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Wood RC, Luabeya AK, Dragovich RB, Olson AM, Lochner KA, Weigel KM, Codsi R, Mulenga H, de Vos M, Kohli M, Penn-Nicholson A, Hatherill M, Cangelosi GA. Diagnostic accuracy of tongue swab testing on two automated tuberculosis diagnostic platforms, Cepheid Xpert MTB/RIF Ultra and Molbio Truenat MTB Ultima. J Clin Microbiol 2024; 62:e0001924. [PMID: 38483169 PMCID: PMC11005402 DOI: 10.1128/jcm.00019-24] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2024] [Accepted: 02/25/2024] [Indexed: 03/21/2024] Open
Abstract
Tongue dorsum swabbing is a potential alternative to sputum collection for tuberculosis (TB) testing. Previous studies showed that Cepheid Xpert MTB/RIF Ultra (Xpert Ultra) can detect Mycobacterium tuberculosis DNA on tongue swabs stored in buffer, with 72% sensitivity and 100% specificity relative to a sputum microbiological reference standard (sputum MRS). The present study evaluated a more convenient sample collection protocol (dry swab storage), combined with streamlined sample processing protocols, for evaluating two commercial TB diagnostic tests: Xpert Ultra and Molbio Truenat MTB Ultima (MTB Ultima). Copan FLOQSwabs were self-collected or collected by study workers from 321 participants in Western Cape, South Africa. All participants had symptoms suggestive of TB, and 245 of them had sputum MRS-confirmed TB (by sputum MGIT culture and/or Xpert Ultra). One tongue swab per participant was tested on Xpert Ultra, and another tongue swab was tested with MTB Ultima. Xpert Ultra was 75.5% sensitive and 100% specific relative to sputum MRS, similar to previous methods that used swabs stored in buffer. MTB Ultima was 71.6% sensitive and 96.9% specific relative to sputum MRS. When sample lysates that were false-negative or invalid by MTB Ultima were frozen, thawed, and re-tested, MTB Ultima sensitivity rose to 79.1%. Both tests were more sensitive with swabs from participants with higher sputum Xpert Ultra semi-quantitative results. Although additional development could improve diagnostic accuracy, these results further support tongue swabs as easy-to-collect samples for TB testing. IMPORTANCE Tongue dorsum swabbing is a promising alternative to sputum collection for tuberculosis (TB) testing. Our results lend further support for tongue swabs as exceptionally easy-to-collect samples for high-throughput TB testing.
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Affiliation(s)
- Rachel C. Wood
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington, USA
| | - Angelique K. Luabeya
- South African Tuberculosis Vaccine Initiative, Institute of Infectious Disease & Molecular Medicine and Department of Pathology, University of Cape Town, Cape Town, South Africa
| | - Rane B. Dragovich
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington, USA
| | - Alaina M. Olson
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington, USA
| | - Katherine A. Lochner
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington, USA
| | - Kris M. Weigel
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington, USA
| | - Renée Codsi
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington, USA
| | - Humphrey Mulenga
- South African Tuberculosis Vaccine Initiative, Institute of Infectious Disease & Molecular Medicine and Department of Pathology, University of Cape Town, Cape Town, South Africa
| | | | | | | | - Mark Hatherill
- South African Tuberculosis Vaccine Initiative, Institute of Infectious Disease & Molecular Medicine and Department of Pathology, University of Cape Town, Cape Town, South Africa
| | - Gerard A. Cangelosi
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington, USA
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Williams TJ, Allen MA, Ray AE, Benaud N, Chelliah DS, Albanese D, Donati C, Selbmann L, Coleine C, Ferrari BC. Novel endolithic bacteria of phylum Chloroflexota reveal a myriad of potential survival strategies in the Antarctic desert. Appl Environ Microbiol 2024; 90:e0226423. [PMID: 38372512 PMCID: PMC10952385 DOI: 10.1128/aem.02264-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2023] [Accepted: 01/02/2024] [Indexed: 02/20/2024] Open
Abstract
The ice-free McMurdo Dry Valleys of Antarctica are dominated by nutrient-poor mineral soil and rocky outcrops. The principal habitat for microorganisms is within rocks (endolithic). In this environment, microorganisms are provided with protection against sub-zero temperatures, rapid thermal fluctuations, extreme dryness, and ultraviolet and solar radiation. Endolithic communities include lichen, algae, fungi, and a diverse array of bacteria. Chloroflexota is among the most abundant bacterial phyla present in these communities. Among the Chloroflexota are four novel classes of bacteria, here named Candidatus Spiritibacteria class. nov. (=UBA5177), Candidatus Martimicrobia class. nov. (=UBA4733), Candidatus Tarhunnaeia class. nov. (=UBA6077), and Candidatus Uliximicrobia class. nov. (=UBA2235). We retrieved 17 high-quality metagenome-assembled genomes (MAGs) that represent these four classes. Based on genome predictions, all these bacteria are inferred to be aerobic heterotrophs that encode enzymes for the catabolism of diverse sugars. These and other organic substrates are likely derived from lichen, algae, and fungi, as metabolites (including photosynthate), cell wall components, and extracellular matrix components. The majority of MAGs encode the capacity for trace gas oxidation using high-affinity uptake hydrogenases, which could provide energy and metabolic water required for survival and persistence. Furthermore, some MAGs encode the capacity to couple the energy generated from H2 and CO oxidation to support carbon fixation (atmospheric chemosynthesis). All encode mechanisms for the detoxification and efflux of heavy metals. Certain MAGs encode features that indicate possible interactions with other organisms, such as Tc-type toxin complexes, hemolysins, and macroglobulins.IMPORTANCEThe ice-free McMurdo Dry Valleys of Antarctica are the coldest and most hyperarid desert on Earth. It is, therefore, the closest analog to the surface of the planet Mars. Bacteria and other microorganisms survive by inhabiting airspaces within rocks (endolithic). We identify four novel classes of phylum Chloroflexota, and, based on interrogation of 17 metagenome-assembled genomes, we predict specific metabolic and physiological adaptations that facilitate the survival of these bacteria in this harsh environment-including oxidation of trace gases and the utilization of nutrients (including sugars) derived from lichen, algae, and fungi. We propose that such adaptations allow these endolithic bacteria to eke out an existence in this cold and extremely dry habitat.
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Affiliation(s)
- Timothy J. Williams
- School of Biotechnology and Biomolecular Sciences, UNSW Sydney, Sydney, New South Wales, Australia
| | - Michelle A. Allen
- School of Biological, Earth and Environmental Sciences, UNSW Sydney, Sydney, New South Wales, Australia
| | - Angelique E. Ray
- School of Biotechnology and Biomolecular Sciences, UNSW Sydney, Sydney, New South Wales, Australia
| | - Nicole Benaud
- School of Biotechnology and Biomolecular Sciences, UNSW Sydney, Sydney, New South Wales, Australia
| | - Devan S. Chelliah
- School of Biotechnology and Biomolecular Sciences, UNSW Sydney, Sydney, New South Wales, Australia
| | - Davide Albanese
- Research and Innovation Center, Fondazione Edmund Mach, San Michele all’Adige, Italy
| | - Claudio Donati
- Research and Innovation Center, Fondazione Edmund Mach, San Michele all’Adige, Italy
| | - Laura Selbmann
- Department of Ecological and Biological Sciences, University of Tuscia, Largo dell’Università, Viterbo, Italy
- Mycological Section, Italian Antarctic National Museum (MNA), Genova, Italy
| | - Claudia Coleine
- Department of Ecological and Biological Sciences, University of Tuscia, Largo dell’Università, Viterbo, Italy
| | - Belinda C. Ferrari
- School of Biotechnology and Biomolecular Sciences, UNSW Sydney, Sydney, New South Wales, Australia
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Mayoh C, Mao J, Xie J, Tax G, Chow SO, Cadiz R, Pazaky K, Barahona P, Ajuyah P, Trebilcock P, Malquori A, Gunther K, Avila A, Yun DY, Alfred S, Gopalakrishnan A, Kamili A, Wong M, Cowley MJ, Jessop S, Lau LM, Trahair TN, Ziegler DS, Fletcher JI, Gifford AJ, Tsoli M, Marshall GM, Haber M, Tyrrell V, Failes TW, Arndt GM, Lock RB, Ekert PG, Dolman MEM. High-Throughput Drug Screening of Primary Tumor Cells Identifies Therapeutic Strategies for Treating Children with High-Risk Cancer. Cancer Res 2023; 83:2716-2732. [PMID: 37523146 PMCID: PMC10425737 DOI: 10.1158/0008-5472.can-22-3702] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Revised: 04/10/2023] [Accepted: 06/02/2023] [Indexed: 08/01/2023]
Abstract
For one-third of patients with pediatric cancer enrolled in precision medicine programs, molecular profiling does not result in a therapeutic recommendation. To identify potential strategies for treating these high-risk pediatric patients, we performed in vitro screening of 125 patient-derived samples against a library of 126 anticancer drugs. Tumor cell expansion did not influence drug responses, and 82% of the screens on expanded tumor cells were completed while the patients were still under clinical care. High-throughput drug screening (HTS) confirmed known associations between activating genomic alterations in NTRK, BRAF, and ALK and responses to matching targeted drugs. The in vitro results were further validated in patient-derived xenograft models in vivo and were consistent with clinical responses in treated patients. In addition, effective combinations could be predicted by correlating sensitivity profiles between drugs. Furthermore, molecular integration with HTS identified biomarkers of sensitivity to WEE1 and MEK inhibition. Incorporating HTS into precision medicine programs is a powerful tool to accelerate the improved identification of effective biomarker-driven therapeutic strategies for treating high-risk pediatric cancers. SIGNIFICANCE Integrating HTS with molecular profiling is a powerful tool for expanding precision medicine to support drug treatment recommendations and broaden the therapeutic options available to high-risk pediatric cancers.
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Affiliation(s)
- Chelsea Mayoh
- Children's Cancer Institute, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia
- School of Clinical Medicine, UNSW Medicine & Health, UNSW Sydney, Kensington, New South Wales, Australia
| | - Jie Mao
- Children's Cancer Institute, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia
| | - Jinhan Xie
- Children's Cancer Institute, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia
- School of Clinical Medicine, UNSW Medicine & Health, UNSW Sydney, Kensington, New South Wales, Australia
| | - Gabor Tax
- Children's Cancer Institute, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia
- School of Clinical Medicine, UNSW Medicine & Health, UNSW Sydney, Kensington, New South Wales, Australia
| | - Shu-Oi Chow
- Children's Cancer Institute, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia
- ACRF Drug Discovery Centre for Childhood Cancer, Children's Cancer Institute, Lowy Cancer Research Centre, UNSW Sydney, Sydney, New South Wales, Australia
| | - Roxanne Cadiz
- Children's Cancer Institute, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia
| | - Karina Pazaky
- Children's Cancer Institute, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia
| | - Paulette Barahona
- Children's Cancer Institute, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia
| | - Pamela Ajuyah
- Children's Cancer Institute, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia
| | - Peter Trebilcock
- Children's Cancer Institute, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia
| | - Angela Malquori
- Children's Cancer Institute, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia
| | - Kate Gunther
- Children's Cancer Institute, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia
| | - Anica Avila
- Children's Cancer Institute, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia
| | - Doo Young Yun
- Children's Cancer Institute, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia
| | - Stephanie Alfred
- Children's Cancer Institute, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia
| | - Anjana Gopalakrishnan
- Children's Cancer Institute, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia
| | - Alvin Kamili
- Children's Cancer Institute, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia
- School of Clinical Medicine, UNSW Medicine & Health, UNSW Sydney, Kensington, New South Wales, Australia
| | - Marie Wong
- Children's Cancer Institute, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia
| | - Mark J. Cowley
- Children's Cancer Institute, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia
- School of Clinical Medicine, UNSW Medicine & Health, UNSW Sydney, Kensington, New South Wales, Australia
| | - Sophie Jessop
- Children's Cancer Institute, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia
- Kids Cancer Centre, Sydney Children's Hospital, Randwick, New South Wales, Australia
| | - Loretta M.S. Lau
- Children's Cancer Institute, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia
- School of Clinical Medicine, UNSW Medicine & Health, UNSW Sydney, Kensington, New South Wales, Australia
- Kids Cancer Centre, Sydney Children's Hospital, Randwick, New South Wales, Australia
| | - Toby N. Trahair
- Children's Cancer Institute, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia
- School of Clinical Medicine, UNSW Medicine & Health, UNSW Sydney, Kensington, New South Wales, Australia
- Kids Cancer Centre, Sydney Children's Hospital, Randwick, New South Wales, Australia
| | - David S. Ziegler
- Children's Cancer Institute, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia
- School of Clinical Medicine, UNSW Medicine & Health, UNSW Sydney, Kensington, New South Wales, Australia
- Kids Cancer Centre, Sydney Children's Hospital, Randwick, New South Wales, Australia
| | - Jamie I. Fletcher
- Children's Cancer Institute, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia
- School of Clinical Medicine, UNSW Medicine & Health, UNSW Sydney, Kensington, New South Wales, Australia
| | - Andrew J. Gifford
- Children's Cancer Institute, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia
- School of Clinical Medicine, UNSW Medicine & Health, UNSW Sydney, Kensington, New South Wales, Australia
- Anatomical Pathology, NSW Health Pathology, Prince of Wales Hospital, Randwick, New South Wales, Australia
| | - Maria Tsoli
- Children's Cancer Institute, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia
- School of Clinical Medicine, UNSW Medicine & Health, UNSW Sydney, Kensington, New South Wales, Australia
| | - Glenn M. Marshall
- Children's Cancer Institute, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia
- School of Clinical Medicine, UNSW Medicine & Health, UNSW Sydney, Kensington, New South Wales, Australia
- Kids Cancer Centre, Sydney Children's Hospital, Randwick, New South Wales, Australia
| | - Michelle Haber
- Children's Cancer Institute, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia
- School of Clinical Medicine, UNSW Medicine & Health, UNSW Sydney, Kensington, New South Wales, Australia
| | - Vanessa Tyrrell
- Children's Cancer Institute, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia
- School of Clinical Medicine, UNSW Medicine & Health, UNSW Sydney, Kensington, New South Wales, Australia
| | - Timothy W. Failes
- Children's Cancer Institute, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia
- ACRF Drug Discovery Centre for Childhood Cancer, Children's Cancer Institute, Lowy Cancer Research Centre, UNSW Sydney, Sydney, New South Wales, Australia
| | - Greg M. Arndt
- Children's Cancer Institute, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia
- School of Clinical Medicine, UNSW Medicine & Health, UNSW Sydney, Kensington, New South Wales, Australia
- ACRF Drug Discovery Centre for Childhood Cancer, Children's Cancer Institute, Lowy Cancer Research Centre, UNSW Sydney, Sydney, New South Wales, Australia
| | - Richard B. Lock
- Children's Cancer Institute, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia
- School of Clinical Medicine, UNSW Medicine & Health, UNSW Sydney, Kensington, New South Wales, Australia
| | - Paul G. Ekert
- Children's Cancer Institute, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia
- School of Clinical Medicine, UNSW Medicine & Health, UNSW Sydney, Kensington, New South Wales, Australia
- Murdoch Children's Research Institute, Royal Children's Hospital, Parkville, Victoria, Australia
- Cancer Immunology Program, Peter MacCallum Cancer Centre, Melbourne, Victoria, Australia
- The Sir Peter MacCallum Department of Oncology, The University of Melbourne, Victoria, Australia
| | - M. Emmy M. Dolman
- Children's Cancer Institute, Lowy Cancer Research Centre, UNSW Sydney, Kensington, New South Wales, Australia
- School of Clinical Medicine, UNSW Medicine & Health, UNSW Sydney, Kensington, New South Wales, Australia
- Princess Máxima Center for Pediatric Oncology, Utrecht, the Netherlands
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Wilde ML, Ruparel U, Klemm T, Lee VV, Calleja DJ, Komander D, Tonkin CJ. Characterisation of the OTU domain deubiquitinase complement of Toxoplasma gondii. Life Sci Alliance 2023; 6:e202201710. [PMID: 36958824 PMCID: PMC10038098 DOI: 10.26508/lsa.202201710] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2022] [Revised: 03/15/2023] [Accepted: 03/15/2023] [Indexed: 03/25/2023] Open
Abstract
The phylum Apicomplexa contains several parasitic species of medical and agricultural importance. The ubiquitination machinery remains, for the most part, uncharacterised in apicomplexan parasites, despite the important roles that it plays in eukaryotic biology. Bioinformatic analysis of the ubiquitination machinery in apicomplexan parasites revealed an expanded ovarian tumour domain-containing (OTU) deubiquitinase (DUB) family in Toxoplasma, potentially reflecting functional importance in apicomplexan parasites. This study presents comprehensive characterisation of Toxoplasma OTU DUBs. AlphaFold-guided structural analysis not only confirmed functional orthologues found across eukaryotes, but also identified apicomplexan-specific enzymes, subsequently enabling discovery of a cryptic OTU DUB in Plasmodium species. Comprehensive biochemical characterisation of 11 Toxoplasma OTU DUBs revealed activity against ubiquitin- and NEDD8-based substrates and revealed ubiquitin linkage preferences for Lys6-, Lys11-, Lys48-, and Lys63-linked chain types. We show that accessory domains in Toxoplasma OTU DUBs impose linkage preferences, and in case of apicomplexan-specific TgOTU9, we discover a cryptic ubiquitin-binding domain that is essential for TgOTU9 activity. Using the auxin-inducible degron (AID) to generate knockdown parasite lines, TgOTUD6B was found to be important for Toxoplasma growth.
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Affiliation(s)
- Mary-Louise Wilde
- Walter and Eliza Hall Institute of Medical Research, Parkville, Australia; and Department of Medical Biology, University of Melbourne, Melbourne, Australia
| | - Ushma Ruparel
- Walter and Eliza Hall Institute of Medical Research, Parkville, Australia; and Department of Medical Biology, University of Melbourne, Melbourne, Australia
| | - Theresa Klemm
- Walter and Eliza Hall Institute of Medical Research, Parkville, Australia; and Department of Medical Biology, University of Melbourne, Melbourne, Australia
| | - V Vern Lee
- Walter and Eliza Hall Institute of Medical Research, Parkville, Australia; and Department of Medical Biology, University of Melbourne, Melbourne, Australia
- Bio21 Molecular Science and Biotechnology Institute, Parkville, Australia; and Department of Biochemistry and Pharmacology, The University of Melbourne, Melbourne, Australia
| | - Dale J Calleja
- Walter and Eliza Hall Institute of Medical Research, Parkville, Australia; and Department of Medical Biology, University of Melbourne, Melbourne, Australia
| | - David Komander
- Walter and Eliza Hall Institute of Medical Research, Parkville, Australia; and Department of Medical Biology, University of Melbourne, Melbourne, Australia
| | - Christopher J Tonkin
- Walter and Eliza Hall Institute of Medical Research, Parkville, Australia; and Department of Medical Biology, University of Melbourne, Melbourne, Australia
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Sandaradura I, Wojciechowski J, Marriott DJE, Day RO, Stocker S, Reuter SE. Model-Optimized Fluconazole Dose Selection for Critically Ill Patients Improves Early Pharmacodynamic Target Attainment without the Need for Therapeutic Drug Monitoring. Antimicrob Agents Chemother 2021; 65:e02019-20. [PMID: 33361309 PMCID: PMC8092533 DOI: 10.1128/aac.02019-20] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2020] [Accepted: 12/20/2020] [Indexed: 12/19/2022] Open
Abstract
Fluconazole has been associated with higher mortality compared with the echinocandins in patients treated for invasive candida infections. Underexposure from current fluconazole dosing regimens may contribute to these worse outcomes, so alternative dosing strategies require study. The objective of this study was to evaluate fluconazole drug exposure in critically ill patients comparing a novel model-optimized dose selection method with established approaches over a standard 14-day (336-h) treatment course. Target attainment was evaluated in a representative population of 1,000 critically ill adult patients for (i) guideline dosing (800-mg loading and 400-mg maintenance dosing adjusted to renal function), (ii) guideline dosing followed by therapeutic drug monitoring (TDM)-guided dose adjustment, and (iii) model-optimized dose selection based on patient factors (without TDM). Assuming a MIC of 2 mg/liter, free fluconazole 24-h area under the curve (fAUC24) targets of ≥200 mg · h/liter and <800 mg · h/liter were used for assessment of target attainment. Guideline dosing resulted in underexposure in 21% of patients at 48 h and in 23% of patients at 336 h. The TDM-guided strategy did not influence 0- to 48-h target attainment due to inherent procedural delays but resulted in 37% of patients being underexposed at 336 h. Model-optimized dosing resulted in ≥98% of patients meeting efficacy targets throughout the treatment course, while resulting in less overexposure compared with guideline dosing (7% versus 14%) at 336 h. Model-optimized dose selection enables fluconazole dose individualization in critical illness from the outset of therapy and should enable reevaluation of the comparative effectiveness of this drug in patients with severe fungal infections.
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Affiliation(s)
- Indy Sandaradura
- Centre for Infectious Diseases and Microbiology, Westmead Hospital, Sydney, NSW, Australia
- Department of Microbiology, St Vincent's Hospital, Sydney, NSW, Australia
- St Vincent's Clinical School, University of New South Wales, Sydney, NSW, Australia
- School of Medicine, University of Sydney, NSW, Australia
| | | | - Deborah J E Marriott
- Department of Microbiology, St Vincent's Hospital, Sydney, NSW, Australia
- St Vincent's Clinical School, University of New South Wales, Sydney, NSW, Australia
| | - Richard O Day
- St Vincent's Clinical School, University of New South Wales, Sydney, NSW, Australia
- Clinical Pharmacology & Toxicology, St Vincent's Hospital, Sydney, NSW, Australia
| | - Sophie Stocker
- St Vincent's Clinical School, University of New South Wales, Sydney, NSW, Australia
- Clinical Pharmacology & Toxicology, St Vincent's Hospital, Sydney, NSW, Australia
| | - Stephanie E Reuter
- UniSA Clinical & Health Sciences, University of South Australia, Adelaide, SA, Australia
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