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Liu Z, Luo F, Zhao J, Chen W, Gao W, Zhou Z. Association between gene polymorphisms and initial warfarin therapy in patients after heart valve surgery. Pharmacol Rep 2024; 76:390-399. [PMID: 38457019 DOI: 10.1007/s43440-024-00575-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2023] [Revised: 02/14/2024] [Accepted: 02/15/2024] [Indexed: 03/09/2024]
Abstract
BACKGROUND Warfarin is widely used for the prevention and treatment of thrombotic events. This study aimed to examine the influence of gene polymorphisms on the early stage of warfarin therapy in patients following heart valve surgery. METHODS Nine single nucleotide polymorphisms were genotyped using microarray chips, categorizing patients into three groups: normal responders (Group I), sensitive responders (Group II), and highly sensitive responders (Group III). The primary clinical outcomes examined were time in therapeutic range (TTR) and international normalized ratio (INR) variability. To investigate potential influencing factors, a generalized linear regression model was employed. RESULTS Among 734 patients, the prevalence of CYP2C9*3-1075A > C, CYP2C19*3-636G > A, and CYP2C19*17-806C > T variants were 11.2%, 9.9%, and 1.9% of patients, respectively. VKORC1-1639G > A or the linked -1173C > T variant was observed in 99.0% of the patients. Generalized linear model analysis revealed an impact of sensitivity grouping on INR variability. Compared to Group I, Group II showed higher TTR values (p = 0.023), while INR variability was poorer in Group II (p < 0.001) and Group III (p < 0.001). Individual gene analysis identified significant associations between CYP2C9*3-1075A > C (p < 0.001), VKORC1-1639G > A or the linked -1173 C > T (p = 0.009) and GGCX-3261G > A (p = 0.019) with INR variability. CONCLUSION The genotypes of CYP2C9, VKORC1, and GGCX were found to have a significant impact on INR variability during the initial phase of warfarin therapy. However, no significant association was observed between TTR and gene polymorphisms. These findings suggest that focusing on INR variability is crucial in clinical practice, and preoperative detection of gene polymorphisms should be considered to assist in the initiation of warfarin therapy.
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Affiliation(s)
- Zhaohui Liu
- Department of Laboratory Medicine, State Key Laboratory of Cardiovascular Disease, Beijing Key Laboratory for Molecular Diagnostics of Cardiovascular Diseases, Center of Laboratory Medicine, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Fengming Luo
- Department of Laboratory Medicine, State Key Laboratory of Cardiovascular Disease, Beijing Key Laboratory for Molecular Diagnostics of Cardiovascular Diseases, Center of Laboratory Medicine, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Juan Zhao
- Department of Laboratory Medicine, State Key Laboratory of Cardiovascular Disease, Beijing Key Laboratory for Molecular Diagnostics of Cardiovascular Diseases, Center of Laboratory Medicine, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Weinan Chen
- Information Center, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Wei Gao
- Department of Cardiovascular Surgery, Fuwai Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China.
| | - Zhou Zhou
- Department of Laboratory Medicine, State Key Laboratory of Cardiovascular Disease, Beijing Key Laboratory for Molecular Diagnostics of Cardiovascular Diseases, Center of Laboratory Medicine, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China.
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Rusdiana T, Mardhiani YD, Putriana NA, Gozali D, Nagano D, Araki T, Yamamoto K. The influence of Javanese turmeric ( Curcuma xanthorrhiza) on the pharmacokinetics of warfarin in rats with single and multiple-dose studies. PHARMACEUTICAL BIOLOGY 2021; 59:639-646. [PMID: 34062109 PMCID: PMC8172219 DOI: 10.1080/13880209.2021.1928716] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
CONTEXT Co-administration between warfarin (WF) and Curcuma xanthorrhiza Roxb. (Zingiberaceae) (CX) is found in Indonesian patients and need to be evaluated. OBJECTIVE This study assesses the effect of concomitant administration of CX extract on the pharmacokinetics of WF in rats. MATERIALS AND METHODS Wistar rats were divided into 4 groups (n = 6) and administered with 2% Pulvis Gummi Arabicum (PGA, control), fluconazole (FZ, 6 mg/kg), CX-1 (6 mg/kg) or CX-2 (18 mg/kg BW) for 7 days. For the single-dose study, at the 8th day, WF (1 mg/kg) was administered to all groups and blood samples were taken from 0.25 to 72 h. For the multiple-dose study, daily dose of WF was administered to all groups of rats and at the 7th to 9th day, the rats were treated with PGA, CX-1, CX-2 and FZ. Blood samples were withdrawn daily at 4 h after administration of WF from the 1st to 11th day. RESULTS The area under the curve (AUC) of R- and S-WF in the CX-2 group was a significantly higher value compared to the control (77.54 vs. 35.27 mg.h/L for R-WF and 316.26 vs. 40.16 mg.h/L for S-WF; p < 0.05; Kruskal-Wallis method). The CX-2 administration also caused the increasing in the concentration level of R-WF (16%) and S-WF (27%) from the 7th to 9th day of administration. DISCUSSION AND CONCLUSIONS The CX administration in a higher dose caused alteration on WF pharmacokinetics suggesting the need for clinical evaluation of the interaction between CX and WF.
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Affiliation(s)
- Taofik Rusdiana
- Department of Pharmaceutics and Pharmaceutical Technology, Faculty of Pharmacy, Universitas Padjadjaran, Sumedang, Indonesia
- CONTACT Taofik Rusdiana Department of Pharmaceutics and Pharmaceutical Technology, Faculty of Pharmacy, Universitas Padjadjaran, Jl. Raya Bandung-Sumedang km 21, Jatinangor, Sumedang, West Java45363, Indonesia
| | | | - Norisca A. Putriana
- Department of Pharmaceutics and Pharmaceutical Technology, Faculty of Pharmacy, Universitas Padjadjaran, Sumedang, Indonesia
| | - Dolih Gozali
- Department of Pharmaceutics and Pharmaceutical Technology, Faculty of Pharmacy, Universitas Padjadjaran, Sumedang, Indonesia
| | - Daisuke Nagano
- Department of Clinical Pharmacology and Therapeutics, Graduate School of Medicine, Gunma University, Maebashi, Japan
| | - Takuya Araki
- Department of Clinical Pharmacology and Therapeutics, Graduate School of Medicine, Gunma University, Maebashi, Japan
| | - Koujirou Yamamoto
- Department of Clinical Pharmacology and Therapeutics, Graduate School of Medicine, Gunma University, Maebashi, Japan
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Ren Y, Yang C, Chen H, Dai D, Wang Y, Zhu H, Wang F. Pharmacogenetic-Guided Algorithm to Improve Daily Dose of Warfarin in Elder Han-Chinese Population. Front Pharmacol 2020; 11:1014. [PMID: 32754031 PMCID: PMC7365937 DOI: 10.3389/fphar.2020.01014] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Accepted: 06/23/2020] [Indexed: 12/29/2022] Open
Abstract
Objectives To verify the accuracy of the International Warfarin Pharmacogenetics Consortium (IWPC) algorithm, identify the effects of genetic and clinical factors on warfarin stable dose, and to establish a new warfarin stable dose prediction algorithm for the elderly Han-Chinese population under the guidance of pharmacogenetics. Methods According to the inclusion criteria, 544 non-valvular atrial fibrillation patients taking warfarin for anticoagulation treatment were enrolled. Data information of three groups including the whole population, people under 65 years old and over 65 years old were substituted into the IWPC algorithm respectively to verify its accuracy. The basic data and clinical information of 360 elderly people were collected for statistical analysis and the genotypes of VKORC1-G1639A and CYP2C9 were detected by Sanger sequencing. The new algorithm of the elder pharmacogenetics warfarin dosing was obtained by stepwise multiple regression. The determination coefficient (R2), root mean squared error (RMSE), and the proportion of the predicted value within the true value range of ±20%(20%-p) were used to evaluate the accuracy of the IWPC algorithm and the new algorithm. Results Among the three different age groups, the warfarin stable dose predictive accuracy of IWPC algorithm was the lowest in the elderly patients above 65-year-old. In this study, the important factors influencing the stable dose of warfarin in the elderly Han-Chinese were height, weight, body surface area, serum creatinine level, amiodarone usage, CYP2C9 (*1*2, *1*3), and VKORC1 (GG/GA) genotypes. By means of stepwise multiple regression analysis, we established a new elder warfarin dosing algorithm (R2=0.3714) containing height, creatinine, amiodarone usage, CYP2C9 (*1*2 or *1*3), and VKORC1 (GA or GG) genotypes. The prediction accuracy and clinical availability of the Elderly algorithm was significantly better than that of IWPC algorithm verified by RMSE, R2, and (20%-p) methods. Conclusions The IWPC model may not be suitable for the elder Han-Chinese population. Polymorphism of CYP2C9 and VKORC1 obviously affected warfarin stable dose of the elder Han-Chinese. Combination of genetic data with demographic and clinical factors could help to better improve warfarin doses in the elder Han-Chinese population.
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Affiliation(s)
- Yirong Ren
- Department of Cardiology, Beijing Hospital, National Center of Gerontology, Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, Beijing, China.,Graduate School of Peking Union Medical College, Chinese Academy of Medical Science, Beijing, China
| | - Chenguang Yang
- Department of Cardiology, Beijing Hospital, National Center of Gerontology, Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, Beijing, China
| | - Hao Chen
- Department of Cardiology, Beijing Hospital, National Center of Gerontology, Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, Beijing, China
| | - Dapeng Dai
- Department of Cardiology, Beijing Hospital, National Center of Gerontology, Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, Beijing, China
| | - Yan Wang
- Department of Cardiology, Beijing Hospital, National Center of Gerontology, Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, Beijing, China
| | - Huolan Zhu
- Department of Cardiology, Beijing Hospital, National Center of Gerontology, Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, Beijing, China
| | - Fang Wang
- Department of Cardiology, Beijing Hospital, National Center of Gerontology, Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, Beijing, China.,Graduate School of Peking Union Medical College, Chinese Academy of Medical Science, Beijing, China
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Lin X, Chen H, Ni L, Yu Y, Luo Z, Liao L. Effects of EPHX1 rs2260863 polymorphisms on warfarin maintenance dose in very elderly, frail Han-Chinese population. Pharmacogenomics 2020; 21:863-870. [PMID: 32559398 DOI: 10.2217/pgs-2020-0054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Aim: This study was conducted to investigate the effects of VKORC1, CYP2C9, CYP4F2 and EPHX1 and nongenetic factors on warfarin maintenance dose in a very elderly, frail Han-Chinese population. Materials & methods: 16 variants of VKORC1, CYP2C9, CYP4F2 and EPHX1 were genotyped. Univariate analysis and multivariable regression model were performed for the associations of gene variants and warfarin maintenance dose. Results & conclusion: EPHX1 rs2260863 nonvariant CC homozygotes required significantly lower daily warfarin dose than GC heterozygotes. In the multivariable model, VKORC1 rs9923231, CYP2C9 rs1057910, EPHX1 rs2260863, CYP4F2 rs2189784 and body surface area altogether explained 26.9% of dosing variability. This study revealed the main impact of genetic factors on warfarin response in this special population.
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Affiliation(s)
- Xianliang Lin
- Department of Cardiovascular Disease, 900 Hospital of The Joint Logistics Team, 156 North Road, West 2nd Ring Road, Fuzhou, Fujian, 350000, PR China
| | - Hao Chen
- Department of Cardiovascular Disease, 900 Hospital of The Joint Logistics Team, 156 North Road, West 2nd Ring Road, Fuzhou, Fujian, 350000, PR China
| | - Le Ni
- Department of Cardiovascular Disease, 900 Hospital of The Joint Logistics Team, 156 North Road, West 2nd Ring Road, Fuzhou, Fujian, 350000, PR China
| | - Yunqiang Yu
- Department of Cardiovascular Disease, 900 Hospital of The Joint Logistics Team, 156 North Road, West 2nd Ring Road, Fuzhou, Fujian, 350000, PR China
| | - Zhurong Luo
- Department of Cardiovascular Disease, 900 Hospital of The Joint Logistics Team, 156 North Road, West 2nd Ring Road, Fuzhou, Fujian, 350000, PR China
| | - Lihong Liao
- Department of Electrocardiogram Room, 900 Hospital of The Joint Logistics Team, 156 North Road, West 2nd Ring Road, Fuzhou, Fujian, 350000, PR China
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CYP2C9, VKORC1, and CYP4F2 polymorphisms and pediatric warfarin maintenance dose: a systematic review and meta-analysis. THE PHARMACOGENOMICS JOURNAL 2019; 20:306-319. [DOI: 10.1038/s41397-019-0117-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2019] [Revised: 09/16/2019] [Accepted: 10/16/2019] [Indexed: 01/19/2023]
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Galvez JM, Restrepo CM, Contreras NC, Alvarado C, Calderón-Ospina CA, Peña N, Cifuentes RA, Duarte D, Laissue P, Fonseca DJ. Creating and validating a warfarin pharmacogenetic dosing algorithm for Colombian patients. PHARMACOGENOMICS & PERSONALIZED MEDICINE 2018; 11:169-178. [PMID: 30410385 PMCID: PMC6198877 DOI: 10.2147/pgpm.s170515] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Purpose Warfarin is an oral anticoagulant associated with adverse reaction to drugs due to wide inter- and intra-individual dosage variability. Warfarin dosage has been related to non-genetic and genetic factors. CYP2C9 and VKORC1 gene polymorphisms affect warfarin metabolism and dosage. Due to the central role of populations’ ethnical and genetic origin on warfarin dosage variability, novel algorithms for Latin American subgroups are necessary to establish safe anticoagulation therapy. Patients and methods We genotyped CYP2C9*2 (c.430C > T), CYP2C9*3 (c.1075A > C), CYP4F2 (c.1297G > A), and VKORC1 (−1639 G > A) polymorphisms in 152 Colombian patients who received warfarin. We evaluated the impact on the variability of patients’ warfarin dose requirements. Multiple linear regression analysis, using genetic and non-genetic variables, was used for creating an algorithm for optimal warfarin maintenance dose. Results Median weekly prescribed warfarin dosage was significantly lower in patients having the VKORC1-1639 AA genotype and poor CYP2C9*2/*2,*2/*3 metabolizers than their wild-type counterparts. We found a 2.3-fold increase in mean dose for normal sensitivity patients (wild-type VKORC1/CYP2C9 genotypes) compared to the other groups (moderate and high sensitivity); 31.5% of the patients in our study group had warfarin sensitivity-related genotypes. The estimated regression equation accounted for 44.4% of overall variability in regard to warfarin maintenance dose. The algorithm was validated, giving 45.9% correlation (R2=0.459). Conclusion Our results describe and validate the first algorithm for predicting warfarin maintenance in a Colombian mestizo population and have contributed toward the understanding of pharmacogenetics in a Latin American population subgroup.
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Affiliation(s)
- Jubby Marcela Galvez
- GENIUROS Research Group, Center For Research in Genetics and Genomics - CIGGUR, School of Medicine and Health Sciences, Universidad del Rosario, Bogotá, Colombia,
| | - Carlos Martin Restrepo
- GENIUROS Research Group, Center For Research in Genetics and Genomics - CIGGUR, School of Medicine and Health Sciences, Universidad del Rosario, Bogotá, Colombia,
| | - Nora Constanza Contreras
- GENIUROS Research Group, Center For Research in Genetics and Genomics - CIGGUR, School of Medicine and Health Sciences, Universidad del Rosario, Bogotá, Colombia,
| | - Clara Alvarado
- GENIUROS Research Group, Center For Research in Genetics and Genomics - CIGGUR, School of Medicine and Health Sciences, Universidad del Rosario, Bogotá, Colombia,
| | - Carlos-Alberto Calderón-Ospina
- GENIUROS Research Group, Center For Research in Genetics and Genomics - CIGGUR, School of Medicine and Health Sciences, Universidad del Rosario, Bogotá, Colombia,
| | - Nidia Peña
- GENIUROS Research Group, Center For Research in Genetics and Genomics - CIGGUR, School of Medicine and Health Sciences, Universidad del Rosario, Bogotá, Colombia,
| | - Ricardo A Cifuentes
- Area of Basic Sciences, College of Medicine, Universidad Militar Nueva Granada, Bogotá, Colombia
| | - Daniela Duarte
- GENIUROS Research Group, Center For Research in Genetics and Genomics - CIGGUR, School of Medicine and Health Sciences, Universidad del Rosario, Bogotá, Colombia,
| | - Paul Laissue
- GENIUROS Research Group, Center For Research in Genetics and Genomics - CIGGUR, School of Medicine and Health Sciences, Universidad del Rosario, Bogotá, Colombia,
| | - Dora Janeth Fonseca
- GENIUROS Research Group, Center For Research in Genetics and Genomics - CIGGUR, School of Medicine and Health Sciences, Universidad del Rosario, Bogotá, Colombia,
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Maagdenberg H, Bierings MB, van Ommen CH, van der Meer FJM, Appel IM, Tamminga RYJ, le Cessie S, Swen JJ, van der Straaten T, de Boer A, Maitland-van der Zee AH. The pediatric acenocoumarol dosing algorithm: the Children Anticoagulation and Pharmacogenetics Study. J Thromb Haemost 2018; 16:1732-1742. [PMID: 29935043 DOI: 10.1111/jth.14211] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2018] [Indexed: 12/18/2022]
Abstract
Essentials A pediatric pharmacogenetic dosing algorithm for acenocoumarol has not yet been developed. We conducted a multicenter retrospective follow-up study in children in the Netherlands. Body surface area and indication explained 45.0% of the variability in dose requirement. Adding the genotypes of VKORC1, CYP2C9 and CYP2C18 to the algorithm increased this to 61.8%. SUMMARY Background The large variability in dose requirement of vitamin K antagonists is well known. For warfarin, pediatric dosing algorithms have been developed to predict the correct dose for a patient; however, this is not the case for acenocoumarol. Objectives To develop dosing algorithms for pediatric patients receiving acenocoumarol with and without genetic information. Methods The Children Anticoagulation and Pharmacogenetics Study was designed as a multicenter retrospective follow-up study in Dutch anticoagulation clinics and children's hospitals. Pediatric patients who used acenocoumarol between 1995 and 2014 were selected for inclusion. Clinical information and saliva samples for genotyping of the genes encoding cytochrome P450 (CYP) 2C9, vitamin K epoxide reductase complex subunit 1 (VKORC1), CYP4F2, CYP2C18 and CYP3A4 were collected. Linear regression was used to analyze their association with the log mean stable dose. A stable period was defined as three or more consecutive International Normalized Ratio measurements within the therapeutic range over a period of ≥ 3 weeks. Results In total, 175 patients were included in the study, of whom 86 had a stable period and no missing clinical information (clinical cohort; median age 8.9 years, and 49% female). For 80 of these 86 patients, genetic information was also available (genetic cohort). The clinical algorithm, containing body surface area and indication, explained 45.0% of the variability in dose requirement of acenocoumarol. After addition of the VKORC1, CYP2C9, and CYP2C18 genotypes to the algorithm, this increased to 61.8%. Conclusions These findings show that clinical factors had the largest impact on the required dose of acenocoumarol in pediatric patients. Nevertheless, genetic factors, and especially VKORC1, also explained a significant part of the variability.
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Affiliation(s)
- H Maagdenberg
- Division of Pharmacoepidemiology and Clinical Pharmacology, Faculty of Science, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Utrecht, the Netherlands
| | - M B Bierings
- Department of Pediatric Hematology and Stem Cell Transplantation, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht, the Netherlands
| | - C H van Ommen
- Department of Pediatric Oncology/Hematology, Sophia Children's Hospital, Erasmus University Medical Center, Rotterdam, the Netherlands
| | - F J M van der Meer
- Department of Thrombosis and Hemostasis, Leiden University Medical Center, Leiden, the Netherlands
| | - I M Appel
- Department of Pediatric Oncology/Hematology, Sophia Children's Hospital, Erasmus University Medical Center, Rotterdam, the Netherlands
| | - R Y J Tamminga
- Department of Pediatric Hematology, University Medical Center Groningen, Groningen, the Netherlands
| | - S le Cessie
- Department of Medical Statistics, Leiden University Medical Center, Leiden, the Netherlands
- Department of Clinical Epidemiology, Leiden University Medical Center, Leiden, the Netherlands
| | - J J Swen
- Department of Clinical Pharmacy and Toxicology, Leiden University Medical Center, Leiden, the Netherlands
| | - T van der Straaten
- Department of Clinical Pharmacy and Toxicology, Leiden University Medical Center, Leiden, the Netherlands
| | - A de Boer
- Division of Pharmacoepidemiology and Clinical Pharmacology, Faculty of Science, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Utrecht, the Netherlands
| | - A H Maitland-van der Zee
- Division of Pharmacoepidemiology and Clinical Pharmacology, Faculty of Science, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Utrecht, the Netherlands
- Department of Respiratory Medicine, Amsterdam Medical Center, University of Amsterdam, Amsterdam, the Netherlands
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Wang Z, Zhang L, Huang P, Gu X, Xie X, Wang Y, Li W, Zeng Q. Weight and the vitamin K expoxide reductase 1 genotype primarily contribute to the warfarin dosing in pediatric patients with Kawasaki disease. Thromb Res 2018; 167:32-36. [PMID: 29778033 DOI: 10.1016/j.thromres.2018.05.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2018] [Revised: 04/30/2018] [Accepted: 05/04/2018] [Indexed: 11/25/2022]
Abstract
INTRODUCTION Warfarin therapy is recommended in children with giant coronary artery aneurysms (GCAAs) after Kawasaki disease (KD). Large individual variability makes it difficult to predict the warfarin dose. Polymorphisms in the vitamin K expoxide reductase 1 (VKORC1) and cytochrome P4502C9 (CYP2C9) genes have been reported to influence the warfarin dose. We investigated the effects of the VKORC1 and CYP2C9 genotypes on the warfarin dose in pediatric patients with giant CAAs after KD. We attempted to create a dosing algorithm. MATERIALS AND METHODS The clinical and genetic data of patients were documented. VKORC1 (rs 9923231) and CYP2C9 *3 (rs 1057910) were genotyped using TaqMan real-time polymerase chain reaction. A linear regression analysis was performed to evaluate the contribution of clinical and genetic factors to the warfarin maintenance dose. RESULTS Forty-seven patients were enrolled. Patients with the CT or CC genotype of VKORC1 had a relatively higher warfarin dose than did those with the TT genotype (p < 0.05). Three patients with CYP2C9*1/*3 had a lower warfarin dose than did those with the wild CYP2C9*1/*1 genotype, but the difference did not reach significance (p > 0.05). Weight and the VKORC1 genotype predominantly contributed to the warfarin dose, with 33.0% and 11.2% of variability, respectively. The observed warfarin dose was correlated with the predicted dose based on the algorithm used in our study (r = 0.45, p < 0.01). CONCLUSIONS Weight and the VKORC1 genotype primarily determined the warfarin dose in Chinese pediatric patients with KD. Further studies are warranted to verify the findings of our study.
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Affiliation(s)
- Zhouping Wang
- Pediatric Center, Zhujiang Hospital, Southern Medical University, Guangzhou, Guangdong Province, China; Department of Pediatric Cardiology, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, Guangdong Province, China
| | - Li Zhang
- Department of Pediatric Cardiology, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, Guangdong Province, China
| | - Ping Huang
- Department of Pediatric Cardiology, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, Guangdong Province, China
| | - Xiaoqiong Gu
- Department of Pediatric Cardiology, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, Guangdong Province, China
| | - Xiaofei Xie
- Department of Pediatric Cardiology, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, Guangdong Province, China
| | - Yanfei Wang
- Department of Pediatric Cardiology, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, Guangdong Province, China
| | - Wei Li
- Department of Pediatric Cardiology, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, Guangdong Province, China
| | - Qiyi Zeng
- Pediatric Center, Zhujiang Hospital, Southern Medical University, Guangzhou, Guangdong Province, China.
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Newall F, Branchford B, Male C. Anticoagulant prophylaxis and therapy in children: current challenges and emerging issues. J Thromb Haemost 2018; 16:196-208. [PMID: 29316202 DOI: 10.1111/jth.13913] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
This review is aimed at describing the unique challenges of anticoagulant prophylaxis and treatment in children, and highlighting areas for research for improving clinical outcomes of children with thromboembolic disease. The evidence presented demonstrates the challenges of advancing the evidence base informing optimal management of thromboembolic disease in children. Recent observational studies have identified risk factors for venous thromboembolism in children, but there are few interventional studies assessing the benefit-risk balance of using thromboprophylaxis in risk-stratified clinical subgroups. A risk level-based framework is proposed for administering mechanical and pharmacological thromboprophylaxis. More research is required to refine the assignment of risk levels. The anticoagulants currently used predominantly in children are unfractionated heparin, low molecular weight heparin, and vitamin K antagonists. There is a paucity of robust evidence on the age-specific pharmacology of these agents, and their efficacy and safety for prevention and treatment of thrombosis in children. The available literature is heterogeneous, reflecting age-specific differences, and the various clinical settings for anticoagulation in children. Monitoring assays and target ranges are not well established. Nevertheless, weight-based dosing appears to achieve acceptable outcomes in most indications. Given the limitations of the classical anticoagulants for children, there is great interest in the direct oral anticoagulants (DOACs), whose properties appear to be particularly suitable for children. All DOACs currently approved for adults have Pediatric Investigation Plans ongoing or planned. These are generating age-specific formulations and systematic dosing information. The ongoing pediatric studies still have to establish whether DOACs have a positive benefit-risk balance in the various pediatric indications and age groups.
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Affiliation(s)
- F Newall
- Clinical Haematology & Nursing Research, Royal Children's Hospital, Haematology Research Group, Murdoch Childrens Research Institute and Departments of Paediatrics and Nursing, The University of Melbourne, Melbourne, Australia
| | - B Branchford
- Department of Pediatrics, Section of Hematology/Oncology/Bone Marrow Transplant and the Hemophilia and Thrombosis Center, School of Medicine and Center for Cancer and Blood Disorders, Children's Hospital Colorado, University of Colorado, Aurora, CO, USA
| | - C Male
- Haemostasis and Thrombosis Unit, Department of Paediatrics and Adolescent Medicine, Medical University of Vienna, Vienna, Austria
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Víquez Beita AK, Whayne TF. Higher Risk of Bleeding in Asians Presenting With ST Elevation Myocardial Infarction (STEMI). Angiology 2017; 69:461-463. [DOI: 10.1177/0003319717731961] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
| | - Thomas F. Whayne
- Gill Heart and Vascular Institute, University of Kentucky, Lexington, KY, USA
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GGCX-Associated Phenotypes: An Overview in Search of Genotype-Phenotype Correlations. Int J Mol Sci 2017; 18:ijms18020240. [PMID: 28125048 PMCID: PMC5343777 DOI: 10.3390/ijms18020240] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2016] [Revised: 12/21/2016] [Accepted: 01/13/2017] [Indexed: 11/16/2022] Open
Abstract
Gamma-carboxylation, performed by gamma-glutamyl carboxylase (GGCX), is an enzymatic process essential for activating vitamin K-dependent proteins (VKDP) with important functions in various biological processes. Mutations in the encoding GGCX gene are associated with multiple phenotypes, amongst which vitamin K-dependent coagulation factor deficiency (VKCFD1) is best known. Other patients have skin, eye, heart or bone manifestations. As genotype–phenotype correlations were never described, literature was systematically reviewed in search of patients with at least one GGCX mutation with a phenotypic description, resulting in a case series of 47 patients. Though this number was too low for statistically valid correlations—a frequent problem in orphan diseases—we demonstrate the crucial role of the horizontally transferred transmembrane domain in developing cardiac and bone manifestations. Moreover, natural history suggests ageing as the principal determinant to develop skin and eye symptoms. VKCFD1 symptoms seemed more severe in patients with both mutations in the same protein domain, though this could not be linked to a more perturbed coagulation factor function. Finally, distinct GGCX functional domains might be dedicated to carboxylation of very specific VKDP. In conclusion, this systematic review suggests that there indeed may be genotype–phenotype correlations for GGCX-related phenotypes, which can guide patient counseling and management.
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