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Brito M, Rufatto R, Brito-Sousa JD, Murta F, Sampaio V, Balieiro P, Baía-Silva D, Castro V, Alves B, Alencar A, Duparc S, Grewal Daumerie P, Borghini-Fuhrer I, Jambert E, Peterka C, Edilson Lima F, Carvalho Maia L, Lucena Cruz C, Maciele B, Vasconcelos M, Machado M, Augusto Figueira E, Alcirley Balieiro A, Batista Pereira D, Lacerda M. Operational effectiveness of tafenoquine and primaquine for the prevention of Plasmodium vivax recurrence in Brazil: a retrospective observational study. THE LANCET. INFECTIOUS DISEASES 2024; 24:629-638. [PMID: 38452779 PMCID: PMC7615970 DOI: 10.1016/s1473-3099(24)00074-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2023] [Revised: 01/15/2024] [Accepted: 01/25/2024] [Indexed: 03/09/2024]
Abstract
BACKGROUND Prevention of Plasmodium vivax malaria recurrence is essential for malaria elimination in Brazil. We evaluated the real-world effectiveness of an updated treatment algorithm for P vivax radical cure in the Brazilian Amazon. METHODS In this non-interventional observational study, we used retrospective data from the implementation of a P vivax treatment algorithm at 43 health facilities in Manaus and Porto Velho, Brazil. The treatment algorithm consisted of chloroquine (25 mg/kg over 3 days) and point-of-care quantitative glucose-6-phosphate dehydrogenase (G6PD) testing followed by single-dose tafenoquine 300 mg (G6PD normal, aged ≥16 years, not pregnant and not breastfeeding), 7-day primaquine 0·5 mg/kg per day (G6PD intermediate or normal, aged ≥6 months, not pregnant, and not breastfeeding or breastfeeding for >1 month), or primaquine 0·75 mg/kg per week for 8 weeks (G6PD deficient, aged ≥6 months, not pregnant, and not breastfeeding or breastfeeding for >1 month). P vivax recurrences were identified from probabilistic linkage of routine patient records from the Brazilian malaria epidemiological surveillance system. Recurrence-free effectiveness at day 90 and day 180 was estimated using Kaplan-Meier analysis and hazard ratios (HRs) by multivariate analysis. This clinical trial is registered with ClinicalTrials.gov, NCT05096702, and is completed. FINDINGS Records from Sept 9, 2021, to Aug 31, 2022, included 5554 patients with P vivax malaria. In all treated patients of any age and any G6PD status, recurrence-free effectiveness at day 180 was 75·8% (95% CI 74·0-77·6) with tafenoquine, 73·4% (71·9-75·0) with 7-day primaquine, and 82·1% (77·7-86·8) with weekly primaquine. In patients aged at least 16 years who were G6PD normal, recurrence-free effectiveness until day 90 was 88·6% (95% CI 87·2-89·9) in those who were treated with tafenoquine (n=2134) and 83·5% (79·8-87·4) in those treated with 7-day primaquine (n=370); after adjustment for confounding factors, the HR for recurrence following tafenoquine versus 7-day primaquine was 0·65 (95% CI 0·49-0·86; p=0·0031), with similar outcomes between the two treatments at day 180 (log-rank p=0·82). Over 180 days, median time to recurrence in patients aged at least 16 years who were G6PD normal was 92 days (IQR 76-120) in those treated with tafenoquine and 68 days (52-94) in those treated with 7-day primaquine. INTERPRETATION In this real-world setting, single-dose tafenoquine was more effective at preventing P vivax recurrence in patients aged at least 16 years who were G6PD normal compared with 7-day primaquine at day 90, while overall efficacy at 180 days was similar. The public health benefits of the P vivax radical cure treatment algorithm incorporating G6PD quantitative testing and tafenoquine support its implementation in Brazil and potentially across South America. FUNDING Brazilian Ministry of Health, Municipal and State Health Secretariats; Fiocruz; Medicines for Malaria Venture; Bill & Melinda Gates Foundation; Newcrest Mining; and the UK Government. TRANSLATION For the Portuguese translation of the abstract see Supplementary Materials section.
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Affiliation(s)
- Marcelo Brito
- Fundação de Medicina Tropical Doutor Heitor Vieira Dourado, Manaus, Brazil
| | - Rosilene Rufatto
- Centro de Pesquisa em Medicina Tropical de Rondônia, Porto Velho, Brazil
| | | | - Felipe Murta
- Fundação de Medicina Tropical Doutor Heitor Vieira Dourado, Manaus, Brazil
| | - Vanderson Sampaio
- Fundação de Medicina Tropical Doutor Heitor Vieira Dourado, Manaus, Brazil
| | - Patrícia Balieiro
- Fundação de Medicina Tropical Doutor Heitor Vieira Dourado, Manaus, Brazil
| | - Djane Baía-Silva
- Fundação de Medicina Tropical Doutor Heitor Vieira Dourado, Manaus, Brazil
| | | | - Brenda Alves
- Fundação de Medicina Tropical Doutor Heitor Vieira Dourado, Manaus, Brazil
| | - Aline Alencar
- Fundação de Medicina Tropical Doutor Heitor Vieira Dourado, Manaus, Brazil
| | | | | | | | | | | | | | | | | | - Bruna Maciele
- Centro de Pesquisa em Medicina Tropical de Rondônia, Porto Velho, Brazil
| | | | | | | | | | | | - Marcus Lacerda
- Fundação de Medicina Tropical Doutor Heitor Vieira Dourado, Manaus, Brazil; Instituto Leônidas & Maria Deane, Fiocruz, Manaus, Brazil; University of Texas Medical Branch, Galveston, TX, USA.
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Santos A, Brito M, Silva E, Rocha F, Oliveira A, Dávila R, Gama H, Albuquerque J, Paiva M, Baía-Silva D, Sampaio V, Balieiro P, Rufatto R, Grewal Daumerie P, Peterka C, Edilson Lima F, Monteiro W, Arcanjo A, Silva R, Batista Pereira D, Lacerda M, Murta F. Perspectives of healthcare professionals on training for quantitative G6PD testing during implementation of tafenoquine in Brazil (QualiTRuST Study). PLoS Negl Trop Dis 2024; 18:e0012197. [PMID: 38837977 PMCID: PMC11152287 DOI: 10.1371/journal.pntd.0012197] [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: 11/20/2023] [Accepted: 05/06/2024] [Indexed: 06/07/2024] Open
Abstract
Effective radical cure of Plasmodium vivax malaria is essential for malaria elimination in Brazil. P. vivax radical cure requires administration of a schizonticide, such as chloroquine, plus an 8-aminoquinoline. However, 8-aminoquinolines cause hemolysis in individuals with glucose-6-phosphate dehydrogenase (G6PD) deficiency, requiring prior screening to exclude those at risk. Brazil is pioneering the implementation of tafenoquine, a single-dose 8-aminoquinoline indicated for P. vivax patients with >70% of normal G6PD activity. Tafenoquine implementation in Manaus and Porto Velho, two municipalities located in the western Brazilian Amazon, included comprehensive training of healthcare professionals (HCPs) on point-of-care quantitative G6PD testing and a new treatment algorithm for P. vivax radical cure incorporating tafenoquine. Training was initially provided to higher-level facilities (phase one) and later adapted for primary care units (phase two). This study analyzed HCP experiences during training and implementation and identified barriers and facilitators. In-depth interviews and focus discussion groups were conducted 30 days after each training for a purposive random sample of 115 HCPs. Thematic analysis was employed using MAXQDA software, analyzing data through inductive and deductive coding. Analysis showed that following the initial training for higher-level facilities, some HCPs did not feel confident performing quantitative G6PD testing and prescribing the tafenoquine regimen. Modifications to the training in phase two resulted in an improvement in understanding the implementation process of the G6PD test and tafenoquine, as well as in the knowledge acquired by HCPs. Additionally, knowledge gaps were addressed through in situ training, peer communication via a messaging app, and educational materials. Training supported effective deployment of the new tools in Manaus and Porto Velho and increased awareness of the need for pharmacovigilance. A training approach for nationwide implementation of these tools was devised. Implementing quantitative G6PD testing and tafenoquine represents a significant shift in P. vivax malaria case management. Consistent engagement with HCPs is needed to overcome challenges in fully integrating these tools within the Brazilian health system.
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Affiliation(s)
- Alicia Santos
- Fundação de Medicina Tropical Dr Heitor Vieira Dourado, Manaus, Brazil
- Universidade do Estado do Amazonas, Manaus, Brazil
| | - Marcelo Brito
- Fundação de Medicina Tropical Dr Heitor Vieira Dourado, Manaus, Brazil
| | - Evellyn Silva
- Fundação de Medicina Tropical Dr Heitor Vieira Dourado, Manaus, Brazil
- Universidade do Estado do Amazonas, Manaus, Brazil
| | - Felipe Rocha
- Fundação de Medicina Tropical Dr Heitor Vieira Dourado, Manaus, Brazil
| | - Ana Oliveira
- Fundação de Medicina Tropical Dr Heitor Vieira Dourado, Manaus, Brazil
| | - Rafaela Dávila
- Fundação de Medicina Tropical Dr Heitor Vieira Dourado, Manaus, Brazil
- Universidade do Estado do Amazonas, Manaus, Brazil
| | - Hiran Gama
- Fundação de Medicina Tropical Dr Heitor Vieira Dourado, Manaus, Brazil
- Universidade do Estado do Amazonas, Manaus, Brazil
| | | | - Mena Paiva
- Fundação de Medicina Tropical Dr Heitor Vieira Dourado, Manaus, Brazil
- Universidade do Estado do Amazonas, Manaus, Brazil
| | - Djane Baía-Silva
- Fundação de Medicina Tropical Dr Heitor Vieira Dourado, Manaus, Brazil
- Universidade do Estado do Amazonas, Manaus, Brazil
| | - Vanderson Sampaio
- Fundação de Medicina Tropical Dr Heitor Vieira Dourado, Manaus, Brazil
- Universidade do Estado do Amazonas, Manaus, Brazil
| | - Patrícia Balieiro
- Fundação de Medicina Tropical Dr Heitor Vieira Dourado, Manaus, Brazil
- Universidade do Estado do Amazonas, Manaus, Brazil
| | - Rosilene Rufatto
- Centro de Pesquisa em Medicina Tropical de Rondônia (CEPEM), Porto Velho, Brazil
| | | | | | | | - Wuelton Monteiro
- Fundação de Medicina Tropical Dr Heitor Vieira Dourado, Manaus, Brazil
- Universidade do Estado do Amazonas, Manaus, Brazil
| | - Ana Arcanjo
- Fundação de Vigilância em Saúde, Manaus, Brazil
| | | | | | - Marcus Lacerda
- Fundação de Medicina Tropical Dr Heitor Vieira Dourado, Manaus, Brazil
- Universidade do Estado do Amazonas, Manaus, Brazil
- Instituto Leônidas & Maria Deane, Fiocruz, Manaus, Brazil
- University of Texas Medical Branch, Galveston, Texas, United States of America
| | - Felipe Murta
- Fundação de Medicina Tropical Dr Heitor Vieira Dourado, Manaus, Brazil
- Universidade do Estado do Amazonas, Manaus, Brazil
- Instituto Leônidas & Maria Deane, Fiocruz, Manaus, Brazil
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Sharma R, Sharma H, Jones S, Borghini-Fuhrer I, Domingo GJ, Gibson RA, Rolfe K, Tan L, Fiţa IG, Chen C, Bird P, Pingle A, Duparc S. Optimal balance of benefit versus risk for tafenoquine in the treatment of Plasmodium vivax malaria. Malar J 2024; 23:145. [PMID: 38741094 DOI: 10.1186/s12936-024-04924-z] [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: 08/31/2023] [Accepted: 03/29/2024] [Indexed: 05/16/2024] Open
Abstract
A single 300 mg dose of tafenoquine (an 8-aminoquinoline), in combination with a standard 3-day course of chloroquine, is approved in several countries for the radical cure (prevention of relapse) of Plasmodium vivax malaria in patients aged ≥ 16 years. Despite this, questions have arisen on the optimal dose of tafenoquine. Before the availability of tafenoquine, a 3-day course of chloroquine in combination with the 8-aminoquinoline primaquine was the only effective radical cure for vivax malaria. The World Health Organization (WHO)-recommended standard regimen is 14 days of primaquine 0.25 mg/kg/day or 7 days of primaquine 0.5 mg/kg/day in most regions, or 14 days of primaquine 0.5 mg/kg/day in East Asia and Oceania, however the long treatment courses of 7 or 14 days may result in poor adherence and, therefore, low treatment efficacy. A single dose of tafenoquine 300 mg in combination with a 3-day course of chloroquine is an important advancement for the radical cure of vivax malaria in patients without glucose-6-phosphate dehydrogenase (G6PD) deficiency, as the use of a single-dose treatment will improve adherence. Selection of a single 300 mg dose of tafenoquine for the radical cure of P. vivax malaria was based on collective efficacy and safety data from 33 studies involving more than 4000 trial participants who received tafenoquine, including over 800 subjects who received the 300 mg single dose. The safety profile of single-dose tafenoquine 300 mg is similar to that of standard-dosage primaquine 0.25 mg/kg/day for 14 days. Both primaquine and tafenoquine can cause acute haemolytic anaemia in individuals with G6PD deficiency; severe haemolysis can lead to anaemia, kidney damage, and, in some cases, death. Therefore, relapse prevention using an 8-aminoquinoline must be balanced with the need to avoid clinical haemolysis associated with G6PD deficiency. To minimize this risk, the WHO recommends G6PD testing for all individuals before the administration of curative doses of 8-aminoquinolines. In this article, the authors review key efficacy and safety data from the pivotal trials of tafenoquine and argue that the currently approved dose represents a favourable benefit-risk profile.
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Affiliation(s)
- Raman Sharma
- Global Health Medicines R&D, GSK Medicines Research Centre, Gunnels Wood Road, Stevenage, Hertfordshire, SG1 2NY, UK
| | | | | | | | | | - Rachel A Gibson
- Global Health Medicines R&D, GSK Medicines Research Centre, Gunnels Wood Road, Stevenage, Hertfordshire, SG1 2NY, UK.
| | - Katie Rolfe
- Global Health Medicines R&D, GSK Medicines Research Centre, Gunnels Wood Road, Stevenage, Hertfordshire, SG1 2NY, UK
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Pottenger AE, Roy D, Srinivasan S, Chavas TEJ, Vlaskin V, Ho DK, Livingston VC, Maktabi M, Lin H, Zhang J, Pybus B, Kudyba K, Roth A, Senter P, Tyson G, Huber HE, Wesche D, Rochford R, Burke PA, Stayton PS. Liver-targeted polymeric prodrugs delivered subcutaneously improve tafenoquine therapeutic window for malaria radical cure. SCIENCE ADVANCES 2024; 10:eadk4492. [PMID: 38640243 PMCID: PMC11029812 DOI: 10.1126/sciadv.adk4492] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Accepted: 03/19/2024] [Indexed: 04/21/2024]
Abstract
Approximately 3.3 billion people live with the threat of Plasmodium vivax malaria. Infection can result in liver-localized hypnozoites, which when reactivated cause relapsing malaria. This work demonstrates that an enzyme-cleavable polymeric prodrug of tafenoquine addresses key requirements for a mass administration, eradication campaign: excellent subcutaneous bioavailability, complete parasite control after a single dose, improved therapeutic window compared to the parent oral drug, and low cost of goods sold (COGS) at less than $1.50 per dose. Liver targeting and subcutaneous dosing resulted in improved liver:plasma exposure profiles, with increased efficacy and reduced glucose 6-phosphate dehydrogenase-dependent hemotoxicity in validated preclinical models. A COGS and manufacturability analysis demonstrated global scalability, affordability, and the ability to redesign this fully synthetic polymeric prodrug specifically to increase global equity and access. Together, this polymer prodrug platform is a candidate for evaluation in human patients and shows potential for P. vivax eradication campaigns.
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Affiliation(s)
- Ayumi E. Pottenger
- Department of Bioengineering, University of Washington, Seattle, WA 98195, USA
| | - Debashish Roy
- Department of Bioengineering, University of Washington, Seattle, WA 98195, USA
| | - Selvi Srinivasan
- Department of Bioengineering, University of Washington, Seattle, WA 98195, USA
| | - Thomas E. J. Chavas
- Department of Bioengineering, University of Washington, Seattle, WA 98195, USA
| | - Vladmir Vlaskin
- Department of Bioengineering, University of Washington, Seattle, WA 98195, USA
| | - Duy-Khiet Ho
- Department of Bioengineering, University of Washington, Seattle, WA 98195, USA
| | | | - Mahdi Maktabi
- Department of Immunology and Microbiology, University of Colorado Anschutz School of Medicine, Aurora, CO 80045, USA
| | - Hsiuling Lin
- Department of Drug Discovery, Experimental Therapeutics Branch, Walter Reed Army Institute of Research, Silver Spring, MD 20910, USA
| | - Jing Zhang
- Department of Drug Discovery, Experimental Therapeutics Branch, Walter Reed Army Institute of Research, Silver Spring, MD 20910, USA
| | - Brandon Pybus
- Department of Drug Discovery, Experimental Therapeutics Branch, Walter Reed Army Institute of Research, Silver Spring, MD 20910, USA
| | - Karl Kudyba
- Department of Drug Discovery, Experimental Therapeutics Branch, Walter Reed Army Institute of Research, Silver Spring, MD 20910, USA
| | - Alison Roth
- Department of Drug Discovery, Experimental Therapeutics Branch, Walter Reed Army Institute of Research, Silver Spring, MD 20910, USA
| | | | - George Tyson
- George Tyson Consulting, Los Altos Hills, CA 94022, USA
- Department of Chemical and Biomolecular Engineering, University of California, Berkeley, Berkeley, CA 94720, USA
| | - Hans E. Huber
- BioTD Strategies LLC, 213 Abbey Ln., Lansdale, PA 19446, USA
| | | | - Rosemary Rochford
- Department of Immunology and Microbiology, University of Colorado Anschutz School of Medicine, Aurora, CO 80045, USA
| | - Paul A. Burke
- Department of Bioengineering, University of Washington, Seattle, WA 98195, USA
- Burke Bioventures LLC, 1 Broadway 14th Floor, Cambridge, MA 02142, USA
| | - Patrick S. Stayton
- Department of Bioengineering, University of Washington, Seattle, WA 98195, USA
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Yongvanitchit K, Kum-Arb U, Limsalakpetch A, Im-Erbsin R, Ubalee R, Spring MD, Vesely BA, Waters N, Pichyangkul S. Superior protection in a relapsing Plasmodium cynomolgi rhesus macaque model by a chemoprophylaxis with sporozoite immunization regimen with atovaquone-proguanil followed by primaquine. Malar J 2024; 23:106. [PMID: 38632607 PMCID: PMC11022453 DOI: 10.1186/s12936-024-04933-y] [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: 12/07/2023] [Accepted: 04/04/2024] [Indexed: 04/19/2024] Open
Abstract
BACKGROUND To gain a deeper understanding of protective immunity against relapsing malaria, this study examined sporozoite-specific T cell responses induced by a chemoprophylaxis with sporozoite (CPS) immunization in a relapsing Plasmodium cynomolgi rhesus macaque model. METHODS The animals received three CPS immunizations with P. cynomolgi sporozoites, administered by mosquito bite, while under two anti-malarial drug regimens. Group 1 (n = 6) received artesunate/chloroquine (AS/CQ) followed by a radical cure with CQ plus primaquine (PQ). Group 2 (n = 6) received atovaquone-proguanil (AP) followed by PQ. After the final immunization, the animals were challenged with intravenous injection of 104 P. cynomolgi sporozoites, the dose that induced reliable infection and relapse rate. These animals, along with control animals (n = 6), were monitored for primary infection and subsequent relapses. Immunogenicity blood draws were done after each of the three CPS session, before and after the challenge, with liver, spleen and bone marrow sampling and analysis done after the challenge. RESULTS Group 2 animals demonstrated superior protection, with two achieving protection and two experiencing partial protection, while only one animal in group 1 had partial protection. These animals displayed high sporozoite-specific IFN-γ T cell responses in the liver, spleen, and bone marrow after the challenge with one protected animal having the highest frequency of IFN-γ+ CD8+, IFN-γ+ CD4+, and IFN-γ+ γδ T cells in the liver. Partially protected animals also demonstrated a relatively high frequency of IFN-γ+ CD8+, IFN-γ+ CD4+, and IFN-γ+ γδ T cells in the liver. It is important to highlight that the second animal in group 2, which experienced protection, exhibited deficient sporozoite-specific T cell responses in the liver while displaying average to high T cell responses in the spleen and bone marrow. CONCLUSIONS This research supports the notion that local liver T cell immunity plays a crucial role in defending against liver-stage infection. Nevertheless, there is an instance where protection occurs independently of T cell responses in the liver, suggesting the involvement of the liver's innate immunity. The relapsing P. cynomolgi rhesus macaque model holds promise for informing the development of vaccines against relapsing P. vivax.
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Affiliation(s)
- Kosol Yongvanitchit
- Armed Forces Research Institute of Medical Sciences (AFRIMS), Bangkok, Thailand
| | - Utaiwan Kum-Arb
- Armed Forces Research Institute of Medical Sciences (AFRIMS), Bangkok, Thailand
| | | | - Rawiwan Im-Erbsin
- Armed Forces Research Institute of Medical Sciences (AFRIMS), Bangkok, Thailand
| | - Ratawan Ubalee
- Armed Forces Research Institute of Medical Sciences (AFRIMS), Bangkok, Thailand
| | - Michele D Spring
- Armed Forces Research Institute of Medical Sciences (AFRIMS), Bangkok, Thailand
| | - Brian A Vesely
- Armed Forces Research Institute of Medical Sciences (AFRIMS), Bangkok, Thailand
| | - Norman Waters
- Armed Forces Research Institute of Medical Sciences (AFRIMS), Bangkok, Thailand
| | - Sathit Pichyangkul
- Armed Forces Research Institute of Medical Sciences (AFRIMS), Bangkok, Thailand.
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Brito M, Rufatto R, Murta F, Sampaio V, Balieiro P, Baía-Silva D, Castro V, Alves B, Alencar A, Duparc S, Grewal Daumerie P, Borghini-Fuhrer I, Jambert E, Peterka C, Edilson Lima F, Carvalho Maia L, Lucena Cruz C, Maciele B, Vasconcelos M, Machado M, Augusto Figueira E, Alcirley Balieiro A, Menezes A, Ataídes R, Batista Pereira D, Lacerda M. Operational feasibility of Plasmodium vivax radical cure with tafenoquine or primaquine following point-of-care, quantitative glucose-6-phosphate dehydrogenase testing in the Brazilian Amazon: a real-life retrospective analysis. Lancet Glob Health 2024; 12:e467-e477. [PMID: 38365417 PMCID: PMC10882209 DOI: 10.1016/s2214-109x(23)00542-9] [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: 07/25/2023] [Revised: 11/07/2023] [Accepted: 11/10/2023] [Indexed: 02/18/2024]
Abstract
BACKGROUND To achieve malaria elimination, Brazil must implement Plasmodium vivax radical cure. We aimed to investigate the operational feasibility of point-of-care, quantitative, glucose-6-phosphate dehydrogenase (G6PD) testing followed by chloroquine plus tafenoquine or primaquine. METHODS This non-interventional, observational study was done at 43 health facilities in Manaus (Amazonas State) and Porto Velho (Rondônia State), Brazil, implementing a new P vivax treatment algorithm incorporating point-of-care quantitative G6PD testing to identify G6PD status and single-dose tafenoquine (G6PD normal, aged ≥16 years, and not pregnant or breastfeeding) or primaquine (intermediate or normal G6PD, aged ≥6 months, not pregnant, or breastfeeding >1 month). Following training of health-care providers, we collated routine patient records from the malaria epidemiological surveillance system (SIVEP-Malaria) retrospectively for all consenting patients aged at least 6 months with parasitologically confirmed P vivax malaria mono-infection or P vivax plus P falciparum mixed infection, presenting between Sept 9, 2021, and Aug 31, 2022. The primary endpoint was the proportion of patients aged at least 16 years with P vivax mono-infection treated or not treated appropriately with tafenoquine in accordance with their G6PD status. The trial is registered with ClinicalTrials.gov, NCT05096702, and is completed. FINDINGS Of 6075 patients enrolled, 6026 (99·2%) had P vivax mono-infection, 2685 (44·6%) of whom were administered tafenoquine. G6PD status was identified in 2685 (100%) of 2685 patients treated with tafenoquine. The proportion of patients aged at least 16 years with P vivax mono-infection who were treated or not treated appropriately with tafenoquine in accordance with their G6PD status was 99·7% (95% CI 99·4-99·8; 4664/4680). INTERPRETATION Quantitative G6PD testing before tafenoquine administration was operationally feasible, with high adherence to the treatment algorithm, supporting deployment throughout the Brazilian health system. FUNDING Brazilian Ministry of Health, Municipal and State Health Secretariats; Fiocruz; Medicines for Malaria Venture; Bill & Melinda Gates Foundation; Newcrest Mining; and the UK Government. TRANSLATION For the Portuguese translation of the abstract see Supplementary Materials section.
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Affiliation(s)
- Marcelo Brito
- Fundação de Medicina Tropical Doutor Heitor Vieira Dourado, Manaus, Brazil
| | - Rosilene Rufatto
- Centro de Pesquisa em Medicina Tropical de Rondônia, Porto Velho, Brazil
| | - Felipe Murta
- Fundação de Medicina Tropical Doutor Heitor Vieira Dourado, Manaus, Brazil
| | - Vanderson Sampaio
- Fundação de Medicina Tropical Doutor Heitor Vieira Dourado, Manaus, Brazil
| | - Patrícia Balieiro
- Fundação de Medicina Tropical Doutor Heitor Vieira Dourado, Manaus, Brazil
| | - Djane Baía-Silva
- Fundação de Medicina Tropical Doutor Heitor Vieira Dourado, Manaus, Brazil; Universidade do Estado do Amazonas, Manaus, Brazil; Instituto Leônidas & Maria Deane, Fiocruz, Manaus, Brazil; Universidade Nilton Lins, Manaus, Brazil
| | | | - Brenda Alves
- Fundação de Medicina Tropical Doutor Heitor Vieira Dourado, Manaus, Brazil
| | - Aline Alencar
- Fundação de Medicina Tropical Doutor Heitor Vieira Dourado, Manaus, Brazil
| | | | | | | | | | | | | | | | | | - Bruna Maciele
- Centro de Pesquisa em Medicina Tropical de Rondônia, Porto Velho, Brazil
| | | | | | | | | | | | | | | | - Marcus Lacerda
- Fundação de Medicina Tropical Doutor Heitor Vieira Dourado, Manaus, Brazil; Instituto Leônidas & Maria Deane, Fiocruz, Manaus, Brazil; University of Texas Medical Branch, Galveston, TX, USA.
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Sharma R, Chen C, Tan L, Rolfe K, Fiţa IG, Jones S, Pingle A, Gibson RA, Goyal N, Sharma H, Bird P. Comment on 'The clinical pharmacology of tafenoquine in the radical cure of Plasmodium vivax malaria: An individual patient data meta-analysis'. eLife 2024; 13:e89263. [PMID: 38323802 PMCID: PMC10849672 DOI: 10.7554/elife.89263] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2023] [Accepted: 01/11/2024] [Indexed: 02/08/2024] Open
Abstract
A single 300 mg dose of tafenoquine, in combination with chloroquine, is currently approved in several countries for the radical cure (prevention of relapse) of Plasmodium vivax malaria in patients aged ≥16 years. Recently, however, Watson et al. suggested that the approved dose of tafenoquine is insufficient for radical cure, and that a higher 450 mg dose could reduce P. vivax recurrences substantially (Watson et al., 2022). In this response, we challenge Watson et al.'s assertion based on empirical evidence from dose-ranging and pivotal studies (published) as well as real-world evidence from post-approval studies (ongoing, therefore currently unpublished). We assert that, collectively, these data confirm that the benefit-risk profile of a single 300 mg dose of tafenoquine, co-administered with chloroquine, for the radical cure of P. vivax malaria in patients who are not G6PD-deficient, continues to be favourable where chloroquine is indicated for P. vivax malaria. If real-world evidence of sub-optimal efficacy in certain regions is observed or dose-optimisation with other blood-stage therapies is required, then well-designed clinical studies assessing safety and efficacy will be required before higher doses are approved for clinical use.
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Watson JA, Commons RJ, Tarning J, Simpson JA, Llanos Cuentas A, Lacerda MVG, Green JA, Koh GCKW, Chu CS, Nosten FH, Price RN, Day NPJ, White NJ. Response to comment on 'The clinical pharmacology of tafenoquine in the radical cure of Plasmodium vivax malaria: An individual patient data meta-analysis'. eLife 2024; 13:e91283. [PMID: 38323801 PMCID: PMC10849674 DOI: 10.7554/elife.91283] [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: 08/14/2023] [Accepted: 01/08/2024] [Indexed: 02/08/2024] Open
Abstract
In our recent paper on the clinical pharmacology of tafenoquine (Watson et al., 2022), we used all available individual patient pharmacometric data from the tafenoquine pre-registration clinical efficacy trials to characterise the determinants of anti-relapse efficacy in tropical vivax malaria. We concluded that the currently recommended dose of tafenoquine (300 mg in adults, average dose of 5 mg/kg) is insufficient for cure in all adults, and a 50% increase to 450 mg (7.5 mg/kg) would halve the risk of vivax recurrence by four months. We recommended that clinical trials of higher doses should be carried out to assess their safety and tolerability. Sharma and colleagues at the pharmaceutical company GSK defend the currently recommended adult dose of 300 mg as the optimum balance between radical curative efficacy and haemolytic toxicity (Sharma et al., 2024). We contend that the relative haemolytic risks of the 300 mg and 450 mg doses have not been sufficiently well characterised to justify this opinion. In contrast, we provided evidence that the currently recommended 300 mg dose results in sub-maximal efficacy, and that prospective clinical trials of higher doses are warranted to assess their risks and benefits.
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Affiliation(s)
- James A Watson
- Oxford University Clinical Research Unit, Hospital for Tropical DiseasesHo Chi MinhViet Nam
- Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of OxfordOxfordUnited Kingdom
- WorldWide Antimalarial Resistance NetworkOxfordUnited Kingdom
| | - Robert J Commons
- WorldWide Antimalarial Resistance NetworkOxfordUnited Kingdom
- Global Health Division, Menzies School of Health Research, Charles Darwin UniversityDarwinAustralia
| | - Joel Tarning
- Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of OxfordOxfordUnited Kingdom
- Mahidol Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol UniversityBangkokThailand
| | - Julie A Simpson
- Centre for Epidemiology and Biostatistics, Melbourne School of Population and Global Health, University of MelbourneMelbourneAustralia
| | - Alejandro Llanos Cuentas
- Unit of Leishmaniasis and Malaria, Instituto de Medicina Tropical “Alexander von Humboldt”, Universidad Peruana Cayetano HerediaSan Martín de PorresPeru
| | | | | | - Gavin CKW Koh
- Department of Infectious Diseases, Northwick Park HospitalHarrowUnited Kingdom
| | - Cindy S Chu
- Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of OxfordOxfordUnited Kingdom
- Shoklo Malaria Research UnitMae SotThailand
| | - François H Nosten
- Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of OxfordOxfordUnited Kingdom
- Shoklo Malaria Research UnitMae SotThailand
| | - Richard N Price
- Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of OxfordOxfordUnited Kingdom
- WorldWide Antimalarial Resistance NetworkOxfordUnited Kingdom
- Global Health Division, Menzies School of Health Research, Charles Darwin UniversityDarwinAustralia
| | - Nicholas PJ Day
- Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of OxfordOxfordUnited Kingdom
- Mahidol Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol UniversityBangkokThailand
| | - Nicholas J White
- Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of OxfordOxfordUnited Kingdom
- Mahidol Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol UniversityBangkokThailand
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Bancone G, Poe DD, Gornsawun G, Htway PP, Gilder ME, Archasuksan L, Chotivanich K, McGready R, Nosten F. Reference spectrophotometric values for glucose-6-phosphate dehydrogenase activity in two-to six-month-old infants on the Thailand-Myanmar border. Wellcome Open Res 2024; 7:273. [PMID: 38406309 PMCID: PMC10884598 DOI: 10.12688/wellcomeopenres.18417.2] [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: 01/08/2024] [Indexed: 02/27/2024] Open
Abstract
Background Glucose-6-phosphate dehydrogenase (G6PD) deficiency represents a barrier to the full deployment of anti-malarial drugs for vivax malaria elimination and of first-line antibiotics. Lack of established reference ranges for G6PD activity in breast-fed infants puts them at risk of drug-induced haemolysis and restricts access to safe treatment of their mothers. Methods The present work was undertaken to establish age-specific G6PD normal values using the gold standard spectrophotometric assay to support the future clinical use of tafenoquine in lactating women and safer antibiotic treatment in infants. Results Spectrophotometric results collected at the Thai-Myanmar border from 78 healthy infants between the ages of 2 and 6 months showed a trend of decreased enzymatic activity with increasing age (which did not reach statistical significance when comparing 2-3 months old against 4-6 months old infants) and provided a reference normal value of 100% activity for infants 2-6 months old of 10.18IU/gHb. Conclusions Normal reference G6PD activity in 2-6-month-old infants was approximately 140% of that observed in G6PD normal adults from the same population. Age specific G6PD activity thresholds should be used in paediatric populations to avoid drug-induced haemolysis.
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Affiliation(s)
- Germana Bancone
- Shoklo Malaria Research Unit, Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Mae Sot, 63110, Thailand
- Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford, Oxford, OX3 7LG, UK
| | - Day Day Poe
- Shoklo Malaria Research Unit, Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Mae Sot, 63110, Thailand
| | - Gornpan Gornsawun
- Shoklo Malaria Research Unit, Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Mae Sot, 63110, Thailand
| | - Phyu Phyu Htway
- Shoklo Malaria Research Unit, Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Mae Sot, 63110, Thailand
| | - Mary Ellen Gilder
- Shoklo Malaria Research Unit, Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Mae Sot, 63110, Thailand
| | - Laypaw Archasuksan
- Shoklo Malaria Research Unit, Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Mae Sot, 63110, Thailand
| | - Kesinee Chotivanich
- Mahidol-Oxford Tropical Medicine Research Unit (MORU), Faculty of Tropical Medicine, Mahidol University, Bangkok, 10400, Thailand
| | - Rose McGready
- Shoklo Malaria Research Unit, Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Mae Sot, 63110, Thailand
- Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford, Oxford, OX3 7LG, UK
| | - Francois Nosten
- Shoklo Malaria Research Unit, Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Mae Sot, 63110, Thailand
- Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford, Oxford, OX3 7LG, UK
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10
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Ley B, Luzzatto L. Plasmodium vivax Malaria and G6PD Testing. Pathogens 2023; 12:1445. [PMID: 38133328 PMCID: PMC10748023 DOI: 10.3390/pathogens12121445] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2023] [Accepted: 12/07/2023] [Indexed: 12/23/2023] Open
Abstract
Early malaria investigators were certainly correct in classifying the species falciparum and the species vivax as belonging to the same genus, Plasmodium [...].
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Affiliation(s)
- Benedikt Ley
- Global and Tropical Health Division, Menzies School of Health Research, Charles Darwin University, Darwin, NT 0811, Australia
| | - Lucio Luzzatto
- Department of Haematology, University of Firenze, 50134 Florence, Italy
- Department of Hematology and Blood Transfusion, Muhimbili University of Health and Allied Sciences, Dar es Salaam 65001, Tanzania
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11
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Walker IS, Rogerson SJ. Pathogenicity and virulence of malaria: Sticky problems and tricky solutions. Virulence 2023; 14:2150456. [PMID: 36419237 PMCID: PMC9815252 DOI: 10.1080/21505594.2022.2150456] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2022] [Revised: 10/18/2022] [Accepted: 10/19/2022] [Indexed: 11/25/2022] Open
Abstract
Infections with Plasmodium falciparum and Plasmodium vivax cause over 600,000 deaths each year, concentrated in Africa and in young children, but much of the world's population remain at risk of infection. In this article, we review the latest developments in the immunogenicity and pathogenesis of malaria, with a particular focus on P. falciparum, the leading malaria killer. Pathogenic factors include parasite-derived toxins and variant surface antigens on infected erythrocytes that mediate sequestration in the deep vasculature. Host response to parasite toxins and to variant antigens is an important determinant of disease severity. Understanding how parasites sequester, and how antibody to variant antigens could prevent sequestration, may lead to new approaches to treat and prevent disease. Difficulties in malaria diagnosis, drug resistance, and specific challenges of treating P. vivax pose challenges to malaria elimination, but vaccines and other preventive strategies may offer improved disease control.
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Affiliation(s)
- Isobel S Walker
- Department of Infectious Diseases, The University of Melbourne, The Doherty Institute, Melbourne, Australia
| | - Stephen J Rogerson
- Department of Infectious Diseases, The University of Melbourne, The Doherty Institute, Melbourne, Australia
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12
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Barber BE, Abd-Rahman AN, Webster R, Potter AJ, Llewellyn S, Marquart L, Sahai N, Leelasena I, Birrell GW, Edstein MD, Shanks GD, Wesche D, Moehrle JJ, McCarthy JS. Characterizing the Blood-Stage Antimalarial Activity of Tafenoquine in Healthy Volunteers Experimentally Infected With Plasmodium falciparum. Clin Infect Dis 2023; 76:1919-1927. [PMID: 36795050 PMCID: PMC10249991 DOI: 10.1093/cid/ciad075] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2022] [Revised: 01/10/2023] [Accepted: 02/08/2023] [Indexed: 02/17/2023] Open
Abstract
BACKGROUND The long-acting 8-aminoquinoline tafenoquine may be a good candidate for mass drug administration if it exhibits sufficient blood-stage antimalarial activity at doses low enough to be tolerated by glucose 6-phosphate dehydrogenase (G6PD)-deficient individuals. METHODS Healthy adults with normal levels of G6PD were inoculated with Plasmodium falciparum 3D7-infected erythrocytes on day 0. Different single oral doses of tafenoquine were administered on day 8. Parasitemia and concentrations of tafenoquine and the 5,6-orthoquinone metabolite in plasma/whole blood/urine were measured and standard safety assessments performed. Curative artemether-lumefantrine therapy was administered if parasite regrowth occurred, or on day 48 ± 2. Outcomes were parasite clearance kinetics, pharmacokinetic and pharmacokinetic/pharmacodynamic (PK/PD) parameters from modelling, and dose simulations in a theoretical endemic population. RESULTS Twelve participants were inoculated and administered 200 mg (n = 3), 300 mg (n = 4), 400 mg (n = 2), or 600 mg (n = 3) tafenoquine. The parasite clearance half-life with 400 mg or 600 mg (5.4 hours and 4.2 hours, respectively) was faster than with 200 mg or 300 mg (11.8 hours and 9.6 hours, respectively). Parasite regrowth occurred after dosing with 200 mg (3/3 participants) and 300 mg (3/4 participants) but not after 400 mg or 600 mg. Simulations using the PK/PD model predicted that 460 mg and 540 mg would clear parasitaemia by a factor of 106 and 109, respectively, in a 60-kg adult. CONCLUSIONS Although a single dose of tafenoquine exhibits potent P. falciparum blood-stage antimalarial activity, the estimated doses to effectively clear asexual parasitemia will require prior screening to exclude G6PD deficiency. Clinical Trials Registration. Australian and New Zealand Clinical Trials Registry (ACTRN12620000995976).
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Affiliation(s)
- Bridget E Barber
- QIMR Berghofer Medical Research Institute, Brisbane, Australia
- University of the Sunshine Coast, Morayfield, Australia
- Royal Brisbane and Women's Hospital, Brisbane, Australia
| | | | - Rebecca Webster
- QIMR Berghofer Medical Research Institute, Brisbane, Australia
| | - Adam J Potter
- QIMR Berghofer Medical Research Institute, Brisbane, Australia
| | | | - Louise Marquart
- QIMR Berghofer Medical Research Institute, Brisbane, Australia
- The University of Queensland, Brisbane, Australia
| | - Nischal Sahai
- University of the Sunshine Coast, Morayfield, Australia
| | | | - Geoffrey W Birrell
- Australian Defence Force Malaria and Infectious Disease Institute, Brisbane, Australia
| | - Michael D Edstein
- Australian Defence Force Malaria and Infectious Disease Institute, Brisbane, Australia
| | - G Dennis Shanks
- Australian Defence Force Malaria and Infectious Disease Institute, Brisbane, Australia
| | | | | | - James S McCarthy
- QIMR Berghofer Medical Research Institute, Brisbane, Australia
- The Peter Doherty Institute for Infection and Immunity, Melbourne, Australia
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13
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Webster R, Mitchell H, Peters JM, Heunis J, O'Neill B, Gower J, Lynch S, Jennings H, Amante FH, Llewellyn S, Marquart L, Potter AJ, Birrell GW, Edstein MD, Shanks GD, McCarthy JS, Barber BE. Transmission Blocking Activity of Low-dose Tafenoquine in Healthy Volunteers Experimentally Infected With Plasmodium falciparum. Clin Infect Dis 2023; 76:506-512. [PMID: 35731843 DOI: 10.1093/cid/ciac503] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2022] [Revised: 06/13/2022] [Accepted: 06/16/2022] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Blocking the transmission of parasites from humans to mosquitoes is a key component of malaria control. Tafenoquine exhibits activity against all stages of the malaria parasite and may have utility as a transmission blocking agent. We aimed to characterize the transmission blocking activity of low-dose tafenoquine. METHODS Healthy adults were inoculated with Plasmodium falciparum 3D7-infected erythrocytes on day 0. Piperaquine was administered on days 9 and 11 to clear asexual parasitemia while allowing gametocyte development. A single 50-mg oral dose of tafenoquine was administered on day 25. Transmission was determined by enriched membrane feeding assays predose and at 1, 4, and 7 days postdose. Artemether-lumefantrine was administered following the final assay. Outcomes were the reduction in mosquito infection and gametocytemia after tafenoquine and safety parameters. RESULTS Six participants were enrolled, and all were infective to mosquitoes before tafenoquine, with a median 86% (range, 22-98) of mosquitoes positive for oocysts and 57% (range, 4-92) positive for sporozoites. By day 4 after tafenoquine, the oocyst and sporozoite positivity rate had reduced by a median 35% (interquartile range [IQR]: 16-46) and 52% (IQR: 40-62), respectively, and by day 7, 81% (IQR 36-92) and 77% (IQR 52-98), respectively. The decline in gametocyte density after tafenoquine was not significant. No significant participant safety concerns were identified. CONCLUSIONS Low-dose tafenoquine (50 mg) reduces P. falciparum transmission to mosquitoes, with a delay in effect.
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Affiliation(s)
- Rebecca Webster
- QIMR Berghofer Medical Research Institute, Brisbane, Australia
| | - Hayley Mitchell
- QIMR Berghofer Medical Research Institute, Brisbane, Australia
| | - Jenny M Peters
- QIMR Berghofer Medical Research Institute, Brisbane, Australia
| | - Juanita Heunis
- QIMR Berghofer Medical Research Institute, Brisbane, Australia
| | - Brighid O'Neill
- QIMR Berghofer Medical Research Institute, Brisbane, Australia
| | - Jeremy Gower
- QIMR Berghofer Medical Research Institute, Brisbane, Australia
| | - Sean Lynch
- QIMR Berghofer Medical Research Institute, Brisbane, Australia
| | - Helen Jennings
- QIMR Berghofer Medical Research Institute, Brisbane, Australia
| | - Fiona H Amante
- QIMR Berghofer Medical Research Institute, Brisbane, Australia
| | | | | | - Adam J Potter
- QIMR Berghofer Medical Research Institute, Brisbane, Australia
| | - Geoffrey W Birrell
- Australian Defence Force Malaria and Infectious Disease Institute, Brisbane, Australia
| | - Michael D Edstein
- Australian Defence Force Malaria and Infectious Disease Institute, Brisbane, Australia
| | - G Dennis Shanks
- Australian Defence Force Malaria and Infectious Disease Institute, Brisbane, Australia
| | - James S McCarthy
- QIMR Berghofer Medical Research Institute, Brisbane, Australia.,The Peter Doherty Institute for Infection and Immunity, Melbourne, Australia
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14
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Risk of hemolysis in Plasmodium vivax malaria patients receiving standard primaquine treatment in a population with high prevalence of G6PD deficiency. Infection 2023; 51:213-222. [PMID: 35976559 PMCID: PMC9892342 DOI: 10.1007/s15010-022-01905-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2022] [Accepted: 08/07/2022] [Indexed: 02/04/2023]
Abstract
BACKGROUND Primaquine is essential for the radical cure of Plasmodium vivax malaria, but it poses a potential danger of severe hemolysis in G6PD-deficient (G6PDd) patients. This study aimed to determine whether primaquine is safe in a population with high G6PD prevalence but lacking G6PD diagnosis capacity. METHODS In Myanmar, 152 vivax patients were gender- and age-matched at 1:3 for G6PDd versus G6PD-normal (G6PDn). Their risk of acute hemolysis was followed for 28 days after treatment with the standard chloroquine and 14-day primaquine (0.25 mg/kg/day) regimen. RESULTS Patients anemic and non-anemic at enrollment showed a rising and declining trend in the mean hemoglobin level, respectively. In males, the G6PDd group showed substantially larger magnitudes of hemoglobin reduction and lower hemoglobin nadir levels than the G6PDn group, but this trend was not evident in females. Almost 1/3 of the patients experienced clinically concerning declines in hemoglobin, with five requiring blood transfusion. CONCLUSIONS The standard 14-day primaquine regimen carries a significant risk of acute hemolytic anemia (AHA) in vivax patients without G6PD testing in a population with a high prevalence of G6PD deficiency and anemia. G6PD testing would avoid most of the clinically significant Hb reductions and AHA in male patients.
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15
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Sustainable Radical Cure of the Latent Malarias. Infect Dis (Lond) 2023. [DOI: 10.1007/978-1-0716-2463-0_896] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/09/2023] Open
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16
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Drysdale M, Tan L, Martin A, Fuhrer IB, Duparc S, Sharma H. Plasmodium vivax in Children: Hidden Burden and Conspicuous Challenges, a Narrative Review. Infect Dis Ther 2023; 12:33-51. [PMID: 36378465 PMCID: PMC9868225 DOI: 10.1007/s40121-022-00713-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Accepted: 10/05/2022] [Indexed: 11/16/2022] Open
Abstract
There has been progress towards decreasing malaria prevalence globally; however, Plasmodium vivax has been less responsive to elimination efforts compared with Plasmodium falciparum. P. vivax malaria remains a serious public health concern in regions where it is the dominant species (South and South-East Asia, the Eastern Mediterranean region, and South America) and is increasingly recognized for its contribution to overall morbidity and mortality worldwide. The incidence of P. vivax decreases with increasing age owing to rapidly acquired clinical immunity and there is a disproportionate burden of P. vivax in infants and children, who remain highly vulnerable to severe disease, recurrence, and anemia with associated developmental impacts. Diagnosis is sometimes difficult owing to the sensitivity of diagnostic tests to detect low levels of parasitemia. Additionally, the propensity of P. vivax to relapse following reactivation of dormant hypnozoites in the liver contributes to disease recurrence in infants and children, and potentiates morbidity and transmission. The 8-aminoquinolines, primaquine and tafenoquine, provide radical cure (relapse prevention). However, the risk of hemolysis in patients with glucose-6-phosphate dehydrogenase (G6PD) deficiency necessitates testing prior to administration of 8-aminoquinolines, which has limited their uptake. Additional challenges include lack of availability of pediatric dose formulations and problems with adherence to primaquine owing to the length of treatment recommended. A paucity of data and studies specific to pediatric P. vivax malaria impacts the ability to deliver targeted interventions. It is imperative that P. vivax in infants and children be the focus of future research, control initiatives, and anti-malarial drug development.
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Affiliation(s)
| | - Lionel Tan
- GSK, 980 Great West Road, Brentford, TW8 9GS Middlesex UK
| | - Ana Martin
- GSK, 980 Great West Road, Brentford, TW8 9GS Middlesex UK
| | | | | | - Hema Sharma
- GSK, 980 Great West Road, Brentford, TW8 9GS Middlesex UK
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17
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Bancone G, Poe DD, Gornsawun G, Htway PP, Gilder ME, Archasuksan L, Chotivanich K, McGready R, Nosten F. Reference spectrophotometric values for glucose-6-phosphate dehydrogenase activity in two-to six-month-old infants on the Thailand-Myanmar border. Wellcome Open Res 2022. [DOI: 10.12688/wellcomeopenres.18417.1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Background: Glucose-6-phosphate dehydrogenase (G6PD) deficiency represents a barrier to the full deployment of anti-malarial drugs for vivax malaria elimination and of first-line antibiotics. Lack of established reference ranges for G6PD activity in breast-fed infants puts them at risk of drug-induced haemolysis and restricts access to safe treatment of their mothers. Methods: The present work was undertaken to establish age-specific G6PD normal values using the gold standard spectrophotometric assay to support the future clinical use of tafenoquine in lactating women and safer antibiotic treatment in infants. Results: Spectrophotometric results from 78 healthy infants between the ages of 2 and 6 months showed a trend of decreased enzymatic activity with increasing age and provided a reference normal value of 100% activity for infants 2-6 months old of 10.18IU/gHb. Conclusions: Normal reference G6PD activity in 2–6-month-old infants was approximately 140% of that observed in G6PD normal adults from the same population. Age specific G6PD activity thresholds should be used in paediatric populations to avoid drug-induced haemolysis.
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18
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Sudsumrit S, Chamchoy K, Songdej D, Adisakwattana P, Krudsood S, Adams ER, Imwong M, Leartsakulpanich U, Boonyuen U. Genotype-phenotype association and biochemical analyses of glucose-6-phosphate dehydrogenase variants: Implications for the hemolytic risk of using 8-aminoquinolines for radical cure. Front Pharmacol 2022; 13:1032938. [PMID: 36339627 PMCID: PMC9631214 DOI: 10.3389/fphar.2022.1032938] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Accepted: 10/11/2022] [Indexed: 09/02/2023] Open
Abstract
Background: Plasmodium vivax remains the malaria species posing a major threat to human health worldwide owing to its relapse mechanism. Currently, the only drugs of choice for radical cure are the 8-aminoquinolines (primaquine and tafenoquine), which are capable of killing hypnozoites and thus preventing P. vivax relapse. However, the therapeutic use of primaquine and tafenoquine is restricted because these drugs can cause hemolysis in individuals with glucose-6-phosphate dehydrogenase (G6PD) deficiency. This study aimed to assess and understand the hemolytic risk of using 8-aminoquinolines for radical treatment in a malaria endemic area of Thailand. Methods: The prevalence of G6PD deficiency was determined using a quantitative test in 1,125 individuals. Multiplexed high-resolution meltinging (HRM) assays were developed and applied to detect 12 G6PD mutations. Furthermore, biochemical and structural characterization of G6PD variants was carried out to understand the molecular basis of enzyme deficiency. Results: The prevalence of G6PD deficiency was 6.76% (76/1,125), as assessed by a phenotypic test. Multiplexed HRM assays revealed G6PD Mahidol in 15.04% (77/512) of males and 28.38% (174/613) of females, as well as G6PD Aures in one female. G6PD activity above the 30% cut-off was detected in those carrying G6PD Mahidol, even in hemizygous male individuals. Two variants, G6PD Murcia Oristano and G6PD Songklanagarind + Viangchan, were identified for the first time in Thailand. Biochemical characterization revealed that structural instability is the primary cause of enzyme deficiency in G6PD Aures, G6PD Murcia Oristano, G6PD Songklanagarind + Viangchan, and G6PD Chinese 4 + Viangchan, with double G6PD mutations causing more severe enzyme deficiency. Conclusion: In western Thailand, up to 22% of people may be ineligible for radical cure. Routine qualitative tests may be insufficient for G6PD testing, so quantitative tests should be implemented. G6PD genotyping should also be used to confirm G6PD status, especially in female individuals suspected of having G6PD deficiency. People with double G6PD mutations are more likely to have hemolysis than are those with single G6PD mutations because the double mutations significantly reduce the catalytic activity as well as the structural stability of the protein.
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Affiliation(s)
- Sirapapha Sudsumrit
- Department of Molecular Tropical Medicine and Genetics, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Kamonwan Chamchoy
- Princess Srisavangavadhana College of Medicine, Chulabhorn Royal Academy, Bangkok, Thailand
| | - Duantida Songdej
- Department of Pediatrics, Faculty of Medicine Ramathibodi Hospital, Mahidol University, Bangkok, Thailand
| | - Poom Adisakwattana
- Department of Helminthology, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Srivicha Krudsood
- Department of Tropical Hygiene, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Emily R. Adams
- Research Centre for Drugs and Diagnostics, Liverpool School of Tropical Medicine, Liverpool, United Kingdom
| | - Mallika Imwong
- Department of Molecular Tropical Medicine and Genetics, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Ubolsree Leartsakulpanich
- National Center for Genetic Engineering and Biotechnology, National Science and Technology Development Agency, Pathumthani, Thailand
| | - Usa Boonyuen
- Department of Molecular Tropical Medicine and Genetics, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
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Preparation of Decoquinate Solid Dispersion by Hot-Melt Extrusion as an Oral Dosage Form Targeting Liver-Stage Plasmodium Infection. Antimicrob Agents Chemother 2022; 66:e0221821. [PMID: 35658489 DOI: 10.1128/aac.02218-21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Liver-stage Plasmodium in humans is an early stage of malarial infection. Decoquinate (DQ) has a potent multistage antimalarial activity. However, it is practically water insoluble. In this study, the hot-melt extrusion (HME) approach was employed to prepare solid dispersions of DQ to improve oral bioavailability. The DQ dispersions were homogeneous in an aqueous suspension that contained most DQ (>90%) in the aqueous phase. Soluplus, a solubilizer, was found compatible with DQ in forming nanoparticle formulations during the HME process. Another excipient HPMC AS-126 was also proven to be suitable for making DQ nanoparticles through HME. Particle size and antimalarial activity of HME DQ suspensions remained almost unchanged after storage at 4°C for over a year. HME DQ was highly effective at inhibiting Plasmodium infection in vitro at both the liver stage and blood stage. HME DQ at 3 mg/kg by oral administration effectively prevented Plasmodium infection in mice inoculated with Plasmodium berghei sporozoites. Orally administered HME DQ at 2,000 mg/kg to mice showed no obvious adverse effects. HME DQ at 20 mg/kg orally administered to rats displayed characteristic distributions of DQ in the blood with most DQ in the blood cells, revealing the permeability of HME DQ into the cells in relation to its antimalarial activity. The DQ dispersions may be further developed as an oral formulation targeting Plasmodium infection at the liver stage.
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Flaherty S, Strauch P, Maktabi M, Pybus BS, Reichard G, Walker LA, Rochford R. Mechanisms of 8-aminoquinoline induced haemolytic toxicity in a G6PDd humanized mouse model. J Cell Mol Med 2022; 26:3675-3686. [PMID: 35665597 PMCID: PMC9258708 DOI: 10.1111/jcmm.17362] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2022] [Revised: 03/29/2022] [Accepted: 04/05/2022] [Indexed: 11/29/2022] Open
Abstract
Primaquine (PQ) and Tafenoquine (TQ) are clinically important 8‐aminoquinolines (8‐AQ) used for radical cure treatment of P. vivax infection, known to target hepatic hypnozoites. 8‐AQs can trigger haemolytic anaemia in individuals with glucose‐6‐phosphate dehydrogenase deficiency (G6PDd), yet the mechanisms of haemolytic toxicity remain unknown. To address this issue, we used a humanized mouse model known to predict haemolytic toxicity responses in G6PDd human red blood cells (huRBCs). To evaluate the markers of eryptosis, huRBCs were isolated from mice 24–48 h post‐treatment and analysed for effects on phosphatidylserine (PS), intracellular reactive oxygen species (ROS) and autofluorescence. Urinalysis was performed to evaluate the occurrence of intravascular and extravascular haemolysis. Spleen and liver tissue harvested at 24 h and 5–7 days post‐treatment were stained for the presence of CD169+ macrophages, F4/80+ macrophages, Ter119+ mouse RBCs, glycophorin A+ huRBCs and murine reticulocytes (muRetics). G6PDd‐huRBCs from PQ/TQ treated mice showed increased markers for eryptosis as early as 24 h post‐treatment. This coincided with an early rise in levels of muRetics. Urinalysis revealed concurrent intravascular and extravascular haemolysis in response to PQ/TQ. Splenic CD169+ macrophages, present in all groups at day 1 post‐dosing were eliminated by days 5–7 in PQ/TQ treated mice only, while liver F4/80 macrophages and iron deposits increased. Collectively, our data suggest 8‐AQ treated G6PDd‐huRBCs have early physiological responses to treatment, including increased markers for eryptosis indicative of oxidative stress, resulting in extramedullary haematopoiesis and loss of splenic CD169+ macrophages, prompting the liver to act as the primary site of clearance.
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Affiliation(s)
- Siobhan Flaherty
- Department of Immunology and Microbiology, The University of Colorado School of Medicine, Aurora, Colorado, USA
| | - Pamela Strauch
- Department of Immunology and Microbiology, The University of Colorado School of Medicine, Aurora, Colorado, USA
| | - Mahdi Maktabi
- Department of Immunology and Microbiology, The University of Colorado School of Medicine, Aurora, Colorado, USA
| | - Brandon S Pybus
- Division of Experimental Therapeutics, Walter Reed Army Institute of Research, Silver Spring, Maryland, USA
| | - Gregory Reichard
- Department of Drug Discovery, Experimental Therapeutics Branch, Walter Reed Army Institute of Research, Silver Spring, Maryland, USA
| | - Larry A Walker
- National Center for Natural Products Research and Department of Biomolecular Sciences, School of Pharmacy, The University of Mississippi, University, Mississippi, USA
| | - Rosemary Rochford
- Department of Immunology and Microbiology, The University of Colorado School of Medicine, Aurora, Colorado, USA
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21
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Eficacia de la tafenoquina en la profilaxis y tratamiento de la malaria por Plasmodium vivax, revisión sistemática y metaanálisis. BIOMÉDICA 2022; 42:364-377. [PMID: 35867928 PMCID: PMC9451530 DOI: 10.7705/biomedica.5988] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Indexed: 12/04/2022]
Abstract
Introducción. La tafenoquina fue aprobada en el 2018 por la Food and Drug Administration de Estados Unidos y, en el 2019, por la Therapeutic Goods Administration en Australia. Su administración en dosis única y su mecanismo de acción en las fases aguda y latente han sido objeto de estudio para cambiar el esquema de tratamiento de la malaria por Plasmodium vivax. Objetivo. Evaluar la evidencia científica disponible sobre la eficacia de la tafenoquina en la profilaxis y el tratamiento de la malaria por P. vivax, entre el 2009 y el 2019. Materiales y métodos. Se establecieron los descriptores MeSH y DeCS. Se utilizó la sintaxis ((Malaria Vivax) AND (tafenoquine) AND (prophylaxis)) OR [(Malaria Vivax) AND (tafenoquine) AND (relapse)] en las siguientes bases de datos: Pubmed, The Cochrane Central Register of Controlled Clinical Trials (CENTRAL), ISIS Web of Science, Lilacs y Scopus. Los resultados obtenidos se sometieron a análisis crítico (matriz CASPE). El análisis cuantitativo se realizó utilizando la diferencia de riesgos en análisis de supervivencia (Kaplan-Meier) en los tres artículos finales. Resultados. Se sometieron tres estudios a metaanálisis (Llanos-Cuentas, 2014; Llanos- Cuentas, 2019, y Lacerda, 2019) para evaluar la eficacia del tratamiento con tafenoquina en comparación con primaquina. Se obtuvo una diferencia de riesgo global de 0,04 (IC95% 0-0,08; p=0,07). La tafenoquina no mostró inferioridad en la eficacia del tratamiento frente al esquema de primaquina. Conclusión. La tafenoquina es una alternativa que mejora el cumplimiento del tratamiento, lo que podría acercar a Colombia a las metas de la Estrategia Técnica Mundial contra la Malaria, 2016-2030.
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22
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Stone W, Mahamar A, Smit MJ, Sanogo K, Sinaba Y, Niambele SM, Sacko A, Keita S, Dicko OM, Diallo M, Maguiraga SO, Samake S, Attaher O, Lanke K, Ter Heine R, Bradley J, McCall MBB, Issiaka D, Traore SF, Bousema T, Drakeley C, Dicko A. Single low-dose tafenoquine combined with dihydroartemisinin-piperaquine to reduce Plasmodium falciparum transmission in Ouelessebougou, Mali: a phase 2, single-blind, randomised clinical trial. THE LANCET. MICROBE 2022; 3:e336-e347. [PMID: 35544095 PMCID: PMC9042793 DOI: 10.1016/s2666-5247(21)00356-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/11/2021] [Revised: 12/07/2021] [Accepted: 12/15/2021] [Indexed: 11/20/2022]
Abstract
BACKGROUND Tafenoquine was recently approved as a prophylaxis and radical cure for Plasmodium vivax infection, but its Plasmodium falciparum transmission-blocking efficacy is unclear. We aimed to establish the efficacy and safety of three single low doses of tafenoquine in combination with dihydroartemisinin-piperaquine for reducing gametocyte density and transmission to mosquitoes. METHODS In this four-arm, single-blind, phase 2, randomised controlled trial, participants were recruited at the Clinical Research Unit of the Malaria Research and Training Centre of the University of Bamako in Mali. Eligible participants were aged 12-50 years, with asymptomatic P falciparum microscopy-detected gametocyte carriage, had a bodyweight of 80 kg or less, and had no clinical signs of malaria defined by fever. Participants were randomly assigned (1:1:1:1) to standard treatment with dihydroartemisinin-piperaquine, or dihydroartemisinin-piperaquine plus a single dose of tafenoquine (in solution) at a final dosage of 0·42 mg/kg, 0·83 mg/kg, or 1·66 mg/kg. Randomisation was done with a computer-generated randomisation list and concealed with sealed, opaque envelopes. Dihydroartemisinin-piperaquine was administered as oral tablets over 3 days (day 0, 1, and 2), as per manufacturer instructions. A single dose of tafenoquine was administered as oral solution on day 0 in parallel with the first dose of dihydroartemisinin-piperaquine. Tafenoquine dosing was based on bodyweight to standardise efficacy and risk variance. The primary endpoint, assessed in the per-protocol population, was median percentage change in mosquito infection rate 7 days after treatment compared with baseline. Safety endpoints included frequency and incidence of adverse events. The final follow-up visit was on Dec 23, 2021; the trial is registered with ClinicalTrials.gov, NCT04609098. FINDINGS From Oct 29 to Nov 25, 2020, 1091 individuals were screened for eligibility, 80 of whom were enrolled and randomly assigned (20 per treatment group). Before treatment, 53 (66%) individuals were infectious to mosquitoes, infecting median 12·50% of mosquitoes (IQR 3·64-35·00). Within-group reduction in mosquito infection rate on day 7 was 79·95% (IQR 57·15-100; p=0·0005 for difference from baseline) following dihydroartemisinin-piperaquine only, 100% (98·36-100; p=0·0005) following dihydroartemisinin-piperaquine plus tafenoquine 0·42 mg/kg, 100% (100-100; p=0·0001) following dihydroartemisinin-piperaquine plus tafenoquine 0·83 mg/kg, and 100% (100-100; p=0·0001) following dihydroartemisinin-piperaquine plus tafenoquine 1·66 mg/kg. 55 (69%) of 80 participants had a total of 94 adverse events over the course of the trial; 86 (92%) adverse events were categorised as mild, seven (7%) as moderate, and one (1%) as severe. The most common treatment-related adverse event was mild or moderate headache, which occurred in 15 (19%) participants (dihydroartemisinin-piperaquine n=2; dihydroartemisinin-piperaquine plus tafenoquine 0·42 mg/kg n=6; dihydroartemisinin-piperaquine plus tafenoquine 0·83 mg/kg n=3; and dihydroartemisinin-piperaquine plus tafenoquine 1·66 mg/kg n=4). No serious adverse events occurred. No significant differences in the incidence of all adverse events (p=0·73) or treatment-related adverse events (p=0·62) were observed between treatment groups. INTERPRETATION Tafenoquine was well tolerated at all doses and accelerated P falciparum gametocyte clearance. All tafenoquine doses showed improved transmission reduction at day 7 compared with dihydroartemisinin-piperaquine alone. These data support the case for further research on tafenoquine as a transmission-blocking supplement to standard antimalarials. FUNDING Bill & Melinda Gates Foundation. TRANSLATIONS For the French, Portuguese, Spanish and Swahili translations of the abstract see Supplementary Materials section.
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Affiliation(s)
- Will Stone
- Department of Infection Biology, London School of Hygiene & Tropical Medicine, London, UK.
| | - Almahamoudou Mahamar
- Malaria Research and Training Centre, Faculty of Pharmacy and Faculty of Medicine and Dentistry, University of Sciences Techniques and Technologies of Bamako, Bamako, Mali
| | - Merel J Smit
- Department of Medical Microbiology and Radboud Center for Infectious Diseases, Radboud University Medical Center, University of Nijmegen, Nijmegen, Netherlands
| | - Koualy Sanogo
- Malaria Research and Training Centre, Faculty of Pharmacy and Faculty of Medicine and Dentistry, University of Sciences Techniques and Technologies of Bamako, Bamako, Mali
| | - Youssouf Sinaba
- Malaria Research and Training Centre, Faculty of Pharmacy and Faculty of Medicine and Dentistry, University of Sciences Techniques and Technologies of Bamako, Bamako, Mali
| | - Sidi M Niambele
- Malaria Research and Training Centre, Faculty of Pharmacy and Faculty of Medicine and Dentistry, University of Sciences Techniques and Technologies of Bamako, Bamako, Mali
| | - Adama Sacko
- Malaria Research and Training Centre, Faculty of Pharmacy and Faculty of Medicine and Dentistry, University of Sciences Techniques and Technologies of Bamako, Bamako, Mali
| | - Sekouba Keita
- Malaria Research and Training Centre, Faculty of Pharmacy and Faculty of Medicine and Dentistry, University of Sciences Techniques and Technologies of Bamako, Bamako, Mali
| | - Oumar M Dicko
- Malaria Research and Training Centre, Faculty of Pharmacy and Faculty of Medicine and Dentistry, University of Sciences Techniques and Technologies of Bamako, Bamako, Mali
| | - Makonon Diallo
- Malaria Research and Training Centre, Faculty of Pharmacy and Faculty of Medicine and Dentistry, University of Sciences Techniques and Technologies of Bamako, Bamako, Mali
| | - Seydina O Maguiraga
- Malaria Research and Training Centre, Faculty of Pharmacy and Faculty of Medicine and Dentistry, University of Sciences Techniques and Technologies of Bamako, Bamako, Mali
| | - Siaka Samake
- Malaria Research and Training Centre, Faculty of Pharmacy and Faculty of Medicine and Dentistry, University of Sciences Techniques and Technologies of Bamako, Bamako, Mali
| | - Oumar Attaher
- Malaria Research and Training Centre, Faculty of Pharmacy and Faculty of Medicine and Dentistry, University of Sciences Techniques and Technologies of Bamako, Bamako, Mali
| | - Kjerstin Lanke
- Department of Medical Microbiology and Radboud Center for Infectious Diseases, Radboud University Medical Center, University of Nijmegen, Nijmegen, Netherlands
| | - Rob Ter Heine
- Department of Pharmacy and Radboud Center for Infectious Diseases, Radboud University Medical Center, University of Nijmegen, Nijmegen, Netherlands
| | - John Bradley
- MRC International Statistics and Epidemiology Group, London School of Hygiene & Tropical Medicine, London, UK
| | - Matthew B B McCall
- Department of Medical Microbiology and Radboud Center for Infectious Diseases, Radboud University Medical Center, University of Nijmegen, Nijmegen, Netherlands
| | - Djibrilla Issiaka
- Malaria Research and Training Centre, Faculty of Pharmacy and Faculty of Medicine and Dentistry, University of Sciences Techniques and Technologies of Bamako, Bamako, Mali
| | - Sekou F Traore
- Malaria Research and Training Centre, Faculty of Pharmacy and Faculty of Medicine and Dentistry, University of Sciences Techniques and Technologies of Bamako, Bamako, Mali
| | - Teun Bousema
- Department of Medical Microbiology and Radboud Center for Infectious Diseases, Radboud University Medical Center, University of Nijmegen, Nijmegen, Netherlands
| | - Chris Drakeley
- Department of Infection Biology, London School of Hygiene & Tropical Medicine, London, UK
| | - Alassane Dicko
- Malaria Research and Training Centre, Faculty of Pharmacy and Faculty of Medicine and Dentistry, University of Sciences Techniques and Technologies of Bamako, Bamako, Mali
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Llanos-Cuentas A, Manrrique P, Rosas-Aguirre A, Herrera S, Hsiang MS. Tafenoquine for the treatment of Plasmodium vivax malaria. Expert Opin Pharmacother 2022; 23:759-768. [PMID: 35379070 DOI: 10.1080/14656566.2022.2058394] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
INTRODUCTION Plasmodium vivax malaria causes significant disease burden worldwide, especially in Latin America, Southeast Asia, and Oceania. P. vivax is characterized by the production of liver hypnozoites that cause clinical relapses upon periodic activation. Primaquine, an 8-aminoquinoline drug, has been the standard of care for decades to treat liver-stage P. vivax malaria; however, it requires long treatment regimens (one to two weeks) that lead to poor adherence and thus clinical relapses. Tafenoquine (TFQ), a newly available and efficacious single-dose 8-aminoquinoline, aims to address this challenge. Safe administration is possible when paired with the use of glucose-6-phosphate dehydrogenase (G6PD) diagnostics to prevent 8-aminoquinoline-induced hemolysis in patients with underlying G6PD deficiency (G6PDd). AREAS COVERED In this review, the authors present the recent literature regarding the pharmacology, efficacy, safety, and tolerability of TFQ and highlight regional differences in these areas. The authors also discuss the potential for TFQ, complemented with primaquine PQ and effective screening for G6PDd, to improve P. vivax clinical management and facilitate targeted mass drug administration in communities to decrease transmission. EXPERT OPINION Clinical studies show therapeutic efficacy of TFQ as well as a good performance in terms of safety and tolerability. Additional research regarding the effectiveness and safety TFQ in malaria elimination strategies such as targeted or mass drug administration are needed.
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Affiliation(s)
| | - Paulo Manrrique
- Department of Immunology and Infectious Diseases, Harvard T.H. Chan School of Public Health, Boston, PA, USA
| | - Angel Rosas-Aguirre
- Public Health and Administration, Universidad Peruana Cayetano Heredia, Lima, Peru
| | - Sonia Herrera
- Department of Epidemiology, Division of Infectious Diseases and Global Health, Department of Pediatrics, Division of Pediatric Infectious Diseases, University of California San Francisco, San Francisco, CA, United States
| | - Michelle S Hsiang
- Department of Epidemiology, Division of Infectious Diseases and Global Health, Department of Pediatrics, Division of Pediatric Infectious Diseases, University of California San Francisco, San Francisco, CA, United States.,Department of Epidemiology and Biostatistics, University of California San Francisco (UCSF), San Francisco, CA, USA.,Department of PediatricsUniversity of California San Francisco (UCSF), San Francisco, CA, USA
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24
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Chamma-Siqueira NN, Negreiros SC, Ballard SB, Farias S, Silva SP, Chenet SM, Santos EJM, Pereira de Sena LW, Póvoa da Costa F, Cardoso-Mello AGN, Marchesini PB, Peterka CRL, Viana GMR, Macedo de Oliveira A. Higher-Dose Primaquine to Prevent Relapse of Plasmodium vivax Malaria. N Engl J Med 2022; 386:1244-1253. [PMID: 35353962 PMCID: PMC9132489 DOI: 10.1056/nejmoa2104226] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
BACKGROUND In most of the Americas, the recommended treatment to prevent relapse of Plasmodium vivax malaria is primaquine at a total dose of 3.5 mg per kilogram of body weight, despite evidence of only moderate efficacy. METHODS In this trial conducted in Brazil, we evaluated three primaquine regimens to prevent relapse of P. vivax malaria in children at least 5 years of age and in adults with microscopy-confirmed P. vivax monoinfection. All the patients received directly observed chloroquine for 3 days (total dose, 25 mg per kilogram). Group 1 received a total primaquine dose of 3.5 mg per kilogram (0.5 mg per kilogram per day) over 7 days with unobserved administration; group 2 received the same regimen as group 1 but with observed administration; and group 3 received a total primaquine dose of 7.0 mg per kilogram over 14 days (also 0.5 mg per kilogram per day) with observed administration. We monitored the patients for 168 days. RESULTS We enrolled 63 patients in group 1, 96 in group 2, and 95 in group 3. The median age of the patients was 22.4 years (range, 5.4 to 79.8). By day 28, three P. vivax recurrences were observed: 2 in group 1 and 1 in group 2. By day 168, a total of 70 recurrences had occurred: 24 in group 1, 34 in group 2, and 12 in group 3. No serious adverse events were noted. On day 168, the percentage of patients without recurrence was 58% (95% confidence interval [CI], 44 to 70) in group 1, 59% (95% CI, 47 to 69) in group 2, and 86% (95% CI, 76 to 92) in group 3. Survival analysis showed a difference in the day 168 recurrence-free percentage of 27 percentage points (97.5% CI, 10 to 44; P<0.001) between group 1 and group 3 and a difference of 27 percentage points (97.5% CI, 12 to 42; P<0.001) between group 2 and group 3. CONCLUSIONS The administration of primaquine at a total dose of 7.0 mg per kilogram had higher efficacy in preventing relapse of P. vivax malaria than a total dose of 3.5 mg per kilogram through day 168. (Supported by the U.S. Agency for International Development; ClinicalTrials.gov number, NCT03610399.).
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Affiliation(s)
- Nathália N Chamma-Siqueira
- From Instituto Evandro Chagas, Ministério da Saúde do Brasil, Ananindeua (N.N.C-.S., S.P.S., G.M.R.V.), Programa de Pós-Graduação em Biologia de Agentes Infecciosos e Parasitários (N.N.C.-S., E.J.M.S., F.P.C., G.M.R.V.) and Laboratório de Genética de Doenças Complexas (E.J.M.S., F.P.C.), Instituto de Ciências Biológicas, and Laboratório de Farmacocinética de Drogas Antimaláricas, Instituto de Ciências da Saúde (L.W.P.S., A.G.N.C.-M.), Universidade Federal do Pará, Belém, Secretaria de Saúde do Estado do Acre, Cruzeiro do Sul (S.C.N., S.F.), and Grupo Técnico da Malária, Coordenação-Geral de Vigilância de Zoonoses e Doenças de Transmissão Vetorial, Departamento de Imunização e Doenças Transmissíveis, Secretaria de Vigilância em Saúde, Ministério da Saúde (P.B.M.), and Diretoria de Vigilância Epidemiológica, Subsecretaria de Vigilância em Saúde, Secretaria Estadual de Saúde do Distrito Federal (C.R.L.P.), Brasília - all in Brazil; Epidemic Intelligence Service, Center for Surveillance, Epidemiology, and Laboratory Services (S.-B.B.), and the Malaria Branch, Division of Parasitic Diseases and Malaria, Center for Global Health, Centers for Disease Control and Prevention (S.-B.B., A.M.O.) - both in Atlanta; and Instituto de Investigaciones en Ciencias Biomedicas, Universidad Ricardo Palma, Lima, and Instituto de Enfermedades Tropicales, Universidad Nacional Toribio Rodríguez de Mendoza de Amazonas, Chachapoyas (S.M.C.) - both in Peru
| | - Suiane C Negreiros
- From Instituto Evandro Chagas, Ministério da Saúde do Brasil, Ananindeua (N.N.C-.S., S.P.S., G.M.R.V.), Programa de Pós-Graduação em Biologia de Agentes Infecciosos e Parasitários (N.N.C.-S., E.J.M.S., F.P.C., G.M.R.V.) and Laboratório de Genética de Doenças Complexas (E.J.M.S., F.P.C.), Instituto de Ciências Biológicas, and Laboratório de Farmacocinética de Drogas Antimaláricas, Instituto de Ciências da Saúde (L.W.P.S., A.G.N.C.-M.), Universidade Federal do Pará, Belém, Secretaria de Saúde do Estado do Acre, Cruzeiro do Sul (S.C.N., S.F.), and Grupo Técnico da Malária, Coordenação-Geral de Vigilância de Zoonoses e Doenças de Transmissão Vetorial, Departamento de Imunização e Doenças Transmissíveis, Secretaria de Vigilância em Saúde, Ministério da Saúde (P.B.M.), and Diretoria de Vigilância Epidemiológica, Subsecretaria de Vigilância em Saúde, Secretaria Estadual de Saúde do Distrito Federal (C.R.L.P.), Brasília - all in Brazil; Epidemic Intelligence Service, Center for Surveillance, Epidemiology, and Laboratory Services (S.-B.B.), and the Malaria Branch, Division of Parasitic Diseases and Malaria, Center for Global Health, Centers for Disease Control and Prevention (S.-B.B., A.M.O.) - both in Atlanta; and Instituto de Investigaciones en Ciencias Biomedicas, Universidad Ricardo Palma, Lima, and Instituto de Enfermedades Tropicales, Universidad Nacional Toribio Rodríguez de Mendoza de Amazonas, Chachapoyas (S.M.C.) - both in Peru
| | - Sarah-Blythe Ballard
- From Instituto Evandro Chagas, Ministério da Saúde do Brasil, Ananindeua (N.N.C-.S., S.P.S., G.M.R.V.), Programa de Pós-Graduação em Biologia de Agentes Infecciosos e Parasitários (N.N.C.-S., E.J.M.S., F.P.C., G.M.R.V.) and Laboratório de Genética de Doenças Complexas (E.J.M.S., F.P.C.), Instituto de Ciências Biológicas, and Laboratório de Farmacocinética de Drogas Antimaláricas, Instituto de Ciências da Saúde (L.W.P.S., A.G.N.C.-M.), Universidade Federal do Pará, Belém, Secretaria de Saúde do Estado do Acre, Cruzeiro do Sul (S.C.N., S.F.), and Grupo Técnico da Malária, Coordenação-Geral de Vigilância de Zoonoses e Doenças de Transmissão Vetorial, Departamento de Imunização e Doenças Transmissíveis, Secretaria de Vigilância em Saúde, Ministério da Saúde (P.B.M.), and Diretoria de Vigilância Epidemiológica, Subsecretaria de Vigilância em Saúde, Secretaria Estadual de Saúde do Distrito Federal (C.R.L.P.), Brasília - all in Brazil; Epidemic Intelligence Service, Center for Surveillance, Epidemiology, and Laboratory Services (S.-B.B.), and the Malaria Branch, Division of Parasitic Diseases and Malaria, Center for Global Health, Centers for Disease Control and Prevention (S.-B.B., A.M.O.) - both in Atlanta; and Instituto de Investigaciones en Ciencias Biomedicas, Universidad Ricardo Palma, Lima, and Instituto de Enfermedades Tropicales, Universidad Nacional Toribio Rodríguez de Mendoza de Amazonas, Chachapoyas (S.M.C.) - both in Peru
| | - Sâmela Farias
- From Instituto Evandro Chagas, Ministério da Saúde do Brasil, Ananindeua (N.N.C-.S., S.P.S., G.M.R.V.), Programa de Pós-Graduação em Biologia de Agentes Infecciosos e Parasitários (N.N.C.-S., E.J.M.S., F.P.C., G.M.R.V.) and Laboratório de Genética de Doenças Complexas (E.J.M.S., F.P.C.), Instituto de Ciências Biológicas, and Laboratório de Farmacocinética de Drogas Antimaláricas, Instituto de Ciências da Saúde (L.W.P.S., A.G.N.C.-M.), Universidade Federal do Pará, Belém, Secretaria de Saúde do Estado do Acre, Cruzeiro do Sul (S.C.N., S.F.), and Grupo Técnico da Malária, Coordenação-Geral de Vigilância de Zoonoses e Doenças de Transmissão Vetorial, Departamento de Imunização e Doenças Transmissíveis, Secretaria de Vigilância em Saúde, Ministério da Saúde (P.B.M.), and Diretoria de Vigilância Epidemiológica, Subsecretaria de Vigilância em Saúde, Secretaria Estadual de Saúde do Distrito Federal (C.R.L.P.), Brasília - all in Brazil; Epidemic Intelligence Service, Center for Surveillance, Epidemiology, and Laboratory Services (S.-B.B.), and the Malaria Branch, Division of Parasitic Diseases and Malaria, Center for Global Health, Centers for Disease Control and Prevention (S.-B.B., A.M.O.) - both in Atlanta; and Instituto de Investigaciones en Ciencias Biomedicas, Universidad Ricardo Palma, Lima, and Instituto de Enfermedades Tropicales, Universidad Nacional Toribio Rodríguez de Mendoza de Amazonas, Chachapoyas (S.M.C.) - both in Peru
| | - Sandro P Silva
- From Instituto Evandro Chagas, Ministério da Saúde do Brasil, Ananindeua (N.N.C-.S., S.P.S., G.M.R.V.), Programa de Pós-Graduação em Biologia de Agentes Infecciosos e Parasitários (N.N.C.-S., E.J.M.S., F.P.C., G.M.R.V.) and Laboratório de Genética de Doenças Complexas (E.J.M.S., F.P.C.), Instituto de Ciências Biológicas, and Laboratório de Farmacocinética de Drogas Antimaláricas, Instituto de Ciências da Saúde (L.W.P.S., A.G.N.C.-M.), Universidade Federal do Pará, Belém, Secretaria de Saúde do Estado do Acre, Cruzeiro do Sul (S.C.N., S.F.), and Grupo Técnico da Malária, Coordenação-Geral de Vigilância de Zoonoses e Doenças de Transmissão Vetorial, Departamento de Imunização e Doenças Transmissíveis, Secretaria de Vigilância em Saúde, Ministério da Saúde (P.B.M.), and Diretoria de Vigilância Epidemiológica, Subsecretaria de Vigilância em Saúde, Secretaria Estadual de Saúde do Distrito Federal (C.R.L.P.), Brasília - all in Brazil; Epidemic Intelligence Service, Center for Surveillance, Epidemiology, and Laboratory Services (S.-B.B.), and the Malaria Branch, Division of Parasitic Diseases and Malaria, Center for Global Health, Centers for Disease Control and Prevention (S.-B.B., A.M.O.) - both in Atlanta; and Instituto de Investigaciones en Ciencias Biomedicas, Universidad Ricardo Palma, Lima, and Instituto de Enfermedades Tropicales, Universidad Nacional Toribio Rodríguez de Mendoza de Amazonas, Chachapoyas (S.M.C.) - both in Peru
| | - Stella M Chenet
- From Instituto Evandro Chagas, Ministério da Saúde do Brasil, Ananindeua (N.N.C-.S., S.P.S., G.M.R.V.), Programa de Pós-Graduação em Biologia de Agentes Infecciosos e Parasitários (N.N.C.-S., E.J.M.S., F.P.C., G.M.R.V.) and Laboratório de Genética de Doenças Complexas (E.J.M.S., F.P.C.), Instituto de Ciências Biológicas, and Laboratório de Farmacocinética de Drogas Antimaláricas, Instituto de Ciências da Saúde (L.W.P.S., A.G.N.C.-M.), Universidade Federal do Pará, Belém, Secretaria de Saúde do Estado do Acre, Cruzeiro do Sul (S.C.N., S.F.), and Grupo Técnico da Malária, Coordenação-Geral de Vigilância de Zoonoses e Doenças de Transmissão Vetorial, Departamento de Imunização e Doenças Transmissíveis, Secretaria de Vigilância em Saúde, Ministério da Saúde (P.B.M.), and Diretoria de Vigilância Epidemiológica, Subsecretaria de Vigilância em Saúde, Secretaria Estadual de Saúde do Distrito Federal (C.R.L.P.), Brasília - all in Brazil; Epidemic Intelligence Service, Center for Surveillance, Epidemiology, and Laboratory Services (S.-B.B.), and the Malaria Branch, Division of Parasitic Diseases and Malaria, Center for Global Health, Centers for Disease Control and Prevention (S.-B.B., A.M.O.) - both in Atlanta; and Instituto de Investigaciones en Ciencias Biomedicas, Universidad Ricardo Palma, Lima, and Instituto de Enfermedades Tropicales, Universidad Nacional Toribio Rodríguez de Mendoza de Amazonas, Chachapoyas (S.M.C.) - both in Peru
| | - Eduardo J M Santos
- From Instituto Evandro Chagas, Ministério da Saúde do Brasil, Ananindeua (N.N.C-.S., S.P.S., G.M.R.V.), Programa de Pós-Graduação em Biologia de Agentes Infecciosos e Parasitários (N.N.C.-S., E.J.M.S., F.P.C., G.M.R.V.) and Laboratório de Genética de Doenças Complexas (E.J.M.S., F.P.C.), Instituto de Ciências Biológicas, and Laboratório de Farmacocinética de Drogas Antimaláricas, Instituto de Ciências da Saúde (L.W.P.S., A.G.N.C.-M.), Universidade Federal do Pará, Belém, Secretaria de Saúde do Estado do Acre, Cruzeiro do Sul (S.C.N., S.F.), and Grupo Técnico da Malária, Coordenação-Geral de Vigilância de Zoonoses e Doenças de Transmissão Vetorial, Departamento de Imunização e Doenças Transmissíveis, Secretaria de Vigilância em Saúde, Ministério da Saúde (P.B.M.), and Diretoria de Vigilância Epidemiológica, Subsecretaria de Vigilância em Saúde, Secretaria Estadual de Saúde do Distrito Federal (C.R.L.P.), Brasília - all in Brazil; Epidemic Intelligence Service, Center for Surveillance, Epidemiology, and Laboratory Services (S.-B.B.), and the Malaria Branch, Division of Parasitic Diseases and Malaria, Center for Global Health, Centers for Disease Control and Prevention (S.-B.B., A.M.O.) - both in Atlanta; and Instituto de Investigaciones en Ciencias Biomedicas, Universidad Ricardo Palma, Lima, and Instituto de Enfermedades Tropicales, Universidad Nacional Toribio Rodríguez de Mendoza de Amazonas, Chachapoyas (S.M.C.) - both in Peru
| | - Luann W Pereira de Sena
- From Instituto Evandro Chagas, Ministério da Saúde do Brasil, Ananindeua (N.N.C-.S., S.P.S., G.M.R.V.), Programa de Pós-Graduação em Biologia de Agentes Infecciosos e Parasitários (N.N.C.-S., E.J.M.S., F.P.C., G.M.R.V.) and Laboratório de Genética de Doenças Complexas (E.J.M.S., F.P.C.), Instituto de Ciências Biológicas, and Laboratório de Farmacocinética de Drogas Antimaláricas, Instituto de Ciências da Saúde (L.W.P.S., A.G.N.C.-M.), Universidade Federal do Pará, Belém, Secretaria de Saúde do Estado do Acre, Cruzeiro do Sul (S.C.N., S.F.), and Grupo Técnico da Malária, Coordenação-Geral de Vigilância de Zoonoses e Doenças de Transmissão Vetorial, Departamento de Imunização e Doenças Transmissíveis, Secretaria de Vigilância em Saúde, Ministério da Saúde (P.B.M.), and Diretoria de Vigilância Epidemiológica, Subsecretaria de Vigilância em Saúde, Secretaria Estadual de Saúde do Distrito Federal (C.R.L.P.), Brasília - all in Brazil; Epidemic Intelligence Service, Center for Surveillance, Epidemiology, and Laboratory Services (S.-B.B.), and the Malaria Branch, Division of Parasitic Diseases and Malaria, Center for Global Health, Centers for Disease Control and Prevention (S.-B.B., A.M.O.) - both in Atlanta; and Instituto de Investigaciones en Ciencias Biomedicas, Universidad Ricardo Palma, Lima, and Instituto de Enfermedades Tropicales, Universidad Nacional Toribio Rodríguez de Mendoza de Amazonas, Chachapoyas (S.M.C.) - both in Peru
| | - Flávia Póvoa da Costa
- From Instituto Evandro Chagas, Ministério da Saúde do Brasil, Ananindeua (N.N.C-.S., S.P.S., G.M.R.V.), Programa de Pós-Graduação em Biologia de Agentes Infecciosos e Parasitários (N.N.C.-S., E.J.M.S., F.P.C., G.M.R.V.) and Laboratório de Genética de Doenças Complexas (E.J.M.S., F.P.C.), Instituto de Ciências Biológicas, and Laboratório de Farmacocinética de Drogas Antimaláricas, Instituto de Ciências da Saúde (L.W.P.S., A.G.N.C.-M.), Universidade Federal do Pará, Belém, Secretaria de Saúde do Estado do Acre, Cruzeiro do Sul (S.C.N., S.F.), and Grupo Técnico da Malária, Coordenação-Geral de Vigilância de Zoonoses e Doenças de Transmissão Vetorial, Departamento de Imunização e Doenças Transmissíveis, Secretaria de Vigilância em Saúde, Ministério da Saúde (P.B.M.), and Diretoria de Vigilância Epidemiológica, Subsecretaria de Vigilância em Saúde, Secretaria Estadual de Saúde do Distrito Federal (C.R.L.P.), Brasília - all in Brazil; Epidemic Intelligence Service, Center for Surveillance, Epidemiology, and Laboratory Services (S.-B.B.), and the Malaria Branch, Division of Parasitic Diseases and Malaria, Center for Global Health, Centers for Disease Control and Prevention (S.-B.B., A.M.O.) - both in Atlanta; and Instituto de Investigaciones en Ciencias Biomedicas, Universidad Ricardo Palma, Lima, and Instituto de Enfermedades Tropicales, Universidad Nacional Toribio Rodríguez de Mendoza de Amazonas, Chachapoyas (S.M.C.) - both in Peru
| | - Amanda G N Cardoso-Mello
- From Instituto Evandro Chagas, Ministério da Saúde do Brasil, Ananindeua (N.N.C-.S., S.P.S., G.M.R.V.), Programa de Pós-Graduação em Biologia de Agentes Infecciosos e Parasitários (N.N.C.-S., E.J.M.S., F.P.C., G.M.R.V.) and Laboratório de Genética de Doenças Complexas (E.J.M.S., F.P.C.), Instituto de Ciências Biológicas, and Laboratório de Farmacocinética de Drogas Antimaláricas, Instituto de Ciências da Saúde (L.W.P.S., A.G.N.C.-M.), Universidade Federal do Pará, Belém, Secretaria de Saúde do Estado do Acre, Cruzeiro do Sul (S.C.N., S.F.), and Grupo Técnico da Malária, Coordenação-Geral de Vigilância de Zoonoses e Doenças de Transmissão Vetorial, Departamento de Imunização e Doenças Transmissíveis, Secretaria de Vigilância em Saúde, Ministério da Saúde (P.B.M.), and Diretoria de Vigilância Epidemiológica, Subsecretaria de Vigilância em Saúde, Secretaria Estadual de Saúde do Distrito Federal (C.R.L.P.), Brasília - all in Brazil; Epidemic Intelligence Service, Center for Surveillance, Epidemiology, and Laboratory Services (S.-B.B.), and the Malaria Branch, Division of Parasitic Diseases and Malaria, Center for Global Health, Centers for Disease Control and Prevention (S.-B.B., A.M.O.) - both in Atlanta; and Instituto de Investigaciones en Ciencias Biomedicas, Universidad Ricardo Palma, Lima, and Instituto de Enfermedades Tropicales, Universidad Nacional Toribio Rodríguez de Mendoza de Amazonas, Chachapoyas (S.M.C.) - both in Peru
| | - Paola B Marchesini
- From Instituto Evandro Chagas, Ministério da Saúde do Brasil, Ananindeua (N.N.C-.S., S.P.S., G.M.R.V.), Programa de Pós-Graduação em Biologia de Agentes Infecciosos e Parasitários (N.N.C.-S., E.J.M.S., F.P.C., G.M.R.V.) and Laboratório de Genética de Doenças Complexas (E.J.M.S., F.P.C.), Instituto de Ciências Biológicas, and Laboratório de Farmacocinética de Drogas Antimaláricas, Instituto de Ciências da Saúde (L.W.P.S., A.G.N.C.-M.), Universidade Federal do Pará, Belém, Secretaria de Saúde do Estado do Acre, Cruzeiro do Sul (S.C.N., S.F.), and Grupo Técnico da Malária, Coordenação-Geral de Vigilância de Zoonoses e Doenças de Transmissão Vetorial, Departamento de Imunização e Doenças Transmissíveis, Secretaria de Vigilância em Saúde, Ministério da Saúde (P.B.M.), and Diretoria de Vigilância Epidemiológica, Subsecretaria de Vigilância em Saúde, Secretaria Estadual de Saúde do Distrito Federal (C.R.L.P.), Brasília - all in Brazil; Epidemic Intelligence Service, Center for Surveillance, Epidemiology, and Laboratory Services (S.-B.B.), and the Malaria Branch, Division of Parasitic Diseases and Malaria, Center for Global Health, Centers for Disease Control and Prevention (S.-B.B., A.M.O.) - both in Atlanta; and Instituto de Investigaciones en Ciencias Biomedicas, Universidad Ricardo Palma, Lima, and Instituto de Enfermedades Tropicales, Universidad Nacional Toribio Rodríguez de Mendoza de Amazonas, Chachapoyas (S.M.C.) - both in Peru
| | - Cássio R L Peterka
- From Instituto Evandro Chagas, Ministério da Saúde do Brasil, Ananindeua (N.N.C-.S., S.P.S., G.M.R.V.), Programa de Pós-Graduação em Biologia de Agentes Infecciosos e Parasitários (N.N.C.-S., E.J.M.S., F.P.C., G.M.R.V.) and Laboratório de Genética de Doenças Complexas (E.J.M.S., F.P.C.), Instituto de Ciências Biológicas, and Laboratório de Farmacocinética de Drogas Antimaláricas, Instituto de Ciências da Saúde (L.W.P.S., A.G.N.C.-M.), Universidade Federal do Pará, Belém, Secretaria de Saúde do Estado do Acre, Cruzeiro do Sul (S.C.N., S.F.), and Grupo Técnico da Malária, Coordenação-Geral de Vigilância de Zoonoses e Doenças de Transmissão Vetorial, Departamento de Imunização e Doenças Transmissíveis, Secretaria de Vigilância em Saúde, Ministério da Saúde (P.B.M.), and Diretoria de Vigilância Epidemiológica, Subsecretaria de Vigilância em Saúde, Secretaria Estadual de Saúde do Distrito Federal (C.R.L.P.), Brasília - all in Brazil; Epidemic Intelligence Service, Center for Surveillance, Epidemiology, and Laboratory Services (S.-B.B.), and the Malaria Branch, Division of Parasitic Diseases and Malaria, Center for Global Health, Centers for Disease Control and Prevention (S.-B.B., A.M.O.) - both in Atlanta; and Instituto de Investigaciones en Ciencias Biomedicas, Universidad Ricardo Palma, Lima, and Instituto de Enfermedades Tropicales, Universidad Nacional Toribio Rodríguez de Mendoza de Amazonas, Chachapoyas (S.M.C.) - both in Peru
| | - Giselle M R Viana
- From Instituto Evandro Chagas, Ministério da Saúde do Brasil, Ananindeua (N.N.C-.S., S.P.S., G.M.R.V.), Programa de Pós-Graduação em Biologia de Agentes Infecciosos e Parasitários (N.N.C.-S., E.J.M.S., F.P.C., G.M.R.V.) and Laboratório de Genética de Doenças Complexas (E.J.M.S., F.P.C.), Instituto de Ciências Biológicas, and Laboratório de Farmacocinética de Drogas Antimaláricas, Instituto de Ciências da Saúde (L.W.P.S., A.G.N.C.-M.), Universidade Federal do Pará, Belém, Secretaria de Saúde do Estado do Acre, Cruzeiro do Sul (S.C.N., S.F.), and Grupo Técnico da Malária, Coordenação-Geral de Vigilância de Zoonoses e Doenças de Transmissão Vetorial, Departamento de Imunização e Doenças Transmissíveis, Secretaria de Vigilância em Saúde, Ministério da Saúde (P.B.M.), and Diretoria de Vigilância Epidemiológica, Subsecretaria de Vigilância em Saúde, Secretaria Estadual de Saúde do Distrito Federal (C.R.L.P.), Brasília - all in Brazil; Epidemic Intelligence Service, Center for Surveillance, Epidemiology, and Laboratory Services (S.-B.B.), and the Malaria Branch, Division of Parasitic Diseases and Malaria, Center for Global Health, Centers for Disease Control and Prevention (S.-B.B., A.M.O.) - both in Atlanta; and Instituto de Investigaciones en Ciencias Biomedicas, Universidad Ricardo Palma, Lima, and Instituto de Enfermedades Tropicales, Universidad Nacional Toribio Rodríguez de Mendoza de Amazonas, Chachapoyas (S.M.C.) - both in Peru
| | - Alexandre Macedo de Oliveira
- From Instituto Evandro Chagas, Ministério da Saúde do Brasil, Ananindeua (N.N.C-.S., S.P.S., G.M.R.V.), Programa de Pós-Graduação em Biologia de Agentes Infecciosos e Parasitários (N.N.C.-S., E.J.M.S., F.P.C., G.M.R.V.) and Laboratório de Genética de Doenças Complexas (E.J.M.S., F.P.C.), Instituto de Ciências Biológicas, and Laboratório de Farmacocinética de Drogas Antimaláricas, Instituto de Ciências da Saúde (L.W.P.S., A.G.N.C.-M.), Universidade Federal do Pará, Belém, Secretaria de Saúde do Estado do Acre, Cruzeiro do Sul (S.C.N., S.F.), and Grupo Técnico da Malária, Coordenação-Geral de Vigilância de Zoonoses e Doenças de Transmissão Vetorial, Departamento de Imunização e Doenças Transmissíveis, Secretaria de Vigilância em Saúde, Ministério da Saúde (P.B.M.), and Diretoria de Vigilância Epidemiológica, Subsecretaria de Vigilância em Saúde, Secretaria Estadual de Saúde do Distrito Federal (C.R.L.P.), Brasília - all in Brazil; Epidemic Intelligence Service, Center for Surveillance, Epidemiology, and Laboratory Services (S.-B.B.), and the Malaria Branch, Division of Parasitic Diseases and Malaria, Center for Global Health, Centers for Disease Control and Prevention (S.-B.B., A.M.O.) - both in Atlanta; and Instituto de Investigaciones en Ciencias Biomedicas, Universidad Ricardo Palma, Lima, and Instituto de Enfermedades Tropicales, Universidad Nacional Toribio Rodríguez de Mendoza de Amazonas, Chachapoyas (S.M.C.) - both in Peru
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Khammanee T, Sawangjaroen N, Buncherd H, Tun AW, Thanapongpichat S. Prevalence of Glucose-6-Phosphate Dehydrogenase (G6PD) Deficiency among Malaria Patients in Southern Thailand: 8 Years Retrospective Study. THE KOREAN JOURNAL OF PARASITOLOGY 2022; 60:15-23. [PMID: 35247950 PMCID: PMC8898650 DOI: 10.3347/kjp.2022.60.1.15] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/27/2021] [Accepted: 12/22/2021] [Indexed: 11/23/2022]
Abstract
Erythrocytes deficient in glucose-6-phosphate dehydrogenase (G6PD) is more susceptible to oxidative damage from free radical derived compounds. The hemolysis triggered by oxidative agents such as primaquine (PQ) is used for the radical treatment of hypnozoites of P. vivax. Testing of G6PD screening before malaria treatment is not a common practice in Thailand, which poses patients at risk of hemolysis. This retrospective study aimed to investigate the prevalence of G6PD in malaria patients who live in Southern Thailand. Eight hundred eighty-one malaria patients were collected for 8-year from 2012 to 2019, including 785 (89.1%) of P. vivax, 61 (6.9%) of P. falciparum, 27 (3.1%) of P. knowlesi, and 8 (0.9%) of mixed infections. The DiaPlexC genotyping kit (Asian type) and PCR-RFLP were employed to determine the G6PD variants. The result showed that 5 different types of G6PD variants were identified in 26 cases (2.9%); 12/26 (46.2%) had Mahidol (487G>A) and 11/26 (42.3%) had Viangchan (871G>A) variants, while the rest had Kaiping (1388G>A), Union (1360C>T), and Mediterranean (563C>T) variants. G6PD Songklanagarind (196T>A) variant was not found in the study. Our result did not show a significant difference in the malaria parasite densities in patients between G6PD-deficient and G6PD-normal groups. According to our findings, testing G6PD deficiency and monitoring the potential PQ toxicity in patients who receive PQ are highly recommended.
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Affiliation(s)
- Thunchanok Khammanee
- Division of Biological Science, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla 90110, Thailand
| | - Nongyao Sawangjaroen
- Division of Biological Science, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla 90110, Thailand
| | - Hansuk Buncherd
- Faculty of Medical Technology, Prince of Songkla University, Hat Yai, Songkhla 90110, Thailand
| | - Aung Win Tun
- Faculty of Graduate Studies, Mahidol University, Salaya, Nakhon Pathom 73170, Thailand
| | - Supinya Thanapongpichat
- Faculty of Medical Technology, Prince of Songkla University, Hat Yai, Songkhla 90110, Thailand
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26
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Genzen JR, Nwosu A, Long T, Murphy H, Alter DN. An International Survey of Glucose-6-Phosphate Dehydrogenase Laboratory Reporting Practices. Arch Pathol Lab Med 2022; 146:477172. [PMID: 35090003 DOI: 10.5858/arpa.2021-0276-cp] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/20/2021] [Indexed: 02/21/2024]
Abstract
CONTEXT.— Glucose-6-phosphate dehydrogenase (G6PD) activity is used in the evaluation of hemolysis risk in patients being assessed for G6PD deficiency. A long-acting 8-aminoquinoline drug (tafenoquine) used in malaria treatment is contraindicated in patients with G6PD deficiency (<70% normal G6PD activity). The current state of G6PD reporting practices to support clinical eligibility assessment is poorly understood. OBJECTIVE.— To assess clinical laboratory reporting practices for G6PD testing. DESIGN.— In October 2019 and October 2020, voluntary questionnaires were distributed to 327 and 324 laboratories participating in the College of American Pathologists G6PD proficiency testing (PT). RESULTS.— Two hundred fifty-seven and 119 laboratories responded to the 2019 and 2020 questionnaires, respectively. Few laboratories have received clinical questions about average normal G6PD activity (US/Canada, 2.0% [3 of 149]; international, 8.4% [9 of 107]), whereas slightly more have determined the average normal G6PD activity for their own assay and patient populations (US/Canada, 6.7% [10 of 149]; international, 19.4% [21 of 108]). Few laboratories report G6PD activity in percent of normal format (US/Canada, 2.7% [4 of 149]; international, 8.3% [9 of 108]). The most common unit of measurement in use for quantitative G6PD reporting is unit per gram of hemoglobin. Reference intervals vary based on assay, reaction temperature, and participant laboratory and demonstrate moderate correlation (r = .46-.51) to G6PD activity measured from a "normal" PT challenge specimen. Nearly half of participants (47.8% [85 of 178]) categorized a quantitatively "intermediate" G6PD PT challenge as "normal" when using qualitative assays. CONCLUSIONS.— Percent of normal G6PD activity reporting would facilitate patient eligibility assessment for drugs, such as tafenoquine. Quantitative assays are better able to differentiate "intermediate" specimens than qualitative assays.
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Affiliation(s)
- Jonathan R Genzen
- From the Department of Pathology, University of Utah, Salt Lake City, Utah (Genzen)
- ARUP Laboratories, Salt Lake City, Utah (Genzen)
| | - Ann Nwosu
- The Division of Biostatistics (Nwosu, Long), College of American Pathologists, Northfield, Illinois
| | - Thomas Long
- The Division of Biostatistics (Nwosu, Long), College of American Pathologists, Northfield, Illinois
| | - Hilda Murphy
- Proficiency Testing (Murphy), College of American Pathologists, Northfield, Illinois
| | - David N Alter
- The Department of Pathology and Laboratory Medicine, Emory University School of Medicine, Atlanta, Georgia (Alter)
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Watson JA, Commons RJ, Tarning J, Simpson JA, Llanos Cuentas A, Lacerda MVG, Green JA, Koh GCKW, Chu CS, Nosten FH, Price RN, Day NPJ, White NJ. The clinical pharmacology of tafenoquine in the radical cure of Plasmodium vivax malaria: An individual patient data meta-analysis. eLife 2022; 11:83433. [PMID: 36472067 PMCID: PMC9725750 DOI: 10.7554/elife.83433] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Accepted: 11/21/2022] [Indexed: 12/12/2022] Open
Abstract
Tafenoquine is a newly licensed antimalarial drug for the radical cure of Plasmodium vivax malaria. The mechanism of action and optimal dosing are uncertain. We pooled individual data from 1102 patients and 72 healthy volunteers studied in the pre-registration trials. We show that tafenoquine dose is the primary determinant of efficacy. Under an Emax model, we estimate the currently recommended 300 mg dose in a 60 kg adult (5 mg/kg) results in 70% of the maximal obtainable hypnozoiticidal effect. Increasing the dose to 7.5 mg/kg (i.e. 450 mg) would result in 90% reduction in the risk of P. vivax recurrence. After adjustment for dose, the tafenoquine terminal elimination half-life, and day 7 methaemoglobin concentration, but not the parent compound exposure, were also associated with recurrence. These results suggest that the production of oxidative metabolites is central to tafenoquine's hypnozoiticidal efficacy. Clinical trials of higher tafenoquine doses are needed to characterise their efficacy, safety and tolerability.
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Affiliation(s)
- James A Watson
- Oxford University Clinical Research Unit, Hospital for Tropical DiseasesHo Chi Minh CityViet Nam,Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of OxfordOxfordUnited Kingdom,WorldWide Antimalarial Resistance NetworkOxfordUnited Kingdom
| | - Robert J Commons
- WorldWide Antimalarial Resistance NetworkOxfordUnited Kingdom,Global Health Division, Menzies School of Health Research, Charles Darwin UniversityDarwinAustralia
| | - Joel Tarning
- Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of OxfordOxfordUnited Kingdom,Mahidol Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol UniversityBangkokThailand
| | - Julie A Simpson
- Centre for Epidemiology and Biostatistics, Melbourne School of Population and Global Health, University of MelbourneMelbourneAustralia
| | - Alejandro Llanos Cuentas
- Unit of Leishmaniasis and Malaria, Instituto de Medicina Tropical “Alexander von Humboldt”, Universidad Peruana Cayetano HerediaLimaPeru
| | | | - Justin A Green
- Formerly Senior Director, Global Health, GlaxoSmithKlineBrentfordUnited Kingdom
| | - Gavin CKW Koh
- Department of Infectious Diseases, Northwick Park HospitalHarrowUnited Kingdom
| | - Cindy S Chu
- Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of OxfordOxfordUnited Kingdom,Shoklo Malaria Research Unit, Mahidol–Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol UniversityMae SotThailand
| | - François H Nosten
- Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of OxfordOxfordUnited Kingdom,Shoklo Malaria Research Unit, Mahidol–Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol UniversityMae SotThailand
| | - Richard N Price
- Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of OxfordOxfordUnited Kingdom,WorldWide Antimalarial Resistance NetworkOxfordUnited Kingdom,Global Health Division, Menzies School of Health Research, Charles Darwin UniversityDarwinAustralia
| | - Nicholas PJ Day
- Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of OxfordOxfordUnited Kingdom,Mahidol Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol UniversityBangkokThailand
| | - Nicholas J White
- Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of OxfordOxfordUnited Kingdom,Mahidol Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol UniversityBangkokThailand
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28
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Combined effects of double mutations on catalytic activity and structural stability contribute to clinical manifestations of glucose-6-phosphate dehydrogenase deficiency. Sci Rep 2021; 11:24307. [PMID: 34934109 PMCID: PMC8692357 DOI: 10.1038/s41598-021-03800-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2021] [Accepted: 12/10/2021] [Indexed: 11/08/2022] Open
Abstract
Glucose-6-phosphate dehydrogenase (G6PD) deficiency is the most common enzymopathy in humans, affecting ~ 500 million worldwide. A detailed study of the structural stability and catalytic activity of G6PD variants is required to understand how different mutations cause varying degrees of enzyme deficiency, reflecting the response of G6PD variants to oxidative stress. Furthermore, for G6PD double variants, investigating how two mutations jointly cause severe enzyme deficiency is important. Here, we characterized the functional and structural properties of nine G6PD variants: G6PD Gaohe, G6PD Mahidol, G6PD Shoklo, G6PD Canton, G6PD Kaiping, G6PD Gaohe + Kaiping, G6PD Mahidol + Canton, G6PD Mahidol + Kaiping and G6PD Canton + Kaiping. All variants were less catalytically active and structurally stable than the wild type enzyme, with G6PD double mutations having a greater impact than single mutations. G6PD Shoklo and G6PD Canton + Kaiping were the least catalytically active single and double variants, respectively. The combined effects of two mutations were observed, with the Canton mutation reducing structural stability and the Kaiping mutation increasing it in the double mutations. Severe enzyme deficiency in the double mutants was mainly determined by the trade-off between protein stability and catalytic activity. Additionally, it was demonstrated that AG1, a G6PD activator, only marginally increased G6PD enzymatic activity and stability.
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Dynamics of G6PD activity in patients receiving weekly primaquine for therapy of Plasmodium vivax malaria. PLoS Negl Trop Dis 2021; 15:e0009690. [PMID: 34495956 PMCID: PMC8452019 DOI: 10.1371/journal.pntd.0009690] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Revised: 09/20/2021] [Accepted: 07/28/2021] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Acute Plasmodium vivax malaria is associated with haemolysis, bone marrow suppression, reticulocytopenia, and post-treatment reticulocytosis leading to haemoglobin recovery. Little is known how malaria affects glucose-6-phosphate dehydrogenase (G6PD) activity and whether changes in activity when patients present may lead qualitative tests, like the fluorescent spot test (FST), to misdiagnose G6PD deficient (G6PDd) patients as G6PD normal (G6PDn). Giving primaquine or tafenoquine to such patients could result in severe haemolysis. METHODS We investigated the G6PD genotype, G6PD enzyme activity over time and the baseline FST phenotype in Cambodians with acute P. vivax malaria treated with 3-day dihydroartemisinin piperaquine and weekly primaquine, 0·75 mg/kg x8 doses. RESULTS Of 75 recruited patients (males 63), aged 5-63 years (median 24), 15 were G6PDd males (14 Viangchan, 1 Canton), 3 were G6PD Viangchan heterozygous females, and 57 were G6PDn; 6 patients had α/β-thalassaemia and 26 had HbE. Median (range) Day0 G6PD activities were 0·85 U/g Hb (0·10-1·36) and 11·4 U/g Hb (6·67-16·78) in G6PDd and G6PDn patients, respectively, rising significantly to 1·45 (0·36-5·54, p<0.01) and 12·0 (8·1-17·4, p = 0.04) U/g Hb on Day7, then falling to ~Day0 values by Day56. Day0 G6PD activity did not correlate (p = 0.28) with the Day0 reticulocyte counts but both correlated over time. The FST diagnosed correctly 17/18 G6PDd patients, misclassifying one heterozygous female as G6PDn. CONCLUSIONS In Cambodia, acute P. vivax malaria did not elevate G6PD activities in our small sample of G6PDd patients to levels that would result in a false normal qualitative test. Low G6PDd enzyme activity at disease presentation increases upon parasite clearance, parallel to reticulocytosis. More work is needed in G6PDd heterozygous females to ascertain the effect of P. vivax on their G6PD activities. TRIAL REGISTRATION The trial was registered (ACTRN12613000003774) with the Australia New Zealand Clinical trials (https://www.anzctr.org.au/Trial/Registration/TrialReview.aspx?id=363399&isReview=true).
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Renard I, Ben Mamoun C. Treatment of Human Babesiosis: Then and Now. Pathogens 2021; 10:pathogens10091120. [PMID: 34578153 PMCID: PMC8469882 DOI: 10.3390/pathogens10091120] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Revised: 08/23/2021] [Accepted: 08/27/2021] [Indexed: 12/26/2022] Open
Abstract
Babesiosis is an emerging tick-borne disease caused by apicomplexan parasites of the genus Babesia. With its increasing incidence worldwide and the risk of human-to-human transmission through blood transfusion, babesiosis is becoming a rising public health concern. The current arsenal for the treatment of human babesiosis is limited and consists of combinations of atovaquone and azithromycin or clindamycin and quinine. These combination therapies were not designed based on biological criteria unique to Babesia parasites, but were rather repurposed based on their well-established efficacy against other apicomplexan parasites. However, these compounds are associated with mild or severe adverse events and a rapid emergence of drug resistance, thus highlighting the need for new therapeutic strategies that are specifically tailored to Babesia parasites. Herein, we review ongoing babesiosis therapeutic and management strategies and their limitations, and further review current efforts to develop new, effective, and safer therapies for the treatment of this disease.
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de Pina-Costa A, Silvino ACR, Dos Santos EM, Pedro RS, Moreira J, Umana GL, da Silva ADT, da Rosa Santos OHL, de Deus Henriques KM, Daniel-Ribeiro CT, Brasil P, Sousa TN, Siqueira AM. Increased primaquine total dose prevents Plasmodium vivax relapses in patients with impaired CYP2D6 activity: report of three cases. Malar J 2021; 20:341. [PMID: 34391426 PMCID: PMC8364036 DOI: 10.1186/s12936-021-03869-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2021] [Accepted: 07/28/2021] [Indexed: 11/25/2022] Open
Abstract
Background The relapsing nature of Plasmodium vivax infection is a major barrier to its control and elimination. Factors such as adequate dosing, adherence, drug quality, and pharmacogenetics can impact the effectiveness of radical cure of P. vivax and need to be adequately evaluated. CYP2D6 pathway mediates the activation of primaquine (primaquine) into an active metabolite(s) in hepatocytes, and impaired activity has been linked to a higher risk of relapse. Cases presentation Three patients diagnosed with P. vivax malaria presented repeated relapses after being initially treated with chloroquine (25 mg/kg) and primaquine (3.5 mg/kg in 14 days) at a non-endemic travel clinic. Recurring episodes were subsequently treated with a higher dose of primaquine (7 mg/kg in 14 days), which prevented further relapses in two patients. However, one patient still presented two episodes after a higher primaquine dose and was prescribed 300 mg of chloroquine weekly to prevent further episodes. Impaired CYP2D6 function was observed in all of them. Conclusion Lack of response to primaquine was associated with impaired CYP2D6 activity in three patients presenting multiple relapses followed in a non-endemic setting. Higher primaquine dosage was safe and effectively prevented relapses in two patients and should be further investigated as an option in Latin America. It is crucial to investigate the factors associated with unsuccessful radical cures and alternative therapeutic options.
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Affiliation(s)
- Anielle de Pina-Costa
- Laboratório de Pesquisa Clínica em Doenças Febris Agudas-Instituto Nacional de Infectologia (INI) Evandro Chagas, Fundação Oswaldo Cruz (Fiocruz), Rio de Janeiro, RJ, Brazil.,Centro de Pesquisa Diagnóstico e Treinamento em Malária-Fiocruz, Rio de Janeiro, Brazil.,Centro Universitário Serra Dos Órgãos (UNIFESO), Teresópolis, RJ, Brazil
| | | | - Edwiges Motta Dos Santos
- Laboratório de Pesquisa Clínica em Doenças Febris Agudas-Instituto Nacional de Infectologia (INI) Evandro Chagas, Fundação Oswaldo Cruz (Fiocruz), Rio de Janeiro, RJ, Brazil
| | - Renata Saraiva Pedro
- Laboratório de Pesquisa Clínica em Doenças Febris Agudas-Instituto Nacional de Infectologia (INI) Evandro Chagas, Fundação Oswaldo Cruz (Fiocruz), Rio de Janeiro, RJ, Brazil.,Assessoria Clínica-Instituto em Tecnologia em Imunobiológicos-Fiocruz, Rio de Janeiro, Brazil
| | - José Moreira
- Laboratório de Pesquisa Clínica em Doenças Febris Agudas-Instituto Nacional de Infectologia (INI) Evandro Chagas, Fundação Oswaldo Cruz (Fiocruz), Rio de Janeiro, RJ, Brazil.,Programa de Pós-Graduação Em Pesquisa Clínica, INI Evandro Chagas, Fiocruz, Rio de Janeiro, Brazil
| | - Gabriela Liseth Umana
- Laboratório de Pesquisa Clínica em Doenças Febris Agudas-Instituto Nacional de Infectologia (INI) Evandro Chagas, Fundação Oswaldo Cruz (Fiocruz), Rio de Janeiro, RJ, Brazil
| | - Ana Danielle Tavares da Silva
- Laboratório de Pesquisa Clínica em Doenças Febris Agudas-Instituto Nacional de Infectologia (INI) Evandro Chagas, Fundação Oswaldo Cruz (Fiocruz), Rio de Janeiro, RJ, Brazil
| | - Otília Helena Lupi da Rosa Santos
- Laboratório de Pesquisa Clínica em Doenças Febris Agudas-Instituto Nacional de Infectologia (INI) Evandro Chagas, Fundação Oswaldo Cruz (Fiocruz), Rio de Janeiro, RJ, Brazil.,Centro de Pesquisa Diagnóstico e Treinamento em Malária-Fiocruz, Rio de Janeiro, Brazil
| | - Karina Medeiros de Deus Henriques
- Laboratório de Pesquisa Clínica em Doenças Febris Agudas-Instituto Nacional de Infectologia (INI) Evandro Chagas, Fundação Oswaldo Cruz (Fiocruz), Rio de Janeiro, RJ, Brazil.,Programa de Pós-Graduação Em Pesquisa Clínica, INI Evandro Chagas, Fiocruz, Rio de Janeiro, Brazil
| | - Cláudio Tadeu Daniel-Ribeiro
- Centro de Pesquisa Diagnóstico e Treinamento em Malária-Fiocruz, Rio de Janeiro, Brazil.,Laboratório de Pesquisa Em Malária, Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro, RJ, Brazil
| | - Patrícia Brasil
- Laboratório de Pesquisa Clínica em Doenças Febris Agudas-Instituto Nacional de Infectologia (INI) Evandro Chagas, Fundação Oswaldo Cruz (Fiocruz), Rio de Janeiro, RJ, Brazil.,Centro de Pesquisa Diagnóstico e Treinamento em Malária-Fiocruz, Rio de Janeiro, Brazil.,Programa de Pós-Graduação Em Pesquisa Clínica, INI Evandro Chagas, Fiocruz, Rio de Janeiro, Brazil
| | | | - André M Siqueira
- Laboratório de Pesquisa Clínica em Doenças Febris Agudas-Instituto Nacional de Infectologia (INI) Evandro Chagas, Fundação Oswaldo Cruz (Fiocruz), Rio de Janeiro, RJ, Brazil. .,Centro de Pesquisa Diagnóstico e Treinamento em Malária-Fiocruz, Rio de Janeiro, Brazil. .,Programa de Pós-Graduação Em Pesquisa Clínica, INI Evandro Chagas, Fiocruz, Rio de Janeiro, Brazil.
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Satyagraha AW, Sadhewa A, Panggalo LV, Subekti D, Elyazar I, Soebianto S, Mahpud N, Harahap AR, Baird JK. Genotypes and phenotypes of G6PD deficiency among Indonesian females across diagnostic thresholds of G6PD activity guiding safe primaquine therapy of latent malaria. PLoS Negl Trop Dis 2021; 15:e0009610. [PMID: 34270547 PMCID: PMC8318249 DOI: 10.1371/journal.pntd.0009610] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2021] [Revised: 07/28/2021] [Accepted: 06/30/2021] [Indexed: 02/03/2023] Open
Abstract
BACKGROUND Plasmodium vivax occurs as a latent infection of liver and a patent infection of red blood cells. Radical cure requires both blood schizontocidal and hypnozoitocidal chemotherapies. The hypnozoitocidal therapies available are primaquine and tafenoquine, 8-aminoquinoline drugs that can provoke threatening acute hemolytic anemia in patients having an X-linked G6PD-deficiency. Heterozygous females may screen as G6PD-normal prior to radical cure and go on to experience hemolytic crisis. METHODS & FINDINGS This study examined G6PD phenotypes in 1928 female subjects living in malarious Sumba Island in eastern Indonesia to ascertain the prevalence of females vulnerable to diagnostic misclassification as G6PD-normal. All 367 (19%) females having <80% G6PD normal activity were genotyped. Among those, 103 (28%) were G6PD wild type, 251 (68·4%) were heterozygous, three (0·8%) were compound heterozygotes, and ten (2·7%) were homozygous deficient. The variants Vanua Lava, Viangchan, Coimbra, Chatham, and Kaiping occurred among them. Below the 70% of normal G6PD activity threshold, just 18 (8%) were G6PD-normal and 214 (92%) were G6PD-deficient. Among the 31 females with <30% G6PD normal activity were all ten homozygotes, all three compound heterozygotes, and just 18 were heterozygotes (7% of those). CONCLUSIONS In this population, most G6PD heterozygosity in females occurred between 30% and 70% of normal (69·3%; 183/264). The prevalence of females at risk of G6PD misclassification as normal by qualitative screening was 9·5% (183/1928). Qualitative G6PD screening prior to 8-aminoquinoline therapies against P. vivax may leave one in ten females at risk of hemolytic crisis, which may be remedied by point-of-care quantitative tests.
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Affiliation(s)
| | | | | | - Decy Subekti
- Eijkman Institute for Molecular Biology, Jakarta, Indonesia
- Eijkman-Oxford Clinical Research Unit, Jakarta, Indonesia
| | - Iqbal Elyazar
- Eijkman Institute for Molecular Biology, Jakarta, Indonesia
- Eijkman-Oxford Clinical Research Unit, Jakarta, Indonesia
| | - Saraswati Soebianto
- Eijkman Institute for Molecular Biology, Jakarta, Indonesia
- Eijkman-Oxford Clinical Research Unit, Jakarta, Indonesia
| | - Nunung Mahpud
- Eijkman Institute for Molecular Biology, Jakarta, Indonesia
- Eijkman-Oxford Clinical Research Unit, Jakarta, Indonesia
| | | | - J. Kevin Baird
- Eijkman Institute for Molecular Biology, Jakarta, Indonesia
- Eijkman-Oxford Clinical Research Unit, Jakarta, Indonesia
- Centre for Tropical Medicine & Global Health, Nuffield Department of Medicine, University of Oxford, Oxford, United Kingdom
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Baird JK. Single loading-dose tafenoquine for malaria chemoprophylaxis during brief travel? J Travel Med 2021; 28:6287694. [PMID: 34050367 PMCID: PMC8271189 DOI: 10.1093/jtm/taab081] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/22/2021] [Indexed: 01/29/2023]
Affiliation(s)
- J Kevin Baird
- Eijkman-Oxford Clinical Research Unit, Eijkman Institute of Molecular Biology, Jakarta, Indonesia.,Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford, Oxford, UK
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Li J, Chen Y, Ou Z, Ouyang F, Liang J, Jiang Z, Chen C, Li P, Chen J, Wei J, Zeng J. Aspirin Therapy in Cardiovascular Disease with Glucose-6-Phosphate Dehydrogenase Deficiency, Safe or Not? Am J Cardiovasc Drugs 2021; 21:377-382. [PMID: 33313989 DOI: 10.1007/s40256-020-00460-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 11/20/2020] [Indexed: 10/22/2022]
Abstract
Glucose-6-phosphate dehydrogenase (G6PD) deficiency is the most common human enzyme defect, which may present as acute hemolysis, neonatal jaundice, or chronic hemolysis. Ingestion of fava beans, as well as infection and certain drugs, are the most typical causes of acute hemolysis in people with G6PD deficiency. Aspirin, the cornerstone in current therapies for the prevention of cardiovascular disease (CVD), is occasionally reported to induce acute hemolysis in G6PD-deficient individuals. G6PD deficiency is typically asymptomatic and many CVD patients with this enzyme defect start to take long-term aspirin therapy without G6PD activity examination; however, no consensus on the safety of aspirin in this population has been reached. A few studies have reported on this issue and produced contradictory results. In this review, we discuss the possible mechanisms of aspirin-induced hemolysis, and summarize clinical evidence regarding the safety of aspirin in subjects with G6PD deficiency.
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Ahmad SS, Rahi M, Sharma A. Relapses of Plasmodium vivax malaria threaten disease elimination: time to deploy tafenoquine in India? BMJ Glob Health 2021; 6:bmjgh-2020-004558. [PMID: 33619041 PMCID: PMC7903102 DOI: 10.1136/bmjgh-2020-004558] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2020] [Revised: 01/30/2021] [Accepted: 02/02/2021] [Indexed: 12/21/2022] Open
Affiliation(s)
- Sundus Shafat Ahmad
- Parasite and Host Biology, National Institute of Malaria Research, New Delhi, Delhi, India
| | - Manju Rahi
- Epidemiology and Communicable Diseases, Indian Council of Medical Research, New Delhi, Delhi, India
| | - Amit Sharma
- Parasite and Host Biology, National Institute of Malaria Research, New Delhi, Delhi, India
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36
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Suratanee A, Buaboocha T, Plaimas K. Prediction of Human- Plasmodium vivax Protein Associations From Heterogeneous Network Structures Based on Machine-Learning Approach. Bioinform Biol Insights 2021; 15:11779322211013350. [PMID: 34188457 PMCID: PMC8212370 DOI: 10.1177/11779322211013350] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2021] [Accepted: 04/04/2021] [Indexed: 11/24/2022] Open
Abstract
Malaria caused by Plasmodium vivax can lead to severe morbidity and death. In addition, resistance has been reported to existing drugs in treating this malaria. Therefore, the identification of new human proteins associated with malaria is urgently needed for the development of additional drugs. In this study, we established an analysis framework to predict human-P. vivax protein associations using network topological profiles from a heterogeneous network structure of human and P. vivax, machine-learning techniques and statistical analysis. Novel associations were predicted and ranked to determine the importance of human proteins associated with malaria. With the best-ranking score, 411 human proteins were identified as promising proteins. Their regulations and functions were statistically analyzed, which led to the identification of proteins involved in the regulation of membrane and vesicle formation, and proteasome complexes as potential targets for the treatment of P. vivax malaria. In conclusion, by integrating related data, our analysis was efficient in identifying potential targets providing an insight into human-parasite protein associations. Furthermore, generalizing this model could allow researchers to gain further insights into other diseases and enhance the field of biomedical science.
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Affiliation(s)
- Apichat Suratanee
- Department of Mathematics, Faculty of
Applied Science, King Mongkut’s University of Technology North Bangkok, Bangkok,
Thailand
| | - Teerapong Buaboocha
- Department of Biochemistry, Faculty of
Science, Chulalongkorn University, Bangkok, Thailand
- Omics Sciences and Bioinformatics
Center, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
| | - Kitiporn Plaimas
- Omics Sciences and Bioinformatics
Center, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
- Advanced Virtual and Intelligent
Computing (AVIC) Center, Department of Mathematics and Computer Science, Faculty of
Science, Chulalongkorn University, Bangkok, Thailand
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Chamchoy K, Praoparotai A, Pakparnich P, Sudsumrit S, Swangsri T, Chamnanchanunt S, Songdej D, Imwong M, Boonyuen U. The integrity and stability of specimens under different storage conditions for glucose-6-phosphate dehydrogenase deficiency screening using WST-8. Acta Trop 2021; 217:105864. [PMID: 33607062 DOI: 10.1016/j.actatropica.2021.105864] [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: 12/07/2020] [Revised: 02/09/2021] [Accepted: 02/12/2021] [Indexed: 10/22/2022]
Abstract
Accurate measurement of glucose-6-phosphate dehydrogenase (G6PD) activity is critical for malaria treatment as misclassification of G6PD deficiency could cause serious harm to patients. G6PD activity should be assessed in blood samples on the day of collection. Otherwise, specimens should be stored under suitable conditions to prevent loss of G6PD activity. Here, we assessed stability and integrity of G6PD testing in samples from normal controls, heterozygous females, and G6PD deficient individuals using water-soluble tetrazolium salts (WST-8) assay. Specimens were stored as ethylenediaminetetraacetic acid (EDTA) whole blood and dried blood spots (DBS) at various temperatures (37 °C, room temperature, 4 °C and -20 °C) and under different humidity conditions (with and without desiccant). G6PD normal samples were stable for up to 1 year when stored at -20 °C under controlled conditions, with 85% and 91% G6PD activity in EDTA whole blood and DBS in the presence of desiccant, respectively. Specimens from heterozygous females showed greater G6PD activity when stored as DBS, with 85% enzyme activity after 1 year of storage at -20 °C under controlled conditions in the presence of desiccant. G6PD deficient samples rapidly lost enzyme activity in all storage conditions tested. However, the reduction in G6PD enzyme activity in G6PD deficient samples did not interfere with G6PD classification. Samples stored under suitable conditions for G6PD testing will allow accurate measurement of enzyme activity, prevent misclassification of G6PD deficiency and enable safe and effective use of antimalarial drugs such as primaquine and tafenoquine.
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Boonyuen U, Songdej D, Tanyaratsrisakul S, Phuanukoonnon S, Chamchoy K, Praoparotai A, Pakparnich P, Sudsumrit S, Edwards T, Williams CT, Byrne RL, Adams ER, Imwong M. Glucose-6-phosphate dehydrogenase mutations in malaria endemic area of Thailand by multiplexed high-resolution melting curve analysis. Malar J 2021; 20:194. [PMID: 33879156 PMCID: PMC8056697 DOI: 10.1186/s12936-021-03731-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Accepted: 04/08/2021] [Indexed: 12/26/2022] Open
Abstract
Background Glucose-6-phosphate dehydrogenase (G6PD) deficiency, the most common enzymopathy in humans, is prevalent in tropical and subtropical areas where malaria is endemic. Anti-malarial drugs, such as primaquine and tafenoquine, can cause haemolysis in G6PD-deficient individuals. Hence, G6PD testing is recommended before radical treatment against vivax malaria. Phenotypic assays have been widely used for screening G6PD deficiency, but in heterozygous females, the random lyonization causes difficulty in interpreting the results. Over 200 G6PD variants have been identified, which form genotypes associated with differences in the degree of G6PD deficiency and vulnerability to haemolysis. This study aimed to assess the frequency of G6PD mutations using a newly developed molecular genotyping test. Methods A multiplexed high-resolution melting (HRM) assay was developed to detect eight G6PD mutations, in which four mutations can be tested simultaneously. Validation of the method was performed using 70 G6PD-deficient samples. The test was then applied to screen 725 blood samples from people living along the Thai–Myanmar border. The enzyme activity of these samples was also determined using water-soluble tetrazolium salts (WST-8) assay. Then, the correlation between genotype and enzyme activity was analysed. Results The sensitivity of the multiplexed HRM assay for detecting G6PD mutations was 100 % [95 % confidence interval (CI): 94.87–100 %] with specificity of 100 % (95 % CI: 87.66–100 %). The overall prevalence of G6PD deficiency in the studied population as revealed by phenotypic WST-8 assay was 20.55 % (149/725). In contrast, by the multiplexed HRM assay, 27.17 % (197/725) of subjects were shown to have G6PD mutations. The mutations detected in this study included four single variants, G6PD Mahidol (187/197), G6PD Canton (4/197), G6PD Viangchan (3/197) and G6PD Chinese-5 (1/197), and two double mutations, G6PD Mahidol + Canton (1/197) and G6PD Chinese-4 + Viangchan (1/197). A broad range of G6PD enzyme activities were observed in individuals carrying G6PD Mahidol, especially in females. Conclusions The multiplexed HRM-based assay is sensitive and reliable for detecting G6PD mutations. This genotyping assay can facilitate the detection of heterozygotes, which could be useful as a supplementary approach for high-throughput screening of G6PD deficiency in malaria endemic areas before the administration of primaquine and tafenoquine.
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Affiliation(s)
- Usa Boonyuen
- Department of Molecular Tropical Medicine and Genetics, Faculty of Tropical Medicine, Mahidol University, Bangkok, 10400, Thailand.
| | - Duantida Songdej
- Department of Pediatrics, Faculty of Medicine Ramathibodi Hospital, Mahidol University, Bangkok, 10400, Thailand
| | | | - Suparat Phuanukoonnon
- Department of Social and Environmental Medicine, Faculty of Tropical Medicine, Mahidol University, Bangkok, 10400, Thailand
| | - Kamonwan Chamchoy
- Faculty of Medicine and Public Health, HRH Princess Chulabhorn College of Medical Science, Chulabhorn Royal Academy, Bangkok, 10210, Thailand
| | - Aun Praoparotai
- Department of Molecular Tropical Medicine and Genetics, Faculty of Tropical Medicine, Mahidol University, Bangkok, 10400, Thailand
| | - Phonchanan Pakparnich
- Department of Molecular Tropical Medicine and Genetics, Faculty of Tropical Medicine, Mahidol University, Bangkok, 10400, Thailand
| | - Sirapapha Sudsumrit
- Department of Molecular Tropical Medicine and Genetics, Faculty of Tropical Medicine, Mahidol University, Bangkok, 10400, Thailand
| | - Thomas Edwards
- Centre for Drugs and Diagnostics, Liverpool School of Tropical Medicine, L3 5QA, Liverpool, UK
| | - Christopher T Williams
- Centre for Drugs and Diagnostics, Liverpool School of Tropical Medicine, L3 5QA, Liverpool, UK
| | - Rachel L Byrne
- Centre for Drugs and Diagnostics, Liverpool School of Tropical Medicine, L3 5QA, Liverpool, UK
| | - Emily R Adams
- Centre for Drugs and Diagnostics, Liverpool School of Tropical Medicine, L3 5QA, Liverpool, UK
| | - Mallika Imwong
- Department of Molecular Tropical Medicine and Genetics, Faculty of Tropical Medicine, Mahidol University, Bangkok, 10400, Thailand
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39
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Abstract
Cindy S Chu and co-authors review options for diagnosis, safe and radical cure, and relapse prevention of Plasmodium Vivax.
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Affiliation(s)
- Cindy S. Chu
- Shoklo Malaria Research Unit-Mahidol Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Mae Sot, Thailand
- Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford, Headington, Oxford, United Kingdom
- * E-mail:
| | - Nicholas J. White
- Shoklo Malaria Research Unit-Mahidol Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Mae Sot, Thailand
- Mahidol Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
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40
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Popovici J, Tebben K, Witkowski B, Serre D. Primaquine for Plasmodium vivax radical cure: What we do not know and why it matters. Int J Parasitol Drugs Drug Resist 2021; 15:36-42. [PMID: 33529838 PMCID: PMC7851417 DOI: 10.1016/j.ijpddr.2020.12.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Revised: 12/15/2020] [Accepted: 12/21/2020] [Indexed: 11/26/2022]
Abstract
Plasmodium vivax radical cure requires the administration of a blood schizonticide for killing blood-stage parasites and the addition of a drug able to kill hypnozoites, the dormant parasite stages residing in the liver of infected patients. All drugs used clinically for killing hypnozoites are 8-aminoquinolines and among them, primaquine has been at the forefront of P. vivax case management for decades. We discuss here the possible factors that could lead to the emergence and selection of P. vivax primaquine resistant parasites and emphasize on how a better understanding of the mechanisms underlying primaquine treatment and hypnozoite biology is needed to prevent this catastrophic scenario from happening.
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Affiliation(s)
- Jean Popovici
- Malaria Molecular Epidemiology Unit, Institut Pasteur du Cambodge, Phnom Penh, Cambodia; Malaria Translational Research Unit, Institut Pasteur, Paris & Institut Pasteur du Cambodge, Phnom Penh, Cambodia.
| | - Kieran Tebben
- Institute for Genome Sciences, University of Maryland School of Medicine, Baltimore, USA
| | - Benoit Witkowski
- Malaria Molecular Epidemiology Unit, Institut Pasteur du Cambodge, Phnom Penh, Cambodia; Malaria Translational Research Unit, Institut Pasteur, Paris & Institut Pasteur du Cambodge, Phnom Penh, Cambodia
| | - David Serre
- Institute for Genome Sciences, University of Maryland School of Medicine, Baltimore, USA
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Bancone G, Chu CS. G6PD Variants and Haemolytic Sensitivity to Primaquine and Other Drugs. Front Pharmacol 2021; 12:638885. [PMID: 33790795 PMCID: PMC8005603 DOI: 10.3389/fphar.2021.638885] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2020] [Accepted: 02/01/2021] [Indexed: 02/04/2023] Open
Abstract
Restrictions on the cultivation and ingestion of fava beans were first reported as early as the fifth century BC. Not until the late 19th century were clinical descriptions of fava-induced disease reported and soon after characterised as “favism” in the early 20th century. It is now well known that favism as well as drug-induced haemolysis is caused by a deficiency of the glucose-6-phosphate dehydrogenase (G6PD) enzyme, one of the most common enzyme deficiency in humans. Interest about the interaction between G6PD deficiency and therapeutics has increased recently because mass treatment with oxidative 8-aminoquinolines is necessary for malaria elimination. Historically, assessments of haemolytic risk have focused on the clinical outcomes (e.g., haemolysis) associated with either a simplified phenotypic G6PD characterisation (deficient or normal) or an ill-fitting classification of G6PD genetic variants. It is increasingly apparent that detailed knowledge of both aspects is required for a complete understanding of haemolytic risk. While more attention has been devoted recently to better phenotypic characterisation of G6PD activity (including the development of new point-of care tests), the classification of G6PD variants should be revised to be clinically useful in malaria eliminating countries and in populations with prevalent G6PD deficiency. The scope of this work is to summarize available literature on drug-induced haemolysis among individuals with different G6PD variants and to highlight knowledge gaps that could be filled with further clinical and laboratory research.
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Affiliation(s)
- Germana Bancone
- Shoklo Malaria Research Unit, Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Mae Sot, Thailand.,Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford, Oxford, United Kingdom
| | - Cindy S Chu
- Shoklo Malaria Research Unit, Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Mae Sot, Thailand.,Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford, Oxford, United Kingdom
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Glucose-6-phosphate dehydrogenase deficiency. Blood 2021; 136:1225-1240. [PMID: 32702756 DOI: 10.1182/blood.2019000944] [Citation(s) in RCA: 142] [Impact Index Per Article: 47.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2019] [Accepted: 12/12/2019] [Indexed: 11/20/2022] Open
Abstract
Glucose 6-phosphate dehydrogenase (G6PD) deficiency is 1 of the commonest human enzymopathies, caused by inherited mutations of the X-linked gene G6PD. G6PD deficiency makes red cells highly vulnerable to oxidative damage, and therefore susceptible to hemolysis. Over 200 G6PD mutations are known: approximately one-half are polymorphic and therefore common in various populations. Some 500 million persons with any of these mutations are mostly asymptomatic throughout their lifetime; however, any of them may develop acute and sometimes very severe hemolytic anemia when triggered by ingestion of fava beans, by any of a number of drugs (for example, primaquine, rasburicase), or, more rarely, by infection. Approximately one-half of the G6PD mutations are instead sporadic: rare patients with these mutations present with chronic nonspherocytic hemolytic anemia. Almost all G6PD mutations are missense mutations, causing amino acid replacements that entail deficiency of G6PD enzyme activity: they compromise the stability of the protein, the catalytic activity is decreased, or a combination of both mechanisms occurs. Thus, genotype-phenotype correlations have been reasonably well clarified in many cases. G6PD deficiency correlates remarkably, in its geographic distribution, with past/present malaria endemicity: indeed, it is a unique example of an X-linked human polymorphism balanced through protection of heterozygotes from malaria mortality. Acute hemolytic anemia can be managed effectively provided it is promptly diagnosed. Reliable diagnostic procedures are available, with point-of-care tests becoming increasingly important where primaquine and its recently introduced analog tafenoquine are required for the elimination of malaria.
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Abstract
Introduction: A century-long history in 8-aminoquinolines, the only anti-malaria drug class preventing malaria relapse, has resulted in the approval of tafenoquine by the U.S. Food and Drug Administration (FDA) and the Australian Therapeutic Goods Administration (TGA) and to date registration in Brazil and Thailand. Tafenoquine is an alternative anti-relapse treatment for vivax malaria and malaria prophylaxis. It should not be given in pregnancy, during lactation of infants with glucose-6-phosphate dehydrogenase (G6PD) unknown or deficient status, and in those with G6PD deficiency or psychiatric illness.Areas covered: This systematic review assesses tafenoquine associated adverse events in English-language, human clinical trials. Meta-analysis of commonly reported adverse events was conducted and grouped by comparison arms.Expert opinion: Tafenoquine, either for radical cure or prophylaxis, is generally well tolerated in adults. There is no convincing evidence for neurologic, ophthalmic, and cardiac toxicities. Psychotic disorder which has been attributed to higher doses is a contraindication for the chemoprophylaxis indication and psychiatric illness is a warning for the radical cure indication. Pregnancy assessment and quantitative G6PD testing are required. The optimal radical curative regimen including the tafenoquine dose along with its safety for parts of Southeast Asia, South America, and Oceania needs further assessment.
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Affiliation(s)
- Cindy S. Chu
- Shoklo Malaria Research Unit, Faculty of Tropical Medicine, Mahidol University, Mae Sot, Thailand
- Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford, UK
| | - Jimee Hwang
- U.S. President’s Malaria Initiative, Malaria Branch, Division of Parasitic Diseases and Malaria, Centers for Disease Control and Prevention, Atlanta, GA, USA
- Global Health Group, University of California San Francisco, San Francisco, CA, USA
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Weeratunga P, Bancone G, Ochodo EA, Pant S, Thapa J, Chaplin M. Glucose-6-phosphate dehydrogenase deficiency near-patient tests for tafenoquine or primaquine use with Plasmodium vivax malaria. Hippokratia 2021. [DOI: 10.1002/14651858.cd013861] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Praveen Weeratunga
- Department of Clinical Medicine ; Faculty of Medicine, University of Colombo; Colombo Sri Lanka
| | - Germana Bancone
- Shoklo Malaria Research Unit, Mahidol Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine; Mahidol University; Mae Sot Thailand
- Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine; University of Oxford; Oxford UK
| | - Eleanor A Ochodo
- Centre for Evidence-based Health Care, Department of Global Health, Faculty of Medicine and Health Sciences; Stellenbosch University; Cape Town South Africa
- Centre for Global Health Research; Kenya Medical Research Institute; Kisumu Kenya
| | - Smriti Pant
- Department of Community Health Sciences ; Patan Academy of Health Sciences; Lagankhel, Lalitpur Nepal
| | - Jeevan Thapa
- Department of Community Health Sciences; Patan Academy of Health Sciences; Lagankhel, Lalitpur Nepal
| | - Marty Chaplin
- Department of Clinical Sciences; Liverpool School of Tropical Medicine; Liverpool UK
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Chemoprotective antimalarials identified through quantitative high-throughput screening of Plasmodium blood and liver stage parasites. Sci Rep 2021; 11:2121. [PMID: 33483532 PMCID: PMC7822874 DOI: 10.1038/s41598-021-81486-z] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2020] [Accepted: 01/05/2021] [Indexed: 12/20/2022] Open
Abstract
The spread of Plasmodium falciparum parasites resistant to most first-line antimalarials creates an imperative to enrich the drug discovery pipeline, preferably with curative compounds that can also act prophylactically. We report a phenotypic quantitative high-throughput screen (qHTS), based on concentration–response curves, which was designed to identify compounds active against Plasmodium liver and asexual blood stage parasites. Our qHTS screened over 450,000 compounds, tested across a range of 5 to 11 concentrations, for activity against Plasmodium falciparum asexual blood stages. Active compounds were then filtered for unique structures and drug-like properties and subsequently screened in a P. berghei liver stage assay to identify novel dual-active antiplasmodial chemotypes. Hits from thiadiazine and pyrimidine azepine chemotypes were subsequently prioritized for resistance selection studies, yielding distinct mutations in P. falciparum cytochrome b, a validated antimalarial drug target. The thiadiazine chemotype was subjected to an initial medicinal chemistry campaign, yielding a metabolically stable analog with sub-micromolar potency. Our qHTS methodology and resulting dataset provides a large-scale resource to investigate Plasmodium liver and asexual blood stage parasite biology and inform further research to develop novel chemotypes as causal prophylactic antimalarials.
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Ryan K, Tekwani BL. Current investigations on clinical pharmacology and therapeutics of Glucose-6-phosphate dehydrogenase deficiency. Pharmacol Ther 2020; 222:107788. [PMID: 33326820 DOI: 10.1016/j.pharmthera.2020.107788] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2020] [Revised: 12/04/2020] [Accepted: 12/05/2020] [Indexed: 12/19/2022]
Abstract
Glucose-6-phospate dehydrogenase (G6PD) deficiency is estimated to affect more than 400 million people world-wide. This X-linked genetic deficiency puts stress on red blood cells (RBC), which may be further augmented under certain pathophysiological conditions and drug treatments. These conditions can cause hemolytic anemia and eventually lead to multi-organ failure and mortality. G6PD is involved in the rate-limiting step of the pentose phosphate pathway, which generates reduced nicotinamide adenine dinucleotide phosphate (NADPH). In RBCs, the NADPH/G6PD pathway is the only source for recycling reduced glutathione and provides protection from oxidative stress. Susceptibility of G6PD deficient populations to certain drug treatments and potential risks of hemolysis are important public health issues. A number of clinical trials are currently in progress investigating clinical factors associated with G6PD deficiency, validation of new diagnostic kits for G6PD deficiency, and evaluating drug safety, efficacy, and pathophysiology. More than 25 clinical studies in G6PD populations are currently in progress or have just been completed that have been examined for clinical pharmacology and potential therapeutic implications of G6PD deficiency. The information on clinical conditions, interventions, purpose, outcome, and status of these clinical trials has been studied. A critical review of ongoing clinical investigations on pharmacology and therapeutics of G6PD deficiency should be highly important for researchers, clinical pharmacologists, pharmaceutical companies, and global public health agencies. The information may be useful for developing strategies for treatment and control of hemolytic crisis and potential drug toxicities in G6PD deficient patients.
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Affiliation(s)
- Kaitlyn Ryan
- Department of Infectious Diseases, Division of Drug Discovery, Southern Research, 2000 9(th) Avenue South, Birmingham, AL 35205, United States of America.
| | - Babu L Tekwani
- Department of Infectious Diseases, Division of Drug Discovery, Southern Research, 2000 9(th) Avenue South, Birmingham, AL 35205, United States of America.
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Ferreira MU, Nobrega de Sousa T, Rangel GW, Johansen IC, Corder RM, Ladeia-Andrade S, Gil JP. Monitoring Plasmodium vivax resistance to antimalarials: Persisting challenges and future directions. INTERNATIONAL JOURNAL FOR PARASITOLOGY-DRUGS AND DRUG RESISTANCE 2020; 15:9-24. [PMID: 33360105 PMCID: PMC7770540 DOI: 10.1016/j.ijpddr.2020.12.001] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/12/2020] [Revised: 11/27/2020] [Accepted: 12/01/2020] [Indexed: 11/23/2022]
Abstract
Emerging antimalarial drug resistance may undermine current efforts to control and eliminate Plasmodium vivax, the most geographically widespread yet neglected human malaria parasite. Endemic countries are expected to assess regularly the therapeutic efficacy of antimalarial drugs in use in order to adjust their malaria treatment policies, but proper funding and trained human resources are often lacking to execute relatively complex and expensive clinical studies, ideally complemented by ex vivo assays of drug resistance. Here we review the challenges for assessing in vivo P. vivax responses to commonly used antimalarials, especially chloroquine and primaquine, in the presence of confounding factors such as variable drug absorption, metabolism and interaction, and the risk of new infections following successful radical cure. We introduce a simple modeling approach to quantify the relative contribution of relapses and new infections to recurring parasitemias in clinical studies of hypnozoitocides. Finally, we examine recent methodological advances that may render ex vivo assays more practical and widely used to confirm P. vivax drug resistance phenotypes in endemic settings and review current approaches to the development of robust genetic markers for monitoring chloroquine resistance in P. vivax populations. Plasmodium vivax resistance to chloroquine may undermine malaria elimination efforts. Plasmodium vivax resistance to schizontocides has been mostly monitored in therapeutic efficacy studies. In vivo studies to determine the anti-relapse efficacy of primaquine are challenging to design and execute. Ex vivo assays to determine Plasmodium vivax resistance to schizontocides remain limited to research settings. Robust molecular markers to monitor Plasmodium vivax drug resistance are currently lacking.
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Affiliation(s)
- Marcelo U Ferreira
- Department of Parasitology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil; Global Health and Tropical Medicine, Institute of Hygiene and Tropical Medicine, Nova University of Lisbon, Lisbon, Portugal.
| | - Tais Nobrega de Sousa
- Molecular Biology and Malaria Immunology Research Group, René Rachou Institute, Fiocruz, Belo Horizonte, Brazil
| | - Gabriel W Rangel
- Department of Biochemistry and Molecular Biology, Pennsylvania State University, University Park, PA, USA
| | - Igor C Johansen
- Department of Parasitology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
| | - Rodrigo M Corder
- Department of Parasitology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
| | - Simone Ladeia-Andrade
- Laboratory of Parasitic Diseases, Oswaldo Cruz Institute, Fiocruz, Rio de Janeiro, Brazil
| | - José Pedro Gil
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institute, Solna, Sweden
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Maier JD, Siegfried S, Gültekin N, Stanga Z, Baird JK, Grobusch MP, Schlagenhauf P. Efficacy and safety of tafenoquine for malaria chemoprophylaxis (1998-2020): A systematic review and meta-analysis. Travel Med Infect Dis 2020; 39:101908. [PMID: 33227500 DOI: 10.1016/j.tmaid.2020.101908] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2020] [Revised: 10/21/2020] [Accepted: 10/22/2020] [Indexed: 01/08/2023]
Abstract
BACKGROUND In 2018, tafenoquine was approved for malaria chemoprophylaxis. We evaluated all available data on the safety and efficacy of tafenoquine chemoprophylaxis. METHODS This systematic review followed the PRISMA guidelines and was registered on PROSPERO (CRD42019123839). We searched PubMed, Embase, Scopus, CINAHL and Cochrane databases. Two authors (JDM, PS) screened all papers. RESULTS We included 44 papers in the qualitative and 9 in the quantitative analyses. These 9 randomized, controlled trials included 2495 participants, aged 12-60 years with 27.3% women. Six studies were conducted in Plasmodium spp.-endemic regions; two were human infection studies. 200 mg weekly tafenoquine and higher dosages lead to a significant reduction of Plasmodium spp. infection compared to placebo and were comparable to 250 mg mefloquine weekly with a protective efficacy between 77.9 and 100% or a total risk ratio of 0.22 (95%-CI: 0.07-0.73; p = 0.013) in favour of tafenoquine. Adverse events (AE) were comparable in frequency and severity between tafenoquine and comparator arms. One study reported significantly more gastrointestinal events in tafenoquine users (p ≤ 0.001). Evidence of increased, reversible, asymptomatic vortex keratopathy in subjects with prolonged tafenoquine exposures was found. A single, serious event of decreased macular sensitivity occurred. CONCLUSION This systematic review and meta-analysis of trials of G6PD-normal adults show that weekly tafenoquine 200 mg is well tolerated and effective as malaria chemoprophylaxis focusing primarily on Plasmodium falciparum but also on Plasmodium vivax. Our safety analysis is limited by heterogenous methods of adverse events reporting. Further research is indicated on the use of tafenoquine in diverse traveller populations.
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Affiliation(s)
- Julian D Maier
- University of Zurich Centre for Travel Medicine, WHO Collaborating Centre for Travellers' Health, Department of Public and Global Health, MilMedBiol Competence Centre, Institute for Epidemiology, Biostatistics and Prevention, University of Zurich, Hirschengraben 84, 8001, Zurich, Switzerland
| | - Sandra Siegfried
- University of Zurich, Biostatistics Department at Epidemiology, Biostatistics and Prevention Institute, Switzerland
| | - Nejla Gültekin
- Centre of Competence for Military and Disaster Medicine, Federal Department of Defence, Civil Protection and Sport DDPS, Swiss Armed Forces, Medical Services, Ittigen, Switzerland
| | - Zeno Stanga
- Centre of Competence for Military and Disaster Medicine, Federal Department of Defence, Civil Protection and Sport DDPS, Swiss Armed Forces, Medical Services, Ittigen, Switzerland
| | - J Kevin Baird
- Eijkman-Oxford Clinical Research Unit, Eijkman Institute for Molecular Biology, Jakarta, Indonesia, Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford, Oxford, UK
| | - Martin P Grobusch
- Centre of Tropical Medicine and Travel Medicine, Department of Infectious Diseases, Division of Internal Medicine, Amsterdam University Medical Centres, Amsterdam Public Health, Amsterdam Infection & Immunity, University of Amsterdam, Amsterdam, the Netherlands
| | - Patricia Schlagenhauf
- University of Zurich Centre for Travel Medicine, WHO Collaborating Centre for Travellers' Health, Department of Public and Global Health, MilMedBiol Competence Centre, Institute for Epidemiology, Biostatistics and Prevention, University of Zurich, Hirschengraben 84, 8001, Zurich, Switzerland.
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Rodrigo C, Rajapakse S, Fernando D. Tafenoquine for preventing relapse in people with Plasmodium vivax malaria. Cochrane Database Syst Rev 2020; 9:CD010458. [PMID: 32892362 PMCID: PMC8094590 DOI: 10.1002/14651858.cd010458.pub3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
BACKGROUND Plasmodium vivax malaria has a persistent liver stage that causes relapse of the disease and continued P vivax transmission. Primaquine (PQ) is used to clear the liver stage of the parasite, but treatment is required for 14 days. Primaquine also causes haemolysis in people with glucose-6-phosphate dehydrogenase (G6PD) deficiency. Tafenoquine (TQ) is a new alternative to PQ with a longer half-life and can be used as a single-dose treatment. OBJECTIVES To assess the effects of tafenoquine 300 mg (single dose) on preventing P vivax relapse. SEARCH METHODS We searched the following up to 3 June 2020: the Cochrane Infectious Diseases Group Specialized Register; CENTRAL; MEDLINE; Embase; and three other databases. We also searched the WHO International Clinical Trial Registry Platform and the metaRegister of Controlled Trials for ongoing trials using "tafenoquine" and "malaria" as search terms up to 3 June 2020. SELECTION CRITERIA Randomized controlled trials (RCTs) that gave TQ to prevent relapse in people with P vivax malaria. We planned to include trials irrespective of whether participants had been screened for G6PD enzyme deficiency. DATA COLLECTION AND ANALYSIS All review authors independently extracted data and assessed risk of bias. As true relapse and reinfection are difficult to differentiate in people living in endemic areas, studies report "recurrences" of infection as a proxy for relapse. We carried out meta-analysis where appropriate, and gave estimates as risk ratios (RR) with 95% confidence intervals (CI). We assessed the certainty of the evidence using the GRADE approach. MAIN RESULTS Three individually randomized RCTs met our inclusion criteria, all in endemic areas, and thus reporting recurrence. Trials compared TQ with PQ or placebo, and all participants received chloroquine (CQ) to treat the asexual infection). In all trials, pregnant and G6PD-deficient people were excluded. Tafenoquine 300 mg single dose versus no treatment for relapse prevention Two trials assessed this comparison. TQ 300 mg single dose reduces P vivax recurrences compared to no antihypnozoite treatment during a six-month follow-up, but there is moderate uncertainty around effect size (RR 0.32, 95% CI 0.12 to 0.88; 2 trials, 504 participants; moderate-certainty evidence). In people with normal G6PD status, there is probably little or no difference in any type of adverse events (2 trials, 504 participants; moderate-certainty evidence). However, we are uncertain if TQ causes more serious adverse events (2 trials, 504 participants; very low-certainty evidence). Both RCTs reported a total of 23 serious adverse events in TQ groups (One RCT reported 21 events) and a majority (15 events) were a drop in haemoglobin level by > 3g/dl (or >30% reduction from baseline). Tafenoquine 300 mg single dose versus primaquine 15 mg/day for 14 days for relapse prevention Three trials assessed this comparison. There is probably little or no difference between TQ and PQ in preventing recurrences (proxy measure for relapse) up to six months of follow-up (RR 1.04, 95% CI 0.8 to 1.34; 3 trials, 747 participants; moderate-certainty evidence). In people with normal G6PD status, there is probably little or no difference in any type of adverse events (3 trials, 747 participants; moderate-certainty evidence). We are uncertain if TQ can cause more serious adverse events compared to PQ (3 trials, 747 participants; very low-certainty evidence). Two trials had higher point estimates against TQ while the other showed the reverse. Most commonly reported serious adverse event in TQ group was a decline in haemoglobin level (19 out of 29 events). Some other serious adverse events, though observed in the TQ group, are unlikely to be caused by it (Hepatitis E infection, limb abscess, pneumonia, menorrhagia). AUTHORS' CONCLUSIONS TQ 300 mg single dose prevents relapses after clinically parasitologically confirmed P vivax malaria compared to no antihypnozoite treatment, and with no difference detected in studies comparing it to PQ to date. However, the inability to differentiate a true relapse from a recurrence in the available studies may affect these estimates. The drug is untested in children and in people with G6PD deficiency. Single-dose treatment is an important practical advantage compared to using PQ for the same purpose without an overall increase in adverse events in non-pregnant, non-G6PD-deficient adults.
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Affiliation(s)
- Chaturaka Rodrigo
- Department of Pathology, School of Medical Sciences, University of New South Wales, Sydney, Australia
| | - Senaka Rajapakse
- Department of Clinical Medicine, Faculty of Medicine, University of Colombo, Colombo, Sri Lanka
| | - Deepika Fernando
- Department of Parasitology, Faculty of Medicine, University of Colombo, Colombo, Sri Lanka
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Chen Y, Li J, Ou Z, Zhang Y, Liang Z, Deng W, Huang W, Wu Z, Jiang H, Liu Q, Ouyang F, Xing S, Zeng J. Safety and efficacy of low-dose aspirin in ischemic stroke patients with different G6PD conditions. Int J Stroke 2020; 16:411-419. [PMID: 32878589 DOI: 10.1177/1747493020950903] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
BACKGROUND AND PURPOSE Aspirin is the first recommended antiplatelet agent to prevention secondary stroke, but its safety and efficacy in stroke patients with glucose-6-phosphate dehydrogenase deficiency remain unclear. We sought to evaluate its safety and efficacy in ischemic stroke patients with and without glucose-6-phosphate dehydrogenase deficiency. METHODS Patients with ischemic stroke receiving aspirin (100 mg/day) for three months were recruited for a multicenter, prospective, cohort study. Blood glucose-6-phosphate dehydrogenase activity was examined after stroke. Safety outcomes including acute hemolysis, moderate-to-severe bleeding, and death (vascular, all-cause), and efficacy outcome indicated as stroke recurrence were evaluated at three months. Risk factors associated with moderate-to-severe bleeding and all-cause death were determined using multivariate or Cox regression analysis. RESULTS Among the included 1121 patients, 81 of 130 glucose-6-phosphate dehydrogenase deficient and 576 of 991 glucose-6-phosphate dehydrogenase normal patients received aspirin for three months. Acute hemolysis was observed in one of the glucose-6-phosphate dehydrogenase deficient and in none of the glucose-6-phosphate dehydrogenase normal patients (p = 0.876). The rates of moderate-to-severe bleeding were 2.5% and 0.3% (p = 0.045), and the percentages of all-cause death were 6.2% and 1.4% (p = 0.008) in the glucose-6-phosphate dehydrogenase deficient and glucose-6-phosphate dehydrogenase normal patients. Stroke recurrence rate was similar in the two groups (2.5% vs. 1.7%; p = 0.608). Glucose-6-phosphate dehydrogenase deficiency was significantly associated with increased risk of moderate-to-severe bleeding (adjust p = 0.048) and all-cause death during aspirin use (adjust p = 0.008). CONCLUSIONS Long-term low-dose aspirin therapy might relate to worse safety outcomes in patients with glucose-6-phosphate dehydrogenase deficiency and large clinical trials are needed to further confirm these findings.
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Affiliation(s)
- Yicong Chen
- Department of Neurology and Stroke Center, The First Affiliated Hospital, Sun Yat-sen University, Guangdong Provincial Key Laboratory for Diagnosis and Treatment of Major Neurological Diseases, National Key Clinical Department and Key Discipline of Neurology, Guangzhou, China
| | - Jianle Li
- Department of Neurology and Stroke Center, The First Affiliated Hospital, Sun Yat-sen University, Guangdong Provincial Key Laboratory for Diagnosis and Treatment of Major Neurological Diseases, National Key Clinical Department and Key Discipline of Neurology, Guangzhou, China
| | - Zilin Ou
- Department of Neurology and Stroke Center, The First Affiliated Hospital, Sun Yat-sen University, Guangdong Provincial Key Laboratory for Diagnosis and Treatment of Major Neurological Diseases, National Key Clinical Department and Key Discipline of Neurology, Guangzhou, China
| | - Yusheng Zhang
- Department of Neurology, The First Affiliated Hospital of Jinan University, Guangzhou, China
| | - Zhijian Liang
- Department of Neurology, The First Affiliated Hospital of Jinan University, Guangzhou, China
| | - Weisheng Deng
- Department of Neurology, The First Affiliated Hospital of Guangxi Medical University, Nanning, China
| | - Weixian Huang
- Department of Neurology, Meizhou People's Hospital, Meizhou, China
| | - Zhengdong Wu
- Department of Neurology and Stroke Center, The First Affiliated Hospital, Sun Yat-sen University, Guangdong Provincial Key Laboratory for Diagnosis and Treatment of Major Neurological Diseases, National Key Clinical Department and Key Discipline of Neurology, Guangzhou, China
| | - Haihong Jiang
- Department of Neurology, The First Affiliated Hospital of Jinan University, Guangzhou, China
| | - Qinghua Liu
- Department of Neurology, The First Affiliated Hospital of Guangxi Medical University, Nanning, China
| | - Fubing Ouyang
- Department of Neurology, Meizhou People's Hospital, Meizhou, China
| | - Shihui Xing
- Section II, Department of Neurology, The First Affiliated Hospital, Sun Yat-sen University, National Key Clinical Department and Key Discipline of Neurology, Guangzhou, China
| | - Jinsheng Zeng
- Department of Neurology and Stroke Center, The First Affiliated Hospital, Sun Yat-sen University, Guangdong Provincial Key Laboratory for Diagnosis and Treatment of Major Neurological Diseases, National Key Clinical Department and Key Discipline of Neurology, Guangzhou, China
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