphony Health IDV) based on the US general population distribution were performed to estimate percentages of patients receiving label-recommended doses. RESULTS Among 433 patients (mean [SD] age 47 [17] years), the mean (SD) loading dose was 3316.3 (2931.7) mg, greater than the maximal label-recommended loading dose (3000 mg for patients ≥ 100 kg). The mean (SD) loading doses were 3581.3 (3673.7) mg for eculizumab-naive versus 3093.1 (2096.8) mg for eculizumab-experienced patients. Over a mean (SD) treatment period of 11.8 (6.9) months, the mean (SD) average maintenance dose was 3403.7 (1024.4) mg, falling between label-recommended maintenance dose categories (3300 mg for ≥ 60 to < 100 kg; 3600 mg for ≥ 100 kg). Estimated percentages of patients receiving label-recommended loading and maintenance doses were 23.1% and 39.2%, respectively; 59.1% and 28.4% were estimated to receive above label-recommended loading and average maintenance doses, respectively. CONCLUSION Although limited by missing clinical characteristics including body weight, this study of ravulizumab dosing patterns in patients with PNH identified potential deviations from label-recommended dosing, warranting further investigations of treatment response to complement inhibitors in PNH.
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Affiliation(s)
- Wendy Y Cheng
- Analysis Group, Inc., 111 Huntington Ave, 14th Floor, Boston, MA, USA
| | | | | | - Malena Mahendran
- Analysis Group, Inc., 111 Huntington Ave, 14th Floor, Boston, MA, USA
| | - Colin Kunzweiler
- Analysis Group, Inc., 111 Huntington Ave, 14th Floor, Boston, MA, USA
| | - Jensen Duy Vu
- Analysis Group, Inc., 111 Huntington Ave, 14th Floor, Boston, MA, USA
| | - Mei Sheng Duh
- Analysis Group, Inc., 111 Huntington Ave, 14th Floor, Boston, MA, USA.
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Krishnan S, Sarda S, Kunzweiler C, Wu M, Sundaresan S, Huynh L, Duh MS, Escalante CP. Literature Review of Fatigue Scales and Association with Clinically Meaningful Improvements in Outcomes Among Patients With and Without Paroxysmal Nocturnal Hemoglobinuria. Adv Ther 2022; 39:1959-1975. [PMID: 35316499 PMCID: PMC9056457 DOI: 10.1007/s12325-022-02111-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2022] [Accepted: 03/02/2022] [Indexed: 11/15/2022]
Abstract
Introduction Paroxysmal nocturnal hemoglobinuria (PNH) is a rare blood disorder characterized by anemia and debilitating fatigue. Limited evidence characterizes the association between hemoglobin, an indicator of anemia and disease activity, and patient-reported fatigue scales. This review identifies benchmarks for clinically meaningful improvements in patients with and without PNH. Methods MEDLINE, Embase, Cochrane, and PsycINFO databases were searched along with Google Scholar to identify publications for patients with and without PNH. Full-text articles and conference abstracts of clinical trials or observational studies that examined patient-reported fatigue or associations between fatigue and hemoglobin were included. Results Fourteen publications were included in this study. Four clinical trials conducted in patients with PNH reported that patients achieved and sustained clinically meaningful improvements in fatigue. However, these studies did not examine the association between fatigue and hemoglobin. Ten studies conducted in patients with cancer and anemia (with or without chemotherapy) demonstrated an association between increased hemoglobin and improvements in fatigue (P < 0.05). The greatest incremental gain in fatigue improvement was observed when hemoglobin increased from 11 to 12 g/dL. Conclusion Evidence among patients with cancer without PNH demonstrates that increased hemoglobin levels are associated with clinically significant improvements in fatigue. Future studies should validate this relationship among patients with PNH. Supplementary Information The online version contains supplementary material available at 10.1007/s12325-022-02111-7.
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