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Zhou LY, Derebail VK, Desai PC, Elsherif L, Patillo KL, McCune P, Wichlan D, Landes K, Ogu UO, Nelson M, Loehr LR, Cronin RM, Tang Y, Cai J, Ataga KI. Persistent albuminuria and chronic kidney disease in adults with sickle cell anaemia: Results from a multicenter natural history study. Br J Haematol 2024. [PMID: 38978309 DOI: 10.1111/bjh.19636] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2024] [Accepted: 06/27/2024] [Indexed: 07/10/2024]
Abstract
Clinical and laboratory correlates of chronic kidney disease (CKD) in sickle cell anaemia remain incompletely defined. In a multicenter cohort study, we evaluated the prevalence of persistent albuminuria (PA) and characteristics associated with PA, albumin-creatinine ratio (ACR) and decreased estimated glomerular filtration rate (eGFR) using logistic, linear and multinomial regression models, respectively. Of 269 participants (median age: 30 years; 57.2% females), the prevalence of PA was 35.7%. Using baseline ACR values of <100 and ≥100 mg/g, the probabilities of PA were 30.0% and 94.6%, respectively. In multivariable logistic regression analyses, male sex (β = 0.80 [SE = 0.36], p = 0.024) and ACE inhibitors/ARBs use (β = 1.54 [SE = 0.43], p < 0.001) were associated with higher likelihoods of PA, while higher haemoglobin (β = -0.33 [SE = 0.13], p = 0.009) and HbF (β = -0.04 [SE = 0.02], p = 0.041) were associated with lower likelihoods of PA. In multivariable multinomial regression analyses, older age (β = 0.06 [SE = 0.02], p = 0.004) and higher alkaline phosphatase (β = 0.01 [SE = 0.00], p = 0.004) were associated with higher odds of having eGFR 60-90 versus eGFR>90 mL/min/1.73 m2 using the cystatin C-based CKD-EPI-2012 equation. Additionally, higher systolic blood pressure (β = 0.11 [SE = 0.03], p = 0.001) and blood urea nitrogen (β = 0.45 [SE = 0.12], p < 0.001) were associated with higher odds, while higher haemoglobin (β = -1.22 [SE = 0.43], p = 0.004) was associated with lower odds of having eGFR<60 versus eGFR>90 mL/min/1.73 m2. PA and decreased eGFR are associated with measures of disease severity and comorbid conditions (Clinicaltrials.gov Identifier: NCT03277547).
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Affiliation(s)
- Laura Y Zhou
- Department of Biostatistics and Health Data Science, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Vimal K Derebail
- Division of Nephrology and Hypertension, University of North Carolina, Chapel Hill, North Carolina, USA
| | - Payal C Desai
- Department of Hematology, Levine Cancer Institute-Atrium Health, Charlotte, North Carolina, USA
| | - Laila Elsherif
- Center for Sickle Cell Disease, University of Tennessee Health Science Center, Memphis, Tennessee, USA
| | - Kammie L Patillo
- Office of Clinical Trials, University of Tennessee Health Science Center, Memphis, Tennessee, USA
| | - Paula McCune
- Office of Clinical Trials, University of Tennessee Health Science Center, Memphis, Tennessee, USA
| | - David Wichlan
- Division of Hematology, University of North Carolina, Chapel Hill, North Carolina, USA
| | - Kristina Landes
- Division of Hematology, The Ohio State University, Columbus, Ohio, USA
| | - Ugochi O Ogu
- Center for Sickle Cell Disease, University of Tennessee Health Science Center, Memphis, Tennessee, USA
| | - Marquita Nelson
- Center for Sickle Cell Disease, University of Tennessee Health Science Center, Memphis, Tennessee, USA
| | - Laura R Loehr
- Division of General Medicine and Epidemiology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
| | - Robert M Cronin
- Department of Internal Medicine, The Ohio State University, Columbus, Ohio, USA
| | - Yihan Tang
- Department of Biostatistics, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
| | - Jianwen Cai
- Department of Biostatistics, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
| | - Kenneth I Ataga
- Center for Sickle Cell Disease, University of Tennessee Health Science Center, Memphis, Tennessee, USA
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Early ML, Raja M, Luo A, Solow M, Matusiak K, Eke AC, Shehata N, Kuo KH, Lanzkron S, Malinowski AK, Pecker LH. Blood pressure thresholds for the diagnosis of hypertensive disorders of pregnancy in sickle cell disease. Br J Haematol 2024; 204:1039-1046. [PMID: 38093478 PMCID: PMC10939908 DOI: 10.1111/bjh.19248] [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: 08/22/2023] [Revised: 10/11/2023] [Accepted: 11/27/2023] [Indexed: 01/19/2024]
Abstract
In this retrospective cohort study of singleton pregnancies in people with sickle cell disease (SCD) delivered at two academic centres between 1990 and 2021, we collected demographic and SCD-related data, pregnancy outcomes, and the highest systolic and diastolic blood pressure (SBP and DBP) at seven time periods. We compared the characteristics of subjects with new or worsening proteinuria (NWP) during pregnancy to those without. We then constructed receiver operating characteristic (ROC) curves to determine the blood pressure (BP) that best identifies those with NWP. The SBP or DBP thresholds which maximized sensitivity and specificity were 120 mmHg SBP (sensitivity: 55.2%, specificity: 73.5%) and 70 mmHg DBP (sensitivity: 27.6%, specificity: 67.7%). The existing BP threshold of 140/90 mmHg lacked sensitivity in both genotype groups (HbSS/HbSβ0 : SBP = 21% sensitive, DBP = 5.3% sensitive; HbSS/HbSβ+ : SBP = 10% sensitive, DBP = 0% sensitive). Finally, percent change in SBP, DBP and MAP were all poor tests for identifying NWP. Existing BP thresholds used to diagnose hypertensive disorders of pregnancy (HDP) are not sensitive for pregnant people with SCD. For this population, lowering the BP threshold that defines HDP may improve identification of those who need increased observation, consideration of early delivery and eclampsia prophylaxis.
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Affiliation(s)
- Macy L. Early
- Division of Hematology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Maidah Raja
- Division of Hematology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Amy Luo
- Division of Hematology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA
- Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD, USA
| | - Marissa Solow
- Division of Haematology, Department of Medicine, University Health Network, Toronto, Canada
- Department of Medicine, University of Toronto, Toronto, Canada
| | - Kristine Matusiak
- Division of Haematology, Department of Medicine, University Health Network, Toronto, Canada
- Department of Medicine, University of Toronto, Toronto, Canada
| | - Ahizechukwu C. Eke
- Division of Maternal-Fetal Medicine & Clinical Pharmacology
- Department of Gynecology and Obstetrics, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Nadine Shehata
- Division of Hematology, Sinai Health System, Department of Medicine, University of Toronto, Toronto, Ontario, Canada
| | - Kevin H.M. Kuo
- Division of Haematology, Department of Medicine, University Health Network, Toronto, Canada
- Department of Medicine, University of Toronto, Toronto, Canada
| | - Sophie Lanzkron
- Division of Hematology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Ann Kinga Malinowski
- Division of Hematology, Sinai Health System, Department of Medicine, University of Toronto, Toronto, Ontario, Canada
- Division of Maternal-Fetal Medicine, Sinai Health System
- Department of Obstetrics and Gynecology, University of Toronto, Toronto, Ontario, Canada
- Lunenfeld-Tanenbaum Research Institute, Sinai Health System, Toronto, Ontario, Canada
| | - Lydia H. Pecker
- Division of Hematology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA
- Department of Gynecology and Obstetrics, Johns Hopkins University School of Medicine, Baltimore, MD, USA
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Boma PM, Ngimbi SL, Kindundu JM, Wela JI, Ngoie NL, Ngwamah VM, Tshiswaka SM, Monga JK, Panda JM, Bonnechère B. Unveiling mortality risk factors in paediatric sickle cell disease patients during acute crises in the Democratic Republic of the Congo. Blood Cells Mol Dis 2024; 105:102828. [PMID: 38266515 DOI: 10.1016/j.bcmd.2024.102828] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2023] [Revised: 01/11/2024] [Accepted: 01/17/2024] [Indexed: 01/26/2024]
Abstract
Sickle cell disease (SCD) is a significant health burden in the Democratic Republic of the Congo (DRC). This study aims to identify predictive factors of mortality in SCD children admitted to emergency care in Lubumbashi, DRC. We performed a non-interventional cohort follow-up on SCD patients aged 0 to 16 admitted for a "true emergency". Demographic, clinical, and biological data were collected. Univariate and multivariate logistic regression analyses were performed to identify significant risk factors associated with mortality. Among the 121 patients included, 24 died during the follow-up period. Univariate regression revealed age, Mikobi score, referral origin, stroke, and severe infection as significant risk factors. Multivariate analyses identified Hb, WBC, SR, and LDH as predictive factors of mortality. Notably, patients aged 12 to 16 years faced a higher risk, shifting the age of mortality from early to late childhood and adolescence. This study provides valuable insights into mortality risk factors for paediatric SCD patients during acute crises. Early diagnosis, regular follow-up, and therapeutic education are essential to improve patient outcomes and survival rates. These findings contribute to better disease management and targeted interventions, aiming to reduce mortality associated with SCD.
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Affiliation(s)
- Paul Muteb Boma
- Reference Centre for Sickle Cell Disease of Lubumbashi, Research Institute in Health Sciences, Lubumbashi, Democratic Republic of the Congo
| | | | - Junior Makiese Kindundu
- Reference Centre for Sickle Cell Disease of Lubumbashi, Research Institute in Health Sciences, Lubumbashi, Democratic Republic of the Congo
| | - Jean Israël Wela
- National Institute of Statistics, Kinshasa, Democratic Republic of the Congo
| | - Nathalie Lukanke Ngoie
- Provincial General Reference Hospital Jason Sendwe, Lubumbashi, Democratic Republic of the Congo
| | - Valentin Mukeba Ngwamah
- Reference Centre for Sickle Cell Disease of Lubumbashi, Research Institute in Health Sciences, Lubumbashi, Democratic Republic of the Congo
| | - Sandra Mbuyi Tshiswaka
- Provincial General Reference Hospital Jason Sendwe, Lubumbashi, Democratic Republic of the Congo
| | - Joséphine Kalenga Monga
- Provincial General Reference Hospital Jason Sendwe, Lubumbashi, Democratic Republic of the Congo; Department of Pediatrics, Faculty of Medicine, University of Lubumbashi, Lubumbashi, Democratic Republic of the Congo
| | - Jules Mulefu Panda
- Reference Centre for Sickle Cell Disease of Lubumbashi, Research Institute in Health Sciences, Lubumbashi, Democratic Republic of the Congo; Department of Surgery, Faculty of Medicine, University of Lubumbashi, Lubumbashi, Democratic Republic of the Congo
| | - Bruno Bonnechère
- REVAL Rehabilitation Research Center, Faculty of Rehabilitation Sciences, University of Hasselt, Diepenbeek, Belgium; Data Science Institute, University of Hasselt, Diepenbeek, Belgium.
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Belisário AR, Costa JDA, Simões e Silva AC. Natural history of albuminuria in a large cohort of children and adolescents with sickle cell anemia from Brazil. Blood Adv 2024; 8:365-368. [PMID: 38055923 PMCID: PMC10820287 DOI: 10.1182/bloodadvances.2023011765] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2023] [Revised: 11/27/2023] [Accepted: 12/06/2023] [Indexed: 12/08/2023] Open
Affiliation(s)
- André Rolim Belisário
- Centro de Tecidos Biológicos de Minas Gerais, Fundação Centro de Hematologia e Hemoterapia de Minas Gerais, Lagoa Santa, Brazil
- Laboratório Interdisciplinar de Investigação Médica, Faculdade de Medicina, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Jéssica de Almeida Costa
- Laboratório Interdisciplinar de Investigação Médica, Faculdade de Medicina, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Ana Cristina Simões e Silva
- Laboratório Interdisciplinar de Investigação Médica, Faculdade de Medicina, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
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van Dijk MJ, Rab MAE, van Oirschot BA, Bos J, Derichs C, Rijneveld AW, Cnossen MH, Nur E, Biemond BJ, Bartels M, Jans JJM, van Solinge WW, Schutgens REG, van Wijk R, van Beers EJ. One-year safety and efficacy of mitapivat in sickle cell disease: follow-up results of a phase 2, open-label study. Blood Adv 2023; 7:7539-7550. [PMID: 37934880 PMCID: PMC10761354 DOI: 10.1182/bloodadvances.2023011477] [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: 08/18/2023] [Revised: 09/20/2023] [Accepted: 10/12/2023] [Indexed: 11/09/2023] Open
Abstract
Targeting the primary pathogenic event of sickle cell disease (SCD), the polymerization of sickle hemoglobin (HbS), may prevent downstream clinical events. Mitapivat, an oral pyruvate kinase (PK) activator, has therapeutic potential by increasing adenosine triphosphate (ATP) and decreasing 2,3-diphosphoglycerate (2,3-DPG), a glycolytic red blood cell (RBC) intermediate. In the previously reported 8-week dose-finding period of this phase 2, investigator-initiated, open-label study, mitapivat was well tolerated and showed efficacy in SCD. Here, the 1-year fixed-dose extension period is reported in which 9 of 10 included patients (90%) aged ≥16 years with SCD (HbSS, HbS/β0, or HbS/β+) continued with mitapivat. Mostly mild treatment-emergent adverse events (AEs) (most commonly, transaminase increase and headache) were still reported. Apart from the reported nontreatment-related serious AE (SAE) of a urinary tract infection in the dose-finding period, 1 nontreatment-related SAE occurred in the fixed-dose extension period in a patient who died of massive pulmonary embolism due to COVID-19. Importantly, sustained improvement in Hb level (mean increase, 1.1 ± 0.7 g/dL; P = .0014) was seen, which was accompanied by decreases in markers of hemolysis. In addition, the annualized rate of vaso-occlusive events reduced significantly from a historic baseline of 1.33 ± 1.32 to 0.64 ± 0.87 (P = .0489) when combining the dose-finding period and fixed-dose extension period. Cellularly, the ATP:2,3-DPG ratio and Hb-oxygen affinity significantly increased and RBC sickling (point of sickling) nonsignificantly reduced. Overall, this study demonstrated 1-year safety and efficacy of treatment with mitapivat in SCD, supporting further evaluation in ongoing phase 2/3 study (RISE UP, NCT05031780). This trial was registered at https://www.clinicaltrialsregister.eu/ as NL8517 and EudraCT 2019-003438-18.
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Affiliation(s)
- Myrthe J. van Dijk
- Center for Benign Hematology, Thrombosis and Hemostasis - Van Creveldkliniek, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands
- Department of Central Diagnostic Laboratory - Research, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands
| | - Minke A. E. Rab
- Department of Central Diagnostic Laboratory - Research, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands
- Department of Hematology, Erasmus MC, University Medical Center Rotterdam, Rotterdam, The Netherlands
| | - Brigitte A. van Oirschot
- Department of Central Diagnostic Laboratory - Research, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands
| | - Jennifer Bos
- Department of Central Diagnostic Laboratory - Research, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands
| | - Cleo Derichs
- Center for Benign Hematology, Thrombosis and Hemostasis - Van Creveldkliniek, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands
| | - Anita W. Rijneveld
- Department of Hematology, Erasmus MC, University Medical Center Rotterdam, Rotterdam, The Netherlands
| | - Marjon H. Cnossen
- Department of Pediatric Hematology, Erasmus MC Sophia Children's Hospital, University Medical Center Rotterdam, Rotterdam, The Netherlands
| | - Erfan Nur
- Department of Hematology, Amsterdam University Medical Center, University of Amsterdam, Amsterdam, The Netherlands
- Department of Blood Cell Research, Sanquin Research, Amsterdam, The Netherlands
| | - Bart J. Biemond
- Department of Hematology, Amsterdam University Medical Center, University of Amsterdam, Amsterdam, The Netherlands
| | - Marije Bartels
- Center for Benign Hematology, Thrombosis and Hemostasis - Van Creveldkliniek, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands
| | - Judith J. M. Jans
- Section Metabolic Diagnostics, Department of Genetics, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands
| | - Wouter W. van Solinge
- Department of Central Diagnostic Laboratory - Research, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands
| | - Roger E. G. Schutgens
- Center for Benign Hematology, Thrombosis and Hemostasis - Van Creveldkliniek, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands
| | - Richard van Wijk
- Department of Central Diagnostic Laboratory - Research, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands
| | - Eduard J. van Beers
- Center for Benign Hematology, Thrombosis and Hemostasis - Van Creveldkliniek, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands
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6
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Xu JZ. Pyruvate kinase activators: targeting red cell metabolism in sickle cell disease. HEMATOLOGY. AMERICAN SOCIETY OF HEMATOLOGY. EDUCATION PROGRAM 2023; 2023:107-113. [PMID: 38066891 PMCID: PMC10727103 DOI: 10.1182/hematology.2023000467] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2023]
Abstract
Hemoglobin S (HbS) polymerization, red blood cell (RBC) sickling, chronic anemia, and vaso-occlusion are core to sickle cell disease (SCD) pathophysiology. Pyruvate kinase (PK) activators are a novel class of drugs that target RBC metabolism by reducing the buildup of the glycolytic intermediate 2,3-diphosphoglycerate (2,3-DPG) and increasing production of adenosine triphosphate (ATP). Lower 2,3-DPG level is associated with an increase in oxygen affinity and reduction in HbS polymerization, while increased RBC ATP may improve RBC membrane integrity and survival. There are currently 3 PK activators in clinical development for SCD: mitapivat (AG-348), etavopivat (FT-4202), and the second-generation molecule AG-946. Preclinical and clinical data from these 3 molecules demonstrate the ability of PK activators to lower 2,3-DPG levels and increase ATP levels in animal models and patients with SCD, as well as influence a number of potential pathways in SCD, including hemoglobin oxygen affinity, RBC sickling, RBC deformability, RBC hydration, inflammation, oxidative stress, hypercoagulability, and adhesion. Furthermore, early-phase clinical trials of mitapivat and etavopivat have demonstrated the safety and tolerability of PK activators in patients with SCD, and phase 2/3 trials for both drugs are ongoing. Additional considerations for this novel therapeutic approach include the balance between increasing hemoglobin oxygen affinity and tissue oxygen delivery, the cost and accessibility of these drugs, and the potential of multimodal therapy with existing and novel therapies targeting different disease mechanisms in SCD.
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Affiliation(s)
- Julia Z. Xu
- Division of Hematology/Oncology, Department of Medicine, University of Pittsburgh, Pittsburgh, PA, USA
- Heart, Lung and Blood Vascular Medicine Institute, University of Pittsburgh, Pittsburgh, PA, USA
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Hakami F, Alhazmi E, Busayli WM, Althurwi S, Darraj AM, Alamir MA, Hakami A, Othman RA, Moafa AI, Mahasi HA, Madkhali MA. Overview of the Association Between the Pathophysiology, Types, and Management of Sickle Cell Disease and Stroke. Cureus 2023; 15:e50577. [PMID: 38107212 PMCID: PMC10723021 DOI: 10.7759/cureus.50577] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/14/2023] [Indexed: 12/19/2023] Open
Abstract
Sickle cell disease (SCD) is a genetic blood disorder that affects hemoglobin and increases stroke risk, particularly in childhood. This review examines the pathophysiological association between SCD and stroke, the classification of stroke types, risk factors, diagnosis, management, prevention, and prognosis. A comprehensive literature search was conducted via PubMed, Scopus, and Cochrane databases. Relevant studies on SCD and stroke pathophysiology, classification, epidemiology, diagnosis, treatment, and prevention were identified. Sickle cell disease causes red blood cells to become rigid and sickle-shaped, obstructing blood vessels. Recurrent sickling alters cerebral blood flow and damages vessel walls, often leading to ischemic or hemorrhagic strokes (HS). These occur most frequently in childhood, with ischemic strokes (IS) being more common. Key risk factors include a prior transient ischemic attack (TIA), low hemoglobin, and a high leukocyte count. Neuroimaging is essential for diagnosis and determining stroke type. Primary prevention centers on blood transfusions and hydroxyurea for those at high risk. Acute treatment involves promptly restoring blood flow and managing complications. However, significant knowledge gaps remain regarding stroke mechanisms, optimizing screening protocols, and improving long-term outcomes. This review synthesizes current evidence on SCD and stroke to highlight opportunities for further research and standardizing care protocols across institutions. Ultimately, a holistic perspective is critical for mitigating the high risk of debilitating strokes in this vulnerable patient population.
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Affiliation(s)
- Faisal Hakami
- Medicine, Faculty of Medicine, Jazan University, Jazan, SAU
| | - Essam Alhazmi
- Medicine, Faculty of Medicine, Jazan University, Jazan, SAU
| | - Wafa M Busayli
- Medicine, Faculty of Medicine, Jazan University, Jazan, SAU
| | | | | | | | - Alyaj Hakami
- Medicine, Faculty of Medicine, Jazan University, Jazan, SAU
| | - Renad A Othman
- Medicine, Faculty of Medicine, Jazan University, Jazan, SAU
| | - Amal I Moafa
- Medicine, Faculty of Medicine, Jazan University, Jazan, SAU
| | | | - Mohammed Ali Madkhali
- Internal Medicine, and Hematology and Oncology, Faculty of Medicine, Jazan University, Jazan, SAU
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Di Mauro M, El Hoss S, Nardo-Marino A, Stuart-Smith S, Strouboulis J, Gibson JS, Rees DC, Brewin JN. Males with sickle cell disease have higher risks of cerebrovascular disease, increased inflammation, and a reduced response to hydroxyurea. Am J Hematol 2023; 98:E341-E344. [PMID: 37646569 DOI: 10.1002/ajh.27074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Revised: 08/09/2023] [Accepted: 08/14/2023] [Indexed: 09/01/2023]
Abstract
Biological sex is important. Male sex is associated with worse outcomes in most measures, including cerebrovascular disease, hospital admissions, and blood transfusions, but not survival. Females also appear to have a better response to hydroxyurea therapy, reduced markers of inflammation, and better liver function.
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Affiliation(s)
- Margherita Di Mauro
- Department of Haematological Medicine, King's College Hospital, London, UK
- Red Cell Haematology Laboratory, Comprehensive Cancer Centre, School of Cancer and Pharmaceutical Sciences, King's College London, London, UK
- Department of Systems Medicine, University of Rome Tor Vergata, Rome, Italy
| | - Sara El Hoss
- Red Cell Haematology Laboratory, Comprehensive Cancer Centre, School of Cancer and Pharmaceutical Sciences, King's College London, London, UK
| | - Amina Nardo-Marino
- Department of Haematological Medicine, King's College Hospital, London, UK
- Red Cell Haematology Laboratory, Comprehensive Cancer Centre, School of Cancer and Pharmaceutical Sciences, King's College London, London, UK
- Centre for Haemoglobinopathies, Department of Haematology, Copenhagen University Hospital (Rigshospitalet), Copenhagen, Denmark
| | - Sara Stuart-Smith
- Department of Haematological Medicine, King's College Hospital, London, UK
| | - John Strouboulis
- Red Cell Haematology Laboratory, Comprehensive Cancer Centre, School of Cancer and Pharmaceutical Sciences, King's College London, London, UK
| | - John S Gibson
- Department of Veterinary Medicine, University of Cambridge, Cambridge, UK
| | - David C Rees
- Department of Haematological Medicine, King's College Hospital, London, UK
- Red Cell Haematology Laboratory, Comprehensive Cancer Centre, School of Cancer and Pharmaceutical Sciences, King's College London, London, UK
| | - John N Brewin
- Department of Haematological Medicine, King's College Hospital, London, UK
- Red Cell Haematology Laboratory, Comprehensive Cancer Centre, School of Cancer and Pharmaceutical Sciences, King's College London, London, UK
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Zahr RS, Saraf SL. Sickle Cell Disease and CKD: An Update. Am J Nephrol 2023; 55:56-71. [PMID: 37899028 PMCID: PMC10872505 DOI: 10.1159/000534865] [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: 09/28/2023] [Accepted: 10/25/2023] [Indexed: 10/31/2023]
Abstract
BACKGROUND Sickle cell disease is an inherited red blood cell disorder that affects approximately 100,000 people in the USA and 25 million people worldwide. Vaso-occlusion and chronic hemolysis lead to dysfunction of vital organ systems, with the kidneys being among the most commonly affected organs. SUMMARY Early renal manifestations include medullary ischemia with the loss of urine-concentrating ability and hyperfiltration. This can be followed by progressive damage characterized by persistent albuminuria and a decline in the estimated glomerular filtration rate. The risk of sickle nephropathy is greater in those with the APOL1 G1 and G2 kidney risk variants and variants in HMOX1 and lower in those that coinherit α-thalassemia. Therapies to treat sickle cell disease-related kidney damage focus on sickle cell disease-modifying therapies (e.g., hydroxyurea) or those adopted from the nonsickle cell disease kidney literature (e.g., renin-angiotensin-aldosterone system inhibitors), although data on their clinical efficacy are limited to small studies with short follow-up periods. Kidney transplantation for end-stage kidney disease improves survival compared to hemodialysis but is underutilized in this patient population. KEY MESSAGES Kidney disease is a major contributor to early mortality, and more research is needed to understand the pathophysiology and develop targeted therapies to improve kidney health in sickle cell disease.
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Affiliation(s)
- Rima S. Zahr
- Division of Pediatric Nephrology and Hypertension, University of Tennessee Health Science Center, Memphis, TN
| | - Santosh L. Saraf
- Division of Hematology & Oncology, University of Illinois Chicago, Chicago, IL
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10
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Galacteros F, Ethgen O, Beillat M. Modeling the public health impact of voxelotor in the management of sickle cell disease in France. PLoS One 2023; 18:e0291211. [PMID: 37703228 PMCID: PMC10499253 DOI: 10.1371/journal.pone.0291211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2023] [Accepted: 08/23/2023] [Indexed: 09/15/2023] Open
Abstract
Sickle cell disease (SCD) is an inherited blood disorder in which sickle hemoglobin (HbS) polymerizes, leading to red blood cell sickling and chronic hemolytic anemia, vaso-occlusive crises, and end-organ damage associated with early mortality. Despite standard of care, patients with SCD still experience complications and early mortality, highlighting remaining unmet treatment needs. Voxelotor is a first-in-class HbS polymerization inhibitor approved by the US Food and Drug Administration as a treatment for SCD and by the European Medicines Agency for hemolytic anemia due to SCD. In clinical studies, voxelotor has been shown to increase hemoglobin (Hb) and decrease hemolytic markers in patients with SCD. The objective of this study was to estimate the impact of voxelotor on the burden of SCD in France using a modeling approach, accounting for its anticipated adoption and diffusion over the next 5 years. We designed a sequential multi-cohort model to project and compare the cumulative incidence of SCD complications over a 20-year time horizon in a world with and without voxelotor. A distribution of patients was simulated across various levels of Hb response based on the phase 3 HOPE trial results, and relative risk reduction was adjusted using published meta-analysis results that projected risk reduction due to a 1 g/dL increase in Hb. In 6100 modeled patients with SCD treated with voxelotor, the model projected the number of deaths to decrease by 39.4%, with an increase of 1.8% in life-years gained. The model also projected life expectancy to increase by 15.8%, and incident cases of stroke, pulmonary hypertension, and chronic kidney disease to decrease by 19.8%, 24.5%, and 25.1%, respectively. The model suggests that improving Hb using a treatment such as voxelotor may have a positive public health impact by reducing the burden of SCD for patients and the healthcare system.
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Affiliation(s)
- Frédéric Galacteros
- Unité des Maladies Génétiques du Globule Rouge, CHU Henri Mondor, Créteil, France
| | - Olivier Ethgen
- SERFAN Innovation, Namur, Belgium
- Department of Public Health, Epidemiology & Health Economics, University of Liège, Liège, Belgium
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11
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Obadina M, Wilson S, Derebail VK, Little J. Emerging Therapies and Advances in Sickle Cell Disease with a Focus on Renal Manifestations. KIDNEY360 2023; 4:997-1005. [PMID: 37254256 PMCID: PMC10371301 DOI: 10.34067/kid.0000000000000162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2023] [Accepted: 04/25/2023] [Indexed: 06/01/2023]
Abstract
The underlying mechanisms of disease in sickle cell disease (SCD) contribute to a multifaceted nephropathy, commonly manifested as albuminuria. In severe SCD genotypes ( e.g. , Hemoglobin SS [HbSS]), albuminuria and CKD are major predictors of mortality in this population. Therefore, the monitoring and management of renal function is an intrinsic part of comprehensive care in SCD. Management of nephropathy in SCD can be accomplished with SCD-directed therapies and/or CKD-directed therapies. In the past 5 years, novel disease-modifying and palliative therapies have been approved in SCD to target aspects of the disease, such as anemia, inflammation, and vasculopathy. Along with conventional hydroxyurea and chronic transfusion, l -glutamine, crizanlizumab, and voxelotor have all been shown to mitigate some adverse effect of SCD, and their effect on nephropathy is being investigated. CKD-directed therapies such as renin-angiotensin-aldosterone system blockers have long been used in SCD nephropathy; however, more complete long-term studies on benefits are needed. Given the effect of renal disease on survival, further assessment of the mechanisms and efficacy of these SCD-directed or CKD-directed therapeutic agents is essential.
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Affiliation(s)
- Mofiyin Obadina
- Division of Hematology, Department of Medicine, University of North Carolina, Chapel Hill, North Carolina
| | - Sam Wilson
- Division of Hematology, Department of Medicine, University of North Carolina, Chapel Hill, North Carolina
- UNC Blood Research Center, University of North Carolina, Chapel Hill, North Carolina
| | - Vimal K. Derebail
- Division of Nephrology and Hypertension, Department of Medicine, University of North Carolina, Chapel Hill, North Carolina
| | - Jane Little
- Division of Hematology, Department of Medicine, University of North Carolina, Chapel Hill, North Carolina
- UNC Blood Research Center, University of North Carolina, Chapel Hill, North Carolina
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12
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Yilmaz B, Somay E, Topkan E, Pehlivan B, Selek U. Pre-chemoradiotherapy low hemoglobin levels indicate increased osteoradionecrosis risk in locally advanced nasopharyngeal cancer patients. Eur Arch Otorhinolaryngol 2023; 280:2575-2584. [PMID: 36749372 DOI: 10.1007/s00405-023-07864-7] [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: 01/02/2023] [Accepted: 01/27/2023] [Indexed: 02/08/2023]
Abstract
PURPOSE We aimed to determine whether pretreatment hemoglobin (Hb) levels can predict the risk of osteoradionecrosis (ORN) in patients receiving concurrent chemoradiotherapy (CCRT) for locally advanced nasopharyngeal carcinoma (LA-NPC). METHODS ORN cases were identified from the records of LA-NPCs who had oral exams before and after CCRT. All Hb measurements were obtained on the first day of treatment. Receiving operating characteristic curve analysis was used to determine the relationship between Hb levels and ORN rates. The relationship between pretreatment Hb levels and ORN rates served as the primary endpoint, and secondary endpoints included the discovery of additional potential ORN risk factors. RESULTS Among the 263 eligible LA-NPCs, we identified 8.7% ORN cases. The ideal cutoff Hb before CCRT was 10.6 g/dL. It was revealed that HPR ≤ 10.6 group had a significantly higher ORN rate (32.5% vs. 1.5% for Hb > 10.6; P < 0.001). The mandibular V59.8 ≥ 36% Gy, pre-CCRT ≥ 4 tooth extractions, the presence of post-CCRT tooth extractions, and the time of post-CCRT tooth extractions > 8 months were the other factors associated with significantly increased ORN rates (P < 0.05 for each). CONCLUSION Low pre-CCRT Hb levels appeared to be independently linked to significantly higher ORN rates. Pretreatment Hb levels may be used to establish preventive measures and predict ORN.
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Affiliation(s)
- Busra Yilmaz
- Department of Oral and Maxillofacial Radiology, Faculty of Dentistry, Baskent University, Ankara, Turkey.
| | - Efsun Somay
- Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Baskent University, Adana, Turkey
| | - Erkan Topkan
- Department of Radiation Oncology, Faculty of Medicine, Baskent University, Adana, Turkey
| | - Berrin Pehlivan
- Department of Radiation Oncology, Bahcesehir University, Istanbul, Turkey
| | - Ugur Selek
- Department of Radiation Oncology, School of Medicine, Koc University, Istanbul, Turkey.,Department of Radiation Oncology, MD Anderson Cancer Center, The University of Texas, Houston, TX, USA
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13
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Ershler WB, De Castro LM, Pakbaz Z, Moynahan A, Weycker D, Delea TE, Agodoa I, Cong Z. Hemoglobin and End-Organ Damage in Individuals with Sickle Cell Disease. CURRENT THERAPEUTIC RESEARCH 2023; 98:100696. [PMID: 36950457 PMCID: PMC10025127 DOI: 10.1016/j.curtheres.2023.100696] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2022] [Accepted: 02/12/2023] [Indexed: 02/25/2023]
Abstract
Background Sickle cell disease (SCD) is an inherited, chronic, multifaceted blood disorder. Patients with SCD develop anemia, which has been associated with end-organ damage (EOD). Objectives This retrospective, observational, repeated-measures study systematically characterizes the relationship between hemoglobin (Hb) level and EOD in adolescent and adult patients with SCD. Methods The study population comprised patients with SCD aged ≥12 years with available Hb data from a US provider-centric health care database. For each patient, each Hb value over time was included as a separate observation. Study outcomes-the onset of any new EOD, including chronic kidney disease, pulmonary hypertension, stroke, and leg ulcer-were ascertained during the 1-year period after each Hb assessment. The association between Hb levels and risk of new EOD was estimated using multivariable generalized estimating equations. Results A total of 16,043 unique patients with SCD contributed 44,913 observations. Adjusted odds of any EOD during the 1-year follow-up were significantly lower with higher Hb level. Risk reductions with higher Hb levels for chronic kidney disease, pulmonary hypertension, and leg ulcer were comparable. The risk of new EOD was significantly lower among adolescent and adult patients with higher Hb levels. Conclusions In patients with SCD, higher Hb levels are associated with a reduced risk of developing EOD. Therapeutic strategies that result in higher Hb levels may offer clinical and economic value for patients with SCD. (Curr Ther Res Clin Exp. 2023; 84:XXX-XXX).
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Affiliation(s)
- William B. Ershler
- Department of Hematology, Inova Schar Cancer Institute, Fairfax, Virginia
- Address correspondence to: William B. Ershler, MD, Inova Schar Cancer Institute, 8081 Innovation Park Dr, Suite 4408, Fairfax, VA 22031 (W. Ershler).
| | - Laura M. De Castro
- Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Zahra Pakbaz
- Division of Hematology/Oncology, UC Irvine Chao Family Cancer Center, Orange, California
| | | | | | | | - Irene Agodoa
- Global Blood Therapeutics, Inc., South San Francisco, California
| | - Ze Cong
- Global Blood Therapeutics, Inc., South San Francisco, California
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14
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Hong K, Kisiju T, Kim J, Chun BC. Cardio-cerebrovascular complications in COVID-19 patients: A retrospective cohort study. Front Med (Lausanne) 2022; 9:1045274. [PMID: 36619633 PMCID: PMC9813409 DOI: 10.3389/fmed.2022.1045274] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2022] [Accepted: 12/08/2022] [Indexed: 12/24/2022] Open
Abstract
Background Recent studies have highlighted the cardio-cerebrovascular manifestations of coronavirus disease 2019 (COVID-19). Objective This study aimed to analyze the likelihood of cardiovascular and cerebrovascular manifestations among patients with COVID-19-positive individuals in South Korea. Methods A cohort database for COVID-19 from the National Health Insurance Service was used which included patients diagnosed with COVID-19 between January 1 and June 4, 2020. Individuals who tested COVID-19 positive, notwithstanding the severity of the disease, were designated as cases. COVID-19- negative individuals were used as controls for the study. The exclusion criteria included people who had a history of cardiovascular and cerebrovascular diseases between 2015 and 2019. A new diagnosis of cardiovascular and cerebrovascular complications was considered the primary endpoint. The adjusted incidence rate ratio (IRR) of development of complications was estimated using log-link Poisson regression. The model was adjusted at two levels, the first one included age and sex while the second included age, sex, residence area, and level of income. The hazard ratio (HR) was estimated using Cox-proportional hazard regression analysis while adjusting for all demographic variables and covariates. Results Significant results were obtained for acute conditions, such as ischemic heart disease and cerebral hemorrhage. The IRR of COVID-19- positive individuals compared with that of controls for the diagnosis of ischemic heart disease was 1.78 (1.57-2.02; 95% confidence interval [CI]) when adjusted for age and sex. HR was calculated as 3.02 (2.19-4.17; 95% CI) after adjusting for the covariates. In case of cerebral hemorrhage, the adjusted IRR was 2.06 (1.25-3.40; 95% CI) and the adjusted HR was 4.08 (0.90-19.19; 95% CI). Conclusion The findings of our study suggest that COVID-19 infection can be a significant risk factor for acute cardiovascular complications, such as ischemic heart disease and acute cerebrovascular complications, such as cerebral infarction, after properly adjusting for covariates.
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Affiliation(s)
- Kwan Hong
- Department of Public Health, Korea University Graduate School, Seoul, Republic of Korea,Department of Preventive Medicine, Korea University College of Medicine, Seoul, Republic of Korea
| | - Trishna Kisiju
- Department of Public Health, Korea University Graduate School, Seoul, Republic of Korea,Department of Preventive Medicine, Korea University College of Medicine, Seoul, Republic of Korea
| | - Jeehyun Kim
- Department of Public Health, Korea University Graduate School, Seoul, Republic of Korea,Department of Preventive Medicine, Korea University College of Medicine, Seoul, Republic of Korea,Department of Healthcare Sciences, Graduate School, Transdisciplinary Major in Learning Health Systems, Korea University, Seoul, Republic of Korea
| | - Byung Chul Chun
- Department of Public Health, Korea University Graduate School, Seoul, Republic of Korea,Department of Preventive Medicine, Korea University College of Medicine, Seoul, Republic of Korea,Department of Healthcare Sciences, Graduate School, Transdisciplinary Major in Learning Health Systems, Korea University, Seoul, Republic of Korea,*Correspondence: Byung Chul Chun,
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15
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Xu JZ, Conrey A, Frey I, Gwaabe E, Menapace LA, Tumburu L, Lundt M, Lequang T, Li Q, Glass K, Dunkelberger EB, Iyer V, Mangus H, Kung C, Dang L, Kosinski PA, Hawkins P, Jeffries N, Eaton WA, Lay Thein S. A phase 1 dose escalation study of the pyruvate kinase activator mitapivat (AG-348) in sickle cell disease. Blood 2022; 140:2053-2062. [PMID: 35576529 PMCID: PMC9837441 DOI: 10.1182/blood.2022015403] [Citation(s) in RCA: 29] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2022] [Accepted: 05/11/2022] [Indexed: 01/21/2023] Open
Abstract
Polymerization of deoxygenated hemoglobin S underlies the pathophysiology of sickle cell disease (SCD). In activating red blood cell pyruvate kinase and glycolysis, mitapivat (AG-348) increases adenosine triphosphate (ATP) levels and decreases the 2,3-diphosphoglycerate (2,3-DPG) concentration, an upstream precursor in glycolysis. Both changes have therapeutic potential for patients with SCD. Here, we evaluated the safety and tolerability of multiple ascending doses of mitapivat in adults with SCD with no recent blood transfusions or changes in hydroxyurea or l-glutamine therapy. Seventeen subjects were enrolled; 1 subject was withdrawn shortly after starting the study. Sixteen subjects completed 3 ascending dose levels of mitapivat (5, 20, and 50 mg, twice daily [BID]) for 2 weeks each; following a protocol amendment, the dose was escalated to 100 mg BID in 9 subjects. Mitapivat was well tolerated at all dose levels, with the most common treatment-emergent adverse events (AEs) being insomnia, headache, and hypertension. Six serious AEs (SAEs) included 4 vaso-occlusive crises (VOCs), non-VOC-related shoulder pain, and a preexisting pulmonary embolism. Two VOCs occurred during drug taper and were possibly drug related; no other SAEs were drug related. Mean hemoglobin increase at the 50 mg BID dose level was 1.2 g/dL, with 9 of 16 (56.3%) patients achieving a hemoglobin response of a ≥1 g/dL increase compared with baseline. Mean reductions in hemolytic markers and dose-dependent decreases in 2,3-DPG and increases in ATP were also observed. This study provides proof of concept that mitapivat has disease-modifying potential in patients with SCD. This trial was registered at www.clinicaltrials.gov as #NCT04000165.
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Affiliation(s)
- Julia Z. Xu
- Sickle Cell Branch, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD
| | - Anna Conrey
- Sickle Cell Branch, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD
| | - Ingrid Frey
- Sickle Cell Branch, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD
| | - Eveline Gwaabe
- Sickle Cell Branch, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD
| | - Laurel A. Menapace
- Sickle Cell Branch, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD
| | - Laxminath Tumburu
- Sickle Cell Branch, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD
| | - Maureen Lundt
- Sickle Cell Branch, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD
| | - Timothy Lequang
- Sickle Cell Branch, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD
| | - Quan Li
- Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD
| | - Kristen Glass
- Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD
| | - Emily B. Dunkelberger
- Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD
| | | | | | | | - Lenny Dang
- Agios Pharmaceuticals, Inc., Cambridge, MA
| | | | | | - Neal Jeffries
- Office of Biostatistics Research, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD
| | - William A. Eaton
- Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD
| | - Swee Lay Thein
- Sickle Cell Branch, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD
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16
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Treadwell MJ, Mushiana S, Badawy SM, Preiss L, King AA, Kroner B, Chen Y, Glassberg J, Gordeuk V, Shah N, Snyder A, Wun T. An evaluation of patient-reported outcomes in sickle cell disease within a conceptual model. Qual Life Res 2022; 31:2681-2694. [PMID: 35445915 PMCID: PMC9356962 DOI: 10.1007/s11136-022-03132-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/21/2022] [Indexed: 11/28/2022]
Abstract
PURPOSE To examine the relations between patient-reported outcomes (PROs) within a conceptual model for adults with sickle cell disease (SCD) ages 18 - 45 years enrolled in the multi-site Sickle Cell Disease Implementation Consortium (SCDIC) registry. We hypothesized that patient and SCD-related factors, particularly pain, and barriers to care would independently contribute to functioning as measured using PRO domains. METHODS Participants (N = 2054) completed a 48-item survey including socio-demographics and PRO measures, e.g., social functioning, pain impact, emotional distress, and cognitive functioning. Participants reported on lifetime SCD complications, pain episode frequency and severity, and barriers to healthcare. RESULTS Higher pain frequency was associated with higher odds of worse outcomes in all PRO domains, controlling for age, gender and site (OR range 1.02-1.10, 95% CI range [1.004-1.12]). Reported history of treatment for depression was associated with 5 of 7 PRO measures (OR range 1.58-3.28 95% CI range [1.18-4.32]). Fewer individual barriers to care and fewer SCD complications were associated with better outcomes in the emotion domain (OR range 0.46-0.64, 95% CI range [0.34-0.86]). CONCLUSIONS Study results highlight the importance of the biopsychosocial model to enhance understanding of the needs of this complex population, and to design multi-dimensional approaches for providing more effective interventions to improve outcomes.
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Affiliation(s)
- Marsha J Treadwell
- University of California San Francisco Benioff Children's Hospital Oakland, 747 52nd Street, Oakland, CA, 94609, USA.
| | | | - Sherif M Badawy
- Anne & Robert H. Lurie Children's Hospital of Chicago, Chicago, IL, USA
- Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | - Liliana Preiss
- Research Triangle International, Research Triangle Park, NC, USA
| | | | - Barbara Kroner
- Research Triangle International, Research Triangle Park, NC, USA
| | - Yumei Chen
- University of California San Francisco Benioff Children's Hospital Oakland, 747 52nd Street, Oakland, CA, 94609, USA
| | | | | | | | | | - Theodore Wun
- University of California Davis, Sacramento, CA, USA
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Abstract
Sickle cell disease (SCD) is characterized by variable clinical outcomes, with some patients suffering life-threatening complications during childhood, and others living relatively symptom-free into old age. Because of this variability, there is an important potential role for precision medicine, in which particular different treatments are selected for different groups of patients. However, the application of precision medicine in SCD is limited by difficulties in identifying different prognostic groups and the small number of available treatments. The main genetic determinant of outcomes in SCD is the underlying β-globin genotype, with sickle cell anemia (HbSS) and hemoglobin SC disease (HbSC) forming the 2 major forms of the disease in most populations of African origin. Although there are clear differences in clinical outcomes between these conditions, treatments approaches are very similar, with little evidence on how to treat HbSC in particular. Other genomic information, such as the co-inheritance of α-thalassemia, or high fetal hemoglobin (HbF) levels, is of some prognostic value but insufficient to determine treatments. Precision medicine is further limited by the fact that the 2 main drugs used in SCD, penicillin and hydroxyurea, are currently recommended for all patients. Newer treatments, such as crizanlizumab and voxelotor, raise the possibility that groups will emerge who respond best to particular drugs or combinations. Perhaps the best current example of precision medicine in SCD is the selective use of blood transfusions as primary stroke prevention in children with evidence of cerebral vasculopathy. More precise treatments may emerge as we understand more about the pathology of SCD, including problems with erythropoiesis.
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18
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Characteristics and outcomes of stroke hospitalizations in patients with sickle cell disease and moyamoya syndrome. J Stroke Cerebrovasc Dis 2022; 31:106705. [PMID: 35964532 DOI: 10.1016/j.jstrokecerebrovasdis.2022.106705] [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: 06/07/2022] [Revised: 08/01/2022] [Accepted: 08/03/2022] [Indexed: 11/21/2022] Open
Abstract
OBJECTIVES Stroke is the leading cause of death in patients with Sickle cell disease (SCD). Here, we detail the burden of Moyamoya syndrome (MMS) as a cause of stroke in patients with SCD. MATERIALS AND METHODS A review of SCD-related hospital discharges was conducted utilizing the National Inpatient Sample. Rates of stroke hospitalization, risk factors, procedures, and outcomes were compared between patients with SCD-MMS and SCD alone. Univariate analyses including T-test, Wilcoxon Rank-Sum test, Chi-square were performed to compare risk factors and outcomes. Multivariable regression was used to identify predictors of stroke unique to each population. RESULTS Stroke occurred in 9.8% of SCD-MMS hospitalizations versus 0.5% of those involving patients with SCD alone (OR = 20.71, p < 0.001). Patients with SCD-MMS developed stroke at younger ages and with fewer comorbidities compared to those with SCD alone. Stroke hospitalizations in SCD-MMS involved a greater number of procedures (90.5% vs. 79.3%, p = 0.007), but were more likely to result in favorable discharge (58.5% vs. 44.2%, p = 0.005). The presence of anemia during hospitalization was a significant risk factor for stroke in both cohorts. Long-term antiplatelet use was protective against stroke (OR = 0.42, p = 0.008) only in the SCD-MMS cohort. CONCLUSIONS MMS confers a 20-fold increased risk of stroke among patients with SCD and appears to be an important cause of recurrent stroke in this population. Anemia is one of the most significant risk factors for stroke, while antiplatelet use appears to confer a protective benefit.
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19
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Modolo GP, Luvizutto GJ, Hamamoto Filho PT, Braga GP, Bazan SGZ, Ferreira NC, de Souza JT, Winckler FC, Macedo de Freitas CC, Hokama NK, Vidal EIDO, Bazan R. Transcranial doppler as screening method for sickling crises in children with sickle cell anemia: a latin America cohort study. BMC Pediatr 2022; 22:368. [PMID: 35761209 PMCID: PMC9235247 DOI: 10.1186/s12887-022-03429-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/27/2021] [Accepted: 06/03/2022] [Indexed: 11/13/2022] Open
Abstract
Background Sickle cell anemia (SCA) is the leading cause of childhood stroke. We aimed to evaluate whether altered cerebral flow velocities, as measured by transcranial Doppler (TCD), are associated with vaso-occlusive complications in addition to stroke in pediatric SCA patients. Methods We evaluated 37 children aged between 2 and 16 years with SCA who underwent screening for TCD between January 2012 and October 2018. Genotypic profiles and demographic data were collected, TCD examinations were performed during follow-up, and the presence of sickling crises was compared. Survival analyses were performed using simple frailty models, in which each predictor variable was analyzed separately in relation to the occurrence of a sickling crisis. Results The variables related to sickle cell crises in the univariate analysis were peak systolic velocity (PSV) in the middle cerebral artery (MCA), hazard ratio (HR) 1.01 (1.00—1.02) p = 0.04; end-diastolic velocity (EDV) in the MCA, HR 1.02 (1.01—1.04) p = 0.01; time average mean maximum velocity (TAMMV) in the basilar artery (BA), HR 1.02 (1.00—1.04) p = 0.04; hemoglobin, HR 0.49 (0.38—0.65) p < 0.001; hematocrit, HR 0.78 (0.71—0.85) p < 0.001; leukocyte counts, HR 1.1 (1.05—1.15) p < 0.001; platelets counts, HR 0.997 (0.994—0.999) p = 0.02; and reticulocyte numbers, HR 1.14 (1.06—1.23) p < 0.001. Conclusions Our results indicate PSV and EDV in the MCA and TAMMV in the BA as markers of risk for the occurrence of sickling crises in SCA. Supplementary Information The online version contains supplementary material available at 10.1186/s12887-022-03429-5.
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20
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Revisiting anemia in sickle cell disease and finding the balance with therapeutic approaches. Blood 2022; 139:3030-3039. [PMID: 35587865 DOI: 10.1182/blood.2021013873] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Accepted: 12/05/2021] [Indexed: 11/20/2022] Open
Abstract
Chronic hemolytic anemia and intermittent acute pain episodes are the 2 hallmark characteristics of sickle cell disease (SCD). Anemia in SCD not only signals a reduction of red cell mass and oxygen delivery, but also ongoing red cell breakdown and release of cell-free hemoglobin, which together contribute to a number of pathophysiological responses and play a key role in the pathogenesis of cumulative multiorgan damage. However, although anemia is clearly associated with many detrimental outcomes, it may also have an advantage in SCD in lowering risks of potential viscosity-related complications. Until recently, clinical drug development for SCD has predominantly targeted a reduction in the frequency of vaso-occlusive crises as an endpoint, but increasingly, more attention is being directed toward addressing the contribution of chronic anemia to poor outcomes in SCD. This article aims to explore the complex pathophysiology and mechanisms of anemia in SCD, as well as the need to balance the benefits of raising hemoglobin levels with the potential risks of increasing blood viscosity, in the context of the current therapeutic landscape for anemia in SCD.
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21
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Smith WR, McClish DK, Bovbjerg VE, Singh HK. Development and validation of the sickle cell stress scale-adult. Eur J Haematol Suppl 2022; 109:215-225. [PMID: 35585659 PMCID: PMC9531901 DOI: 10.1111/ejh.13789] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Revised: 05/11/2022] [Accepted: 05/13/2022] [Indexed: 11/28/2022]
Abstract
Disease‐specific stress can partly explain Sickle Cell Disease (SCD) healthcare utilization. We developed and validated two measures of adult SCD‐specific stress for research and clinical care. A large cohort of adults with SCD completed both the 3‐item Likert‐scale adapted from a previous disease stress measure and a 10‐item Likert‐scale questionnaire drafted specifically to measure SCD stress. They concurrently completed a psychosocial and health‐related quality of life scale battery, then subsequently daily pain diaries. Diaires measured: daily intensity, distress and interference of pain; self‐defined vaso‐occlusive crises (VOC), opioid use, and types of healthcare utilization for up to 24 weeks. Analyses tested Cronbach's alpha, correlation of the three‐item and 10‐item stress scales with the concurrent battery, with percentages of pain days, VOC days, opioid use days, and healthcare utilization days, and correlation of baseline stress and 6‐month stress for the 10‐item scale. Cronbach's alpha was high for both the 3‐item (0.73) and 10‐item (0.83) SCD stress scales, test–retest correlation of 0.55, expected correlation with the concurrent battery, and correlation with diary‐measured healthcare utilization over 6 months. The correlations with the 3‐item scale were stronger, but only statistically significant for depression‐anxiety. The correlation between the two stress scales was 0.59. Both the 3‐item and the 10‐item stress scales exhibited good face, construct, concurrent, and predictive validity as well as moderate test–retest reliability. Further scale validation should determine population norms and response to interventions.
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Affiliation(s)
- Wally R Smith
- Section of Research, Division of General Internal Medicine, Virginia Commonwealth University, Richmond, Virginia, USA
| | - Donna K McClish
- Department of Biostatistics, Virginia Commonwealth University, Richmond, Virginia, USA
| | - Viktor E Bovbjerg
- College of Health and Human Sciences, Oregon State University, Corvallis, Oregon, USA
| | - Harjot K Singh
- Division of Infectious Diseases, Weill Cornell Medicine, New York, New York, USA
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22
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Dagenais S, Russo L, Madsen A, Webster J, Becnel L. Use of Real-World Evidence to Drive Drug Development Strategy and Inform Clinical Trial Design. Clin Pharmacol Ther 2022; 111:77-89. [PMID: 34839524 PMCID: PMC9299990 DOI: 10.1002/cpt.2480] [Citation(s) in RCA: 42] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2021] [Accepted: 10/30/2021] [Indexed: 12/28/2022]
Abstract
Interest in real-world data (RWD) and real-world evidence (RWE) to expedite and enrich the development of new biopharmaceutical products has proliferated in recent years, spurred by the 21st Century Cures Act in the United States and similar policy efforts in other countries, willingness by regulators to consider RWE in their decisions, demands from third-party payers, and growing concerns about the limitations of traditional clinical trials. Although much of the recent literature on RWE has focused on potential regulatory uses (e.g., product approvals in oncology or rare diseases based on single-arm trials with external control arms), this article reviews how biopharmaceutical companies can leverage RWE to inform internal decisions made throughout the product development process. Specifically, this article will review use of RWD to guide pipeline and portfolio strategy; use of novel sources of RWD to inform product development, use of RWD to inform clinical development, use of advanced analytics to harness "big" RWD, and considerations when using RWD to inform internal decisions. Topics discussed will include the use of molecular, clinicogenomic, medical imaging, radiomic, and patient-derived xenograft data to augment traditional sources of RWE, the use of RWD to inform clinical trial eligibility criteria, enrich trial population based on predicted response, select endpoints, estimate sample size, understand disease progression, and enhance diversity of participants, the growing use of data tokenization and advanced analytical techniques based on artificial intelligence in RWE, as well as the importance of data quality and methodological transparency in RWE.
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Affiliation(s)
| | - Leo Russo
- Global Medical Epidemiology, Worldwide Medical and SafetyPfizer IncCollegevillePennsylvaniaUSA
| | - Ann Madsen
- Global Medical Epidemiology, Worldwide Medical and SafetyPfizer IncNew YorkNew YorkUSA
| | - Jen Webster
- Real World EvidencePfizer IncNew YorkNew YorkUSA
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23
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Seck M, Ba O, Faye BF, Touré SA, Guèye YB, Dieng N, Sall A, Gadji M, Touré AO, Diop S. Homozygous sickle cell disease related mortality in Senegal (2011–2020). EJHAEM 2021; 2:711-715. [PMID: 35845188 PMCID: PMC9176000 DOI: 10.1002/jha2.273] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/29/2021] [Revised: 07/15/2021] [Accepted: 07/19/2021] [Indexed: 11/25/2022]
Abstract
Homozygous sickle cell disease (HSCD) is characterized by multiorgan morbidity and an increased risk of early death. We aim to describe the mortality rate, causes, and risk factors of death in HSCD between 2011 and 2020. We conducted a retrospective study with a duration of 10 years in the cohort of 2348 HSCD patients. The mortality rate was determined by reporting the number of deaths to the total number of patients followed in the year. Sociodemographic, clinical, biological data and causes of death were studied. Death risk factors were determined by a bivariate analysis comparing deceased and living HSCD patients. The mean age of death was 26 years (3–52). The sex ratio was 1.2. The mortality rate was 2.76%. The death rate was high in 2011 (3.2%) and low in 2020 (0.17%). We observed a significant reduction of mortality of 94.6%. Most of the common causes of death were acute anemia (40%), acute chest syndrome (24.6%), and infections (20%). Risk factors of death were age, vaso‐occlusive crises ≥3, acute chest syndrome, blood transfusion, and chronic complications. Mortality among HSCD has significantly decreased over the past 10 years in Senegal, and the main causes of death were acute anemia, acute chest syndrome, and infections.
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Affiliation(s)
- Moussa Seck
- Hematology Department Cheikh Anta Diop University Dakar Senegal
| | - Oumou Ba
- Hematology Department Cheikh Anta Diop University Dakar Senegal
| | | | | | | | - Nata Dieng
- Hematology Department Cheikh Anta Diop University Dakar Senegal
| | - Abibatou Sall
- Hematology Department Cheikh Anta Diop University Dakar Senegal
| | - Macoura Gadji
- Hematology Department Cheikh Anta Diop University Dakar Senegal
| | - Awa Oumar Touré
- Hematology Department Cheikh Anta Diop University Dakar Senegal
| | - Saliou Diop
- Hematology Department Cheikh Anta Diop University Dakar Senegal
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24
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Ballas SK, Kuypers FA, Gordeuk VR, Hankins JS, Thompson AA, Vichinsky E. Time to rethink haemoglobin threshold guidelines in sickle cell disease. Br J Haematol 2021; 195:518-522. [PMID: 34131897 PMCID: PMC9292304 DOI: 10.1111/bjh.17578] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Accepted: 05/07/2021] [Indexed: 12/05/2022]
Abstract
Alleviating anaemia in patients with sickle cell disease (SCD) is crucial in managing acute complications, mitigating end‐organ damage and preventing early mortality. Some disease‐modifying and curative therapies have increased haemoglobin (Hb) levels to exceed 100 g/l, a threshold above which complications from red blood cell (RBC) transfusions have occurred, raising concern about whole‐blood viscosity‐related complications with these therapies. Here we discuss the rationale behind this limit, the effect of viscosity on blood flow and the applicability of this Hb threshold to therapies for SCD beyond RBC transfusions.
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Affiliation(s)
- Samir K Ballas
- Department of Medicine, Cardeza Foundation for Hematologic Research, Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA, USA
| | - Frans A Kuypers
- Children's Hospital Oakland Research Institute, Oakland, CA, USA
| | | | - Jane S Hankins
- Department of Hematology, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Alexis A Thompson
- Ann & Robert H. Lurie Children's Hospital of Chicago, Chicago, IL, USA
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25
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Bartlett R, Ramsay Z, Ali A, Grant J, Rankine-Mullings A, Gordon-Strachan G, Asnani M. Health-related quality of life and neuropathic pain in sickle cell disease in Jamaica. Disabil Health J 2021; 14:101107. [PMID: 33867318 DOI: 10.1016/j.dhjo.2021.101107] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2020] [Revised: 04/02/2021] [Accepted: 04/02/2021] [Indexed: 11/29/2022]
Abstract
BACKGROUND Health related quality of Life (HRQOL) is an important consideration when managing chronic diseases, like sickle cell disease (SCD). Assessment of neuropathic pain (NP) and its association with HRQOL in SCD are rarely reported. OBJECTIVES To examine the prevalence of NP and its association with HRQOL in adult Jamaicans with SCD. METHODS Adult SCD patients were recruited consecutively and data were collected on socio-demographics, NP using Douleur Neuropathique 4 (DN4), and HRQOL using the Adult Sickle Cell Quality of Life Measurement Information System (ASCQ-Me). Means, medians, t-tests, ANOVA tests, Wilcoxon Rank-sum tests, Kruskal-Wallis tests, Pearson's correlation and multivariate linear regression analyses were performed using STATA 14.2. RESULTS There were 236 respondents, with 56.8% female, mean age 33.2 years (SD: 11.6; range: 18-67 years), and 75% had homozygous SS genotype. NP was likely present in 26.7% of the population. The standardized ASCQ-Me (mean ± SD; ordered from lowest to best HRQOL domain scores) were: emotional impact 53.3 ± 10.1; sleep impact 56.1 ± 9.7; social function 57.7 ± 10.6; pain impact 58.6 ± 7.8; and stiffness impact 61.0 ± 7.3. On multivariate analyses, NP significantly reduced emotional and social functioning and worsened sleep and stiffness. Higher acute pain scores significantly worsened all HRQOL domains, while higher disease severity worsened all except stiffness. Obesity was associated with worse sleep and greater stiffness. Females with leg ulcers reported lower social functioning and unemployed females had greater pain impact. CONCLUSIONS NP is increasingly prevalent in SCD and worsens HRQOL. Gender specific studies are needed to understand the significantly poorer HRQOL in women.
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Affiliation(s)
- Rachel Bartlett
- Caribbean Institute for Health Research, The University of the West Indies, Mona Campus, Kingston 7, Jamaica
| | - Zachary Ramsay
- Caribbean Institute for Health Research, The University of the West Indies, Mona Campus, Kingston 7, Jamaica
| | - Amza Ali
- Avicanna Inc., 480 University Ave, Suite 1502, Toronto, ON M5G 1V2, Canada; Department of Medicine, Kingston Public Hospital, Kingston, Jamaica
| | - Justin Grant
- Avicanna Inc., 480 University Ave, Suite 1502, Toronto, ON M5G 1V2, Canada
| | - Angela Rankine-Mullings
- Caribbean Institute for Health Research, The University of the West Indies, Mona Campus, Kingston 7, Jamaica
| | - Georgiana Gordon-Strachan
- Caribbean Institute for Health Research, The University of the West Indies, Mona Campus, Kingston 7, Jamaica
| | - Monika Asnani
- Caribbean Institute for Health Research, The University of the West Indies, Mona Campus, Kingston 7, Jamaica.
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26
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Hasan MK, Aziz MH, Zarif MII, Hasan M, Hashem M, Guha S, Love RR, Ahamed S. Noninvasive Hemoglobin Level Prediction in a Mobile Phone Environment: State of the Art Review and Recommendations. JMIR Mhealth Uhealth 2021; 9:e16806. [PMID: 33830065 PMCID: PMC8063099 DOI: 10.2196/16806] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2019] [Revised: 01/20/2020] [Accepted: 02/10/2020] [Indexed: 01/23/2023] Open
Abstract
BACKGROUND There is worldwide demand for an affordable hemoglobin measurement solution, which is a particularly urgent need in developing countries. The smartphone, which is the most penetrated device in both rich and resource-constrained areas, would be a suitable choice to build this solution. Consideration of a smartphone-based hemoglobin measurement tool is compelling because of the possibilities for an affordable, portable, and reliable point-of-care tool by leveraging the camera capacity, computing power, and lighting sources of the smartphone. However, several smartphone-based hemoglobin measurement techniques have encountered significant challenges with respect to data collection methods, sensor selection, signal analysis processes, and machine-learning algorithms. Therefore, a comprehensive analysis of invasive, minimally invasive, and noninvasive methods is required to recommend a hemoglobin measurement process using a smartphone device. OBJECTIVE In this study, we analyzed existing invasive, minimally invasive, and noninvasive approaches for blood hemoglobin level measurement with the goal of recommending data collection techniques, signal extraction processes, feature calculation strategies, theoretical foundation, and machine-learning algorithms for developing a noninvasive hemoglobin level estimation point-of-care tool using a smartphone. METHODS We explored research papers related to invasive, minimally invasive, and noninvasive hemoglobin level measurement processes. We investigated the challenges and opportunities of each technique. We compared the variation in data collection sites, biosignal processing techniques, theoretical foundations, photoplethysmogram (PPG) signal and features extraction process, machine-learning algorithms, and prediction models to calculate hemoglobin levels. This analysis was then used to recommend realistic approaches to build a smartphone-based point-of-care tool for hemoglobin measurement in a noninvasive manner. RESULTS The fingertip area is one of the best data collection sites from the body, followed by the lower eye conjunctival area. Near-infrared (NIR) light-emitting diode (LED) light with wavelengths of 850 nm, 940 nm, and 1070 nm were identified as potential light sources to receive a hemoglobin response from living tissue. PPG signals from fingertip videos, captured under various light sources, can provide critical physiological clues. The features of PPG signals captured under 1070 nm and 850 nm NIR LED are considered to be the best signal combinations following a dual-wavelength theoretical foundation. For error metrics presentation, we recommend the mean absolute percentage error, mean squared error, correlation coefficient, and Bland-Altman plot. CONCLUSIONS We addressed the challenges of developing an affordable, portable, and reliable point-of-care tool for hemoglobin measurement using a smartphone. Leveraging the smartphone's camera capacity, computing power, and lighting sources, we define specific recommendations for practical point-of-care solution development. We further provide recommendations to resolve several long-standing research questions, including how to capture a signal using a smartphone camera, select the best body site for signal collection, and overcome noise issues in the smartphone-captured signal. We also describe the process of extracting a signal's features after capturing the signal based on fundamental theory. The list of machine-learning algorithms provided will be useful for processing PPG features. These recommendations should be valuable for future investigators seeking to build a reliable and affordable hemoglobin prediction model using a smartphone.
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Affiliation(s)
- Md Kamrul Hasan
- Department of Electrical Engineering and Computer Science, Vanderbilt University, Nashville, TN, United States
| | - Md Hasanul Aziz
- Department of Computer Science, Marquette University, Milwaukee, WI, United States
| | | | - Mahmudul Hasan
- Department of Computer Science, Stony Brook University, Stony Brook, NY, United States
| | - Mma Hashem
- Department of Computer Science & Engineering, Khulna University of Engineering & Technology, Khulna, Bangladesh
| | - Shion Guha
- Department of Computer Science, Marquette University, Milwaukee, WI, United States
| | - Richard R Love
- Department of Computer Science, Marquette University, Milwaukee, WI, United States
| | - Sheikh Ahamed
- Department of Computer Science, Marquette University, Milwaukee, WI, United States
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27
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Howard J, Ataga KI, Brown RC, Achebe M, Nduba V, El-Beshlawy A, Hassab H, Agodoa I, Tonda M, Gray S, Lehrer-Graiwer J, Vichinsky E. Voxelotor in adolescents and adults with sickle cell disease (HOPE): long-term follow-up results of an international, randomised, double-blind, placebo-controlled, phase 3 trial. LANCET HAEMATOLOGY 2021; 8:e323-e333. [PMID: 33838113 DOI: 10.1016/s2352-3026(21)00059-4] [Citation(s) in RCA: 49] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2021] [Revised: 02/26/2021] [Accepted: 03/01/2021] [Indexed: 01/14/2023]
Abstract
BACKGROUND For decades, patients with sickle cell disease have had only a limited number of therapies available. In 2019, voxelotor (1500 mg), an oral once-daily sickle haemoglobin polymerisation inhibitor, was approved in the USA for the treatment of sickle cell disease in patients aged 12 years and older on the basis of HOPE trial data. To further describe the applicability of voxelotor as a treatment for this chronic illness, we report the long-term efficacy and safety of this drug at 72 weeks of treatment; the conclusion of the placebo-controlled HOPE trial. METHODS HOPE is an international, randomised, double-blind, placebo-controlled, phase 3 trial done at 60 clinical sites in Canada, Egypt, France, Italy, Jamaica, Kenya, Lebanon, Netherlands, Oman, Turkey, the USA, and the UK. Patients (aged 12-65 years) with confirmed sickle cell disease, a haemoglobin concentration of 5·5-10·5 g/dL at enrolment, and who had between one and ten vaso-occlusive crisis events in the previous 12 months were enrolled. Patients receiving regularly scheduled transfusion therapy, who had received a transfusion in the previous 60 days, or who had been admitted to hospital for a vaso-occlusive crisis in the previous 14 days were excluded. Patients were randomly assigned (1:1:1) to receive either once-daily oral voxelotor 1500 mg, voxelotor 900 mg, or placebo for 72 weeks. Randomisation was done centrally by use of an interactive web response system, stratified by baseline hydroxyurea use (yes vs no), age group (adolescents [12 to <18 years] vs adults [18 to 65 years]), and geographic region (North America vs Europe vs other). The primary endpoint (already reported) was the proportion of patients who achieved a haemoglobin response at week 24. In this final analysis, we report prespecified long-term efficacy assessments by intention to treat, including changes in haemoglobin concentrations from baseline to week 72, changes in the concentration of haemolysis markers (absolute and percentage reticulocytes, indirect bilirubin concentrations, and lactate dehydrogenase concentrations) from baseline to week 72, the annualised incidence of vaso-occlusive crises, and patient functioning, as assessed with the Clinical Global Impression of Change (CGI-C) scale. Safety was assessed in patients who received at least one dose of treatment (modified intention-to-treat population). This trial is registered with ClinicalTrials.gov, NCT03036813. FINDINGS Between Dec 5, 2016, and May 3, 2018, 449 patients were screened, of whom 274 were randomly assigned to the voxelotor 1500 mg group (n=90), the voxelotor 900 mg group (n=92), or the placebo group (n=92). At week 72, the adjusted mean change in haemoglobin concentration from baseline was 1·0 g/dL (95% CI 0·7 to -1·3) in the voxelotor 1500 mg group, 0·5 g/dL (0·3 to -0·8) in the voxelotor 900 mg group, and 0·0 g/dL (-0·3 to 0·3) in the placebo group, with a significant difference observed between the voxelotor 1500 mg group and the placebo group (p<0·0001), and between the voxelotor 900 mg group and the placebo group (p=0·014). Significant improvements in markers of haemolysis, as assessed by the difference in adjusted mean percentage change from baseline at week 72 versus placebo, were observed in the voxelotor 1500 mg group in indirect bilirubin concentrations (-26·6% [95% CI -40·2 to -12·9]) and percentage of reticulocytes (-18·6% [-33·9 to -3·3]). The proportion of patients in the voxelotor 1500 mg group who were rated as "moderately improved" or "very much improved" at week 72 with the CGI-C was significantly greater than in the placebo group (39 [74%] of 53 vs 24 [47%] of 51; p=0·0057). Serious adverse events unrelated to sickle cell disease were reported in 25 (28%) of 88 patients in the voxelotor 1500 mg group, 20 (22%) of 92 patients in the voxelotor 900 mg group, and 23 (25%) of 91 patients in the placebo group. Grade 3 or 4 adverse events were infrequent (ie, occurred in <10% of patients); anaemia occurred in five or more patients (two [2%] patients in the voxelotor 1500 mg group, seven [8%] patients in the voxelotor 900 mg group, and three [3%] patients in the placebo group). Of all 274 patients, six (2%) deaths occurred during the study (two deaths in each treatment group), all of which were judged as unrelated to treatment. INTERPRETATION Voxelotor 1500 mg resulted in rapid and durable improvements in haemoglobin concentrations maintained over 72 weeks and has potential to address the substantial morbidity associated with haemolytic anaemia in sickle cell disease. FUNDING Global Blood Therapeutics.
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Affiliation(s)
- Jo Howard
- Department of Clinical Haematology, Guy's and St Thomas' NHS Foundation Trust, London, UK.
| | - Kenneth I Ataga
- University of Tennessee Health Science Center at Memphis, Memphis, TN, USA
| | - Robert C Brown
- Aflac Cancer and Blood Disorders Center of Children's Healthcare of Atlanta, and Department of Pediatrics, Emory University, Atlanta, GA, USA
| | - Maureen Achebe
- Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
| | | | - Amal El-Beshlawy
- Department of Pediatric Hematology, Cairo University, Cairo, Egypt
| | - Hoda Hassab
- Department of Pediatrics and Clinical Research Center, Faculty of Medicine, Alexandria University, Alexandria, Egypt
| | - Irene Agodoa
- Global Blood Therapeutics, South San Francisco, CA, USA
| | | | - Sarah Gray
- Global Blood Therapeutics, South San Francisco, CA, USA
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Inusa BPD, Casale M, Campbell A, Archer N. Will the changing therapeutic landscape meet the needs of patients with sickle cell disease? LANCET HAEMATOLOGY 2021; 8:e306-e307. [PMID: 33838114 DOI: 10.1016/s2352-3026(21)00098-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Accepted: 03/16/2021] [Indexed: 11/18/2022]
Affiliation(s)
- Baba Psalm Duniya Inusa
- Paediatric Haemotology, Evelina London Children's Hospital, Guy's and St Thomas' NHS Foundation Trust, London SE1 7EH, UK.
| | - Maddalena Casale
- Università degli Studi della Campania Luigi Vanvitelli, Dipartimento della Donna, del Bambino e di Chirurgia Generale e Specialistica Napoli, Naples, Italy
| | - Andrew Campbell
- Department of Hematology, Children's National Hospital, Washington, DC, USA; Children's National Hospital, George Washington University School of Medicine, Fredericksburg, VA, USA
| | - Natasha Archer
- Department of Pediatric Hematology and Oncology, Dana-Farber/Boston Children's Cancer and Blood Disorders Center, Harvard Medical School, Boston, MA, USA
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29
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Glaros AK, Razvi R, Shah N, Zaidi AU. Voxelotor: alteration of sickle cell disease pathophysiology by a first-in-class polymerization inhibitor. Ther Adv Hematol 2021; 12:20406207211001136. [PMID: 33796238 PMCID: PMC7983433 DOI: 10.1177/20406207211001136] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2021] [Accepted: 02/15/2021] [Indexed: 12/16/2022] Open
Abstract
Sickle cell disease, despite its recognition as a severely debilitating genetic condition affecting hundreds of thousands of neonates throughout the world each year, was not a target of pharmaceutical research focus for most of its 100-year existence in the medical consciousness. This has changed in recent years as many novel therapeutics are currently under investigation, with three new disease-modifying drugs achieving FDA approval in the last 4 years. One of these drugs, voxelotor, is especially encouraging as an inhibitor of sickling for its ability to safely improve the chronic hemolytic anemia of sickle cell disease. This was demonstrated during all clinical phases of investigation by an average improvement in hemoglobin of greater than 1 g/dL, as well as statistically significant improvements in established markers of hemolysis. While anemia itself represents a potential cause of morbidity, it is more importantly a marker of the hemolysis known to cause the long-term vascular and organ damage that makes sickle cell disease so debilitating and frequently fatal early in life. Given the recency of the approval, there has not been sufficient long-term follow-up to demonstrate improvement in the chronic sequelae of sickle cell disease as a result of voxelotor-induced improvements in hemolytic anemia. There is hope, however, based on the experience with hydroxyurea improving morbidity and mortality via reductions in sickling and improved rheology, that voxelotor may have similar long-term benefits by positively manipulating the kinetics of hemoglobin polymerization. This review aims to summarize the targeted pathobiology of sickle cell disease, the mechanism of action of voxelotor, and the safety and efficacy data from preclinical to late clinical stage investigations of this long-awaited medication, in the hopes of better informing the decision-making process behind prescribing or not prescribing it for patients in need of intervention.
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Affiliation(s)
- Alexander K. Glaros
- Central Michigan University, Mt. Pleasant, MI, USA
- Children’s Hospital of Michigan, Detroit, MI, USA
| | - Reza Razvi
- Children’s Hospital of Michigan, Detroit, MI, USA
| | | | - Ahmar U. Zaidi
- Central Michigan University, Mt. Pleasant, MI, USA
- Children’s Hospital of Michigan, Detroit, MI, USA
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30
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Abstract
Introduction: The clinical manifestations of sickle cell disease (SCD) result from an inherited mutation in the beta-globin chain of hemoglobin (Hb) that causes Hb tetramers to polymerize when deoxygenated. The resulting erythrocyte deformation causes mechanical obstruction of blood flow by sickled cells, hemolysis, anemia and end-organ injury. While pain is the hallmark symptom of SCD, chronic organ injury as a result of anemia, inflammation and progressive vasculopathy play a major role in morbidity and mortality. Due to the complex pathophysiology of SCD, the need for an individualized, multi-modal pharmacologic approach is apparent. Until 2018, hydroxyurea was the only disease-modifying pharmacologic therapy approved for use in SCD. Since then, three new agents have been approved including voxelotor, the subject of this review.Areas covered: Published pre-clinical and clinical data are reviewed. Voxelotor is a first-in-class small-molecule agent that binds to Hb and increases oxygen affinity, preventing polymerization. Recent clinical trials have shown that it increases Hb concentration and reduces hemolysis in patients with SCD. This increase in Hb concentration may significantly impact morbidity and mortality from chronic organ injury.Expert opinion: The mechanism of action, published studies and current opinions on the clinical use of voxelotor in SCD are presented.
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Affiliation(s)
- Madhav Vissa
- Department of Pediatric Hematology/Oncology, UCSF Benioff Children's Hospital Oakland, Oakland, CA, USA
| | - Elliott Vichinsky
- Department of Pediatric Hematology/Oncology, UCSF Benioff Children's Hospital Oakland, Oakland, CA, USA
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31
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Accelerated approval of Oxbryta® (voxelotor): A case study on novel endpoint selection in sickle cell disease. Contemp Clin Trials 2020; 98:106161. [PMID: 33010428 DOI: 10.1016/j.cct.2020.106161] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2020] [Revised: 09/25/2020] [Accepted: 09/27/2020] [Indexed: 12/14/2022]
Abstract
Sickle cell disease (SCD) is an inherited disease characterized by hemolysis, anemia, and vaso-occlusion leading to substantial morbidity and mortality. Development of prior pharmacologic therapies exclusively utilized vaso-occlusive crisis (VOC) as a clinical efficacy endpoint; however, this focus on VOC did not capture the full extent of disease symptomatology and complications and slowed the development of new therapies. Voxelotor, a hemoglobin S polymerization inhibitor, was recently approved in the United States for the treatment of SCD in adults and adolescents 12 years of age and older through an accelerated approval pathway. The rapid approval and availability of voxelotor was facilitated in a collaborative effort with the US Food and Drug Administration (FDA), using hemoglobin, a biologic surrogate endpoint, as reasonably likely to predict clinical benefit. Use of this new endpoint was supported by FDA-led multistakeholder discussions with physician and patient communities to identify unmet needs and potential clinical trial endpoints, as well as by a company-sponsored analysis of external patient-level data to demonstrate a correlation between hemoglobin change and stroke risk. A two-part phase 3 study was used to allow for rank ordering of key secondary endpoints based on a planned interim analysis. Continued open communication with the FDA was essential to gain agreement on hemoglobin as a novel endpoint and to address the unmet and urgent need of new therapies for SCD.
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