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Pharmacogenetic Aspects of Drug Metabolizing Enzymes and Transporters in Pediatric Medicine: Study Progress, Clinical Practice and Future Perspectives. Paediatr Drugs 2023; 25:301-319. [PMID: 36707496 DOI: 10.1007/s40272-023-00560-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 01/09/2023] [Indexed: 01/28/2023]
Abstract
As the activity of certain drug metabolizing enzymes or transporter proteins can vary with age, the effect of ontogenetic and genetic variation on the activity of these enzymes is critical for the accurate prediction of treatment outcomes and toxicity in children. This makes pharmacogenetic research in pediatrics particularly important and urgently needed, but also challenging. This review summarizes pharmacogenetic studies on the effects of genetic polymorphisms on pharmacokinetic parameters and clinical outcomes in pediatric populations for certain drugs, which are commonly prescribed by clinicians across multiple therapeutic areas in a general hospital, organized from those with the most to the least pediatric evidence among each drug category. We also further discuss the research status of the gene-guided dosing regimens and clinical implementation of pediatric pharmacogenetics. More and more drug-gene interactions are demonstrated to have clinical validity for children, and pharmacogenomics in pediatrics have shown evidence-based benefits to enhance the efficacy and precision of existing drug dosing regimens in several therapeutic areas. However, the most important limitation to the implementation is the lack of high-quality, rigorous pediatric prospective clinical studies, so adequately powered interventional clinical trials that support incorporation of pharmacogenetics into the care of children are still needed.
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Challenges in the Treatment of Invasive Aspergillosis in Immunocompromised Children. Antimicrob Agents Chemother 2022; 66:e0215621. [PMID: 35766509 PMCID: PMC9295552 DOI: 10.1128/aac.02156-21] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Invasive aspergillosis (IA) is associated with significant morbidity and mortality. Voriconazole remains the drug of choice for the treatment of IA in children; however, the complex kinetics of voriconazole in children make dosing challenging and therapeutic drug monitoring (TDM) essential for treatment success. The overarching goal of this review is to discuss the role of voriconazole, posaconazole, isavuconazole, liposomal amphotericin B, echinocandins, and combination antifungal therapy for the treatment of IA in children. We also provide a detailed discussion of antifungal TDM in children.
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Lindsay J, Krantz EM, Morris J, Sweet A, Tverdek F, Joshi A, Yeh R, Hill JA, Greenwood M, Chen SCA, Kong DCM, Slavin M, Pergam SA, Liu C. Voriconazole in hematopoietic stem cell transplantation and cellular therapies: Real-world usage and therapeutic level attainment at a major transplant center. Transplant Cell Ther 2022; 28:511.e1-511.e10. [PMID: 35623614 DOI: 10.1016/j.jtct.2022.05.030] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Revised: 05/17/2022] [Accepted: 05/18/2022] [Indexed: 11/16/2022]
Abstract
BACKGROUND Voriconazole (VCZ) was one of the first mold-active triazoles available; however, its current use among high-risk hematology populations is unknown as the uptake of posaconazole (PCZ) and isavuconazole (ISZ) increases. OBJECTIVES We evaluated the usage and therapeutic level attainment of VCZ in hematopoietic cell transplant (HCT) and chimeric antigen receptor T cell (CAR-T) therapy patients at our cancer center. STUDY DESIGN Electronic medical records for all adult HCT or CAR-T patients with an order for VCZ, PCZ or ISV between January 1, 2018, and June 30, 2020 were extracted. Clinical characteristics, VCZ indication, trough VCZ levels, and frequency of VCZ initiation from 6 months pre- to 6 months post HCT/CAR-T infusion in consecutive HCT/CAR-T recipients within the study period (infusion between July 1, 2018, and January 1, 2020) were assessed. The association between relevant clinical characteristics and the attainment of sub- or supratherapeutic levels was also evaluated. RESULTS Of 468 patients prescribed mold-active triazoles, 256 (54.7%) were prescribed VCZ, 324 (69.2%) PCZ, and 60 (12.8%) ISZ; 152/468 (32.5%) treatment regimens were sequentially modified to alternate mold-active triazoles. Among consecutive HCT and CAR-T recipients at our center, evaluated 6 months pre- or post- HCT/ CAR-T, VCZ was commonly initiated pre- or post-allogeneic HCT (102/381, 26.8%), with most use in the first 30 days post stem cell infusion (40/381, 10.5%); VCZ use was less common in autologous HCT (13/276, 4.7%) and CAR-T (10/153, 6.5%). Of 223 VCZ orders that met inclusion for analysis, indications included empiric treatment in 108/223 (48.4%), directed therapy in 25/223 (11.2%), primary prophylaxis in 69/223 (30.9%) and secondary prophylaxis in 21/223 (9.4%). Of 223 eligible VCZ patients, 144 (64.6%) had at least one VCZ level measured during the study period; 75/144 (52.1%) had a therapeutic VCZ level (1.0-5.5mg/L) at the first measurement (median 2.8mg/L [range 0.1 - 13.5]) at a median of 6 days of therapy, with 26.4% subtherapeutic and 21.5% supratherapeutic; 46/88 (52.3%) were therapeutic at the second measurement (2.1mg/L [0.1 - 9.9]) at a median of 17 days of therapy; and 33/48 (68.8%) at the third (2.3mg/L [0.1 - 7.7]) at a median of 29 days. In multivariable analysis of factors associated with sub- or supratherapeutic levels (body mass index ≥30, concurrent omeprazole use, concurrent letermovir use, indication for VCZ, history/timeframe of HCT), the only significant association was lower odds of a supratherapeutic VCZ level among those undergoing HCT within the previous 30 days compared to those without a history of HCT. CONCLUSIONS VCZ continues to remain an important option in the treatment and prevention of invasive fungal infections in an era when alternative oral mold-active triazoles are available. In spite of long-standing experience with VCZ prescribing, therapeutic level attainment remains a challenge.
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Affiliation(s)
- Julian Lindsay
- Vaccine and Infectious Disease and Clinical Research Division, Fred Hutchinson Cancer Center, Seattle, Washington, United States of America; National Centre for Infection in Cancer (NCIC), Peter MacCallum Cancer Centre, Melbourne, Australia.
| | - Elizabeth M Krantz
- Vaccine and Infectious Disease and Clinical Research Division, Fred Hutchinson Cancer Center, Seattle, Washington, United States of America
| | - Jessica Morris
- Vaccine and Infectious Disease and Clinical Research Division, Fred Hutchinson Cancer Center, Seattle, Washington, United States of America
| | - Ania Sweet
- Vaccine and Infectious Disease and Clinical Research Division, Fred Hutchinson Cancer Center, Seattle, Washington, United States of America
| | - Frank Tverdek
- Vaccine and Infectious Disease and Clinical Research Division, Fred Hutchinson Cancer Center, Seattle, Washington, United States of America; Department of Pharmacy, University of Washington, Fred Hutchinson Cancer Center, Seattle, Washington, United States of America
| | - Avadhut Joshi
- Pharmacokinetics Laboratory, Fred Hutchinson Cancer Center, Seattle, Washington, United States of America
| | - Rosa Yeh
- Pharmacokinetics Laboratory, Fred Hutchinson Cancer Center, Seattle, Washington, United States of America
| | - Joshua A Hill
- Vaccine and Infectious Disease and Clinical Research Division, Fred Hutchinson Cancer Center, Seattle, Washington, United States of America; Division of Allergy & Infectious Diseases, University of Washington, Seattle, Washington, United States of America
| | - Matthew Greenwood
- Haematology Department, Royal North Shore Hospital, Sydney, Australia; Northern Blood Research Centre, Kolling Institute of Medical Research, University of Sydney, Sydney, New South Wales, Australia
| | - Sharon C-A Chen
- National Centre for Infection in Cancer (NCIC), Peter MacCallum Cancer Centre, Melbourne, Australia; Centre for Infectious Diseases and Microbiology Laboratory Services, Institute of Clinical Pathology and Medical Research, New South Wales Health Pathology, Westmead Hospital, The University of Sydney, and the Marie Bashir Institute for Infectious Diseases and Biosecurity, The University of Sydney, Sydney, Australia
| | - David C M Kong
- NHMRC National Centre for Antimicrobial Stewardship at The Peter Doherty Institute for Infections and Immunity, Parkville, Victoria, Australia; Centre for Medicine Use and Safety, Monash Institute of Pharmaceutical Sciences, Faculty of Pharmacy and Pharmaceutical Sciences, Monash University, Parkville, Victoria, Australia; Pharmacy Department, Ballarat Health Services, Ballarat, Victoria, Australia
| | - Monica Slavin
- National Centre for Infection in Cancer (NCIC), Peter MacCallum Cancer Centre, Melbourne, Australia; Department of Infectious Diseases, Peter MacCallum Cancer Centre, Melbourne, Australia; Sir Peter MacCallum Department of Oncology, University of Melbourne, Parkville, Australia
| | - Steven A Pergam
- Vaccine and Infectious Disease and Clinical Research Division, Fred Hutchinson Cancer Center, Seattle, Washington, United States of America; Division of Allergy & Infectious Diseases, University of Washington, Seattle, Washington, United States of America
| | - Catherine Liu
- Vaccine and Infectious Disease and Clinical Research Division, Fred Hutchinson Cancer Center, Seattle, Washington, United States of America; Division of Allergy & Infectious Diseases, University of Washington, Seattle, Washington, United States of America
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Voriconazole-Induced Hepatotoxicity Concise up-to-date review. JOURNAL OF BASIC AND CLINICAL HEALTH SCIENCES 2022. [DOI: 10.30621/jbachs.1051669] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Chen J, Wu Y, He Y, Feng X, Ren Y, Liu S. Combined Effect of CYP2C19 Genetic Polymorphisms and C-Reactive Protein on Voriconazole Exposure and Dosing in Immunocompromised Children. Front Pediatr 2022; 10:846411. [PMID: 35386257 PMCID: PMC8978631 DOI: 10.3389/fped.2022.846411] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/31/2021] [Accepted: 02/09/2022] [Indexed: 12/26/2022] Open
Abstract
BACKGROUND Pediatric patients have significant interindividual variability in voriconazole exposure. The aim of the study was to identify factors associated with voriconazole concentrations and dose requirements to achieve therapeutic concentrations in pediatric patients. METHODS Medical records of pediatric patients were retrospectively reviewed. Covariates associated with voriconazole plasma concentrations and dose requirements were adjusted by using generalized linear mixed-effect models. RESULTS A total of 682 voriconazole steady-state trough concentrations from 91 Chinese pediatric patients were included. Voriconazole exposure was lower in the CYP2C19 normal metabolizer (NM) group compared with the intermediate metabolizer (IM) group and the poor metabolizer (PM) group (p = 0.0016, p < 0.0001). The median daily dose of voriconazole required to achieve therapeutic range demonstrated a significant phenotypic dose effect: 20.8 mg/kg (range, 16.2-26.8 mg/kg) for the CYP2C19 NM group, 18.2 mg/kg (range, 13.3-21.8 mg/kg) for the CYP2C19 IM group, and 15.2 mg/kg (range, 10.7-19.1 mg/kg) for the CYP2C19 PM group, respectively. The extent of impact of C-reactive protein (CRP) levels on voriconazole trough concentrations and dose requirements varied between CYP2C19 phenotypes. Increases of 20, 120, 245, and 395 mg/L from 5 mg/L in CRP levels were associated with increases in voriconazole trough concentration by 22.22, 50, 64.81, and 75% respectively, in the NM group; by 39.26, 94.48, 123.93, and 146.63%, respectively, in the IM group; and by 17.17, 37.34, 46.78, and 53.65%, respectively, in the PM group. Meanwhile, increases of 20, 120, 245, and 395 mg/L from 5 mg/L in CRP levels were associated with increases in voriconazole dose requirements by 7.15, 14.23, 17.35, and 19.43%, respectively, in the PM group; with decreases in voriconazole dose requirements by 3.71, 7.38, 8.97, and 10.03%, respectively, in the NM group; and with decreases by 4, 9.10, 11.05, and 12.35%, respectively, in the IM group. In addition, age and presence of immunosuppressants had significant effects on voriconazole exposure. CONCLUSIONS Our study suggests that CYP2C19 phenotypes, CRP concentrations, age, and the presence of immunosuppressants were factors associated with the pharmacokinetic changes in voriconazole. There was heterogeneity in the effect of CRP on voriconazole plasma concentrations across different CYP2C19 genotypes. Combining relevant factors with dose adaptation strategies in therapeutic drug monitoring may help to reduce the incidence of subtherapeutic and supratherapeutic concentrations in clinical practice.
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Affiliation(s)
- Juan Chen
- Department of Pharmacy, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Ying Wu
- Department of Biostatistics, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou, China
| | - Yuelin He
- Department of Pediatrics, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Xiaoqin Feng
- Department of Pediatrics, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Yuqiong Ren
- Department of Pediatrics, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Shiting Liu
- Department of Pharmacy, Nanfang Hospital, Southern Medical University, Guangzhou, China
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Resztak M, Sobiak J, Czyrski A. Recent Advances in Therapeutic Drug Monitoring of Voriconazole, Mycophenolic Acid, and Vancomycin: A Literature Review of Pediatric Studies. Pharmaceutics 2021; 13:1991. [PMID: 34959272 PMCID: PMC8707246 DOI: 10.3390/pharmaceutics13121991] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Revised: 11/02/2021] [Accepted: 11/18/2021] [Indexed: 01/05/2023] Open
Abstract
The review includes studies dated 2011-2021 presenting the newest information on voriconazole (VCZ), mycophenolic acid (MPA), and vancomycin (VAN) therapeutic drug monitoring (TDM) in children. The need of TDM in pediatric patients has been emphasized by providing the information on the differences in the drugs pharmacokinetics. TDM of VCZ should be mandatory for all pediatric patients with invasive fungal infections (IFIs). Wide inter- and intrapatient variability in VCZ pharmacokinetics cause achieving and maintaining therapeutic concentration during therapy challenging in this population. Demonstrated studies showed, in most cases, VCZ plasma concentrations to be subtherapeutic, despite the updated dosages recommendations. Only repeated TDM can predict drug exposure and individualizing dosing in antifungal therapy in children. In children treated with mycophenolate mofetil (MMF), similarly as in adult patients, the role of TDM for MMF active form, MPA, has not been well established and is undergoing continued debate. Studies on the MPA TDM have been carried out in children after renal transplantation, other organ transplantation such as heart, liver, or intestine, in children after hematopoietic stem cell transplantation or cord blood transplantation, and in children with lupus, nephrotic syndrome, Henoch-Schönlein purpura, and other autoimmune diseases. MPA TDM is based on the area under the concentration-time curve; however, the proposed values differ according to the treatment indication, and other approaches such as pharmacodynamic and pharmacogenetic biomarkers have been proposed. VAN is a bactericidal agent that requires TDM to prevent an acute kidney disease. The particular group of patients is the pediatric one. For this group, the general recommendations of the dosing may not be valid due to the change of the elimination rate and volume of distribution between the subjects. The other factor is the variability among patients that concerns the free fraction of the drug. It may be caused by both the patients' population and sample preconditioning. Although VCZ, MMF, and VAN have been applied in pediatric patients for many years, there are still few issues to be solve regarding TDM of these drugs to ensure safe and effective treatment. Except for pharmacokinetic approach, pharmacodynamics and pharmacogenetics have been more often proposed for TDM.
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Affiliation(s)
- Matylda Resztak
- Department of Physical Pharmacy and Pharmacokinetics, Poznan University of Medical Sciences, 6 Święcickiego Street, 60-781 Poznań, Poland; (J.S.); (A.C.)
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Friend BD, Schiller GJ. Beyond steroids: A systematic review and proposed solutions to managing acute graft-versus-host disease in adolescents and young adults. Blood Rev 2021; 52:100886. [PMID: 34509319 DOI: 10.1016/j.blre.2021.100886] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Revised: 08/18/2021] [Accepted: 08/26/2021] [Indexed: 12/11/2022]
Abstract
The outcomes of allogeneic hematopoietic cell transplantation (HCT) in adolescents and young adults (AYAs) with hematologic malignancies have been shown to be poorer when compared to results in children, due to a combination of higher relapse rates and greater treatment-related mortality (TRM). Although differences in relapse risk have been studied extensively, toxicity has been examined and reported less often. In this systematic review, we summarize recently published studies that have examined the differences in rates of TRM and acute graft-versus-host disease (GVHD) in AYAs and children with hematologic malignancies, and attempt to explain why these disparities exist and how they impact outcomes. In addition, we present best practices for management of steroid-refractory GVHD that are likely to improve survival in this patient population. Further, we propose the development of personalized, risk-based approaches for the prevention and treatment of GVHD that incorporate novel platforms and interventions. We believe this individualized approach is likely to reduce toxicity and greatly improve outcomes for this vulnerable population.
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Affiliation(s)
- Brian D Friend
- Department of Pediatrics, Center for Cell and Gene Therapy, Baylor College of Medicine, Texas Children's Hospital, 1102 Bates Ave, Suite 1630, Houston, TX 77030, USA.
| | - Gary J Schiller
- Department of Medicine, Division of Hematology-Oncology, University of California Los Angeles, 10833 Le Conte Ave, 42-121 CHS, Los Angeles, CA 90095, USA.
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Gautier-Veyret E, Thiebaut-Bertrand A, Roustit M, Bolcato L, Depeisses J, Schacherer M, Schummer G, Fonrose X, Stanke-Labesque F. Optimization of voriconazole therapy for treatment of invasive aspergillosis: Pharmacogenomics and inflammatory status need to be evaluated. Br J Clin Pharmacol 2020; 87:2534-2541. [PMID: 33217017 DOI: 10.1111/bcp.14661] [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: 07/24/2020] [Revised: 11/04/2020] [Accepted: 11/11/2020] [Indexed: 12/13/2022] Open
Abstract
AIMS Cytochrome 2C19 genotype-directed dosing of voriconazole (VRC) reduces the incidence of insufficient VRC trough concentrations (Cmin ) but does not account for CYP3A polymorphisms, also involved in VRC metabolism. This prospective observational study aimed to evaluate the utility of a genetic score combining CYP2C19 and CYP3A genotypes to predict insufficient initial VRC Cmin (<1 mg/L). METHODS The genetic score was determined in hematological patients treated with VRC. The higher the genetic score, the faster the metabolism of the patient. The impact of the genetic score was evaluated considering initial VRC Cmin and all VRC Cmin (n = 159) determined during longitudinal therapeutic drug monitoring. RESULTS Forty-three patients were included, of whom 41 received VRC for curative indication. Thirty-six patients had a genetic score ≥2, of whom 11 had an initial insufficient VRC Cmin . A genetic score ≥2 had a positive predictive value of 0.31 for having an initial insufficient VRC Cmin and initial VRC Cmin was not associated with the genetic score. The lack of association between the genetic score and VRC Cmin may be related to the inflammatory status of the patients (C-reactive protein [CRP] levels: median [Q1-Q3]: 43.0 [11.0-110.0] mg/L), as multivariate analysis performed on all VRC Cmin identified CRP as an independent determinant of the VRC Cmin adjusted for dose (P < .0001). CONCLUSION The combined genetic score did not predict low VRC exposure in patients with inflammation, which is frequent in patients with invasive fungal infections. Strategies for the individualization of VRC dose should integrate the inflammatory status of patients in addition to pharmacogenetic variants.
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Affiliation(s)
- Elodie Gautier-Veyret
- Inserm, CHU Grenoble Alpes, HP2, Universitaire Grenoble Alpes, Grenoble, 38000, France
| | | | - Matthieu Roustit
- Inserm, CHU Grenoble Alpes, HP2, Universitaire Grenoble Alpes, Grenoble, 38000, France
| | - Léa Bolcato
- Laboratoire de Pharmacologie, Pharmacogénétique et Toxicologie, CHU Grenoble Alpes, France
| | | | | | - Gabriel Schummer
- Univ. Grenoble Alpes, Inserm, CHU Grenoble Alpes, HP2, Grenoble, France
| | - Xavier Fonrose
- Laboratoire de Pharmacologie, Pharmacogénétique et Toxicologie, CHU Grenoble Alpes, France
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Ramsey LB, Ong HH, Schildcrout JS, Shi Y, Tang LA, Hicks JK, El Rouby N, Cavallari LH, Tuteja S, Aquilante CL, Beitelshees AL, Lemkin DL, Blake KV, Williams H, Cimino JJ, Davis BH, Limdi NA, Empey PE, Horvat CM, Kao DP, Lipori GP, Rosenman MB, Skaar TC, Teal E, Winterstein AG, Owusu Obeng A, Salyakina D, Gupta A, Gruber J, McCafferty-Fernandez J, Bishop JR, Rivers Z, Benner A, Tamraz B, Long-Boyle J, Peterson JF, Van Driest SL. Prescribing Prevalence of Medications With Potential Genotype-Guided Dosing in Pediatric Patients. JAMA Netw Open 2020; 3:e2029411. [PMID: 33315113 PMCID: PMC7737091 DOI: 10.1001/jamanetworkopen.2020.29411] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
IMPORTANCE Genotype-guided prescribing in pediatrics could prevent adverse drug reactions and improve therapeutic response. Clinical pharmacogenetic implementation guidelines are available for many medications commonly prescribed to children. Frequencies of medication prescription and actionable genotypes (genotypes where a prescribing change may be indicated) inform the potential value of pharmacogenetic implementation. OBJECTIVE To assess potential opportunities for genotype-guided prescribing in pediatric populations among multiple health systems by examining the prevalence of prescriptions for each drug with the highest level of evidence (Clinical Pharmacogenetics Implementation Consortium level A) and estimating the prevalence of potential actionable prescribing decisions. DESIGN, SETTING, AND PARTICIPANTS This serial cross-sectional study of prescribing prevalences in 16 health systems included electronic health records data from pediatric inpatient and outpatient encounters from January 1, 2011, to December 31, 2017. The health systems included academic medical centers with free-standing children's hospitals and community hospitals that were part of an adult health care system. Participants included approximately 2.9 million patients younger than 21 years observed per year. Data were analyzed from June 5, 2018, to April 14, 2020. EXPOSURES Prescription of 38 level A medications based on electronic health records. MAIN OUTCOMES AND MEASURES Annual prevalence of level A medication prescribing and estimated actionable exposures, calculated by combining estimated site-year prevalences across sites with each site weighted equally. RESULTS Data from approximately 2.9 million pediatric patients (median age, 8 [interquartile range, 2-16] years; 50.7% female, 62.3% White) were analyzed for a typical calendar year. The annual prescribing prevalence of at least 1 level A drug ranged from 7987 to 10 629 per 100 000 patients with increasing trends from 2011 to 2014. The most prescribed level A drug was the antiemetic ondansetron (annual prevalence of exposure, 8107 [95% CI, 8077-8137] per 100 000 children). Among commonly prescribed opioids, annual prevalence per 100 000 patients was 295 (95% CI, 273-317) for tramadol, 571 (95% CI, 557-586) for codeine, and 2116 (95% CI, 2097-2135) for oxycodone. The antidepressants citalopram, escitalopram, and amitriptyline were also commonly prescribed (annual prevalence, approximately 250 per 100 000 patients for each). Estimated prevalences of actionable exposures were highest for oxycodone and ondansetron (>300 per 100 000 patients annually). CYP2D6 and CYP2C19 substrates were more frequently prescribed than medications influenced by other genes. CONCLUSIONS AND RELEVANCE These findings suggest that opportunities for pharmacogenetic implementation among pediatric patients in the US are abundant. As expected, the greatest opportunity exists with implementing CYP2D6 and CYP2C19 pharmacogenetic guidance for commonly prescribed antiemetics, analgesics, and antidepressants.
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Affiliation(s)
- Laura B. Ramsey
- Department of Pediatrics, College of Medicine, University of Cincinnati, Cincinnati, Ohio
- Divisions of Research in Patient Services and Clinical Pharmacology, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio
| | - Henry H. Ong
- Vanderbilt Institute for Clinical and Translational Research, Vanderbilt University Medical Center, Nashville, Tennessee
| | | | - Yaping Shi
- Department of Biostatistics, Vanderbilt University Medical Center, Nashville, Tennessee
| | - Leigh Anne Tang
- Department of Biomedical Informatics, Vanderbilt University Medical Center, Nashville, Tennessee
| | - J. Kevin Hicks
- Department of Individualized Cancer Management, H. Lee Moffitt Cancer Center and Research Institute, Tampa, Florida
| | - Nihal El Rouby
- Department of Pharmacotherapy and Translational Research, University of Florida, Gainesville
- James Winkle College of Pharmacy, University of Cincinnati, Cincinnati, Ohio
| | - Larisa H. Cavallari
- Department of Pharmacotherapy and Translational Research, University of Florida, Gainesville
| | - Sony Tuteja
- Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia
| | | | | | - Daniel L. Lemkin
- Department of Emergency Medicine, University of Maryland, Baltimore
| | - Kathryn V. Blake
- Center for Pharmacogenomics and Translational Research, Nemours Children’s Health System, Jacksonville, Florida
| | - Helen Williams
- Nemours Research Institute, Nemours Children’s Health System, Jacksonville, Florida
| | | | | | - Nita A. Limdi
- Department of Neurology, University of Alabama at Birmingham
| | - Philip E. Empey
- Department of Pharmacy and Therapeutics, School of Pharmacy, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Christopher M. Horvat
- Department of Critical Care Medicine, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - David P. Kao
- Department of Medicine, School of Medicine, University of Colorado, Aurora
| | - Gloria P. Lipori
- University of Florida Health and University of Florida Health Sciences Center, Gainesville
| | - Marc B. Rosenman
- Department of Pediatrics, Indiana University School of Medicine, Indianapolis
- Department of Pediatrics, Ann & Robert H. Lurie Children’s Hospital of Chicago, Chicago, Illinois
| | - Todd C. Skaar
- Department of Medicine, Indiana University School of Medicine, Indianapolis
| | | | - Almut G. Winterstein
- Department of Pharmaceutical Outcomes and Policy and Center for Drug Evaluation and Safety, University of Florida, Gainesville
| | - Aniwaa Owusu Obeng
- The Charles Bronfman Institute for Personalized Medicine, Departments of Medicine and Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Daria Salyakina
- Personalized Medicine Initiative, Nicklaus Children’s Health System, Miami, Florida
| | - Apeksha Gupta
- Personalized Medicine Initiative, Nicklaus Children’s Health System, Miami, Florida
| | - Joshua Gruber
- Personalized Medicine Initiative, Nicklaus Children’s Health System, Miami, Florida
| | | | - Jeffrey R. Bishop
- Department of Experimental and Clinical Pharmacology, University of Minnesota College of Pharmacy, Minneapolis
- Department of Psychiatry, University of Minnesota Medical School, Minneapolis
| | - Zach Rivers
- Department of Pharmaceutical Care and Health Systems, University of Minnesota College of Pharmacy, Minneapolis
| | - Ashley Benner
- Clinical and Translational Science Institute, University of Minnesota, Minneapolis
| | - Bani Tamraz
- School of Pharmacy, University of California, San Francisco
| | | | - Josh F. Peterson
- Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee
| | - Sara L. Van Driest
- Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee
- Department of Pediatrics, Vanderbilt University Medical Center, Nashville, Tennessee
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Miyagi SJ, Lam E, Girdwood ST. Partnering with Clinical Pharmacologists to Improve Medication Use in Children. J Pediatr 2020; 227:5-8. [PMID: 33228913 PMCID: PMC8162685 DOI: 10.1016/j.jpeds.2020.03.061] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/27/2020] [Accepted: 03/27/2020] [Indexed: 12/19/2022]
Affiliation(s)
- Shogo John Miyagi
- T32 Pediatric Clinical Pharmacology Training Program, Pediatric Clinical and Developmental Pharmacology Training Network, National Institute of Child Health and Human Development, Rockville, MD; Divisions of Clinical Pharmacology and Pharmacy, Children's National Medical Center, Washington, DC.
| | - Edwin Lam
- T32 Pediatric Clinical Pharmacology Training Program, Pediatric Clinical and Developmental Pharmacology Training Network, National Institute of Child Health and Human Development, Rockville, MD,Department of Pharmacology and Experimental Therapeutics, Thomas Jefferson University, Philadelphia, PA
| | - Sonya Tang Girdwood
- T32 Pediatric Clinical Pharmacology Training Program, Pediatric Clinical and Developmental Pharmacology Training Network, National Institute of Child Health and Human Development, Rockville, MD,Divisions of Pediatric Clinical Pharmacology and Pediatric Hospital Medicine, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH
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Impact of Obesity on Voriconazole Pharmacokinetics among Pediatric Hematopoietic Cell Transplant Recipients. Antimicrob Agents Chemother 2020; 64:AAC.00653-20. [PMID: 32988816 DOI: 10.1128/aac.00653-20] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Accepted: 09/18/2020] [Indexed: 12/12/2022] Open
Abstract
Voriconazole (VCZ) is an antifungal agent with wide inter- and intrapatient pharmacokinetic (PK) variability and narrow therapeutic index. Although obesity was associated with higher VCZ trough concentrations in adults, the impact of obesity had yet to be studied in children. We characterized the PK of VCZ in obese patients by accounting for age and CYP2C19 phenotype. We conducted intensive PK studies of VCZ and VCZ N-oxide metabolite in 44 hematopoietic stem cell transplantation (HSCT) recipients aged 2 to 21 years who received prophylactic intravenous VCZ every 12 hours (q12h). Blood samples were collected at 5 and 30 minutes; at 1, 3, 6, and 9 hours after infusion completion; and immediately before the next infusion start. We estimated PK parameters with noncompartmental analysis and evaluated for an association with obesity by multiple linear regression analysis. The 44 participants included 9 (20%) with obesity. CYP2C19 metabolism phenotypes were identified as normal in 22 (50%), poor/intermediate in 13 (30%), and rapid/ultrarapid in 9 patients (21%). Obesity status significantly affects the VCZ minimum concentration of drug in serum (C min) (higher by 1.4 mg/liter; 95% confidence interval [CI], 0.0 to 2.8; P = 0.047) and VCZ metabolism ratio (VCZRATIO) (higher by 0.4; 95% CI, 0.0 to 0.7; P = 0.03), while no association was observed with VCZ area under the curve (AUC) (P = 0.09) after adjusting for clinical factors. A younger age and a CYP2C19 phenotype were associated with lower VCZ AUC. Obesity was associated with decreased metabolism of VCZ to its inactive N-oxide metabolite and, concurrently, increased VCZ C min, which is deemed clinically meaningful. Future research should aim to further characterize its effects and determine a proper dosing regimen for the obese.
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Takahashi T, Smith AR, Jacobson PA, Fisher J, Rubin NT, Kirstein MN. Impact of Obesity on Voriconazole Pharmacokinetics among Pediatric Hematopoietic Cell Transplant Recipients. Antimicrob Agents Chemother 2020. [PMID: 32988816 DOI: 10.1128/aac.00611-20/suppl_file/aac.00611-20-s0001.pdf] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/27/2023] Open
Abstract
Voriconazole (VCZ) is an antifungal agent with wide inter- and intrapatient pharmacokinetic (PK) variability and narrow therapeutic index. Although obesity was associated with higher VCZ trough concentrations in adults, the impact of obesity had yet to be studied in children. We characterized the PK of VCZ in obese patients by accounting for age and CYP2C19 phenotype. We conducted intensive PK studies of VCZ and VCZ N-oxide metabolite in 44 hematopoietic stem cell transplantation (HSCT) recipients aged 2 to 21 years who received prophylactic intravenous VCZ every 12 hours (q12h). Blood samples were collected at 5 and 30 minutes; at 1, 3, 6, and 9 hours after infusion completion; and immediately before the next infusion start. We estimated PK parameters with noncompartmental analysis and evaluated for an association with obesity by multiple linear regression analysis. The 44 participants included 9 (20%) with obesity. CYP2C19 metabolism phenotypes were identified as normal in 22 (50%), poor/intermediate in 13 (30%), and rapid/ultrarapid in 9 patients (21%). Obesity status significantly affects the VCZ minimum concentration of drug in serum (Cmin) (higher by 1.4 mg/liter; 95% confidence interval [CI], 0.0 to 2.8; P = 0.047) and VCZ metabolism ratio (VCZRATIO) (higher by 0.4; 95% CI, 0.0 to 0.7; P = 0.03), while no association was observed with VCZ area under the curve (AUC) (P = 0.09) after adjusting for clinical factors. A younger age and a CYP2C19 phenotype were associated with lower VCZ AUC. Obesity was associated with decreased metabolism of VCZ to its inactive N-oxide metabolite and, concurrently, increased VCZ Cmin, which is deemed clinically meaningful. Future research should aim to further characterize its effects and determine a proper dosing regimen for the obese.
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Affiliation(s)
- Takuto Takahashi
- Division of Hematology and Oncology, Department of Pediatrics, University of Minnesota, Minneapolis, Minnesota, USA
- Division of Blood and Marrow Transplant, Department of Pediatrics, University of Minnesota, Minneapolis, Minnesota, USA
- Department of Experimental and Clinical Pharmacology, University of Minnesota, Minneapolis, Minnesota, USA
| | - Angela R Smith
- Division of Blood and Marrow Transplant, Department of Pediatrics, University of Minnesota, Minneapolis, Minnesota, USA
| | - Pamala A Jacobson
- Department of Experimental and Clinical Pharmacology, University of Minnesota, Minneapolis, Minnesota, USA
| | - James Fisher
- Clinical Pharmacology Analytical Services, University of Minnesota, Minneapolis, Minnesota, USA
| | - Nathan T Rubin
- Masonic Cancer Center Biostat Core, University of Minnesota, Minneapolis, Minnesota, USA
| | - Mark N Kirstein
- Department of Experimental and Clinical Pharmacology, University of Minnesota, Minneapolis, Minnesota, USA
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14
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Guy JW, Patel I, Oestreich JH. Clinical Application and Educational Training for Pharmacogenomics. PHARMACY 2020; 8:pharmacy8030163. [PMID: 32899212 PMCID: PMC7558792 DOI: 10.3390/pharmacy8030163] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2020] [Revised: 08/28/2020] [Accepted: 08/31/2020] [Indexed: 12/28/2022] Open
Abstract
Pharmacogenomics—defined as the study of how genes affect a person’s response to drugs—is growing in importance for clinical care. Many medications have evidence and drug labeling related to pharmacogenomics and patient care. New evidence supports the use of pharmacogenomics in clinical settings, and genetic testing may optimize medication selection and dosing. Despite these advantages, the integration of pharmacogenomics into clinical decisions remains variable and challenging in certain practice settings. To ensure consistent application across settings, sufficient education amongst current and future healthcare providers is necessary to further integrate pharmacogenomics into routine clinical practice. This review highlights current evidence supporting clinical application of medications with pharmacogenomic labeling. The secondary objective is to review current strategies for educating health professionals and student trainees. One national organization predicts that most regions in the United States will soon contain at least one healthcare system capable of applying pharmacogenomic information. Applying genotype-guided dosing to several FDA-approved medications may help produce beneficial changes in patient outcomes. Identifying best practices for educating health care professionals and trainees remains vitally important for continuing growth of pharmacogenomic services. As pharmacogenomics continues to expand into more areas of healthcare, current and future practitioners must pursue and maintain competence in pharmacogenomics to ensure better outcomes for patients.
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Affiliation(s)
- Jason W. Guy
- Department of Pharmacy Practice, College of Pharmacy, University of Findlay, Findlay, OH 45840, USA
- Correspondence:
| | - Isha Patel
- Department of Pharmacy Practice, Administration and Research, Marshall University School of Pharmacy, Huntington, WV 25755, USA;
| | - Julie H. Oestreich
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Findlay, Findlay, OH 45840, USA;
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Lee J, Ng P, Hamandi B, Husain S, Lefebvre MJ, Battistella M. Effect of Therapeutic Drug Monitoring and Cytochrome P450 2C19 Genotyping on Clinical Outcomes of Voriconazole: A Systematic Review. Ann Pharmacother 2020; 55:509-529. [DOI: 10.1177/1060028020948174] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Objectives To examine current knowledge on the clinical utility of therapeutic drug monitoring (TDM) in voriconazole therapy, the impact of CYP2C19 genotype on voriconazole plasma concentrations, and the role of CYP2C19 genotyping in voriconazole therapy. Data Sources Three literature searches were conducted for original reports on (1) TDM and voriconazole outcomes and (2) voriconazole and CYP2C19 polymorphisms. Searches were conducted through EMBASE, MEDLINE/PubMed, Scopus, and Cochrane Central Register of Controlled Trials from inception to June 2020. Study Selection and Data Extraction Randomized controlled trials, cohort studies, and case series with ≥10 patients were included. Only full-text references in English were eligible. Data Synthesis A total of 63 studies were reviewed. TDM was recommended because of established concentration and efficacy/toxicity relationships. Voriconazole trough concentrations ≥1.0 mg/L were associated with treatment success; supratherapeutic concentrations were associated with increased neurotoxicity; and hepatotoxicity associations were more prevalent in Asian populations. CYP2C19 polymorphisms significantly affect voriconazole metabolism, but no relationship with efficacy/safety were found. Genotype-guided dosing with TDM was reported to increase chances of achieving therapeutic range. Relevance to Patient Care and Clinical Practice Genotype-guided dosing with TDM is a potential solution to optimizing voriconazole efficacy while avoiding treatment failures and common toxicities. Conclusions Voriconazole plasma concentrations and TDM are treatment outcome predictors, but research is needed to form a consensus target therapeutic range and dosage adjustment guidelines based on plasma concentrations. CYP2C19 polymorphisms are a predictor of voriconazole concentrations and metabolism, but clinical implications are not established. Large-scale, high-methodological-quality trials are required to investigate the role for prospective genotyping and establish CYP2C19-guided voriconazole dosing recommendations.
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Affiliation(s)
| | - Patrick Ng
- University Health Network, Toronto, ON, Canada
| | - Bassem Hamandi
- University of Toronto, ON, Canada
- University Health Network, Toronto, ON, Canada
| | - Shahid Husain
- University of Toronto, ON, Canada
- University Health Network, Toronto, ON, Canada
| | | | - Marisa Battistella
- University of Toronto, ON, Canada
- University Health Network, Toronto, ON, Canada
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Antachopoulos C, Roilides E. Pharmacokinetics and Pharmacodynamics of Antifungal Agents in Neonates and Children. CURRENT FUNGAL INFECTION REPORTS 2020. [DOI: 10.1007/s12281-020-00402-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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17
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Chen C, Yang T, Li X, Ma L, Liu Y, Zhou Y, Ren H, Cui Y. Population Pharmacokinetics of Voriconazole in Chinese Patients with Hematopoietic Stem Cell Transplantation. Eur J Drug Metab Pharmacokinet 2020; 44:659-668. [PMID: 31041728 DOI: 10.1007/s13318-019-00556-w] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
BACKGROUND AND OBJECTIVE Voriconazole is widely recommended for the prevention and treatment of invasive fungal infections in hematopoietic stem cell transplantation patients. However, its use is limited by a narrow therapeutic range and large inter-individual variability. This study aimed to characterize the pharmacokinetics of voriconazole in Chinese hematopoietic stem cell transplantation patients, to explore factors affecting its pharmacokinetic parameters, and to provide recommendations for its optimal dosing regimens. METHODS A total of 121 serum concentration samples from 23 patients were retrospectively included. Voriconazole concentrations were detected, and patient clinical data were recorded. Population pharmacokinetic analysis was performed by a non-linear, mixed-effect modeling approach. Goodness-of-fit plots, bootstrap method, prediction-corrected visual predictive check and external validation by an independent group of seven patients were performed to evaluate the final model. RESULTS A one-compartment model with first-order elimination successfully described the data. The absorption rate constant was fixed at 1.1 h-1 and bioavailability was fixed at 0.895. The typical values for voriconazole clearance and distribution volume were 9.52 L/h and 155 L, respectively. CYP2C19*2 genotype and mycophenolate mofetil combination presented a significant impact on the clearance. Compared with CYP2C19*2 carriers, voriconazole clearance was proven to be higher in CYP2C19*1/*1 patients. CONCLUSIONS A population pharmacokinetic model of voriconazole was successfully established in Chinese hematopoietic stem cell transplantation patients. Based on the final model, CYP2C19*2 genotyping coupled with therapeutic drug monitoring seems to be useful to guide voriconazole dosing and to explain subtherapeutic concentrations in clinical practice.
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Affiliation(s)
- Chaoyang Chen
- Department of Pharmacy, Peking University First Hospital, No. 6, Da Hong Luo Chang Street, Beijing, 100034, China
| | - Ting Yang
- Department of Pharmacy, Peking University First Hospital, No. 6, Da Hong Luo Chang Street, Beijing, 100034, China
| | - Xinran Li
- Department of Pharmacy, Peking University First Hospital, No. 6, Da Hong Luo Chang Street, Beijing, 100034, China.,School of Pharmaceutical Sciences, Peking University Health Science Center, Beijing, China
| | - Lingyun Ma
- Department of Pharmacy, Peking University First Hospital, No. 6, Da Hong Luo Chang Street, Beijing, 100034, China
| | - Yaou Liu
- Department of Pharmacy, Peking University First Hospital, No. 6, Da Hong Luo Chang Street, Beijing, 100034, China
| | - Ying Zhou
- Department of Pharmacy, Peking University First Hospital, No. 6, Da Hong Luo Chang Street, Beijing, 100034, China.,School of Pharmaceutical Sciences, Peking University Health Science Center, Beijing, China
| | - Hanyun Ren
- Department of Hematology, Peking University First Hospital, No. 8, Xishiku Street, Xicheng District, Beijing, 100034, China.
| | - Yimin Cui
- Department of Pharmacy, Peking University First Hospital, No. 6, Da Hong Luo Chang Street, Beijing, 100034, China. .,School of Pharmaceutical Sciences, Peking University Health Science Center, Beijing, China.
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Applying Pharmacogenomics to Antifungal Selection and Dosing: Are We There Yet? CURRENT FUNGAL INFECTION REPORTS 2020; 14:63-75. [PMID: 32256938 DOI: 10.1007/s12281-020-00371-w] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Purpose of Review This review summarizes recent literature for applying pharmacogenomics to antifungal selection and dosing, providing an approach to implementing antifungal pharmacogenomics in clinical practice. Recent Findings The Clinical Pharmacogenetics Implementation Consortium published guidelines on CYP2C19 and voriconazole, with recommendations to use alternative antifungals or adjust voriconazole dose with close therapeutic drug monitoring (TDM). Recent studies demonstrate an association between CYP2C19 phenotype and voriconazole levels, clinical outcomes, and adverse events. Additionally, CYP2C19-guided preemptive dose adjustment demonstrated benefit in two prospective studies for prophylaxis. Pharmacokinetic-pharmacodynamic modeling studies have generated proposed voriconazole treatment doses based on CYP2C19 phenotypes, with further validation studies needed. Summary Sufficient evidence is available for implementing CYP2C19-guided voriconazole selection and dosing among select patients at risk for invasive fungal infections. The institution needs appropriate infrastructure for pharmacogenomic testing, integration of results in the clinical decision process, with TDM confirmation of goal trough achievement, to integrate antifungal pharmacogenomics into routine clinical care.
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Abstract
Pharmacogenetics is a key component of precision medicine. Genetic variation in drug metabolism enzymes can lead to variable exposure to drugs and metabolites, potentially leading to inefficacy and drug toxicity. Although the evidence for pharmacogenetic associations in children is not as extensive as for adults, there are several drugs across diverse therapeutic areas with robust pediatric data indicating important, and relatively common, drug-gene interactions. Guidelines to assist gene-based dose optimization are available for codeine, thiopurine drugs, selective serotonin reuptake inhibitors, atomoxetine, tacrolimus, and voriconazole. For each of these drugs, there is an opportunity to clinically implement precision medicine approaches with children for whom genetic test results are known or are obtained at the time of prescribing. For many more drugs that are commonly used in pediatric patients, additional investigation is needed to determine the genetic factors influencing appropriate dose.
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Affiliation(s)
- Laura B Ramsey
- Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, Ohio 45267, USA
- Divisions of Research in Patient Services and Clinical Pharmacology, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio 45229, USA
| | - Jacob T Brown
- Department of Pharmacy Practice and Pharmaceutical Sciences, University of Minnesota College of Pharmacy, Duluth, Minnesota 55812, USA
| | - Susan I Vear
- Department of Hematology & Oncology, Nationwide Children's Hospital, Columbus, Ohio 43205, USA
| | - Jeffrey R Bishop
- Department of Experimental and Clinical Pharmacology, University of Minnesota College of Pharmacy, and Department of Psychiatry, University of Minnesota Medical School, Minneapolis, Minnesota 55455, USA
| | - Sara L Van Driest
- Departments of Pediatrics and Medicine, Vanderbilt University School of Medicine, Nashville, Tennessee 37232, USA;
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Zheng G, He J, Cai Z, He D, Luo Y, Shi J, Wei G, Sun J, Zheng W. A retrospective study of autologous stem cell mobilization by G-CSF in combination with chemotherapy in patients with multiple myeloma and lymphoma. Oncol Lett 2019; 19:1051-1059. [PMID: 31897218 DOI: 10.3892/ol.2019.11177] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2017] [Accepted: 08/08/2019] [Indexed: 01/18/2023] Open
Abstract
Factors affecting peripheral blood hematopoietic stem cell (PBSC) mobilization and collection were investigated in patients with multiple myeloma (MM) and lymphoma who were undergoing chemotherapy. Clinical data from 128 patients, including 53 MM and 75 malignant lymphoma (7 Hodgkin's lymphoma and 68 non-Hodgkin's lymphoma) cases were retrospectively analyzed. Autologous PBSCs were mobilized using granulocyte-colony stimulating factor (G-CSF) during chemotherapy, and collected using a continuous flow cell separation instrument. The yields of CD34+ cells per kilogram of patient body weight <2.0×106/kg, >2.0×106/kg or >5.0×106/kg were defined as a failure, a success or ideal mobilization, respectively. In MM and lymphoma patients, the success rates of CD34+ cell acquisition were 73.6 (39/53) and 58.7% (44/75), the ideal rates were 43.4 (23/53) and 30.7% (23/75), and the failure rates were 26.4 (14/53) and 41.3% (31/75), respectively. Univariate and multivariate statistical analysis revealed that negative factors for PBSC mobilization in patients with MM were lenalidomide treatment, multiple chemotherapies, incomplete disease remission and low-level blood hemoglobin; in patients with lymphoma, the negative factors were the histological disease type, incomplete disease remission, being beyond the first-line of previous chemotherapy, multiple chemotherapies, chemotherapy with the HyperCVAD-B mobilization scheme, high-dose MTX/Ara-c (methotrexate/cytarabine) treatment, prolonged administration of G-CSF and low-hematocrit levels. In the present study, different factors influencing PBSC mobilization and collection in MM and lymphoma cases were identified. PBSC mobilization yielded sufficient CD34+ cell counts both in MM and lymphoma patients; however, the failure rates were relatively high.
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Affiliation(s)
- Gaofeng Zheng
- Bone Marrow Transplantation Center, First Affiliated Hospital, Zhejiang University and First Hospital of Zhejiang Province, Hangzhou, Zhejiang 310001, P.R. China
| | - Jingsong He
- Bone Marrow Transplantation Center, First Affiliated Hospital, Zhejiang University and First Hospital of Zhejiang Province, Hangzhou, Zhejiang 310001, P.R. China
| | - Zhen Cai
- Bone Marrow Transplantation Center, First Affiliated Hospital, Zhejiang University and First Hospital of Zhejiang Province, Hangzhou, Zhejiang 310001, P.R. China
| | - Donghua He
- Bone Marrow Transplantation Center, First Affiliated Hospital, Zhejiang University and First Hospital of Zhejiang Province, Hangzhou, Zhejiang 310001, P.R. China
| | - Yi Luo
- Bone Marrow Transplantation Center, First Affiliated Hospital, Zhejiang University and First Hospital of Zhejiang Province, Hangzhou, Zhejiang 310001, P.R. China
| | - Jimin Shi
- Bone Marrow Transplantation Center, First Affiliated Hospital, Zhejiang University and First Hospital of Zhejiang Province, Hangzhou, Zhejiang 310001, P.R. China
| | - Guoqing Wei
- Bone Marrow Transplantation Center, First Affiliated Hospital, Zhejiang University and First Hospital of Zhejiang Province, Hangzhou, Zhejiang 310001, P.R. China
| | - Jie Sun
- Bone Marrow Transplantation Center, First Affiliated Hospital, Zhejiang University and First Hospital of Zhejiang Province, Hangzhou, Zhejiang 310001, P.R. China
| | - Weiyan Zheng
- Bone Marrow Transplantation Center, First Affiliated Hospital, Zhejiang University and First Hospital of Zhejiang Province, Hangzhou, Zhejiang 310001, P.R. China
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21
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A phase I dose finding study of intravenous voriconazole in pediatric patients undergoing hematopoietic cell transplantation. Bone Marrow Transplant 2019; 55:955-964. [PMID: 31768008 DOI: 10.1038/s41409-019-0757-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2019] [Revised: 11/06/2019] [Accepted: 11/13/2019] [Indexed: 11/08/2022]
Abstract
To optimize voriconazole dosing in pediatric hematopoietic cell transplantation (HCT), we conducted a phase I study with a modified 3 + 3 dose-escalation followed by an expansion cohort at the maximum tolerated, minimum efficacious dose (MTD/MED). Patients ≤21 years who required voriconazole for prevention or treatment of an invasive fungal infection were assigned to three age groups. Of the 59 evaluable patients, 13 were <2 years, 23 were 2-11, and 23 were 12-21. Therapeutic serum voriconazole troughs (1.5-5 µg/mL) drawn at 7 days after initiation determined efficacy. The MTD/MED was 12 mg/kg/dose q12 h × 2 loading doses, then 10 mg/kg/dose q12 h in patients <2, and was 10 mg/kg/dose q12 h in patients 2-11. The 12-21 age group had no dose-limiting toxicity at 8 mg/kg/dose q12 h; however, the MED was not reached. Drug-related AEs ≥grade 3 included increased bilirubin, transaminases, and creatinine, all occurring in <10%. There was no significant association between supra-therapeutic troughs and AEs. Five of 17 patients who had supra-therapeutic troughs (29%) had an AE, compared to 8 of 42 who did not (19%, p = 0.38). Observational population pharmacokinetic analysis demonstrated that inter-individual variability on voriconazole clearance was >100% CV, and clearance increased with age.
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Espinoza N, Galdames J, Navea D, Farfán MJ, Salas C. Frequency of the CYP2C19*17 polymorphism in a Chilean population and its effect on voriconazole plasma concentration in immunocompromised children. Sci Rep 2019; 9:8863. [PMID: 31222084 PMCID: PMC6586657 DOI: 10.1038/s41598-019-45345-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Accepted: 06/03/2019] [Indexed: 11/09/2022] Open
Abstract
Invasive fungal infections (IFIs) are the most frequent cause of morbidity and mortality in immunocompromised children. Voriconazole is the first-line antifungal choice in the treatment of IFIs like aspergillosis. Voriconazole pharmacokinetics vary widely among patients and voriconazole is metabolized mainly in the liver by the CYP2C19 enzyme, which is highly polymorphic. The CYP2C19*17 allele is characterized by the presence of four single nucleotide polymorphisms expressing an ultra-rapid enzyme phenotype with an accelerated voriconazole metabolism, is associated with low (sub-therapeutic) plasma levels in patients treated with the standard dose. Considering that in our center a high percentage of children have sub-therapeutic levels of voriconazole when treated with standard doses, we sought to determine the frequency of the CYP2C19*17 polymorphism (rs12248560) in a Chilean population and determine the association between voriconazole concentrations and the rs12248560 variant in immunocompromised children. First, we evaluated the frequency of the rs12248560 variant in a group of 232 healthy Chilean children, and we found that 180 children (77.6%) were non-carriers of the rs12248560 variant, 49 children (21.1%) were heterozygous carriers for rs12248560 variant and only 3 children (1.3%) were homozygous carriers for rs12248560 variant, obtaining an allelic frequency of 12% for variant in a Chilean population. To determine the association between voriconazole concentrations and the rs12248560 variant, we analyzed voriconazole plasma concentrations in a second group of 33 children treated with voriconazole. In these patients, carriers of the rs12248560 variant presented significantly lower voriconazole plasma concentrations than non-carriers (p = 0,011). In this study, we show the presence of the rs12248560 variant in a Chilean population and its accelerating effect on the pharmacokinetics of voriconazole in pediatric patients. From these data, it would be advisable to consider the variant of the patient prior to calculating the dosage of voriconazole.
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Affiliation(s)
- N Espinoza
- Laboratorio Clínico, Hospital Dr. Luis Calvo Mackenna, Santiago, Chile
| | - J Galdames
- Laboratorio Clínico, Hospital Dr. Luis Calvo Mackenna, Santiago, Chile
| | - D Navea
- Laboratorio Clínico, Hospital Dr. Luis Calvo Mackenna, Santiago, Chile
| | - M J Farfán
- Laboratorio Clínico, Hospital Dr. Luis Calvo Mackenna, Santiago, Chile. .,Departamento de Pediatría y Cirugía Infantil, Campus Oriente, Hospital Dr. Luis Calvo Mackenna, Facultad de Medicina, Universidad de Chile, Santiago, Chile.
| | - C Salas
- Laboratorio Clínico, Hospital Dr. Luis Calvo Mackenna, Santiago, Chile.
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Kim Y, Rhee SJ, Park WB, Yu KS, Jang IJ, Lee S. A Personalized CYP2C19 Phenotype-Guided Dosing Regimen of Voriconazole Using a Population Pharmacokinetic Analysis. J Clin Med 2019; 8:E227. [PMID: 30744151 PMCID: PMC6406770 DOI: 10.3390/jcm8020227] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2019] [Revised: 01/28/2019] [Accepted: 01/31/2019] [Indexed: 12/11/2022] Open
Abstract
Highly variable and non-linear pharmacokinetics of voriconazole are mainly caused by CYP2C19 polymorphisms. This study aimed to develop a mechanistic population pharmacokinetic model including the CYP2C19 phenotype, and to assess the appropriateness of various dosing regimens based on the therapeutic target. A total of 1,828 concentrations from 193 subjects were included in the population pharmacokinetic analysis. A three-compartment model with an inhibition compartment appropriately described the voriconazole pharmacokinetics reflecting auto-inhibition. Voriconazole clearance in the CYP2C19 intermediate metabolizers (IMs) and poor metabolizers (PMs) decreased by 17% and 53% compared to that in the extensive metabolizers (EMs). There was a time-dependent inhibition of clearance to 16.2% of its original value in the CYP2C19 EMs, and the extent of inhibition differed according to the CYP2C19 phenotypes. The proposed CYP2C19 phenotype-guided initial dosing regimens are 400 mg twice daily (bid) for EMs, 200 mg bid for IMs, and 100 mg bid for PMs. This CYP2C19 phenotype-guided initial dosing regimen will provide a rationale for individualizing the optimal voriconazole therapy.
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Affiliation(s)
- Yun Kim
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul 03080, Korea.
| | - Su-Jin Rhee
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul 03080, Korea.
| | - Wan Beom Park
- Department of Internal Medicine, Seoul National University College of Medicine and Hospital, Seoul 03080, Korea.
| | - Kyung-Sang Yu
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul 03080, Korea.
| | - In-Jin Jang
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul 03080, Korea.
| | - SeungHwan Lee
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul 03080, Korea.
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Unique Challenges of Hematopoietic Cell Transplantation in Adolescent and Young Adults with Hematologic Malignancies. Biol Blood Marrow Transplant 2018; 24:e11-e19. [DOI: 10.1016/j.bbmt.2018.09.011] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2018] [Accepted: 09/08/2018] [Indexed: 12/16/2022]
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25
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Simultaneous quantification of systemic azoles and their major metabolites in human serum by HPLC/PDA: role of azole metabolic rate. Diagn Microbiol Infect Dis 2018; 92:78-83. [DOI: 10.1016/j.diagmicrobio.2018.04.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2017] [Revised: 02/07/2018] [Accepted: 04/06/2018] [Indexed: 01/12/2023]
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26
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Patel JN, Wiebe LA, Dunnenberger HM, McLeod HL. Value of Supportive Care Pharmacogenomics in Oncology Practice. Oncologist 2018; 23:956-964. [PMID: 29622698 PMCID: PMC6156181 DOI: 10.1634/theoncologist.2017-0599] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2017] [Accepted: 02/21/2018] [Indexed: 12/14/2022] Open
Abstract
Genomic medicine provides opportunities to personalize cancer therapy for an individual patient. Although novel targeted therapies prolong survival, most patients with cancer continue to suffer from burdensome symptoms including pain, depression, neuropathy, nausea and vomiting, and infections, which significantly impair quality of life. Suboptimal management of these symptoms can negatively affect response to cancer treatment and overall prognosis. The effect of genetic variation on drug response-otherwise known as pharmacogenomics-is well documented and directly influences an individual patient's response to antiemetics, opioids, neuromodulators, antidepressants, antifungals, and more. The growing body of pharmacogenomic data can now guide clinicians to select the safest and most effective supportive medications for an individual patient with cancer from the very first prescription. This review outlines a theoretical patient case and the implications of using pharmacogenetic test results to personalize supportive care throughout the cancer care continuum. IMPLICATIONS FOR PRACTICE Integration of palliative medicine into the cancer care continuum has resulted in increased quality of life and survival for patients with many cancer types. However, suboptimal management of symptoms such as pain, neuropathy, depression, and nausea and vomiting continues to place a heavy burden on patients with cancer. As demonstrated in this theoretical case, pharmacogenomics can have a major effect on clinical response to medications used to treat these conditions. Recognizing the value of supportive care pharmacogenomics in oncology and application into routine practice offers an objective choice for the safest and most effective treatment compared with the traditional trial and error method.
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Affiliation(s)
- Jai N Patel
- Levine Cancer Institute, Carolinas HealthCare System, Charlotte, North Carolina, USA
| | - Lauren A Wiebe
- NorthShore University Health System, Evanston, Illinois, USA
| | | | - Howard L McLeod
- The DeBartolo Family Personalized Medicine Institute, Moffitt Cancer Center, Tampa, Florida, USA
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Lin X, Li Z, Yan M, Zhang B, Liang W, Wang F, Xu P, Xiang D, Xie X, Yu S, Lan G, Peng F. Population pharmacokinetics of voriconazole and CYP2C19 polymorphisms for optimizing dosing regimens in renal transplant recipients. Br J Clin Pharmacol 2018; 84:1587-1597. [PMID: 29607533 PMCID: PMC6005582 DOI: 10.1111/bcp.13595] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2017] [Revised: 03/13/2018] [Accepted: 03/18/2018] [Indexed: 12/15/2022] Open
Abstract
AIMS The aims of the present study were to characterize the pharmacokinetics of voriconazole in renal transplant recipients and to identify factors significantly affecting pharmacokinetic parameters. We also aimed to explore the optimal dosing regimens for patients who developed invasive fungal infections. METHODS A total of 105 patients (342 concentrations) were included prospectively in a population pharmacokinetic analysis. Nonlinear mixed-effects models were developed using Phoenix NLME software. Dosing simulations were performed based on the final model. RESULTS A one-compartment model with first-order absorption and elimination was used to characterize voriconazole pharmacokinetics. Population estimates of clearance, volume of distribution and oral bioavailability were 2.88 l·h-1 , 169.3 l and 58%, respectively. The allele frequencies of cytochrome P450 gene (CYP) 2C19*2, *3 and *17 variants were 29.2%, 5.2% and 0.5%, respectively. CYP2C19 genotype had a significant effect on the clearance. Voriconazole trough concentrations in poor metabolizers were significantly higher than in intermediate metabolizers and extensive metabolizers alike. The volume of distribution increased with increased body weight. The oral bioavailability was substantially lower within 1 month after transplantation but increased with postoperative time. Dosing simulations indicated that during the early postoperative period, poor metabolizers could be treated with 150 mg intravenously or 250 mg orally twice daily; intermediate metabolizers with 200 mg intravenously or 350 mg orally twice daily; and extensive metabolizers with 300 mg intravenously twice daily. CONCLUSIONS Using a combination of CYP2C19 genotype and postoperative time to determine the initial voriconazole dosing regimens followed by therapeutic drug monitoring could help to advance individualized treatment in renal transplantation patients with invasive fungal infections.
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Affiliation(s)
- Xiao‐bin Lin
- Department of Pharmacy, the Second Xiangya HospitalCentral South UniversityChangshaHunan410011China
- Institute of Clinical PharmacyCentral South UniversityChangshaHunan410011China
- Department of Pharmacythe First Affiliated Hospital of Sun Yat‐sen UniversityGuangzhouGuangdong510080China
| | - Zi‐wei Li
- Department of Pharmacy, the Second Xiangya HospitalCentral South UniversityChangshaHunan410011China
- Institute of Clinical PharmacyCentral South UniversityChangshaHunan410011China
- Department of PharmacyRuijin Hospital Shanghai Jiaotong University School of MedicineShanghai200025China
| | - Miao Yan
- Department of Pharmacy, the Second Xiangya HospitalCentral South UniversityChangshaHunan410011China
- Institute of Clinical PharmacyCentral South UniversityChangshaHunan410011China
| | - Bi‐kui Zhang
- Department of Pharmacy, the Second Xiangya HospitalCentral South UniversityChangshaHunan410011China
- Institute of Clinical PharmacyCentral South UniversityChangshaHunan410011China
| | - Wu Liang
- Beijing Dryas Pharma‐Tech Co. LTD.Beijing100085China
| | - Feng Wang
- Department of Pharmacy, the Second Xiangya HospitalCentral South UniversityChangshaHunan410011China
- Institute of Clinical PharmacyCentral South UniversityChangshaHunan410011China
| | - Ping Xu
- Department of Pharmacy, the Second Xiangya HospitalCentral South UniversityChangshaHunan410011China
- Institute of Clinical PharmacyCentral South UniversityChangshaHunan410011China
| | - Da‐xiong Xiang
- Department of Pharmacy, the Second Xiangya HospitalCentral South UniversityChangshaHunan410011China
- Institute of Clinical PharmacyCentral South UniversityChangshaHunan410011China
| | - Xu‐biao Xie
- Department of Urological Organ Transplantation, the Second Xiangya HospitalCentral South UniversityChangshaHunan410011China
| | - Shao‐jie Yu
- Department of Urological Organ Transplantation, the Second Xiangya HospitalCentral South UniversityChangshaHunan410011China
| | - Gong‐bin Lan
- Department of Urological Organ Transplantation, the Second Xiangya HospitalCentral South UniversityChangshaHunan410011China
| | - Feng‐hua Peng
- Department of Urological Organ Transplantation, the Second Xiangya HospitalCentral South UniversityChangshaHunan410011China
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Amsden JR, Gubbins PO. Pharmacogenomics of triazole antifungal agents: implications for safety, tolerability and efficacy. Expert Opin Drug Metab Toxicol 2017; 13:1135-1146. [DOI: 10.1080/17425255.2017.1391213] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Jarrett R. Amsden
- Department of Pharmacy Practice, Butler University College of Pharmacy and Health Sciences, Indianapolis, IN, USA
| | - Paul O. Gubbins
- Division of Pharmacy Practice and Administration, UMKC School of Pharmacy at MSU, Springfield, MO, USA
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Shah RR. Pharmacogenetics and precision medicine: Is inflammation a covert threat to effective genotype-based therapy? Ther Adv Drug Saf 2017; 8:267-272. [PMID: 28861210 DOI: 10.1177/2042098617712657] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Accepted: 05/05/2017] [Indexed: 12/30/2022] Open
Affiliation(s)
- Rashmi R Shah
- Pharmaceutical consultant, 8 Birchdale, Gerrards Cross, Buckinghamshire, UK
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Ho S, Rawlins M, Ingram P, Boan P. Voriconazole-induced hyponatraemia associated with homozygous CYP2C19*2 genotype. J Chemother 2017; 29:325-326. [PMID: 28482780 DOI: 10.1080/1120009x.2017.1323395] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Sharon Ho
- a Department of Pharmacy , Fiona Stanley Hospital , Perth , Australia
| | - Matthew Rawlins
- a Department of Pharmacy , Fiona Stanley Hospital , Perth , Australia
| | - Paul Ingram
- b Department of Infectious Diseases and Department of Microbiology , Fiona Stanley Hospital , Perth , Australia.,c School of Medicine and Pharmacology , University of Western Australia , Perth , Australia
| | - Peter Boan
- b Department of Infectious Diseases and Department of Microbiology , Fiona Stanley Hospital , Perth , Australia
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Safety, Efficacy, and Exposure-Response of Voriconazole in Pediatric Patients With Invasive Aspergillosis, Invasive Candidiasis or Esophageal Candidiasis. Pediatr Infect Dis J 2017; 36:e1-e13. [PMID: 27636722 PMCID: PMC5345593 DOI: 10.1097/inf.0000000000001339] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
BACKGROUND Data on safety and efficacy of voriconazole for invasive aspergillosis (IA) and invasive candidiasis/esophageal candidiasis (IC/EC) in pediatric patients are limited. METHODS Patients aged 2-<18 years with IA and IC/EC were enrolled in 2 prospective open-label, non-comparative studies of voriconazole. Patients followed dosing regimens based on age, weight and indication, with adjustments permitted. Treatment duration was 6-12 weeks for IA patients, ≥14 days after last positive Candida culture for IC patients and ≥7 days after signs/symptoms resolution for EC patients. Primary analysis for both the studies was safety and tolerability of voriconazole. Secondary end points included global response success at week 6 and end of treatment (EOT), all-causality mortality and time to death. Voriconazole exposure-response relationship was explored. RESULTS Of 53 voriconazole-treated pediatric patients (31 IA; 22 IC/EC), 14 had proven/probable IA, 7 had confirmed IC and 10 had confirmed EC. Treatment-related hepatic and visual adverse events, respectively, were reported in 22.6% and 16.1% of IA patients, and 22.7% and 27.3% of IC/EC patients. All-causality mortality in IA patients was 14.3% at week 6; no deaths were attributed to voriconazole. No deaths were reported for IC/EC patients. Global response success rate was 64.3% (week 6 and EOT) in IA patients and 76.5% (EOT) in IC/EC patients. There was no association between voriconazole exposure and efficacy; however, a slight positive association between voriconazole exposure and hepatic adverse events was established. CONCLUSIONS Safety and efficacy outcomes in pediatric patients with IA and IC/EC were consistent with previous findings in adult patients.
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Hicks JK, Gonzalez BE, Zembillas AS, Kusick K, Murthy S, Raja S, Gordon SM, Hanna R. Invasive Aspergillus infection requiring lobectomy in a CYP2C19 rapid metabolizer with subtherapeutic voriconazole concentrations. Pharmacogenomics 2016; 17:663-7. [PMID: 27143031 DOI: 10.2217/pgs-2015-0014] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Individuals who carry the CYP2C19*17 gain-of-function allele have lower voriconazole exposure and are therefore at risk of failing therapy. Utilizing CYP2C19 genotype to optimize voriconazole dosage may be a cost-effective method of improving treatment outcomes. However, there are limited data describing what initial voriconazole dosage should be used in those with increased CYP2C19 metabolic capacity. Herein, we present a case report of a pediatric CYP2C19 rapid metabolizer (i.e., CYP2C19*1/*17) requiring a voriconazole dosage of 14 mg/kg twice daily (usual pediatric dosage ranges from 7 to 9 mg/kg twice daily). This case report supports the clinical utility of using CYP2C19 genotype to guide voriconazole dosing, and provides data for establishing an initial voriconazole dose in pediatric CYP2C19 rapid metabolizers.
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Affiliation(s)
- J Kevin Hicks
- Pharmacy Department, Cleveland Clinic, Cleveland, OH, USA.,Genomic Medicine Institute, Cleveland Clinic, Cleveland, OH, USA
| | - Blanca E Gonzalez
- Medicine Institute, Infectious Disease Department, Cleveland Clinic, Cleveland, OH, USA
| | | | - Karissa Kusick
- Pharmacy Department, Cleveland Clinic, Cleveland, OH, USA
| | - Sudish Murthy
- Heart & Vascular Institute, Thoracic & Cardiovascular Surgery Department, Cleveland Clinic, Cleveland, OH, USA
| | - Siva Raja
- Heart & Vascular Institute, Thoracic & Cardiovascular Surgery Department, Cleveland Clinic, Cleveland, OH, USA
| | - Steven M Gordon
- Medicine Institute, Infectious Disease Department, Cleveland Clinic, Cleveland, OH, USA
| | - Rabi Hanna
- Children's Hospital & Pediatrics Institute, Hematology & Oncology Department, Cleveland Clinic, Cleveland, OH, USA
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