1
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Zhang S, Zhao M, Zhong S, Niu J, Zhou L, Zhu B, Su H, Cao W, Xing Q, Yan H, Han X, Fu Q, Li Q, Chen L, Yang F, Zhang N, Wu H, He L, Qin S. Association between CYP2C9 and VKORC1 genetic polymorphisms and efficacy and safety of warfarin in Chinese patients. Pharmacogenet Genomics 2024; 34:105-116. [PMID: 38470454 DOI: 10.1097/fpc.0000000000000526] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/13/2024]
Abstract
OBJECTIVES Genetic variation has been a major contributor to interindividual variability of warfarin dosage requirement. The specific genetic factors contributing to warfarin bleeding complications are largely unknown, particularly in Chinese patients. In this study, 896 Chinese patients were enrolled to explore the effect of CYP2C9 and VKORC1 genetic variations on both the efficacy and safety of warfarin therapy. METHODS AND RESULTS Univariate analyses unveiled significant associations between two specific single nucleotide polymorphisms rs1057910 in CYP2C9 and rs9923231 in VKORC1 and stable warfarin dosage ( P < 0.001). Further, employing multivariate logistic regression analysis adjusted for age, sex and height, the investigation revealed that patients harboring at least one variant allele in CYP2C9 exhibited a heightened risk of bleeding events compared to those with the wild-type genotype (odds ratio = 2.16, P = 0.04). Moreover, a meta-analysis conducted to consolidate findings confirmed the associations of both CYP2C9 (rs1057910) and VKORC1 (rs9923231) with stable warfarin dosage. Notably, CYP2C9 variant genotypes were significantly linked to an increased risk of hemorrhagic complications ( P < 0.00001), VKORC1 did not demonstrate a similar association. CONCLUSION The associations found between specific genetic variants and both stable warfarin dosage and bleeding risk might be the potential significance of gene detection in optimizing warfarin therapy for improving patient efficacy and safety.
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Affiliation(s)
- Suli Zhang
- Bio-X Institutes, Key Laboratory for the Genetics of Developmental and Neuropsychiatric Disorders (Ministry of Education), Shanghai Jiao Tong University, Shanghai
| | - Mingzhe Zhao
- Affiliated Mental Health Center & Hangzhou Seventh People's Hospital, Zhejiang University School of Medicine, Hangzhou
| | - Shilong Zhong
- Department of Pharmacy, Guangdong Provincial People's Hospital, Guangdong
| | - Jiamin Niu
- Department of Cardiology, Jinan City People's Hospital, Jinan
| | - Lijuan Zhou
- Translational Medicine Center, Zhengzhou Central Hospital Affiliated to Zhengzhou University, Zhengzhou
| | - Bin Zhu
- Shanghai Baio Technology Co., Ltd., Shanghai
| | - Haili Su
- Department of Cardiology, Huhhot First Hospital, Huhhot
| | - Wei Cao
- Translational Medicine Center, Zhengzhou Central Hospital Affiliated to Zhengzhou University, Zhengzhou
| | - Qinghe Xing
- Institutes of Biomedical Sciences, Fudan University
| | - Hongli Yan
- Reproductive, Medicine Center, Changhai Hospital, Navy Medical University, Shanghai
| | - Xia Han
- Department of Cardiology, Jinan City People's Hospital, Jinan
| | - Qihua Fu
- Pediatric Translational Medicine Institute, Shanghai Children's Medical Center, School of Medicine, Shanghai Jiao Tong University, Shanghai
- Shanghai Key Laboratory of Clinical Molecular Diagnostics for Pediatrics, Shanghai
| | - Qiang Li
- Department of Geriatrics, Shandong Provincial Third Hospital, Shandong
| | - Luan Chen
- Bio-X Institutes, Key Laboratory for the Genetics of Developmental and Neuropsychiatric Disorders (Ministry of Education), Shanghai Jiao Tong University, Shanghai
| | - Fan Yang
- Bio-X Institutes, Key Laboratory for the Genetics of Developmental and Neuropsychiatric Disorders (Ministry of Education), Shanghai Jiao Tong University, Shanghai
| | - Na Zhang
- Bio-X Institutes, Key Laboratory for the Genetics of Developmental and Neuropsychiatric Disorders (Ministry of Education), Shanghai Jiao Tong University, Shanghai
| | - Hao Wu
- Bio-X Institutes, Key Laboratory for the Genetics of Developmental and Neuropsychiatric Disorders (Ministry of Education), Shanghai Jiao Tong University, Shanghai
| | - Lin He
- Bio-X Institutes, Key Laboratory for the Genetics of Developmental and Neuropsychiatric Disorders (Ministry of Education), Shanghai Jiao Tong University, Shanghai
| | - Shengying Qin
- Bio-X Institutes, Key Laboratory for the Genetics of Developmental and Neuropsychiatric Disorders (Ministry of Education), Shanghai Jiao Tong University, Shanghai
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2
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Gao W, Zhang Z, Guan Z, Chen W, Li Z. Developing Chinese race-specific warfarin dose prediction algorithms. Int J Clin Pharm 2023:10.1007/s11096-023-01565-1. [PMID: 36991222 DOI: 10.1007/s11096-023-01565-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2023] [Accepted: 02/24/2023] [Indexed: 03/31/2023]
Abstract
BACKGROUND Numerous genotype-guided warfarin dosing algorithms have been developed to individualize warfarin doses, but they can only explain 47-52% of the variability. AIM This study aimed to develop new warfarin algorithms suitable to predict the stable warfarin dose for the Chinese population and to compare their prediction performance with those of the most commonly used algorithms. METHOD Multiple linear regression analysis with the warfarin optimal dose (WOD), logarithm (log) WOD, 1/WOD, and [Formula: see text], respectively, as the dependent variables were performed to deduce a new warfarin algorithm (NEW-Warfarin). WOD was the stable dose that maintained the international normalized ratio (INR) within the target range (2.0-3.0). Three major genotype-guided warfarin dosing algorithms were selected and compared against NEW-Warfarin predictive performance using the mean absolute error (MAE). Furthermore, patients were divided into five groups according to warfarin indications [atrial fibrillation (AF), pulmonary embolism (PE), cardiac-related disease (CRD), deep vein thrombosis (DVT), and other diseases (OD)]. Multiple linear regression analyses were also performed for each group. RESULTS The regression equation with [Formula: see text] as the dependent variable had the highest coefficient of determination (R2 = 0.489). The NEW-Warfarin had the best predictive accuracy compared to the three algorithms selected. Group analysis, according to indications, showed that the R2 of the five groups were PE (0.902) > DVT (0.608) > CRD (0.569) > OD (0.436) > AF (0.424). CONCLUSION Dosing algorithms based on warfarin indications are more suitable for predicting warfarin doses. Our research provides a novel strategy to develop indication-specific warfarin dosing algorithms to improve the efficacy and safety of warfarin prescribing.
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Affiliation(s)
- Weiqi Gao
- Shanxi Bethune Hospital, Shanxi Academy of Medical Sciences, Tongji Shanxi Hospital, Third Hospital of Shanxi Medical University, 99 Longcheng Street, Taiyuan, 030032, China
- Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China
| | - Zhijiao Zhang
- School of Pharmacy, Shanxi Medical University, Taiyuan, 030001, China
| | - Zhaobo Guan
- School of Pharmacy, Shanxi Medical University, Taiyuan, 030001, China
| | - Weihong Chen
- Shanxi Bethune Hospital, Shanxi Academy of Medical Sciences, Tongji Shanxi Hospital, Third Hospital of Shanxi Medical University, 99 Longcheng Street, Taiyuan, 030032, China
- Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China
| | - Zhihong Li
- Shanxi Bethune Hospital, Shanxi Academy of Medical Sciences, Tongji Shanxi Hospital, Third Hospital of Shanxi Medical University, 99 Longcheng Street, Taiyuan, 030032, China.
- Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China.
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3
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Qian M, Zhao H, Lou Y, Wang J, Wang S, Wang Z, Ou H, Li J, Yang F, Bai L, Lv H, Peng X, Chen X, Yang X. Establishment of prediction algorithm for the Honghe minority group based on warfarin maintenance dose. Pharmacogenomics 2022; 23:619-626. [PMID: 35880564 DOI: 10.2217/pgs-2022-0038] [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
Background: CYP2C9 and VKORC1 are important factors in warfarin metabolism. The authors explored the effects of these genetic polymorphisms and clinical factors on a warfarin maintenance dose and then established the prediction algorithm for Honghe minorities in China. Materials & methods: Quantitative fluorescence PCR determined the mutation frequency of CYP2C9 and VKORC1-1639 G>A alleles. The authors collected the relevant clinical factors, including age, gender, body surface area (BSA), international normalized ratio value, daily warfarin dose, comorbidity and concomitant prescriptions. Results: The mean values of BSA and international normalized ratio in Honghe minorities were lower than in Han Chinese (p = 0.00). The genotype of CYP2C9*1/*1 and VKORC1-1639 AA was the main allele, the mutationfrequency of VKORC1-1639 AA and the number of male of Honghe minorities were lower than that of Han Chinese (p = 0.013 and p = 0.04). The significances of the effect on actual warfarin dose value were gender, VKORC1 AA mutant, CYP2C9*1/*1, age, hypertension and BSA sequentially. Conclusion: By multiple linear regression analysis with genetic and clinical factors, the authors determined a prediction algorithm for adjusting individual dosing of warfarin in this population. Clinical trial registration number: ChiCTR2100051778.
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Affiliation(s)
- Mengjiao Qian
- Department of Cardiothoracic Surgery, The Yunnan South Central Hospital (The First People's Hospital of Honghe Prefecture), Mengzi, Yunnan, 661100, PR China
| | - Huan Zhao
- Department of Neurology, The Yunnan South Central Hospital (The First People's Hospital of Honghe Prefecture), Mengzi, Yunnan, 661100, PR China
| | - Yunli Lou
- Department of Medical Records & Statistics, The Yunnan South Central Hospital (The First People's Hospital of Honghe Prefecture), Mengzi, Yunnan, 661100, PR China
| | - Jing Wang
- Department of Cardiothoracic Surgery, The Yunnan South Central Hospital (The First People's Hospital of Honghe Prefecture), Mengzi, Yunnan, 661100, PR China
| | - Sibo Wang
- Department of Cardiothoracic Surgery, The Yunnan South Central Hospital (The First People's Hospital of Honghe Prefecture), Mengzi, Yunnan, 661100, PR China
| | - Zhongyin Wang
- Department of Cardiothoracic Surgery, The Yunnan South Central Hospital (The First People's Hospital of Honghe Prefecture), Mengzi, Yunnan, 661100, PR China
| | - Haibo Ou
- Department of Cardiothoracic Surgery, The Yunnan South Central Hospital (The First People's Hospital of Honghe Prefecture), Mengzi, Yunnan, 661100, PR China
| | - Jun Li
- Department of Cardiothoracic Surgery, The Yunnan South Central Hospital (The First People's Hospital of Honghe Prefecture), Mengzi, Yunnan, 661100, PR China
| | - Fajian Yang
- Clinical Pharmacy Laboratory, Department of Pharmacy, The Yunnan South Central Hospital (The First People's Hospital of Honghe Prefecture), Mengzi, Yunnan, 661100, PR China
| | - Lingying Bai
- Clinical Pharmacy Laboratory, Department of Pharmacy, The Yunnan South Central Hospital (The First People's Hospital of Honghe Prefecture), Mengzi, Yunnan, 661100, PR China
| | - Hong Lv
- Clinical Pharmacy Laboratory, Department of Pharmacy, The Yunnan South Central Hospital (The First People's Hospital of Honghe Prefecture), Mengzi, Yunnan, 661100, PR China
| | - Xuguan Peng
- Department of Cardiothoracic Surgery, The Yunnan South Central Hospital (The First People's Hospital of Honghe Prefecture), Mengzi, Yunnan, 661100, PR China
| | - Xiao Chen
- Department of Cardiothoracic Surgery, The Yunnan South Central Hospital (The First People's Hospital of Honghe Prefecture), Mengzi, Yunnan, 661100, PR China
| | - Xiubing Yang
- Department of Cardiovascular Surgery, Beijing Anzhen Hospital, Capital Medical University, Bejing, 100029, PR China
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4
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Huang Q, Cao L, Luo N, Qian H, Wei M, Xue L, Zhou Q, Zou B, Tan L, Chu Y, Ma X, Wang C, Wu H, Zhang L, Sun L, Li D, Fan X, Miao L, Zhou G. Predicting Range of Initial Warfarin Dose Based on Pharmacometabolomic and Genetic Inputs. Clin Pharmacol Ther 2021; 110:1585-1594. [PMID: 34460938 DOI: 10.1002/cpt.2407] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Accepted: 08/22/2021] [Indexed: 12/29/2022]
Abstract
Anticoagulation response to warfarin during the initial stage of therapy varies among individuals. In this study, we aimed to combine pharmacometabolomic and pharmacogenetic data to predict interindividual variation in warfarin response, and, on this basis, suggest an initial daily dose range. The baseline metabolic profiles, genotypes, and clinical information of 160 patients with heart valve disease served as the variables of the function of the last international normalized ratio measured before a patient's discharge (INRday7 ) to screen for potential biomarkers. The partial least-squares model showed that two baseline metabolites (uridine and guanosine), one single-nucleotide variation (VKORC1), and four clinical parameters (weight, creatinine level, amiodarone usage, and initial daily dose) had good predictive power for INRday7 (R2 = 0.753 for the training set, 0.643 for the test set). With these biomarkers, a machine learning algorithm (two-dimensional linear discriminant analysis-multinomial logit model) was used to predict the subgroups with extremely warfarin-sensitive or less warfarin-sensitive patients with a prediction accuracy of 91% for the training set and 90% for the test set, indicating that individual responses to warfarin could be effectively predicted. Based on this model, we have successfully designed an algorithm,"IniWarD," for predicting an effective dose range in the initial 7-day warfarin therapy. The results indicate that the daily dose range suggested by the IniWarD system is more appropriate than that of the conventional genotype-based method, and the risk of bleeding or thrombus due to warfarin could thus be avoided.
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Affiliation(s)
- Qing Huang
- Department of Clinical Pharmacy, Jinling Hospital, State Key Laboratory of Analytical Chemistry for Life Science & Jiangsu Key Laboratory of Molecular Medicine, Medical School of Nanjing University, Nanjing, China.,National Medical Products Administration, Key Laboratory for Impurity Profile of Chemical Drugs, Jiangsu Institute for Food and Drug Control, Nanjing, China
| | - Ling Cao
- National Medical Products Administration, Key Laboratory for Impurity Profile of Chemical Drugs, Jiangsu Institute for Food and Drug Control, Nanjing, China
| | - Nan Luo
- Department of Clinical Pharmacy, Jinling Hospital, State Key Laboratory of Analytical Chemistry for Life Science & Jiangsu Key Laboratory of Molecular Medicine, Medical School of Nanjing University, Nanjing, China.,Key Laboratory of Drug Quality Control and Pharmacovigilance, Ministry of Education, School of Pharmacy, China Pharmaceutical University, Nanjing, China
| | - Hanyu Qian
- National Medical Products Administration, Key Laboratory for Impurity Profile of Chemical Drugs, Jiangsu Institute for Food and Drug Control, Nanjing, China
| | - Meng Wei
- Department of Clinical Pharmacy, Jinling Hospital, State Key Laboratory of Analytical Chemistry for Life Science & Jiangsu Key Laboratory of Molecular Medicine, Medical School of Nanjing University, Nanjing, China
| | - Ling Xue
- Department of Clinical Pharmacology, The First Affiliated Hospital of Soochow University, Suzhou, China
| | - Qiang Zhou
- Department of Clinical Pharmacy, Jinling Hospital, State Key Laboratory of Analytical Chemistry for Life Science & Jiangsu Key Laboratory of Molecular Medicine, Medical School of Nanjing University, Nanjing, China
| | - Bingjie Zou
- Department of Clinical Pharmacy, Jinling Hospital, State Key Laboratory of Analytical Chemistry for Life Science & Jiangsu Key Laboratory of Molecular Medicine, Medical School of Nanjing University, Nanjing, China.,Key Laboratory of Drug Quality Control and Pharmacovigilance, Ministry of Education, School of Pharmacy, China Pharmaceutical University, Nanjing, China
| | - Li Tan
- National Medical Products Administration, Key Laboratory for Impurity Profile of Chemical Drugs, Jiangsu Institute for Food and Drug Control, Nanjing, China
| | - Yanan Chu
- Department of Clinical Pharmacy, Jinling Hospital, State Key Laboratory of Analytical Chemistry for Life Science & Jiangsu Key Laboratory of Molecular Medicine, Medical School of Nanjing University, Nanjing, China
| | - Xueping Ma
- Department of Clinical Pharmacy, Jinling Hospital, State Key Laboratory of Analytical Chemistry for Life Science & Jiangsu Key Laboratory of Molecular Medicine, Medical School of Nanjing University, Nanjing, China
| | - Changtian Wang
- Department of Cardio-Thoracic Surgery, Jinling Hospital, The First School of Clinical Medicine, Southern Medical University, Nanjing, China
| | - Haiwei Wu
- Department of Cardio-Thoracic Surgery, Jinling Hospital, The First School of Clinical Medicine, Southern Medical University, Nanjing, China
| | - Lei Zhang
- Department of Cardio-Thoracic Surgery, Jinling Hospital, The First School of Clinical Medicine, Southern Medical University, Nanjing, China
| | - Lei Sun
- Department of Cardio-Thoracic Surgery, Jinling Hospital, The First School of Clinical Medicine, Southern Medical University, Nanjing, China
| | - Demin Li
- Department of Cardio-Thoracic Surgery, Jinling Hospital, The First School of Clinical Medicine, Southern Medical University, Nanjing, China
| | - Xialei Fan
- National Medical Products Administration, Key Laboratory for Impurity Profile of Chemical Drugs, Jiangsu Institute for Food and Drug Control, Nanjing, China
| | - Liyan Miao
- Department of Clinical Pharmacology, The First Affiliated Hospital of Soochow University, Suzhou, China
| | - Guohua Zhou
- Department of Clinical Pharmacy, Jinling Hospital, State Key Laboratory of Analytical Chemistry for Life Science & Jiangsu Key Laboratory of Molecular Medicine, Medical School of Nanjing University, Nanjing, China.,Department of Cardio-Thoracic Surgery, Jinling Hospital, The First School of Clinical Medicine, Southern Medical University, Nanjing, China
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5
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Gao W, Li Z, Chen W, Zhang S. Performance Evaluation of Warfarin Dose Prediction Algorithms and Effects of Clinical Factors on Warfarin Dose in Chinese Patients. Ther Drug Monit 2021; 43:527-535. [PMID: 34250965 DOI: 10.1097/ftd.0000000000000880] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Accepted: 02/06/2021] [Indexed: 11/25/2022]
Abstract
BACKGROUND The clinical utility of warfarin dose prediction algorithms remains controversial, our purpose is to evaluate the performance of warfarin dose prediction algorithms and the effects of clinical factors on warfarin dose in Chinese patients. METHODS Clinical data of 217 patients who received warfarin treatment were used to assess 6 warfarin dose prediction algorithms (OHNO, IWPC [International Warfarin Pharmacogenetics Consortium], HUANG, KIM, BRESS, and MIAO). The predicted dose (PD) was compared with the warfarin optimal dose (WOD, defined as the dose that maintains the international normalized ratio within the target range of 2.0-3.0). A multiple regression analysis with WOD as the dependent variable was performed to evaluate the effects of clinical factors on warfarin dose. RESULTS The mean absolute error analysis ranked the predictive accuracies of the algorithms as OHNO > IWPC > HUANG > KIM > BRESS > MIAO. Stratified analysis indicated that HUANG most accurately predicted that patients required lower WODs (≤3 mg/d), whereas OHNO was the most effective in predicting medium WODs (3-5 mg/d). KIM was effective in predicting high WODs (>5 mg/d). Multiple linear regression analysis showed that VKORC1 (rs9923231) and body mass index were significantly positively correlated with WOD, whereas concurrent atrial fibrillation status, CYP2C9*3 (rs1057910), and sex were significantly negatively correlated with WOD. CONCLUSIONS In Chinese patients, OHNO should be given priority during the prediction and selection of warfarin dose. When using OHNO to predict warfarin dose (≤3 mg/d or >5 mg/d), HUANG or KIM algorithms can provide precise predictions. At the same time, physicians should pay close attention to clinical factors, such as VKORC1 (rs9923231), concurrent atrial fibrillation status, CYP2C9*3 (rs1057910), body mass index, and sex, to improve warfarin dose adjustment strategies in Chinese patients.
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Affiliation(s)
- Weiqi Gao
- School of Pharmacy, Shanxi Medical University, Taiyuan, China; and
- Department of Pharmacy, Shanxi Bethune Hospital, Third Hospital of Shanxi Medical University, Shanxi Academy of Medical Sciences, Taiyuan, China
| | - Zhihong Li
- Department of Pharmacy, Shanxi Bethune Hospital, Third Hospital of Shanxi Medical University, Shanxi Academy of Medical Sciences, Taiyuan, China
| | - Weihong Chen
- Department of Pharmacy, Shanxi Bethune Hospital, Third Hospital of Shanxi Medical University, Shanxi Academy of Medical Sciences, Taiyuan, China
| | - Shuqiu Zhang
- School of Pharmacy, Shanxi Medical University, Taiyuan, China; and
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6
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Wang D, Dai DP, Wu H, Chong J, Lü Y, Yin R, Zhao X, Zhao A, Yang J, Chen H. Effects of rare CYP2C9 alleles on stable warfarin doses in Chinese Han patients with atrial fibrillation. Pharmacogenomics 2020; 21:1021-1031. [PMID: 32893731 DOI: 10.2217/pgs-2020-0051] [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] [Indexed: 12/13/2022] Open
Abstract
Aim: Gene polymorphisms are critical in warfarin dosing variation. Here, the role of rare CYP2C9 alleles on warfarin doses in Chinese Han patients was investigated. Methods: A retrospective study recruited 681 warfarin treated atrial fibrillation patients. The genetic and clinical data were collected. Dose-related variables were selected by univariate analyses and the warfarin-dosing algorithm was derived by multivariate regression analysis. Results: Three rare CYP2C9 alleles (CYP2C9*13, *16 and *60) were associated with lower stable doses. Inclusion of the rare CYP2C9 alleles in the prediction model added an extra 3.7% warfarin dose predictive power. Conclusion: CYP2C9*13, *16 and *60 was associated with lower stable warfarin doses in Chinese patients. The algorithm including rare CYP2C9 alleles tends to more accurately predict stable warfarin doses.
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Affiliation(s)
- Dongxu Wang
- Cardiovascular Department, Beijing Hospital, National Centre of Gerontology, Beijing, 100730, China
| | - Da-Peng Dai
- The Key Laboratory of Geriatrics, Beijing Hospital, National Centre of Gerontology, Beijing, 100730, China
| | - Hualan Wu
- Cardiovascular Department, Beijing Hospital, National Centre of Gerontology, Beijing, 100730, China
| | - Jia Chong
- Cardiovascular Department, Beijing Hospital, National Centre of Gerontology, Beijing, 100730, China
| | - You Lü
- Cardiovascular Department, Beijing Hospital, National Centre of Gerontology, Beijing, 100730, China
| | - Ruoyun Yin
- Cardiovascular Department, Beijing Hospital, National Centre of Gerontology, Beijing, 100730, China
| | - Xinlong Zhao
- Cardiovascular Department, Beijing Hospital, National Centre of Gerontology, Beijing, 100730, China
| | - Anxu Zhao
- Cardiovascular Department, Beijing Hospital, National Centre of Gerontology, Beijing, 100730, China
| | - Jiefu Yang
- Cardiovascular Department, Beijing Hospital, National Centre of Gerontology, Beijing, 100730, China
| | - Hao Chen
- Cardiovascular Department, Beijing Hospital, National Centre of Gerontology, Beijing, 100730, China
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7
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Cho EH, Lee K, Yang M, Choi R, Baek SY, Sohn I, Kim JS, On YK, Bang OY, Cho HJ, Lee SY. Development and Validation of a Novel Warfarin Dosing Algorithm for Korean Patients With VKORC1 1173C. Ann Lab Med 2020; 40:216-223. [PMID: 31858761 PMCID: PMC6933054 DOI: 10.3343/alm.2020.40.3.216] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2019] [Revised: 08/08/2019] [Accepted: 11/22/2019] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Differences in the performance of suggested warfarin dosing algorithms among different ethnicities and genotypes have been reported; this necessitates the development of an algorithm with enhanced performance for specific population groups. Previous warfarin dosing algorithms underestimated warfarin doses in VKORC1 1173C carriers. We aimed to develop and validate a new warfarin dosing algorithm for Korean patients with VKORC1 1173C. METHODS A total of 109 patients carrying VKORC1 1173CT (N=105) or 1173CC (N=4) were included in this study. Multiple regression analysis was performed to deduce a new dosing algorithm. Following literature searches for genotype-guided warfarin dosing algorithms, 21 algorithms were selected and evaluated using the correlation coefficient (ρ) of actual dose and estimated dose, mean error, and root mean square error. RESULTS The developed algorithm is as follows: maintenance dose (mg/week)=exp [3.223-0.009×(age)+0.577×(body surface area [BSA])+0.178×(sex)-0.481×(CYP2C9 genotype)+0.227×(VKORC1 genotype)]. Integrated variables explained 44% of the variance in the maintenance dose. The predicted and actual doses showed moderate correlation (ρ=0.641) with the best performance with a mean error of -1.30 mg/week. The proportion of underestimated groups was 17%, which was lower than with the other algorithms. CONCLUSIONS This is the first study to develop and validate a warfarin dosing algorithm based on data from VKORC1 1173C carriers; it showed superior predictive performance compared with previously published algorithms.
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Affiliation(s)
- Eun Hye Cho
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Kyunghoon Lee
- Department of Laboratory Medicine, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Mina Yang
- Department of Laboratory Medicine, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine, Changwon, Korea
| | - Rihwa Choi
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.,Department of Laboratory Medicine, Green Cross Laboratories, Yongin, Korea
| | - Sun Young Baek
- Statistics and Data Center, Samsung Medical Center, Seoul, Korea
| | - Insuk Sohn
- Statistics and Data Center, Samsung Medical Center, Seoul, Korea
| | - June Soo Kim
- Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Young Keun On
- Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Oh Young Bang
- Department of Neurology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Hyun Jung Cho
- Department of Laboratory Medicine, Konyang University Hospital, Konyang University School of Medicine, Daejeon, Korea.
| | - Soo Youn Lee
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.,Department of Clinical Pharmacology & Therapeutics, Samsung Medical Center, Seoul, Korea.,Department of Health Sciences and Technology, SAIHST, Sungkyunkwan University, Seoul, Korea.
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8
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Verification of pharmacogenomics-based algorithms to predict warfarin maintenance dose using registered data of Japanese patients. Eur J Clin Pharmacol 2019; 75:901-911. [DOI: 10.1007/s00228-019-02656-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2018] [Accepted: 02/22/2019] [Indexed: 10/27/2022]
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9
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Al-Eitan LN, Almasri AY, Khasawneh RH. Impact of CYP2C9 and VKORC1 Polymorphisms on Warfarin Sensitivity and Responsiveness in Jordanian Cardiovascular Patients during the Initiation Therapy. Genes (Basel) 2018; 9:genes9120578. [PMID: 30486437 PMCID: PMC6316567 DOI: 10.3390/genes9120578] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2018] [Revised: 11/21/2018] [Accepted: 11/21/2018] [Indexed: 01/31/2023] Open
Abstract
Warfarin is an oral anticoagulant frequently used in the treatment of different cardiovascular diseases. Genetic polymorphisms in the CYP2C9 and VKORC1 genes have produced variants with altered catalytic properties. A total of 212 cardiovascular patients were genotyped for 17 Single Nucleotide Polymorphisms (SNPs) within the CYP2C9 and VKORC1 genes. This study confirmed a genetic association of the CYP2C9*3 and VKORC1 rs10871454, rs8050894, rs9934438, and rs17708472 SNPs with warfarin sensitivity. This study also found an association between CYP2C9 and VKORC1 genetic haplotype blocks and warfarin sensitivity. The initial warfarin dose was significantly related to the CYP2C9*3 polymorphism and the four VKORC1 SNPs (p < 0.001). There were significant associations between rs4086116 SNP and TAT haplotype within CYP2C9 gene and rs17708472 SNP and CCGG haplotype within VKORC1 gene and warfarin responsiveness. However, possessing a VKORC1 variant allele was found to affect the international normalized ratio (INR) outcomes during initiation of warfarin therapy. In contrast, there was a loose association between the CYP2C9 variant and INR measurements. These findings can enhance the current understanding of the great variability in response to warfarin treatment in Arabs.
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Affiliation(s)
- Laith N Al-Eitan
- Department of Applied Biological Sciences, Jordan University of Science and Technology, Irbid 22110, Jordan.
- Department of Biotechnology and Genetic Engineering, Jordan University of Science and Technology, Irbid 22110, Jordan.
| | - Ayah Y Almasri
- Department of Applied Biological Sciences, Jordan University of Science and Technology, Irbid 22110, Jordan.
| | - Rame H Khasawneh
- Department of Hematopathology, King Hussein Medical Center (KHMC), Jordan Royal Medical Services (RMS), Amman 11118, Jordan.
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10
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Shaul C, Blotnick S, Deutsch L, Rosenberg G, Caraco Y. The impact of R353Q genetic polymorphism in coagulation factor VII on the initial anticoagulant effect exerted by warfarin. Eur J Clin Pharmacol 2018; 75:343-350. [PMID: 30411147 DOI: 10.1007/s00228-018-2594-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2018] [Accepted: 10/30/2018] [Indexed: 10/27/2022]
Abstract
BACKGROUND The initial rise in INR following warfarin is attributed to rapid decline in coagulation factor VII (F7). The R353Q polymorphism in F7 accounts for approximately 1/3 of the variability in F7 activity (FVIIc). OBJECTIVE Evaluate the role of R353Q in the initial response to warfarin. METHODS Twenty-eight healthy, males, carrying CYP2C9*1/*1 (n = 14), CYP2C9*1/*2 (n = 4) or CYP2C9*1/*3 (n = 10) genotypes, received single 20 mg warfarin. S&R-warfarin concentrations, INR, and FVIIc were monitored periodically for 7 days. RESULTS Baseline and maximal INR were 5.6% and 33.5% higher among carriers of the RQ (n = 12) as compared with those carrying the RR (n = 16) genotype (p = 0.032, p = 0.003, respectively). Baseline and nadir FVIIc were 21.6% and 42.0% lower among subjects carrying the RQ as compared with carriers of the RR genotype (p = 0.001, p = 0.007 respectively). In multiple regression analysis, R353Q predicted 36.6% of the variability in peak INR whereas 20.2%, 9.9%, and 5.9% were attributed to VKORC1 genetic polymorphism, cholesterol concentration, and S Warfarin concentration after 24 h, respectively. CONCLUSIONS R353Q genetic polymorphism plays a key role in determining the initial response to warfarin. The incorporation of this genetic variant into warfarin loading algorithm should be further investigated.
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Affiliation(s)
- Chanan Shaul
- Clinical Pharmacology Unit, Division of Medicine, Hadassah-Hebrew University Medical Center, POB 12000, 91120, Jerusalem, Israel.,Institute of Drug Research, School of Pharmacy, Faculty of Medicine, Hebrew University, Jerusalem, Israel
| | - Simcha Blotnick
- Clinical Pharmacology Unit, Division of Medicine, Hadassah-Hebrew University Medical Center, POB 12000, 91120, Jerusalem, Israel
| | - Liat Deutsch
- Clinical Pharmacology Unit, Division of Medicine, Hadassah-Hebrew University Medical Center, POB 12000, 91120, Jerusalem, Israel
| | | | - Yoseph Caraco
- Clinical Pharmacology Unit, Division of Medicine, Hadassah-Hebrew University Medical Center, POB 12000, 91120, Jerusalem, Israel.
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Chumnumwat S, Yi K, Lucksiri A, Nosoongnoen W, Chindavijak B, Chulavatnatol S, Sarapakdi A, Nathisuwan S. Comparative performance of pharmacogenetics-based warfarin dosing algorithms derived from Caucasian, Asian, and mixed races in Thai population. Cardiovasc Ther 2018; 36. [DOI: 10.1111/1755-5922.12315] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/16/2017] [Revised: 11/17/2017] [Accepted: 12/07/2017] [Indexed: 01/16/2023] Open
Affiliation(s)
- Supatat Chumnumwat
- Department of Pharmacy; Faculty of Pharmacy; Mahidol University; Bangkok Thailand
| | - Kong Yi
- Department of Pharmacy; Faculty of Pharmacy; Mahidol University; Bangkok Thailand
| | - Aroonrut Lucksiri
- Department of Pharmaceutical Care; Faculty of Pharmacy; Chiangmai University; Chiangmai Thailand
| | - Wichit Nosoongnoen
- Department of Pharmacy; Faculty of Pharmacy; Mahidol University; Bangkok Thailand
| | - Busba Chindavijak
- Department of Pharmacy; Faculty of Pharmacy; Mahidol University; Bangkok Thailand
| | | | - Ajjima Sarapakdi
- Department of Pharmacy; Faculty of Medicine Siriraj Hospital; Mahidol University; Bangkok Thailand
| | - Surakit Nathisuwan
- Department of Pharmacy; Faculty of Pharmacy; Mahidol University; Bangkok Thailand
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12
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Yang J, Gao L, Zhang Y, Wang H, Lu C, Zhao Y, Xu Q, Xu B, Zhang Y, Yin T. Estimation of the warfarin dose with a pharmacogenetic refinement algorithm in Chinese patients mainly under low-intensity warfarin anticoagulation. Thromb Haemost 2017; 108:1132-40. [DOI: 10.1160/th12-05-0362] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2012] [Accepted: 08/14/2012] [Indexed: 12/28/2022]
Abstract
SummaryPharmacogenetic (PG) dosing algorithms have been confirmed to predict warfarin therapeutic dose more accurately;however, most of them are based on standard intensity of warfarin anticoagulation, and their utility outside this range is limited. This study was designed to develop and validate a PG refinement algorithm in Chinese patients mainly under low-intensity warfarin anticoagulation. Consented Chinese-Han patients (n=310) under stable warfarin treatment were randomly divided into a derivation (n=207) and a validation cohort (n=103), with 83% and 80% of the patients under low-intensity anticoagulation, respectively. In the derivation cohort, a PG algorithm was constructed on the basis of genotypes (CYP2C9*3 and VKORC1–1639A/G) and clinical data. After integrating additional covariates of international normalised ratio (INR) values (INR on day 4 of therapy and target INR) and genotype of CYP4F2 (rs2108622), a PG refinement algorithm was established and explained 54% of warfarin dose variability. In the validation cohort, warfarin dose prediction was more accurate (p <0.01) with the PG refinement algorithm than with the PG algorithm and the fixed dose approach (3 mg/day). In the entire cohort, the PG refinement algorithm could accurately identify larger proportions of patients with lower dose requirement (≤2 mg/day) and higher dose requirement (≥4 mg/day) than did the PG algorithm. In conclusion, PG refinement algorithm integrating early INR response and three genotypes CYP2C9*3, VKORC1–1639A/G, CYP4F2 rs2108622) improves the accuracy of warfarin dose prediction in Chinese patients mainly under low-intensity anticoagulation.
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Ang HX, Chan SL, Sani LL, Quah CB, Brunham LR, Tan BOP, Winther MD. Pharmacogenomics in Asia: a systematic review on current trends and novel discoveries. Pharmacogenomics 2017; 18:891-910. [DOI: 10.2217/pgs-2017-0009] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
While early pharmacogenomic studies have primarily been carried out in Western populations, there has been a notable increase in the number of Asian studies over the past decade. We systematically reviewed all pharmacogenomic studies conducted in Asia published before 2016 to highlight trends and identify research gaps in Asia. We observed that pharmacogenomic research in Asia was dominated by larger developed countries, notably Japan and Korea, and mainly driven by local researchers. Studies were focused on drugs acting on the CNS, chemotherapeutics and anticoagulants. Significantly, several novel pharmacogenomic associations have emerged from Asian studies. These developments are highly encouraging for the strength of regional scientific and clinical community and propound the importance of discovery studies in different populations.
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Affiliation(s)
- Hazel Xiaohui Ang
- Genome Institute of Singapore, Agency for Science, Technology & Research, Singapore
| | - Sze Ling Chan
- Translational Laboratory in Genetic Medicine, Agency for Science, Technology & Research, Singapore
| | - Levana L Sani
- Genome Institute of Singapore, Agency for Science, Technology & Research, Singapore
| | | | - Liam R Brunham
- Translational Laboratory in Genetic Medicine, Agency for Science, Technology & Research, Singapore
- Department of Medicine, Centre for Heart Lung Innovation, University of British Columbia, Vancouver, BC, Canada
| | - Boon Ooi Patrick Tan
- Genome Institute of Singapore, Agency for Science, Technology & Research, Singapore
- Cancer Science Institute of Singapore, National University of Singapore, Singapore
- Cancer & Stem Cell Biology Program, Duke-NUS Graduate Medical School, Singapore
- Division of Cellular & Molecular Research, National Cancer Centre Singapore, Singapore
| | - Michael D Winther
- Genome Institute of Singapore, Agency for Science, Technology & Research, Singapore
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Wattanachai N, Kaewmoongkun S, Pussadhamma B, Makarawate P, Wongvipaporn C, Kiatchoosakun S, Vannaprasaht S, Tassaneeyakul W. The impact of non-genetic and genetic factors on a stable warfarin dose in Thai patients. Eur J Clin Pharmacol 2017; 73:973-980. [PMID: 28550460 PMCID: PMC5508045 DOI: 10.1007/s00228-017-2265-8] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Accepted: 05/09/2017] [Indexed: 11/24/2022]
Abstract
Purpose The aim of this study was to investigate the contributions of non-genetic and genetic factors on the variability of stable warfarin doses in Thai patients. Methods A total of 250 Thai patients with stable warfarin doses were enrolled in the study. Demographics and clinical data, e.g., age, body mass index, indications for warfarin and concomitant medications, were documented. Four single nucleotide polymorphisms in the VKORC1 − 1639G > A, CYP2C9*3, CYP4F2 rs2108622, and UGT1A1 rs887829 genes were detected from gDNA using TaqMan allelic discrimination assays. Results The patients with variant genotypes of VKORC1 − 1639G > A required significantly lower warfarin stable weekly doses (SWDs) than those with wild-type genotype (p < 0.001). Similarly, the patients with CYP2C9*3 variant allele required significantly lower warfarin SWDs than those with homozygous wild-type (p = 0.006). In contrast, there were no significant differences in the SWDs between the patients who carried variant alleles of CYP4F2 rs2108622 and UGT1A1 rs887829 as compared to wild-type allele carriers. Multivariate analysis, however, showed that CYP4F2 rs2108622 TT genotype accounted for a modest part of warfarin dose variability (1.2%). In contrast, VKORC1 − 1639G > A, CYP2C9*3, CYP4F2 rs2108622 genotypes and non-genetic factors accounted for 51.3% of dose variability. Conclusions VKORC1 − 1639G > A, CYP2C9*3, and CYP4F2 rs2108622 polymorphisms together with age, body mass index, antiplatelet drug use, amiodarone use, and current smoker status explained 51.3% of individual variability in stable warfarin doses. In contrast, the UGT1A1 rs887829 polymorphism did not contribute to dose variability. Electronic supplementary material The online version of this article (doi:10.1007/s00228-017-2265-8) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Nitsupa Wattanachai
- Department of Pharmacology, Faculty of Medicine, Khon Kaen University, Khon Kaen, 40002, Thailand.
| | - Sutthida Kaewmoongkun
- Department of Pharmacology, Faculty of Medicine, Khon Kaen University, Khon Kaen, 40002, Thailand
| | - Burabha Pussadhamma
- Division of Cardiology, Queen Sirikit Heart Center of the Northeast, Department of Medicine, Faculty of Medicine, Khon Kaen University, Khon Kaen, 40002, Thailand
| | - Pattarapong Makarawate
- Division of Cardiology, Queen Sirikit Heart Center of the Northeast, Department of Medicine, Faculty of Medicine, Khon Kaen University, Khon Kaen, 40002, Thailand
| | - Chaiyasith Wongvipaporn
- Division of Cardiology, Queen Sirikit Heart Center of the Northeast, Department of Medicine, Faculty of Medicine, Khon Kaen University, Khon Kaen, 40002, Thailand
| | - Songsak Kiatchoosakun
- Division of Cardiology, Queen Sirikit Heart Center of the Northeast, Department of Medicine, Faculty of Medicine, Khon Kaen University, Khon Kaen, 40002, Thailand
| | - Suda Vannaprasaht
- Department of Pharmacology, Faculty of Medicine, Khon Kaen University, Khon Kaen, 40002, Thailand
| | - Wichittra Tassaneeyakul
- Department of Pharmacology, Faculty of Medicine, Khon Kaen University, Khon Kaen, 40002, Thailand
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Lin M, Yu L, Qiu H, Wang Q, Zhang J, Song H. Verification of five pharmacogenomics-based warfarin administration models. Indian J Pharmacol 2017; 48:258-63. [PMID: 27298494 PMCID: PMC4899997 DOI: 10.4103/0253-7613.182876] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/04/2022] Open
Abstract
Objective: This study aims to screen and validate five individual warfarin dosing models (four Asian model algorithms, namely, Ohno, Wen, Miao, Huang, and the algorithm of International Warfarin Pharmacogenetic Consortium, namely IWPC algorithm) with the aim of evaluating their accuracy, practicality, and safety. Materials and Methods: Patients’ CYP2C9*3 and VKORC1–1639G >A genes were genotyped, and patient-related information and steady warfarin doses were recorded. The difference between the predicted dose and actual maintenance dose of each model was compared. Results: The prediction accuracies of the Huang and Wen models were the highest. In terms of clinical practicality, the Huang model rated the highest for the low-dose group, whereas the Ohno and IWPC models rated the highest for the middle-dose group. The models tended to markedly overpredict the doses in the low-dose group, especially the IWPC model. The Miao model tended to severely underpredict the doses in the middle-dose group, whereas no model exhibited severe overprediction. Conclusions: Since none of the models ranked high for all the three criteria considered, the impact of various factors should be thoroughly considered before selecting the most appropriate model for the region's population.
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Affiliation(s)
- Meiqin Lin
- Department of Pharmacy, Fuzhou General Hospital of Nanjing Command, PLA, Fuzhou 350025, China
| | - Liangping Yu
- Department of Pharmacy, Zhongshan Hospital Affiliated to Xiamen University, Xiamen 361100, China
| | - Hanfan Qiu
- Department of Cardiac Surgery, Union Hospital, Fujian Medical University, Fuzhou 350001, China
| | - Qimin Wang
- Department of Cardiac Surgery, Union Hospital, Fujian Medical University, Fuzhou 350001, China
| | - Jing Zhang
- Department of Pharmacy, Fuzhou General Hospital of Nanjing Command, PLA, Fuzhou 350025, China
| | - Hongtao Song
- Department of Pharmacy, Fuzhou General Hospital of Nanjing Command, PLA, Fuzhou 350025, China
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Development of a novel individualized warfarin dose algorithm based on a population pharmacokinetic model with improved prediction accuracy for Chinese patients after heart valve replacement. Acta Pharmacol Sin 2017; 38:434-442. [PMID: 28216623 DOI: 10.1038/aps.2016.163] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2016] [Accepted: 11/15/2016] [Indexed: 12/25/2022] Open
Abstract
The gene-guided dosing strategy of warfarin generally leads to over-dose in patients at doses lower than 2 mg/kg, and only 50% of individual variability in daily stable doses can be explained. In this study, we developed a novel population pharmacokinetic (PK) model based on a warfarin dose algorithm for Han Chinese patients with valve replacement for improving the dose prediction accuracy, especially in patients with low doses. The individual pharmacokinetic (PK) parameter - apparent clearance of S- and R-warfarin (CLs) was obtained after establishing and validating the population PK model from 296 recruited patients with valve replacement. Then, the individual estimation of CLs, VKORC1 genotypes, the steady-state international normalized ratio (INR) values and age were used to describe the maintenance doses by multiple linear regression for 144 steady-state patients. The newly established dosing algorithm was then validated in an independent group of 42 patients and was compared with other dosing algorithms for the accuracy and precision of prediction. The final regression model developed was as follows: Dose=-0.023×AGE+1.834×VKORC1+0.952×INR+2.156×CLs (the target INR value ranges from 1.8 to 2.5). The validation of the algorithm in another group of 42 patients showed that the individual variation rate (71.6%) was higher than in the gene-guided dosing models. The over-estimation rate in patients with low doses (<2 mg/kg) was lower than the other dosing methods. This novel dosing algorithm based on a population PK model improves the predictive performance of the maintenance dose of warfarin, especially for low dose (<2 mg/d) patients.
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Yang M, Choi R, Kim JS, On YK, Bang OY, Cho HJ, Lee SY. Evaluation of 16 genotype-guided Warfarin Dosing Algorithms in 310 Korean Patients Receiving Warfarin Treatment: Poor Prediction Performance in VKORC1 1173C Carriers. Clin Ther 2016; 38:2666-2674.e1. [DOI: 10.1016/j.clinthera.2016.10.014] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2016] [Revised: 10/19/2016] [Accepted: 10/31/2016] [Indexed: 10/20/2022]
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18
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Elevated prothrombin time/international normalized ratio associated with concurrent administration of regorafenib and warfarin in a patient with advanced colorectal cancer. J Pharm Health Care Sci 2016; 2:15. [PMID: 27398225 PMCID: PMC4937497 DOI: 10.1186/s40780-016-0050-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2016] [Accepted: 06/20/2016] [Indexed: 12/19/2022] Open
Abstract
Background Regorafenib and its metabolites may inhibit the activities of several CYP or UDP-glucuronosyltransferase isoforms, including that of CYP2C9. Therefore, pharmacological agents that are CYP2C9 substrates may show elevated circulating levels and enhanced drug efficacy when concurrently used with regorafenib. Previous studies showed that the area under the plasma concentration-time curve of warfarin, which is the substrate for CYP2C9, increased upon co-administration of regorafenib. However, there are no reports indicating that the anticoagulant effects of warfarin increased upon co-administration of regorafenib. Case presentation We report a case of a 76-year-old man with liver metastasis of colon cancer. He was treated with regorafenib at a dosage of 120 mg daily on days 1 to 21 every 4 weeks as a third-line therapy. He had a history of acute myocardial infarction and had taken 2 mg warfarin daily. Three weeks after the treatment began, PT/INR values markedly increased, although there was no hemorrhage. Administration of regorafenib and warfarin was discontinued, and then PT/INR rapidly decreased. Warfarin administration was restarted (0.5 mg daily) and the dose was increased up to 1.5 mg daily. The patient’s PT/INR values exhibited a tendency to increase when concurrently used with regorafenib, the dose of which was reduced to 80 mg daily on days 1 to 14 every 3 weeks at a physician's discretion. Conclusions The clinical course of this patient suggested that PT/INR might increase during concurrent use of warfarin and regorafenib. Therefore, PT/INR should be periodically monitored during the concurrent use of warfarin and regorafenib.
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Cho SM, Lee KY, Choi JR, Lee KA. Development and Comparison of Warfarin Dosing Algorithms in Stroke Patients. Yonsei Med J 2016; 57:635-40. [PMID: 26996562 PMCID: PMC4800352 DOI: 10.3349/ymj.2016.57.3.635] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/14/2015] [Revised: 08/04/2015] [Accepted: 09/25/2015] [Indexed: 11/27/2022] Open
Abstract
PURPOSE The genes for cytochrome P450 2C9 (CYP2C9) and vitamin K epoxide reductase complex subunit 1 (VKORC1) have been identified as important genetic determinants of warfarin dosing and have been studied. We developed warfarin algorithm for Korean patients with stroke and compared the accuracy of warfarin dose prediction algorithms based on the pharmacogenetics. MATERIALS AND METHODS A total of 101 patients on stable maintenance dose of warfarin were enrolled. Warfarin dosing algorithm was developed using multiple linear regression analysis. The performance of all the algorithms was characterized with coefficient of determination, determined by linear regression, and the mean of percent deviation was used to predict doses from the actual dose. In addition, we compared the performance of the algorithms using percentage of predicted dose falling within ±20% of clinically observed doses and dividing the patients into a low-dose group (≤3 mg/day), an intermediate-dose group (3-7 mg/day), and high-dose group (≥7 mg/day). RESULTS A new developed algorithms including the variables of age, body weight, and CYP2C9 and VKORC1 genotype. Our algorithm accounted for 51% of variation in the warfarin stable dose, and performed best in predicting dose within 20% of actual dose and intermediate-dose group. CONCLUSION Our warfarin dosing algorithm may be useful for Korean patients with stroke. Further studies to elucidate clinical utility of genotype-guided dosing and find the additional genetic association are necessary.
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Affiliation(s)
- Sun-Mi Cho
- Department of Laboratory Medicine, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
| | - Kyung-Yul Lee
- Department of Neurology, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
| | - Jong Rak Choi
- Department of Laboratory Medicine, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
| | - Kyung-A Lee
- Department of Laboratory Medicine, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
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Sun X, Yu WY, Ma WLE, Huang LH, Yang GP. Impact of the CYP4F2 gene polymorphisms on the warfarin maintenance dose: A systematic review and meta-analysis. Biomed Rep 2016; 4:498-506. [PMID: 27073641 DOI: 10.3892/br.2016.599] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2015] [Accepted: 01/28/2016] [Indexed: 11/06/2022] Open
Abstract
Warfarin is an oral anticoagulant with significant interpatient variability in dosage. A large number of studies have confirmed that the individual warfarin dose is mainly affected by the cytochrome P450 complex subunit 2C9 and vitamin K epoxide reductase complex subunit 1. However, the association between cytochrome P450 4F2 (CYP4F2) gene polymorphisms and warfarin dosage in the Asian population remains controversial. To investigate the impact of the CYP4F2 polymorphism rs2108622 (p.V433M) on warfarin dose requirement, a systematic review and meta-analysis were conducted. According to the strict inclusion and exclusion criteria set, a comprehensive literature search was performed, and the studies published before August 5, 2015 were searched for in PubMed, EMBASE and the China National Knowledge Infrastructure databases. The references were checked by two independent reviewers. The association between the warfarin maintenance dose and CYP4F2 polymorphism was analyzed. Twenty-two studies were included in the meta-analysis. Compared with the CYP4F2 genotype CC, carriers of the CT and TT genotypes required a 9 [95% confidence interval (CI): 6.0-13.0] and 20% (95% CI, 13.0-27.0) higher warfarin dose, respectively. In the combined analysis, T carriers (CT+TT) required an 11% (95% CI, 8.0-14.0) higher warfarin dose compared to the CC genotype. In addition, there was a 10% (95% CI, 5.0-15.0) higher warfarin dose in TT carriers compared to the CT genotype (all P<0.05). The results of the meta-analysis suggest that the effects of the CYP4F2 polymorphism on individual warfarin dose have a statistically significant difference, and the effect degree is variable in the subgroups. Further studies are expected to explore whether the pharmacogenetics model including the CYP4F2 polymorphism can strengthen the prediction of warfarin dose.
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Affiliation(s)
- Xue Sun
- Center of Clinical Pharmacology, The Third Xiangya Hospital of Central South University, Changsha, Hunan 410013, P.R. China; School of Pharmaceutical Science, Central South University, Changsha, Hunan 410013, P.R. China
| | - Wan-Ying Yu
- Center of Clinical Pharmacology, The Third Xiangya Hospital of Central South University, Changsha, Hunan 410013, P.R. China; School of Pharmaceutical Science, Central South University, Changsha, Hunan 410013, P.R. China
| | - Wan-LE Ma
- Center of Clinical Pharmacology, The Third Xiangya Hospital of Central South University, Changsha, Hunan 410013, P.R. China
| | - Li-Hua Huang
- Center for Medical Experiments, The Third Xiangya Hospital of Central South University, Changsha, Hunan 410013, P.R. China
| | - Guo-Ping Yang
- Center of Clinical Pharmacology, The Third Xiangya Hospital of Central South University, Changsha, Hunan 410013, P.R. China
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Xu H, Su S, Tang W, Wei M, Wang T, Wang D, Ge W. Comparison of the Performance of the Warfarin Pharmacogenetics Algorithms in Patients with Surgery of Heart Valve Replacement and Heart Valvuloplasty. Thromb Res 2015; 136:552-9. [DOI: 10.1016/j.thromres.2015.06.032] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2015] [Revised: 06/12/2015] [Accepted: 06/30/2015] [Indexed: 12/14/2022]
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Peng Q, Huang S, Chen X, Yuan Y, Yu Y, Tao L, Zhang Z, Xu M. Validation of warfarin pharmacogenetic algorithms in 586 Han Chinese patients. Pharmacogenomics 2015; 16:1465-74. [PMID: 26255607 DOI: 10.2217/pgs.15.87] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
AIM To compare the accuracy of the nine selected algorithms for predicting warfarin dose with 586 Han Chinese patients. MATERIALS & METHODS Genotyping of VKORC1 1639G>A, CYP2C9*2 and CYP2C9*3 variants was performed. Both the mean absolute error and ideal estimation value were used for comparison. RESULTS The top three performers were from East Asians. The algorithms from Caucasians generally performed better in the medium-dose subgroup (>3 and <7 mg/day), while the algorithms from East Asians generally performed better in the low-dose subgroup (≤ 3 mg/day). None of the algorithms performed well in the high-dose subgroup (≥ 7 mg/day). CONCLUSION Algorithms built for specific ethnic groups and preassigned-dose groups are suggested for better prediction.
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Affiliation(s)
- Qi Peng
- Cardiac Surgery, Wuhan Asia Heart Hospital, 753 Jinghan Ave, Jianghan District, Wuhan, Hubei, 430022, China
| | - Shujun Huang
- Hubei Vidagen Gene Technology Co., Ltd, Building C6-208, 666 Gaoxin Ave, Donghu High-Tech Developmental District, Wuhan, Hubei, 430075, China
| | - Xiaoying Chen
- Department of Cardiology, Wuhan Asia Heart Hospital, 753 Jinghan Ave, Jianghan District, Wuhan, Hubei, 430022, China
| | - Yayan Yuan
- Hubei Vidagen Gene Technology Co., Ltd, Building C6-208, 666 Gaoxin Ave, Donghu High-Tech Developmental District, Wuhan, Hubei, 430075, China
| | - Yajun Yu
- Hubei Vidagen Gene Technology Co., Ltd, Building C6-208, 666 Gaoxin Ave, Donghu High-Tech Developmental District, Wuhan, Hubei, 430075, China
| | - Liang Tao
- Cardiac Surgery, Wuhan Asia Heart Hospital, 753 Jinghan Ave, Jianghan District, Wuhan, Hubei, 430022, China
| | - Zhenlu Zhang
- Clinical Test Center, Wuhan Asia Heart Hospital, 753 Jinghan Ave, Jianghan District, Wuhan, Hubei, 430022, China
| | - Mousheng Xu
- Hubei Vidagen Gene Technology Co., Ltd, Building C6-208, 666 Gaoxin Ave, Donghu High-Tech Developmental District, Wuhan, Hubei, 430075, China
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Impact of gamma-glutamyl carboxylase gene polymorphisms on warfarin dose requirement: A systematic review and meta-analysis. Thromb Res 2015; 135:739-47. [DOI: 10.1016/j.thromres.2015.01.029] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2014] [Revised: 12/11/2014] [Accepted: 01/30/2015] [Indexed: 01/11/2023]
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An acenocoumarol dosing algorithm exploiting clinical and genetic factors in South Indian (Dravidian) population. Eur J Clin Pharmacol 2014; 71:173-81. [PMID: 25519826 DOI: 10.1007/s00228-014-1791-x] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2014] [Accepted: 12/03/2014] [Indexed: 02/03/2023]
Abstract
OBJECTIVE The objective of this study was to determine the influence of CYP2C9, VKORC1, CYP4F2, and GGCX genetic polymorphisms on mean daily dose of acenocoumarol in South Indian patients and to develop a new pharmacogenetic algorithm based on clinical and genetic factors. METHODS Patients receiving acenocoumarol maintenance therapy (n = 230) were included in the study. Single nucleotide polymorphisms (SNP) of CYP2C9, VKORC1, CYP4F2, and GGCX were genotyped by real-time polymerase chain reaction (RT-PCR) method. RESULTS The mean daily acenocoumarol maintenance dose was found to be 3.7 ± 2.3 (SD) mg/day. The CYP2C9 *1*2, CYP2C9 *1*3, and CYP2C9 *2*3 variant genotypes significantly reduced the dose by 56.7 % (2.0 mg), 67.6 % (1.6 mg), and 70.3 % (1.5 mg) than wild-type carriers 4.1 mg, p < 0.0001. The genetic variants of CYP2C9 and GGCX (rs11676382) were found to be associated with lower acenocoumarol dose, whereas CYP4F2 (rs2108622) was associated with higher doses. Age, body mass index (BMI), variation of CYP2C9, VKORC1, CYP4F2, and GGCX were the major determinants of acenocoumarol maintenance dose, accounting for 61.8 % of its variability (adjusted r (2) = 0.615, p < 0.0001). Among the VKORC1 variants, rs9923231 alone contributed up to 28.6 % of the acenocoumarol dose variation. CONCLUSION VKORC1 rs9923231 polymorphism had the highest impact on acenocoumarol daily dose. A new pharmacogenetic algorithm was established to determine the acenocoumarol dose in South Indian population.
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Ichihara N, Ishigami T, Umemura S. Effect of impaired renal function on the maintenance dose of warfarin in Japanese patients. J Cardiol 2014; 65:178-84. [PMID: 25442049 DOI: 10.1016/j.jjcc.2014.08.008] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/27/2014] [Revised: 07/22/2014] [Accepted: 08/10/2014] [Indexed: 02/06/2023]
Abstract
BACKGROUND Chronic kidney disease (CKD) alters dose-effect relationship not only of drugs eliminated by the kidney but also of some drugs metabolized by the liver and not renally excreted. It is not known whether impaired renal function alters dose-effect relationship of warfarin in Asian patients. It is also unknown whether the maintenance dose of warfarin can be predicted more accurately by incorporating renal function in Asians. METHODS This was a cross-sectional study of patients receiving constant doses of warfarin who had PT-INR within 1.5-3.0 for 3 months or longer. RESULTS In a total of 137 participants, the estimated creatinine clearance (eCrCl) was 62.5±25.5 [ml/min] and the warfarin dose was 3.21±1.46 [mg/day] (both mean±standard deviation). There was a significant correlation between warfarin dose and eCrCl (p<0.0001, r(2)=0.23). In a stepwise linear regression with the maintenance dose of warfarin as the dependent variable, eCrCl as well as age, body weight, intra-individual average prothrombin time/international normalized ratio (PT-INR), and genotype of VKORC1 -1639 G>A polymorphism were chosen as independent variables. The coefficient of determination (r(2)) of this formula was 0.47. A regression equation with all the same explanatory variables except for eCrCl had an r(2) of 0.41. CONCLUSIONS The maintenance warfarin dose was positively correlated with kidney function as represented by eCrCl in Japanese patients. Incorporating eCrCl improved accuracy of predicting warfarin maintenance dose in this population.
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Affiliation(s)
- Naoaki Ichihara
- Division of General Internal Medicine & Primary Care, Brigham and Women's Hospital, Boston, USA.
| | - Tomoaki Ishigami
- Department of Medical Science and Cardiorenal Medicine, Yokohama City University Graduate School of Medicine, Yokohama, Japan
| | - Satoshi Umemura
- Department of Medical Science and Cardiorenal Medicine, Yokohama City University Graduate School of Medicine, Yokohama, Japan
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Li X, Liu R, Yan H, Tang J, Yin JY, Mao XY, Yang F, Luo ZY, Tan SL, He H, Chen XP, Liu ZQ, Li Z, Zhou HH, Zhang W. Effect of CYP2C9-VKORC1 interaction on warfarin stable dosage and its predictive algorithm. J Clin Pharmacol 2014; 55:251-7. [PMID: 25187307 DOI: 10.1002/jcph.392] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2014] [Accepted: 08/29/2014] [Indexed: 11/10/2022]
Abstract
This study aimed to identify the effect of CYP2C9-VKORC1 interaction on warfarin dosage requirement and its predictive algorithm by investigating four populations. Generalized linear model was used to evaluate the relationship between the interaction and warfarin stable dosage (WSD), whereas multiple linear regression analysis was applied to construct the WSD predictive algorithm. To evaluate the effect of CYP2C9-VKORC1 interaction on the predictive algorithms, we compared the algorithms with and without the interaction. The interaction was significantly associated with WSD in the Chinese and White cohorts (P values < 0.05). In the algorithms that considered the interaction, the predictive success rates improved by only 0.12% in the Chinese patients and by a maximum of 0.02% in the White patients under four different CYP2C9 classifications. Thus, VKORC1-CYP2C9 interaction can affect WSD. However, the discrepancy between the predictive results obtained using the predictive algorithm with and without CYP2C9-VKORC1 interaction was negligible and can therefore be disregarded.
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Affiliation(s)
- Xi Li
- Department of Clinical Pharmacology, Xiangya Hospital, Central South University, Institute of Clinical Pharmacology, Central South University, Hunan Key Laboratory of Pharmacogenetics, Changsha, 410078, P.R. China
| | - Rong Liu
- Department of Clinical Pharmacology, Xiangya Hospital, Central South University, Institute of Clinical Pharmacology, Central South University, Hunan Key Laboratory of Pharmacogenetics, Changsha, 410078, P.R. China
| | - Han Yan
- Department of Clinical Pharmacology, Xiangya Hospital, Central South University, Institute of Clinical Pharmacology, Central South University, Hunan Key Laboratory of Pharmacogenetics, Changsha, 410078, P.R. China
| | - Jie Tang
- Department of Clinical Pharmacology, Xiangya Hospital, Central South University, Institute of Clinical Pharmacology, Central South University, Hunan Key Laboratory of Pharmacogenetics, Changsha, 410078, P.R. China
| | - Ji-Ye Yin
- Department of Clinical Pharmacology, Xiangya Hospital, Central South University, Institute of Clinical Pharmacology, Central South University, Hunan Key Laboratory of Pharmacogenetics, Changsha, 410078, P.R. China
| | - Xiao-Yuan Mao
- Department of Clinical Pharmacology, Xiangya Hospital, Central South University, Institute of Clinical Pharmacology, Central South University, Hunan Key Laboratory of Pharmacogenetics, Changsha, 410078, P.R. China
| | - Fang Yang
- Department of Epidemiology and Biostatistics, School of Public Health, Central South University, Changsha, 410078, Hunan, China
| | - Zhi-Yin Luo
- Department of Clinical Pharmacology, Xiangya Hospital, Central South University, Institute of Clinical Pharmacology, Central South University, Hunan Key Laboratory of Pharmacogenetics, Changsha, 410078, P.R. China
| | - Sheng-Lan Tan
- Clinical Pharmacy and Pharmacology Research Institute, The Second Xiangya Hospital, Central South University, 139 Middle Renmin Road, Changsha, 410011, Hunan, China
| | - Hui He
- Department of Clinical Pharmacology, Xiangya Hospital, Central South University, Institute of Clinical Pharmacology, Central South University, Hunan Key Laboratory of Pharmacogenetics, Changsha, 410078, P.R. China
| | - Xiao-Ping Chen
- Department of Clinical Pharmacology, Xiangya Hospital, Central South University, Institute of Clinical Pharmacology, Central South University, Hunan Key Laboratory of Pharmacogenetics, Changsha, 410078, P.R. China
| | - Zhao-Qian Liu
- Department of Clinical Pharmacology, Xiangya Hospital, Central South University, Institute of Clinical Pharmacology, Central South University, Hunan Key Laboratory of Pharmacogenetics, Changsha, 410078, P.R. China
| | - Zhi Li
- Department of Clinical Pharmacology, Xiangya Hospital, Central South University, Institute of Clinical Pharmacology, Central South University, Hunan Key Laboratory of Pharmacogenetics, Changsha, 410078, P.R. China
| | - Hong-Hao Zhou
- Department of Clinical Pharmacology, Xiangya Hospital, Central South University, Institute of Clinical Pharmacology, Central South University, Hunan Key Laboratory of Pharmacogenetics, Changsha, 410078, P.R. China
| | - Wei Zhang
- Department of Clinical Pharmacology, Xiangya Hospital, Central South University, Institute of Clinical Pharmacology, Central South University, Hunan Key Laboratory of Pharmacogenetics, Changsha, 410078, P.R. China
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VKORC1 and CYP2C9 genotype distribution in Asian countries. Thromb Res 2014; 134:537-44. [DOI: 10.1016/j.thromres.2014.05.028] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2014] [Revised: 04/04/2014] [Accepted: 05/16/2014] [Indexed: 01/21/2023]
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Jin B, Hong Y, Zhu J, Li Y, Shi HM. The impact of VKORC1-1639G > A genetic polymorphism upon warfarin dose requirement in different ethnic populations. Curr Med Res Opin 2014; 30:1505-11. [PMID: 24708259 DOI: 10.1185/03007995.2014.912982] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
OBJECTIVE Published data on the association between vitamin K epoxide reductase complex 1 (VKORC1)-1639G > A polymorphism and warfarin dose requirement are inconclusive. To derive a more precise estimation of the relationship, a meta-analysis was performed. METHODS AND RESULTS Studies were identified in English-language articles by search of PubMed and Embase database (inception to July 2013). A total of 32 prospective clinical trials involving 5005 patients were identified and included for analysis. Overall, the weighted mean maintenance dosage of warfarin in patients with the -1639AA genotype decreased 2.62 mg/d compared with that in the -1639GG genotype patients (95% CI -3.10 to -2.14; P < 0.00001) when 24 eligible studies were pooled into the meta-analysis. Furthermore, significantly lower warfarin dose requirement was found in patients with GA genotype versus GG genotype (WMD, -1.32; 95% CI -1.67 to -0.96; P < 0.00001). In the subgroup analysis by ethnicity, statistically significant lower maintenance dosage of warfarin in patients with the AA genotype versus GG genotype were found in both Caucasians (WMD, -2.47; 95% CI -2.92 to -2.03; P < 0.00001) and Asians (WMD, -2.84; 95% CI -4.57 to -1.11; P = 0.001). CONCLUSIONS This meta-analysis indicated that the VKORC1-1639G > A genetic polymorphism is associated with the variation of interindividual warfarin dose requirement in different ethnic populations.
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Affiliation(s)
- Bo Jin
- Department of Cardiology, Huashan Hospital, Fudan University , Shanghai , China
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Krishna Kumar D, Shewade DG, Loriot MA, Beaune P, Balachander J, Sai Chandran BV, Adithan C. Effect of CYP2C9, VKORC1, CYP4F2 and GGCX genetic variants on warfarin maintenance dose and explicating a new pharmacogenetic algorithm in South Indian population. Eur J Clin Pharmacol 2013; 70:47-56. [PMID: 24019055 DOI: 10.1007/s00228-013-1581-x] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2013] [Accepted: 08/22/2013] [Indexed: 12/22/2022]
Abstract
OBJECTIVE To determine the influence of genetic polymorphisms on warfarin maintenance dose and to explicate an algorithm using the pharmacogenetic and clinical factors to determine the maintenance and/or starting dose of warfarin in South Indian patients receiving warfarin therapy. METHODS Patients receiving stabilized warfarin therapy (n=257) were included in the study. Single nucleotide polymorphisms (SNPs) of CYP2C9 (rs1799853 and rs1057910), VKORC1 (rs9923231, rs7196161, rs2884737, rs9934438, rs8050894, rs2359612 and rs7294), CYP4F2 (rs2108622) and GGCX (rs11676382) were genotyped by the quantitative real time-PCR method. RESULTS The mean daily maintenance dose of warfarin was found to be 4.7 ± 2.1 mg/day. Patients with the CYP2C9*1/*2, *1/*3 and *2/*3 variant genotypes required a 51.0 (2.8 mg), 60.9 (2.3 mg) and 62.2 % (2.2 mg) lower daily maintenance dose of warfarin, respectively, than those patients with the CYP2C9*1/*1 wild-type genotype (5.2 mg) (p<0.0001). The genetic variants of CYP2C9, VKORC1 and GGCX were associated with decreased warfarin dose, except for rs7196161, rs7294 and rs2108622 which were associated with an increased warfarin dose. Genetic variations of CYP2C9 (*2 and *3), VKORC1 (rs9923231, rs7294, rs9934438 and rs2359612), CYP4F2, GGCX and non-genetic factors such as age, body weight, clinical status (post mechanical valve replacement) could explain up to 62.1 % of the overall variation (adjusted r (2) 60.2 %, p<0.0001) in warfarin maintenance dose. CONCLUSION Genetic polymorphisms of CYP2C9, VKORC1, CYP4F2 and GGCX are important predictive factors of warfarin maintenance dose, and the developed algorithm will be useful to predict the required maintenance and/or starting warfarin dose in South Indian populations.
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Affiliation(s)
- Dhakchinamoorthi Krishna Kumar
- Department of Pharmacology, Jawaharlal Institute of Postgraduate Medical Education & Research (JIPMER), Pondicherry, 605 006, India,
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Chan SL, Suo C, Chia KS, Teo YY. The population attributable fraction as a measure of the impact of warfarin pharmacogenetic testing. Pharmacogenomics 2013; 13:1247-56. [PMID: 22920395 DOI: 10.2217/pgs.12.104] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
AIM We aimed to estimate the population impact of warfarin pharmacogenetic testing (WPGT) across multiple populations. MATERIALS & METHODS We used the expanded International Warfarin Pharmacogenetics Consortium data set and genotype frequencies from HapMap to simulate dose distributions for each CYP2C9/VKORC1 genotype combination in the different races, and calculated the population attributable fraction as a measure of population impact of WPGT. WPGT was compared to both clinical and fixed-dose algorithms to estimate the benefits of WPGT. RESULTS Our dose simulation revealed different dose requirements in difference races and considerable overlap in dose distributions of different genotype combinations. Population attributable fraction calculations suggest that complete implementation of WPGT can reduce inaccurate dosing by 18-24% in white individuals. However black, Japanese and Chinese patients do not benefit from WPGT, especially when compared against a race-specific fixed dose. CONCLUSION Our findings support WPGT in white individuals but not in black, Japanese and Chinese individuals.
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Affiliation(s)
- Sze Ling Chan
- Saw Swee Hock School of Public Health, National University of Singapore, Singapore
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Fung E, Patsopoulos NA, Belknap SM, O'Rourke DJ, Robb JF, Anderson JL, Shworak NW, Moore JH. Effect of genetic variants, especially CYP2C9 and VKORC1, on the pharmacology of warfarin. Semin Thromb Hemost 2012; 38:893-904. [PMID: 23041981 DOI: 10.1055/s-0032-1328891] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The genes encoding the cytochrome P450 2C9 enzyme (CYP2C9) and vitamin K-epoxide reductase complex unit 1 (VKORC1) are major determinants of anticoagulant response to warfarin. Together with patient demographics and clinical information, they account for approximately one-half of the warfarin dose variance in individuals of European descent. Recent prospective and randomized controlled trial data support pharmacogenetic guidance with their use in warfarin dose initiation and titration. Benefits from pharmacogenetics-guided warfarin dosing have been reported to extend beyond the period of initial dosing, with supportive data indicating benefits to at least 3 months. The genetic effects of VKORC1 and CYP2C9 in African and Asian populations are concordant with those in individuals of European ancestry; however, frequency distribution of allelic variants can vary considerably between major populations. Future randomized controlled trials in multiethnic settings using population-specific dosing algorithms will allow us to further ascertain the generalizability and cost-effectiveness of pharmacogenetics-guided warfarin therapy. Additional genome-wide association studies may help us to improve and refine dosing algorithms and potentially identify novel biological pathways.
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Affiliation(s)
- Erik Fung
- Section of Cardiology, Heart & Vascular Center, Lebanon, New Hampshire 03756, USA.
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Liu Y, Yang J, Xu Q, Xu B, Gao L, Zhang Y, Zhang Y, Wang H, Lu C, Zhao Y, Yin T. Comparative performance of warfarin pharmacogenetic algorithms in Chinese patients. Thromb Res 2012; 130:435-40. [DOI: 10.1016/j.thromres.2012.02.003] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2011] [Revised: 01/17/2012] [Accepted: 02/06/2012] [Indexed: 01/28/2023]
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Pavani A, Naushad SM, Mishra RC, Malempati AR, Pinjala R, Kumar TR, Kutala VK. Retrospective evidence for clinical validity of expanded genetic model in warfarin dose optimization in a South Indian population. Pharmacogenomics 2012; 13:869-78. [DOI: 10.2217/pgs.12.62] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Aim: To optimize warfarin dose in patients at risk for thrombotic events, we have recently developed a pharmacogenomic algorithm, which explained 44.9% of the variability in warfarin dose requirements using age, gender, BMI, vitamin K intake, CYP2C9 (*2 and *3) and VKORC1 (*3, *4 and -1639 G>A) as predictors. The aim of the current study is to develop an expanded genetic model that can explain greater percentage of warfarin variability and that has clinical validity. Patients & methods: CYP2C9*8, CYP4F2 V433M, GGCX G8016A and thyroid status were added to an expanded genetic model (n = 243). Results: The expanded genetic model explained 61% of the variability in warfarin dose requirements, has a prediction accuracy of ±11 mg/week and can differentiate warfarin sensitive and warfarin resistant groups efficiently (areas under receiver operating characteristic curves: 0.93 and 0.998, respectively; p < 0.0001). Higher percentage of International Normalized Ratios in therapeutic range (52.68 ± 4.21 vs 43.80 ± 2.27; p = 0.04) and prolonged time in therapeutic range (61.74 ± 3.18 vs 47.75 ± 5.77; p = 0.03) were observed in subjects with a prediction accuracy of <1 mg/day compared with subjects with prediction accuracy >1 mg/day. In the warfarin-resistant group, primary hypothyroidism was found to induce more resistance while in the warfarin-sensitive group, hyperthyroidism was found to increase sensitivity. Conclusion: The expanded genetic model explains greater variability in warfarin dose requirements and it prolongs time in therapeutic range and minimizes out-of-range International Normalized Ratios. Thyroid status also influences warfarin dose adjustments. Original submitted 21 March 2012; Revision submitted 16 April 2012
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Affiliation(s)
- Addepalli Pavani
- Departments of Clinical Pharmacology & Therapeutics, Nizam’s Institute of Medical Sciences, Hyderabad, India
| | - Shaik Mohammad Naushad
- Departments of Clinical Pharmacology & Therapeutics, Nizam’s Institute of Medical Sciences, Hyderabad, India
| | - Ramesh C Mishra
- Cardiothoracic Surgery, Nizam’s Institute of Medical Sciences, Hyderabad, India
| | | | | | - Takallapally Ramesh Kumar
- Departments of Clinical Pharmacology & Therapeutics, Nizam’s Institute of Medical Sciences, Hyderabad, India
| | - Vijay Kumar Kutala
- Departments of Clinical Pharmacology & Therapeutics, Nizam’s Institute of Medical Sciences, Hyderabad, India
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Rathore SS, Agarwal SK, Pande S, Singh SK, Mittal T, Mittal B. Therapeutic dosing of acenocoumarol: proposal of a population specific pharmacogenetic dosing algorithm and its validation in north Indians. PLoS One 2012; 7:e37844. [PMID: 22629463 PMCID: PMC3358293 DOI: 10.1371/journal.pone.0037844] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2012] [Accepted: 04/25/2012] [Indexed: 11/23/2022] Open
Abstract
Objectives To develop a population specific pharmacogenetic acenocoumarol dosing algorithm for north Indian patients and show its efficiency in dosage prediction. Methods Multiple and linear stepwise regression analyses were used to include age, sex, height, weight, body surface area, smoking status, VKORC1 -1639 G>A, CYP4F2 1347 G>A, CYP2C9*2,*3 and GGCX 12970 C>G polymorphisms as variables to generate dosing algorithms. The new dosing models were compared with already reported algorithms and also with the clinical data for various performance measures. Odds ratios for association of genotypes with drug sensitive and resistant groups were calculated. Results The pharmacogenetic dosing algorithm generated by multiple regression analysis explains 41.4% (p-value <0.001) of dosage variation. Validation of the new algorithm showed its predictive ability to be better than the already established algorithms based on similar variables. Its validity in our population is reflected by increased sensitivity, specificity, accuracy and decreased rates of over- and under- estimation in comparison to clinical data. The VKORC1-1639 G>A polymorphism was found to be strongly associated with acenocoumarol sensitivity according to recessive model. Conclusions We have proposed an efficient north India specific pharmacogenetic acenocoumarol dosing algorithm which might become a baseline for personalised medicine approach for treatment of patients in future.
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Affiliation(s)
- Saurabh Singh Rathore
- Department of Genetics, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Lucknow, India
| | - Surendra Kumar Agarwal
- Cardio-Vascular and Thoracic Surgery, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Lucknow, India
| | - Shantanu Pande
- Cardio-Vascular and Thoracic Surgery, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Lucknow, India
| | - Sushil Kumar Singh
- Thoracic and Cardio-Vascular Surgery, Chhatrapati Shahuji Maharaj Medical University, Lucknow, India
| | - Tulika Mittal
- Department of Genetics, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Lucknow, India
| | - Balraj Mittal
- Department of Genetics, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Lucknow, India
- * E-mail:
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Zhang W, Zhang WJ, Zhu J, Kong FC, Li YY, Wang HY, Yang YH, Wang C. Genetic polymorphisms are associated with variations in warfarin maintenance dose in Han Chinese patients with venous thromboembolism. Pharmacogenomics 2012; 13:309-21. [PMID: 22248286 DOI: 10.2217/pgs.11.147] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
AIM Warfarin is a clinical anticoagulant that requires periodic monitoring because it is associated with adverse outcomes. Personalized medicine, which is based on pharmacogenetics, holds great promise in solving these types of problems. It aims to provide the tools and knowledge to tailor drug therapy to an individual patient, with the potential of increasing safety and efficacy of medications. MATERIALS & METHODS In the present study we analyzed genotypes of 14 SNPs for seven genes using DNA from 297 Han Chinese venous thromboembolism patients treated with warfarin. RESULTS Multiple regression analyses revealed that CYP2C9 genotype (p = 0.001), VKORC1 genotype (p < 0.001), age (p < 0.01) and weight (p < 0.001) were all associated with warfarin dose requirements, which can explain 37.4% of the variability of warfarin dose among Han Chinese patients. Meanwhile, in the validation cohort, the predicted warfarin daily dose was calculated using the best model with a 64.5% predicted dose being acceptable (-1 mg/day ≤Δwarfarin dose ≤1 mg/day). CONCLUSION We developed a pharmacogenetic dose algorithm for warfarin treatment that uses genotypes from two genes (VKORC1 and CYP2C9) and clinical variables to predict therapeutic maintenance doses in Chinese patients with venous thromboembolism. The validity of the dosing algorithm was confirmed in a cohort of venous thromboembolism patients on warfarin therapy.
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Affiliation(s)
- Wei Zhang
- Beijing Xiaotangshan Hospital, Xiaotangshan Town, Changping District, Beijing 102211, China
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Otsubo Y, Asahina Y, Noguchi A, Sato Y, Ando Y, Uyama Y. Similarities and differences between US and Japan as to pharmacogenomic biomarker information in drug labels. Drug Metab Pharmacokinet 2011; 27:142-9. [PMID: 22201121 DOI: 10.2133/dmpk.dmpk-11-rv-082] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Pharmacogenomics (PGx) has been utilized as a tool to improve a drug's benefit/risk ratio and the efficiency of drug developments. In order to examine what factors are involved to determine the level of contexts (contents and descriptions) of drug-PGx biomarker information, we graded sections of Japanese package inserts and US drug labels into six levels according to the importance of cautions in regards to clinical practice and compared similarities and differences of the contexts between the two countries. Out of 54 contexts identified, 33 (61%) were graded differently between Japan and the US. The different contexts were mainly related to metabolizing enzymes used in terms of safety, therapeutic areas other than oncology, outcome before 1993, Japan-based companies having marketing authorization and no PGx data on the Japanese population. We describe the potential reasons that could lead to the differences between the two countries such as genetic differences and quantitative evidence in the Japanese population, and also discuss future perspectives to improve PGx utilization in clinical practices in Japan.
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Affiliation(s)
- Yasuto Otsubo
- Office of New Drug II, Pharmaceuticals and Medical Devices Agency (PMDA), Tokyo, Japan
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Kwon A, Jo SH, Im HJ, Jo YA, Park JY, Kang HJ, Kim HS, Cho HC, Lee YK. Pharmacogenetic distribution of warfarin and its clinical significance in Korean patients during initial anticoagulation therapy. J Thromb Thrombolysis 2011; 32:467-73. [DOI: 10.1007/s11239-011-0616-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Shin J, Cao D. Comparison of warfarin pharmacogenetic dosing algorithms in a racially diverse large cohort. Pharmacogenomics 2011; 12:125-34. [PMID: 21174627 DOI: 10.2217/pgs.10.168] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
AIMS Multiple warfarin pharmacogenetic dosing algorithms have been reported to date. However, there is only limited information available on the performance of the algorithms that can be used with the results of a US FDA-cleared warfarin pharmacogenetic test. We compared the performance of warfarin pharmacogenetic dosing algorithms in a large racially diverse cohort. MATERIALS & METHODS Warfarin pharmacogenetic dosing algorithms were identified using the PubMed database. Patient information from the International Warfarin Pharmacogenetics Consortium database was used to predict therapeutic warfarin doses according to each algorithm. By using bootstrapping analysis, the performance of algorithms was tested by comparing the mean absolute error and mean percentage of patients whose predicted dose fell within 20% of actual dose (percentage within 20%) in the entire cohort, and by race and therapeutic dose range. RESULTS A total of 13 algorithms and 1940 patients were included in the study. Overall, all the algorithms had similar performances (mean absolute error: 10.3 mg/week and mean percentage within 20%-41.4%). However, algorithms derived from racially mixed populations tended to perform better than those derived from single race populations. Mixed population algorithms had the lowest mean absolute error and the highest percentage within 20% across the racial groups. Most algorithms performed better in the intermediate-dose range (between 21 and 49 mg/week) than in the low (≤21 mg/week) or high-(≥49 mg/week) range. CONCLUSION Published warfarin pharmacogenetic algorithms performed similarly, although mixed population algorithms tended to perform better than race-specific algorithms.
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Affiliation(s)
- Jaekyu Shin
- Department of Clinical Pharmacy, School of Pharmacy, 521 Parnassus Avenue, University of California, San Francisco, CA 94143-90622, USA.
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Mahajan P, Meyer KS, Wall GC, Price HJ. Clinical applications of pharmacogenomics guided warfarin dosing. Int J Clin Pharm 2011; 33:10-9. [PMID: 21365388 DOI: 10.1007/s11096-011-9486-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2010] [Accepted: 10/11/2010] [Indexed: 12/26/2022]
Abstract
AIM OF THE REVIEW To assess the state of the literature concerning pharmacogenomic testing in patients requiring vitamin K antagonists, specifically warfarin. METHOD We conducted a literature search of MEDLINE and International Pharmaceutical Abstracts using the following words: warfarin, pharmacogenetic, and pharmacogenomic. The search results were reviewed by the authors and papers concerning pharmacogenomic testing in warfarin dosing were procured and reviewed. Additionally bibliographies of papers procured were also examined for other studies. The authors focused on clinical trials concerning the use of pharmacogenomic testing in warfarin dosing. RESULTS Although numerous studies have demonstrated that a significant portion of warfarin dosing variability can be explained by genetic polymorphisms, few prospective studies have been conducted that examine the integration of this information in practical dosing situations. Those that have, have shown that using pharmacogenomic information improves initial dosing estimates and decreases the need for frequent clinic visits and laboratory testing. Data showing a reduction in serious bleeding events is sparse. Cost-effectiveness analyses have generally shown a small but positive effect with pharmacogenomic testing in patients receiving warfarin. CONCLUSION Several studies have shown that pharmacogenomic testing for warfarin dosing is more accurate that other dosing schemes. Pharmacogenomic testing improves time to a therapeutic international normalized ratio while requiring fewer dosing adjustments. Patients who require higher or lower than usual doses seem to benefit the most. The cost-effectiveness of pharmacogenomic testing as well as preventing of outcomes such as bleeding or thrombosis are not yet elucidated. Pharmacists, especially those in a community setting can play a role in this new technology by educating prescribers and patients concerning pharmacogenomic testing, and by developing and using dosing protocols that incorporate its use.
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Affiliation(s)
- Pramod Mahajan
- College of Pharmacy and Health Sciences, Drake University, 2507 University Ave, Des Moines, IA 50310, USA
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Mahajan P, Meyer KS, Wall GC, Price HJ. Clinical applications of pharmacogenomics guided warfarin dosing. Int J Clin Pharm 2010; 35:359-68. [DOI: 10.1007/s11096-010-9448-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2010] [Accepted: 10/11/2010] [Indexed: 12/28/2022]
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Factores genéticos y ambientales asociados con la respuesta a warfarina en pacientes colombianos. BIOMÉDICA 2010. [DOI: 10.7705/biomedica.v30i3.275] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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Current awareness: Pharmacoepidemiology and drug safety. Pharmacoepidemiol Drug Saf 2010. [DOI: 10.1002/pds.1850] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Kadafour M, Haugh R, Posin M, Kayser SR, Shin J. Survey on warfarin pharmacogenetic testing among anticoagulation providers. Pharmacogenomics 2010; 10:1853-60. [PMID: 19891559 DOI: 10.2217/pgs.09.117] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
AIMS Our study aimed to assess anticoagulation providers' perception and knowledge of warfarin pharmacogenetic testing, and to identify barriers to using it in their clinical practice. MATERIALS & METHODS An online survey that included 5 perception and 5 knowledge questions about the testing was conducted on anticoagulation providers in North America. Participants were also asked to rank the three most significant barriers to using it. RESULTS The survey response rate was 22%. Over 40% of 448 providers participating in the study were undecided about the testing's potential clinical benefits. On average, providers correctly answered 2 out of 5 knowledge questions. Self confidence in interpreting test results significantly predicted the providers' accuracy of the interpretation. The top three barriers were inadequate literature evidence, testing's impracticality and unproven applicability. CONCLUSION Most of the providers did not respond to the survey. Our study suggests inadequate literature evidence influences providers' perception and their use of the testing. In addition, provider education on warfarin pharmacogenetics may be necessary for testing's widespread use.
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Affiliation(s)
- Maha Kadafour
- Department of Clinical Pharmacy, School of Pharmacy, University of California, San Francisco, CA 94143-0622, USA
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Takeuchi F, Kashida M, Okazaki O, Tanaka Y, Fukuda S, Kashima T, Hosaka S, Hiroe M, Kimura S, Kato N. Evaluation of Pharmacogenetic Algorithm for Warfarin Dose Requirements in Japanese Patients. Circ J 2010; 74:977-82. [DOI: 10.1253/circj.cj-09-0876] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Fumihiko Takeuchi
- Department of Gene Diagnostics and Therapeutics, Research Institute, International Medical Center of Japan
| | - Mitsuo Kashida
- Division of Cardiology, International Medical Center of Japan
| | - Osamu Okazaki
- Division of Cardiology, International Medical Center of Japan
| | - Yuriko Tanaka
- Division of Cardiology, International Medical Center of Japan
| | - Shoji Fukuda
- Division of Cardiovascular Surgery, International Medical Center of Japan
| | - Toshitaka Kashima
- Division of Cardiovascular Surgery, International Medical Center of Japan
| | - Shigeru Hosaka
- Division of Cardiovascular Surgery, International Medical Center of Japan
| | - Michiaki Hiroe
- Division of Cardiology, International Medical Center of Japan
| | - Sosuke Kimura
- Division of Cardiovascular Surgery, International Medical Center of Japan
- Toyama Hospital, International Medical Center of Japan
| | - Norihiro Kato
- Department of Gene Diagnostics and Therapeutics, Research Institute, International Medical Center of Japan
- Division of Cardiology, International Medical Center of Japan
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