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Xue L, Singla RK, He S, Arrasate S, González-Díaz H, Miao L, Shen B. Warfarin-A natural anticoagulant: A review of research trends for precision medication. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2024; 128:155479. [PMID: 38493714 DOI: 10.1016/j.phymed.2024.155479] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2023] [Revised: 01/29/2024] [Accepted: 02/22/2024] [Indexed: 03/19/2024]
Abstract
BACKGROUND Warfarin is a widely prescribed anticoagulant in the clinic. It has a more considerable individual variability, and many factors affect its variability. Mathematical models can quantify the quantitative impact of these factors on individual variability. PURPOSE The aim is to comprehensively analyze the advanced warfarin dosing algorithm based on pharmacometrics and machine learning models of personalized warfarin dosage. METHODS A bibliometric analysis of the literature retrieved from PubMed and Scopus was performed using VOSviewer. The relevant literature that reported the precise dosage of warfarin calculation was retrieved from the database. The multiple linear regression (MLR) algorithm was excluded because a recent systematic review that mainly reviewed this algorithm has been reported. The following terms of quantitative systems pharmacology, mechanistic model, physiologically based pharmacokinetic model, artificial intelligence, machine learning, pharmacokinetic, pharmacodynamic, pharmacokinetics, pharmacodynamics, and warfarin were added as MeSH Terms or appearing in Title/Abstract into query box of PubMed, then humans and English as filter were added to retrieve the literature. RESULTS Bibliometric analysis revealed important co-occuring MeShH and index keywords. Further, the United States, China, and the United Kingdom were among the top countries contributing in this domain. Some studies have established personalized warfarin dosage models using pharmacometrics and machine learning-based algorithms. There were 54 related studies, including 14 pharmacometric models, 31 artificial intelligence models, and 9 model evaluations. Each model has its advantages and disadvantages. The pharmacometric model contains biological or pharmacological mechanisms in structure. The process of pharmacometric model development is very time- and labor-intensive. Machine learning is a purely data-driven approach; its parameters are more mathematical and have less biological interpretation. However, it is faster, more efficient, and less time-consuming. Most published models of machine learning algorithms were established based on cross-sectional data sourced from the database. CONCLUSION Future research on personalized warfarin medication should focus on combining the advantages of machine learning and pharmacometrics algorithms to establish a more robust warfarin dosage algorithm. Randomized controlled trials should be performed to evaluate the established algorithm of warfarin dosage. Moreover, a more user-friendly and accessible warfarin precision medicine platform should be developed.
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Affiliation(s)
- Ling Xue
- Joint Laboratory of Artificial Intelligence for Critical Care Medicine, Department of Critical Care Medicine and Institutes for Systems Genetics, Frontiers Science Center for Disease-related Molecular Network, West China Hospital, Sichuan University, Chengdu, China; Department of Pharmacy, The First Affiliated Hospital of Soochow University, Suzhou, China; Department of Pharmacology, Faculty of Medicine, University of The Basque Country (UPV/EHU), Bilbao, Basque Country, Spain
| | - Rajeev K Singla
- Joint Laboratory of Artificial Intelligence for Critical Care Medicine, Department of Critical Care Medicine and Institutes for Systems Genetics, Frontiers Science Center for Disease-related Molecular Network, West China Hospital, Sichuan University, Chengdu, China; School of Pharmaceutical Sciences, Lovely Professional University, Phagwara, Punjab-144411, India
| | - Shan He
- IKERDATA S.l., ZITEK, University of The Basque Country (UPVEHU), Rectorate Building, 48940, Bilbao, Basque Country, Spain; Department of Organic and Inorganic Chemistry, Faculty of Science and Technology, University of The Basque Country (UPV/EHU), P.O. Box 644, 48080, Bilbao, Basque Country, Spain
| | - Sonia Arrasate
- Department of Organic and Inorganic Chemistry, Faculty of Science and Technology, University of The Basque Country (UPV/EHU), P.O. Box 644, 48080, Bilbao, Basque Country, Spain
| | - Humberto González-Díaz
- Department of Organic and Inorganic Chemistry, Faculty of Science and Technology, University of The Basque Country (UPV/EHU), P.O. Box 644, 48080, Bilbao, Basque Country, Spain; BIOFISIKA: Basque Center for Biophysics CSIC, University of The Basque Country (UPV/EHU), Barrio Sarriena s/n, Leioa, Bizkaia 48940, Basque Country, Spain; IKERBASQUE, Basque Foundation for Science, 48011, Bilbao, Basque Country, Spain
| | - Liyan Miao
- Department of Pharmacy, The First Affiliated Hospital of Soochow University, Suzhou, China; Institute for Interdisciplinary Drug Research and Translational Sciences, Soochow University, Suzhou, China; College of Pharmaceutical Sciences, Soochow University, Suzhou, China.
| | - Bairong Shen
- Joint Laboratory of Artificial Intelligence for Critical Care Medicine, Department of Critical Care Medicine and Institutes for Systems Genetics, Frontiers Science Center for Disease-related Molecular Network, West China Hospital, Sichuan University, Chengdu, China.
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Kengkla K, Nathisuwan S, Sripakdee W, Saelue P, Sengnoo K, Sookprasert A, Subongkot S. Trends in Anticoagulant Utilization and Clinical Outcomes for Cancer-Associated Thrombosis: A Multicenter Cohort Study in Thailand's Upper-Middle-Income Country Setting. JCO Glob Oncol 2024; 10:e2300353. [PMID: 38422463 PMCID: PMC10914243 DOI: 10.1200/go.23.00353] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2023] [Revised: 01/02/2024] [Accepted: 01/17/2024] [Indexed: 03/02/2024] Open
Abstract
PURPOSE To evaluate anticoagulant trends and clinical outcomes in the management of cancer-associated thrombosis (CAT) within Thailand, an upper-middle-income country (UMIC). METHODS This multicenter retrospective cohort study included adult patients with cancer diagnosed with venous thromboembolism (VTE) hospitalized in Thailand from 2017 to 2021. Anticoagulants were classified as low-molecular-weight heparin (LMWH), direct oral anticoagulants (DOACs), and warfarin. Prescription trends were assessed, and patients were followed for 1 year, or until 2022 to evaluate outcomes. The primary effectiveness outcome was recurrent VTE, whereas the primary safety outcome was major bleeding. Secondary outcomes included net clinical benefit and all-cause mortality. Treatment effects were examined using inverse probability of treatment weighting (IPTW) Cox proportional hazards models. RESULTS Among 1,611 patients (61.3% female; mean age, 58.8 years; standard deviation, 13.1 years), 86% received LMWH, 10% warfarin, and 4% DOACs. In the study cohort, LMWH prescriptions remained consistent, warfarin use declined, and DOAC prescriptions notably increased. In IPTW analysis, DOACs showed comparable rates of VTE recurrence (weighted hazard ratio [HR], 0.77 [95% CI, 0.22 to 2.70]; P = .679) and major bleeding (weighted HR, 0.62 [95% CI, 0.15 to 2.55]; P = .506) with LMWH. Warfarin had a higher risk of major bleeding (weighted HR, 2.74 [95% CI, 1.12 to 6.72]; P = .028) but a similar rate of VTE recurrence (weighted HR, 1.46 [95% CI, 0.75 to 2.84]; P = .271) compared with LMWH. Secondary outcomes were consistent across groups. CONCLUSION LMWH remains the primary treatment for CAT, in line with current guidelines. The study highlights the challenges faced in these settings with the continuous use of warfarin. The comparable efficacy and safety of DOACs with LMWH suggest a potential shift in CAT management within UMICs.
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Affiliation(s)
- Kirati Kengkla
- Division of Clinical Pharmacy, Faculty of Pharmaceutical Sciences, Khon Kaen University, Khon Kaen, Thailand
- The College of Pharmacotherapy of Thailand, Nonthaburi, Thailand
- Division of Pharmacy Practice, Department of Pharmaceutical Care, School of Pharmaceutical Sciences, University of Phayao, Phayao, Thailand
| | - Surakit Nathisuwan
- Clinical Pharmacy Division, Department of Pharmacy, Faculty of Pharmacy, Mahidol University, Bangkok, Thailand
| | - Warunsuda Sripakdee
- Department of Clinical Pharmacy, Faculty of Pharmaceutical Sciences, Prince of Songkla University, Songkhla, Thailand
| | - Pirun Saelue
- Hematology Unit, Division of Internal Medicine, Faculty of Medicine, Prince of Songkla University, Songkhla, Thailand
| | | | - Aumkhae Sookprasert
- Medical Oncology Unit, Department of Medicine, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand
| | - Suphat Subongkot
- Division of Clinical Pharmacy, Faculty of Pharmaceutical Sciences, Khon Kaen University, Khon Kaen, Thailand
- The College of Pharmacotherapy of Thailand, Nonthaburi, Thailand
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Anand A, Kumar R, Sharma S, Gupta A, Vijayvergiya R, Mehrotra S, Kumar B, Lad D, Patil AN, Shafiq N, Malhotra S. Development and validation wise assessment of genotype guided warfarin dosing algorithm in Indian population. Drug Metab Pers Ther 2023; 38:273-279. [PMID: 37075481 DOI: 10.1515/dmpt-2022-0189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Accepted: 01/13/2023] [Indexed: 04/21/2023]
Abstract
OBJECTIVES A study was conducted to develop and validate the warfarin pharmacogenetic dose optimization algorithm considering the clinical pharmacogenetic implementation consortium (CPIC) recommendations for the Asian ethnicity population. METHODS The present prospective observational study recruited warfarin-receiving patients. We collected a three ml blood sample for VKORC1, CYP2C9*2, CYP2C9*3, and CYP4F2 polymorphism assessment during the follow-up visits. Clinical history, sociodemographic and warfarin dose details were noted. RESULTS The study recruited 300 patients (250 in derivation and 50 in validation timed cohort) receiving warfarin therapy. The baseline characteristics were similar in both cohorts. BMI, presence of comorbidity, VKORC1, CYP2C9*2, and CYP2C9*3 were identified as covariates significantly affecting the warfarin weekly maintenance dose (p<0.001 for all) and the same were included in warfarin pharmacogenetic dose optimization algorithm building. The algorithm built-in the present study showed a good correlation with Gage (r=0.57, p<0.0001), and IWPC (r=0.51, p<0.0001) algorithms, widely accepted in western side of the globe. The receiver operating characteristic curve analysis showed a sensitivity of 73 %, a positive predictive value of 96 %, and a specificity of 89 %. The algorithm correctly identified the validation cohort's warfarin-sensitive, intermediate reacting, and resistant patient populations. CONCLUSIONS Validation and comparisons of the warfarin pharmacogenetic dose optimization algorithm have made it ready for the clinical trial assessment.
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Affiliation(s)
- Aishwarya Anand
- Department of Pharmacology, Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, India
| | - Rupesh Kumar
- Department of Cardiothoracic and Vascular Surgery, Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, India
| | - Swati Sharma
- Department of Experimental Medicine and Biotechnology, Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, India
| | - Ankur Gupta
- Department of Cardiology, Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, India
| | - Rajesh Vijayvergiya
- Department of Cardiology, Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, India
| | - Saurabh Mehrotra
- Department of Cardiology, Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, India
| | - Basant Kumar
- Department of Cardiology, Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, India
| | - Deepesh Lad
- Department of Clinical Hematology, Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, India
| | - Amol N Patil
- Department of Pharmacology, Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, India
| | - Nusrat Shafiq
- Department of Pharmacology, Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, India
| | - Samir Malhotra
- Department of Pharmacology, Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, India
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Liu ZG, Yang F, Zhu YH, Liu GC, Zhu QS, Zhang BY. Is Tranexamic Acid Beneficial in Open Spine Surgery? and its Effects Vary by Dosage, Age, Sites, and Locations: A Meta-Analysis of Randomized Controlled Trials. World Neurosurg 2022; 166:141-152. [PMID: 35843575 DOI: 10.1016/j.wneu.2022.07.044] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2022] [Revised: 07/08/2022] [Accepted: 07/09/2022] [Indexed: 12/15/2022]
Abstract
BACKGROUND The role of tranexamic acid (TXA) in controlling blood loss during spine surgery remains unclear. With the publication of new randomized controlled trials (RCTs), we conducted a meta-analysis to determine the safety and efficacy of TXA in spine surgery. METHODS PubMed, Embase, Web of Science, and Cochrane databases were searched for relevant studies through 2022. Only RCTs were eligible for this study. The extracted data were analyzed using RevMan 5.3 software for meta-analysis. RESULTS Twenty RCTs including 1497 patients undergoing spine surgery were included in this systematic evaluation. Compared with the control group, TXA significantly reduced total blood loss (mean difference [MD] = - 218.96, 95% confidence interval [CI] = - 309.77 to - 128.14, P < 0.00001), perioperative blood loss (MD = - 90.54, 95% CI = - 139.33 to - 41.75, P = 0.0003), postoperative drainage (MD = - 102.60, 95% CI = - 139.51 to - 65.70, P < 0.00001),reduced hospital stay (MD = - 1.42, 95% CI = - 2.71 to - 0.14, P = 0.03), reduced total blood transfusion volume (MD = - 551.06, 95% CI = - 755.90 to - 346.22, P < 0.00001), and international normalized ratio (MD = -0.03, 95% CI = -0.04 to -0.02, P < 0.00001). CONCLUSIONS Based on the meta-analysis of 20 RCTs, we demonstrated that TXA reduces blood loss in open spine surgery, decreases transfusion rates, and shortens hospital stays. The TXA administration during the perioperative period does not increase the incidence of postoperative complications.
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Affiliation(s)
- Zhen-Gang Liu
- Department of Orthopaedics, China-Japan Union Hospital of Jilin University, Changchun, China
| | - Fan Yang
- Department of Orthopaedics, China-Japan Union Hospital of Jilin University, Changchun, China
| | - Yu-Hang Zhu
- Department of Orthopaedics, China-Japan Union Hospital of Jilin University, Changchun, China
| | - Guang-Chen Liu
- Department of Orthopaedics, China-Japan Union Hospital of Jilin University, Changchun, China
| | - Qing-San Zhu
- Department of Orthopaedics, China-Japan Union Hospital of Jilin University, Changchun, China
| | - Bo-Yin Zhang
- Department of Orthopaedics, China-Japan Union Hospital of Jilin University, Changchun, China.
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Poor Time in Therapeutic Range Control is Associated with Adverse Clinical Outcomes in Patients with Non-Valvular Atrial Fibrillation: A Report from the Nationwide COOL-AF Registry. J Clin Med 2020; 9:jcm9061698. [PMID: 32498302 PMCID: PMC7355466 DOI: 10.3390/jcm9061698] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Revised: 05/22/2020] [Accepted: 05/26/2020] [Indexed: 11/16/2022] Open
Abstract
BACKGROUND Warfarin remains the most commonly used oral anticoagulant (OAC) in Thailand for stroke prevention among patients with non-valvular atrial fibrillation (NVAF). The aim of this study was to investigate the relationship between time in therapeutic range (TTR) after warfarin initiation and clinical outcomes of NVAF. METHODS TTR was calculated by the Rosendaal method from international normalized ratio (INR) data acquired from a nationwide NVAF registry in Thailand. Patients were followed-up every six months. The association between TTR and clinical outcomes was analyzed. RESULTS There was a total of 2233 patients from 27 hospitals. The average age was 68.4 ± 10.6 years. The average TTR was 53.56 ± 26.37%. Rates of ischemic stroke/TIA, major bleeding, ICH, and death were 1.33, 2.48, 0.76, and 3.3 per 100 person-years, respectively. When patients with a TTR < 65% were compared with those with TTR ≥ 65%, the adjusted hazard ratios (aHR) for the increased risks of ischemic stroke/TIA, major bleeding, ICH, and death were 3.07, 1.90, 2.34, and 2.11, respectively. CONCLUSION Poor TTR control is associated with adverse clinical outcomes in patients with NVAF who were on warfarin. Efforts to ensure good TTR (≥65%) after initiation of warfarin are mandatory to minimize the risk of adverse clinical outcomes.
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Krittayaphong R, Winijkul A, Pirapatdit A, Chiewvit P, Komoltri C, Boonyapisit W, Arunsiriwattana S, Bunyapipat T, Apiyasawat S, Rattanasumawong K, Yindeengam A. SAMe-TT2R2 score for prediction of suboptimal time in therapeutic range in a Thai population with atrial fibrillation. Singapore Med J 2019; 61:641-646. [PMID: 31680175 DOI: 10.11622/smedj.2019143] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
INTRODUCTION International normalised ratio (INR) control is an important factor in patients with non-valvular atrial fibrillation (NVAF) being treated with warfarin. INR control was previously reported to be poorer among Asians compared to Westerners. We aimed to validate the SAMe-TT2R2 score for prediction of suboptimal INR control (defined as time in therapeutic range [TTR] < 65% in the Thai population) and to investigate TTR among Thai NVAF patients being treated with warfarin. METHODS INR data from patients enrolled in a multicentre NVAF registry was analysed. Clinical and laboratory data was prospectively collected. TTR was calculated using the Rosendaal method. Baseline data was compared between patients with and without suboptimal INR control. Univariate and multivariate analyses were performed to identify variables independently associated with suboptimal INR control. RESULTS A total of 1,669 patients from 22 centres located across Thailand were included. The average age was 69.1 ± 10.7 years, and 921 (55.2%) were male. The mean TTR was 50.5% ± 27.5%; 1,125 (67.4%) had TTR < 65%. Univariate analysis showed hypertension, diabetes mellitus, heart failure, renal disease and SAMe-TT2R2 score to be significantly different between patients with and without optimal TTR. The SAMe-TT2R2 score was the only factor that remained statistically significant in multivariate analysis. The C-statistic for the SAMe-TT2R2 score in the prediction of suboptimal TTR was 0.54. CONCLUSION SAMe-TT2R2 score was the only independent predictor of suboptimal TTR in NVAF patients being treated with warfarin. However, due to the low C-statistic, the score may have limited discriminative power.
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Affiliation(s)
- Rungroj Krittayaphong
- Division of Cardiology, Department of Medicine, Faculty of Medicine, Siriraj Hospital, Mahidol University, Bangkok, Thailand
| | - Arjbordin Winijkul
- Division of Cardiology, Department of Medicine, Faculty of Medicine, Siriraj Hospital, Mahidol University, Bangkok, Thailand
| | - Atthasit Pirapatdit
- Division of Cardiology, Department of Medicine, Faculty of Medicine, Siriraj Hospital, Mahidol University, Bangkok, Thailand
| | - Pollakrit Chiewvit
- Division of Cardiology, Department of Medicine, Faculty of Medicine, Siriraj Hospital, Mahidol University, Bangkok, Thailand
| | - Chulalak Komoltri
- Department of Research Promotion, Faculty of Medicine, Siriraj Hospital, Mahidol University, Bangkok, Thailand
| | - Warangkna Boonyapisit
- Division of Cardiology, Department of Medicine, Faculty of Medicine, Siriraj Hospital, Mahidol University, Bangkok, Thailand
| | | | | | - Sirin Apiyasawat
- Faculty of Medicine, Ramathibodi Hospital, Mahidol University, Bangkok, Thailand
| | | | - Ahthit Yindeengam
- Division of Cardiology, Department of Medicine, Faculty of Medicine, Siriraj Hospital, Mahidol University, Bangkok, Thailand
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Ooi QX, Wright DFB, Tait RC, Isbister GK, Duffull SB. A Joint Model for Vitamin K-Dependent Clotting Factors and Anticoagulation Proteins. Clin Pharmacokinet 2018; 56:1555-1566. [PMID: 28409488 DOI: 10.1007/s40262-017-0541-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
BACKGROUND Warfarin acts by inhibiting the reduction of vitamin K (VK) to its active form, thereby decreasing the production of VK-dependent coagulation proteins. The aim of this research is to develop a joint model for the VK-dependent clotting factors II, VII, IX and X, and the anticoagulation proteins, proteins C and S, during warfarin initiation. METHODS Data from 18 patients with atrial fibrillation who had warfarin therapy initiated were available for analysis. Nine blood samples were collected from each subject at baseline, and at 1-5, 8, 15 and 29 days after warfarin initiation and assayed for factors II, VII, IX and X, and proteins C and S. Warfarin concentration-time data were not available. The coagulation proteins data were modelled in a stepwise manner using NONMEM® Version 7.2. In the first stage, each of the coagulation proteins was modelled independently using a kinetic-pharmacodynamic model. In the subsequent step, the six kinetic-pharmacodynamic models were combined into a single joint model. RESULTS One patient was administered VK and was excluded from the analysis. Each kinetic-pharmacodynamic model consisted of two parts: (1) a common one-compartment pharmacokinetic model with first-order absorption and elimination for warfarin; and (2) an inhibitory E max model linked to a turnover model for coagulation proteins. In the joint model, an unexpected pharmacodynamic lag was identified and the estimated degradation half-life of VK-dependent coagulation proteins were in agreement with previously published values. The model provided an adequate fit to the observed data. CONCLUSION The joint model represents the first work to quantify the influence of warfarin on all six VK-dependent coagulation proteins simultaneously. Future work will expand the model to predict the influence of exogenously administered VK on the time course of clotting factor concentrations after warfarin overdose and during perioperative warfarin reversal procedures.
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Affiliation(s)
- Qing Xi Ooi
- School of Pharmacy, University of Otago, PO Box 56, Dunedin, 9054, New Zealand.
| | - Daniel F B Wright
- School of Pharmacy, University of Otago, PO Box 56, Dunedin, 9054, New Zealand
| | | | - Geoffrey K Isbister
- School of Medicine and Public Health, University of Newcastle, Newcastle, NSW, Australia
| | - Stephen B Duffull
- School of Pharmacy, University of Otago, PO Box 56, Dunedin, 9054, New Zealand
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Effectiveness and Safety of Different Rivaroxaban Dosage Regimens in Patients with Non-Valvular Atrial Fibrillation: A Nationwide, Population-Based Cohort Study. Sci Rep 2018; 8:3451. [PMID: 29472623 PMCID: PMC5823875 DOI: 10.1038/s41598-018-21884-y] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2017] [Accepted: 02/12/2018] [Indexed: 12/12/2022] Open
Abstract
The objective of this study is to evaluate the effectiveness of different rivaroxaban dosage regimens in preventing ischemic stroke and systemic thromboembolism among Asians. A retrospective cohort study was conducted on data from nationwide insurance claims in Taiwan. Patients with non-valvular atrial fibrillation under warfarin or rivaroxaban therapy were included. Propensity score matching was used to balance the covariates, and Cox-proportional hazard models were applied to compare the effectiveness and safety of each treatment group. Rivaroxaban was associated with a significantly lower risk of venous thromboembolism (hazard ratio [HR]: 0.51; 95% confidence interval [CI]: 0.29–0.92, P = 0.02) and intracranial hemorrhage (HR: 0.48; 95% CI: 0.32–0.72, P < 0.001) than warfarin. Rivaroxaban 20 mg and 15 mg were associated with a significantly lower risk of ischemic stroke (20 mg, HR: 0.48; CI: 0.29–0.80, P = 0.005; 15 mg, HR: 0.69; CI: 0.53–0.90, P = 0.005), but rivaroxaban 10 mg was not. In the subgroup analysis of patients older than 65 years, the results were generally the same, except that rivaroxaban had a significantly lower risk of ischemic stroke than warfarin.
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Lv C, Liu C, Yao Z, Gao X, Sun L, Liu J, Song H, Li Z, Du X, Sun J, Li Y, Ye K, Wang R, Huang Y. The Clinical Pharmacokinetics and Pharmacodynamics of Warfarin When Combined with Compound Danshen: A Case Study for Combined Treatment of Coronary Heart Diseases with Atrial Fibrillation. Front Pharmacol 2017; 8:826. [PMID: 29209208 PMCID: PMC5702344 DOI: 10.3389/fphar.2017.00826] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2017] [Accepted: 10/31/2017] [Indexed: 12/11/2022] Open
Abstract
Warfarin is used as anticoagulant and Compound Danshen prescription (CDP) is able to promote blood circulation. The combination might produce a synergic effect for patients of coronary heart diseases (CHDs) with atrial fibrillation (AF). Whether the combination increases the bleeding risk of warfarin is unclear, so the effects of Compound Danshen dripping pill (CDDP) on the pharmacokinetics (PK) and pharmacodynamics (PD) profiles of warfarin was investigated in patients. The dose and blood concentrations of warfarin, the four indicators of blood coagulation, prothrombin time, activated partial thromboplatin time, thrombin time, fibrinogen, and international normalized ratio value were compared when with and without CDDP treatment. The population PK (PPK) and PPK-PD models were established to assess patient demographics, genetic polymorphisms and CDDP as covariates. And the Seattle Angina Questionnaire was used to evaluate clinical efficacy, and the bleeding risk of combination was analyzed. The results indicated that CDDP had little influence on PK and PD profiles of warfarin in most patients and the combination of CCDP and warfarin would be a promising alternative regime for CHD with AF patients. The study was registered on China Clinical Trial Registry with number ChiCTR-ONRC-13003523.
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Affiliation(s)
- Chunxiao Lv
- Department of Clinical Pharmacology, Second Affiliated Hospital of Tianjin University of Traditional Chinese Medicine, Tianjin, China
| | - Changxiao Liu
- State Key Laboratory of Drug Delivery Technology and Pharmacokinetics, Tianjin Institute of Pharmaceutical Research, Tianjin, China
| | - Zhuhua Yao
- Department of Cardiology, People's Hospital of Tianjin, Tianjin, China
| | - Xiumei Gao
- Engineering Research Center of Modern Chinese Medicine Discovery and Preparation Technique, Tianjin University of Traditional Chinese Medicine, Tianjin, China
| | - Lanjun Sun
- Department of Cardiology, Second Affiliated Hospital of Tianjin University of Traditional Chinese Medicine, Tianjin, China
| | - Jia Liu
- Department of Clinical Pharmacology, Second Affiliated Hospital of Tianjin University of Traditional Chinese Medicine, Tianjin, China
| | - Haibo Song
- National Center for ADR Monitoring of China, Center for Drug Reevaluation of CFDA, Beijing, China
| | - Ziqiang Li
- Department of Clinical Pharmacology, Second Affiliated Hospital of Tianjin University of Traditional Chinese Medicine, Tianjin, China
| | - Xi Du
- Department of Clinical Pharmacology, Second Affiliated Hospital of Tianjin University of Traditional Chinese Medicine, Tianjin, China
| | - Jinxia Sun
- Department of Clinical Pharmacology, Second Affiliated Hospital of Tianjin University of Traditional Chinese Medicine, Tianjin, China
| | - Yanfen Li
- Department of Clinical Pharmacology, Second Affiliated Hospital of Tianjin University of Traditional Chinese Medicine, Tianjin, China
| | - Kui Ye
- Department of Vascular Surgery, Tianjin 4th Center Hospital, Tianjin, China
| | - Ruihua Wang
- Department of Clinical Pharmacology, Second Affiliated Hospital of Tianjin University of Traditional Chinese Medicine, Tianjin, China
| | - Yuhong Huang
- Department of Clinical Pharmacology, Second Affiliated Hospital of Tianjin University of Traditional Chinese Medicine, Tianjin, China
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Shah R, Patel MR. Primary and key secondary results from the ROCKET AF trial, and their implications on clinical practice. Ther Adv Cardiovasc Dis 2017; 11:105-120. [PMID: 27555569 PMCID: PMC5942797 DOI: 10.1177/1753944716663156] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND The safety and efficacy of the oral anticoagulant rivaroxaban were studied in the Rivaroxaban Once Daily Oral Direct Factor Xa Inhibition Compared with Vitamin K Antagonism for Prevention of Stroke and Embolism Trial in Atrial Fibrillation (ROCKET AF trial). A number of subanalyses of the ROCKET AF trial have subsequently analyzed the use of rivaroxaban in special patient populations. METHODS The outcomes of the ROCKET AF trial were reviewed. The use of rivaroxaban in higher risk populations, as determined by the presence of co-morbidities included in the CHADS2 criteria, was analyzed. Requirements for dose adjustment in patients with renal impairment and in East Asian patients were described. Finally, clinical management challenges, including interruptions in therapy, drug discontinuation, management of bleeding events, drug interactions, and management of patients requiring cardioversion/ablation were reviewed. RESULTS Rivaroxaban is efficacious in high-risk populations, including elderly patients, patients with diabetes, heart failure, history of stroke, prior myocardial infarction, or peripheral arterial disease (PAD). Patients with PAD have a higher risk of bleeding with rivaroxaban compared with warfarin. East Asian populations do not require a dose adjustment for rivaroxaban, while a reduced dose of 15 mg daily is required for patients with moderate renal impairment. Rivaroxaban remains effective with temporary interruptions in therapy and in patients requiring cardioversion/ablation. Rates of major bleeding and subsequent outcomes were similar in patients on warfarin and rivaroxaban, although rates of gastrointestinal bleeding were higher with rivaroxaban. Concurrent use of antiarrhythmic therapy was not associated with adverse outcomes. CONCLUSIONS Rivaroxaban represents an efficacious alternative to warfarin in high-risk patients with AF. Dose adjustment is required for patients with moderate renal impairment. Rivaroxaban can be used safely in a number of challenging clinical management scenarios although the concurrent use of amiodarone requires more study.
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Affiliation(s)
- Rohan Shah
- Duke Clinical Research Institute, Durham, NC, USA
| | - Manesh R. Patel
- Duke Clinical Research Institute, Division of Cardiology, Department of Medicine, Duke University Medical Center, PO Box 17969, 2400 Pratt St, Durham, NC 27715, USA
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11
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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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12
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Xue L, Holford N, Ding XL, Shen ZY, Huang CR, Zhang H, Zhang JJ, Guo ZN, Xie C, Zhou L, Chen ZY, Liu LS, Miao LY. Theory-based pharmacokinetics and pharmacodynamics of S- and R-warfarin and effects on international normalized ratio: influence of body size, composition and genotype in cardiac surgery patients. Br J Clin Pharmacol 2016; 83:823-835. [PMID: 27763679 DOI: 10.1111/bcp.13157] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2016] [Revised: 10/09/2016] [Accepted: 10/15/2016] [Indexed: 11/30/2022] Open
Abstract
AIMS The aims of this study are to apply a theory-based mechanistic model to describe the pharmacokinetics (PK) and pharmacodynamics (PD) of S- and R-warfarin. METHODS Clinical data were obtained from 264 patients. Total concentrations for S- and R-warfarin were measured by ultra-high performance liquid tandem mass spectrometry. Genotypes were measured using pyrosequencing. A sequential population PK parameter with data method was used to describe the international normalized ratio (INR) time course. Data were analyzed with NONMEM. Model evaluation was based on parameter plausibility and prediction-corrected visual predictive checks. RESULTS Warfarin PK was described using a one-compartment model. CYP2C9 *1/*3 genotype had reduced clearance for S-warfarin, but increased clearance for R-warfarin. The in vitro parameters for the relationship between prothrombin complex activity (PCA) and INR were markedly different (A = 0.560, B = 0.386) from the theory-based values (A = 1, B = 0). There was a small difference between healthy subjects and patients. A sigmoid Emax PD model inhibiting PCA synthesis as a function of S-warfarin concentration predicted INR. Small R-warfarin effects was described by competitive antagonism of S-warfarin inhibition. Patients with VKORC1 AA and CYP4F2 CC or CT genotypes had lower C50 for S-warfarin. CONCLUSION A theory-based PKPD model describes warfarin concentrations and clinical response. Expected PK and PD genotype effects were confirmed. The role of predicted fat free mass with theory-based allometric scaling of PK parameters was identified. R-warfarin had a minor effect compared with S-warfarin on PCA synthesis. INR is predictable from 1/PCA in vivo.
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Affiliation(s)
- Ling Xue
- Department of Clinical Pharmacology, the First Affiliated Hospital of Soochow University, Suzhou, 215006, China
| | - Nick Holford
- Department of Pharmacology and Clinical Pharmacology, University of Auckland, New Zealand
| | - Xiao-Liang Ding
- Department of Clinical Pharmacology, the First Affiliated Hospital of Soochow University, Suzhou, 215006, China
| | - Zhen-Ya Shen
- Department of Cardiovascular Surgery, the First Affiliated Hospital of Soochow University, Suzhou, 215006, China
| | - Chen-Rong Huang
- Department of Clinical Pharmacology, the First Affiliated Hospital of Soochow University, Suzhou, 215006, China
| | - Hua Zhang
- Department of Clinical Pharmacology, the First Affiliated Hospital of Soochow University, Suzhou, 215006, China
| | - Jing-Jing Zhang
- Department of Clinical Pharmacology, the First Affiliated Hospital of Soochow University, Suzhou, 215006, China
| | - Zhe-Ning Guo
- College of Pharmaceutical Sciences, Soochow University, Suzhou, 215123, China
| | - Cheng Xie
- Department of Clinical Pharmacology, the First Affiliated Hospital of Soochow University, Suzhou, 215006, China
| | - Ling Zhou
- Department of Clinical Pharmacology, the First Affiliated Hospital of Soochow University, Suzhou, 215006, China
| | - Zhi-Yao Chen
- Department of Clinical Pharmacology, the First Affiliated Hospital of Soochow University, Suzhou, 215006, China
| | - Lin-Sheng Liu
- Department of Clinical Pharmacology, the First Affiliated Hospital of Soochow University, Suzhou, 215006, China
| | - Li-Yan Miao
- Department of Clinical Pharmacology, the First Affiliated Hospital of Soochow University, Suzhou, 215006, China.,College of Pharmaceutical Sciences, Soochow University, Suzhou, 215123, China
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13
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Oh S, Goto S, Accetta G, Angchaisuksiri P, Camm AJ, Cools F, Haas S, Kayani G, Koretsune Y, Lim TW, Misselwitz F, van Eickels M, Kakkar AK. Vitamin K antagonist control in patients with atrial fibrillation in Asia compared with other regions of the world: Real-world data from the GARFIELD-AF registry. Int J Cardiol 2016; 223:543-547. [DOI: 10.1016/j.ijcard.2016.08.236] [Citation(s) in RCA: 62] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/25/2016] [Revised: 07/18/2016] [Accepted: 08/12/2016] [Indexed: 10/21/2022]
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14
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Hasunuma T, Tohkin M, Kaniwa N, Jang IJ, Yimin C, Kaneko M, Saito Y, Takeuchi M, Watanabe H, Yamazoe Y, Uyama Y, Kawai S. Absence of ethnic differences in the pharmacokinetics of moxifloxacin, simvastatin, and meloxicam among three East Asian populations and Caucasians. Br J Clin Pharmacol 2016; 81:1078-90. [PMID: 26774055 PMCID: PMC4876172 DOI: 10.1111/bcp.12884] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2014] [Revised: 12/29/2015] [Accepted: 01/12/2016] [Indexed: 12/20/2022] Open
Abstract
Aim To examine whether strict control of clinical trial conditions could reduce apparent differences of pharmacokinetic (PK) parameters among ethnic groups. Methods Open‐label, single dose PK studies of moxifloxacin, simvastatin and meloxicam were conducted in healthy male subjects from three East Asian populations (Japanese, Chinese and Koreans) and one Caucasian population as a control. These three drugs were selected because differences in PK parameters have been reported, even though the backgrounds of these East Asian populations are similar. Moxifloxacin (400 mg) was administered orally to 20 subjects, and plasma and urine levels of moxifloxacin and its metabolite (M2) were measured. Simvastatin (20 mg) was given to 40 subjects, and plasma levels of simvastatin and simvastatin acid were measured. Meloxicam (7.5 mg) was given to 30 subjects and its plasma concentration was determined. Intrinsic factors (polymorphism of UGT1A1 for moxifloxacin, SLCO1B1 for simvastatin, and CYP2C9 for meloxicam) were also examined. Results AUCinf values for moxifloxacin, simvastatin and meloxicam showed no significant differences among the East Asian groups. Cmax values of moxifloxacin and simvastatin, but not meloxicam, showed significant differences. There were no significant differences of data for M2 or simvastatin acid. Genetic analysis identified significant differences in the frequencies of relevant polymorphisms, but these differences did not affect the PK parameters observed. Conclusions Although there were some differences in PK parameters among the three East Asian groups, the present study performed under strictly controlled conditions did not reproduce the major ethnic differences observed in previous studies.
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Affiliation(s)
- Tomoko Hasunuma
- Division of Rheumatology, Department of Internal Medicine, Toho University School of Medicine, Tokyo, Japan.,Biomedical Research Center, Kitasato Institute Hospital, Kitasato University, Tokyo, Japan
| | - Masahiro Tohkin
- Department of Regulatory Science, Nagoya City University Graduate School of Pharmaceutical Sciences, Nagoya, Japan.,Division of Medicinal Safety Science, National Institute of Health Science, Tokyo, Japan
| | - Nahoko Kaniwa
- Division of Medicinal Safety Science, National Institute of Health Science, Tokyo, Japan
| | - In-Jin Jang
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, South Korea
| | - Cui Yimin
- Peking University First Hospital, Beijing, China
| | - Masaru Kaneko
- SNBL Clinical Pharmacology Center, Baltimore, Maryland, USA
| | - Yoshiro Saito
- Division of Medicinal Safety Science, National Institute of Health Science, Tokyo, Japan
| | - Masahiro Takeuchi
- Department of Clinical Medicine, School of Pharmacy, Kitasato University, Tokyo, Japan
| | - Hiroshi Watanabe
- Clinical Pharmacology and Therapeutics, Hamamatsu University School of Medicine, Hamamatsu, Japan
| | - Yasushi Yamazoe
- Tohoku University Graduate School of Pharmaceutical Sciences, Sendai, Japan
| | - Yoshiaki Uyama
- Analysis Division, Office of Safety I, Pharmaceuticals and Medical Devices Agency, Tokyo, Japan
| | - Shinichi Kawai
- Division of Rheumatology, Department of Internal Medicine, Toho University School of Medicine, Tokyo, Japan
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15
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Woods DL, Mentes JC, Cadogan M, Phillips LR. Aging, Genetic Variations, and Ethnopharmacology: Building Cultural Competence Through Awareness of Drug Responses in Ethnic Minority Elders. J Transcult Nurs 2015; 28:56-62. [PMID: 26400505 DOI: 10.1177/1043659615606202] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Unique drug responses that may result in adverse events are among the ethnocultural differences described by the Agency for Healthcare Research and Quality. These differences, often attributed to a lack of adherence on the part of the older adult, may be linked to genetic variations that influence drug responses in different ethnic groups. The paucity of research coupled with a lack of knowledge among health care providers compound the problem, contributing to further disparities, especially in this era of personalized medicine and pharmacogenomics. This article examines how age-related changes and genetic differences influence variations in drug responses among older adults in unique ethnocultural groups. The article starts with an overview of age-related changes and ethnopharmacology, moves to describing genetic differences that affect drug responses, with a focus on medications commonly prescribed for older adults, and ends with application of these issues to culturally congruent health care.
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16
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Lin YP, Tan TY. Do NOACs Improve Antithrombotic Therapy in Secondary Stroke Prevention in Nonvalvular Atrial Fibrillation? Medicine (Baltimore) 2015; 94:e1627. [PMID: 26402834 PMCID: PMC4635774 DOI: 10.1097/md.0000000000001627] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
Guidelines recommended oral anticoagulant (OAC) for ischemic stroke patients related to atrial fibrillation (AF). But, underprescription or underdose of warfarin was observed worldwide. We aimed to explore if the use of antithrombotic therapy in nonvalvular AF (NVAF) ischemic stroke patients improved after novel oral anticoagulants (NOACs) became available. Between January 2011 to December 2013, 360 acute ischemic stroke patients related to NVAF were recruited. Patients were categorized into 2 groups based on the date (July 2012) of NOACs' availability. There were 184 patients recruited before July 2012, and whereas 176 patients after July 2012. Demographic data, interested factors, and the percentage of patient on OAC were compared. One month after discharge, percentage of OAC utilization was significantly higher (29% versus 41%; P = 0.022) as well as effective anticoagulation (22.2% versus 80.6%; P < 0.001); warfarin utilization was significantly less (28.3% versus 11%; P < 0.001) after NOACs became available. Antiplatelet agent utilization was high in 2 groups (57% versus 52%; P = 0.36). Age (odd ratios [OR] 0.947; 95% confidence intervals [CI] 0.912-0.984; P = 0.005), Barthel index (OR 1.012; 95% CI 1.000-1.025; P = 0.05), and NOACs' availability (OR 1.857; 95% CI 1.086-3.175; P = 0.024) were the significant factors affecting the use of OAC. A higher percentage of NVAF ischemic stroke patients returning for their 1-month follow-up were treated with NOACs than with warfarin. The use of antithrombotic therapy improved after NOACs became available. But, the majority of the patients were still received antiplatelet agent for emboli stroke prevention.
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Affiliation(s)
- Yi-Pin Lin
- From the Division of Cerebrovascular Disease, Department of Neurology, Chang Gung Memorial Hospital, Kaohsiung (YPL, TYT); School of Medicine, Medical College, China Medical University, Taichung and Department of Neurology, Tainan Municipal An-Nan Hospital-China Medical University, Tainan (YPL), Taiwan
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Wong KSL, Hu DY, Oomman A, Tan RS, Patel MR, Singer DE, Breithardt G, Mahaffey KW, Becker RC, Califf R, Fox KAA, Berkowitz SD, Hacke W, Hankey GJ. Rivaroxaban for stroke prevention in East Asian patients from the ROCKET AF trial. Stroke 2014; 45:1739-47. [PMID: 24763930 DOI: 10.1161/strokeaha.113.002968] [Citation(s) in RCA: 126] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
BACKGROUND AND PURPOSE In Rivaroxaban Once Daily Oral Direct Factor Xa Inhibitor Compared With Vitamin K Antagonism for Prevention of Stroke and Embolism Trial in Atrial Fibrillation (ROCKET AF) trial, rivaroxaban was noninferior to dose-adjusted warfarin in preventing stroke or systemic embolism among patients with nonvalvular atrial fibrillation at moderate to high stroke risk. Because of differences in patient demographics, epidemiology, and stroke risk management in East Asia, outcomes and relative effects of rivaroxaban versus warfarin were assessed to determine consistency among East Asians versus other ROCKET AF participants. METHODS Baseline demographics and interaction of treatment effects of rivaroxaban and warfarin among patients within East Asia and outside were assessed. RESULTS A total of 932 (6.5%) ROCKET AF participants resided in East Asia. At baseline, East Asians had lower weight, creatinine clearance, and prior vitamin K antagonist use; higher prevalence of prior stroke; and less congestive heart failure and prior myocardial infarction than other participants. Despite higher absolute event rates for efficacy and safety outcomes in East Asians, the relative efficacy of rivaroxaban (20 mg once daily; 15 mg once daily for creatinine clearance of 30-49 mL/min) versus warfarin with respect to the primary efficacy end point (stroke/systemic embolism) was consistent among East Asians and non-East Asians (interaction P=0.666). Relative event rates for the major or nonmajor clinically relevant bleeding in patients treated with rivaroxaban and warfarin were consistent among East Asians and non-East Asians (interaction P=0.867). CONCLUSIONS Observed relative efficacy and safety of rivaroxaban versus warfarin were similar among patients within and outside East Asia. Rivaroxaban, 20 mg once daily, is an alternative to warfarin for stroke prevention in East Asians with nonvalvular atrial fibrillation.
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Affiliation(s)
- Ka Sing Lawrence Wong
- From the Department of Medicine and Therapeutics, Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong, China (K.S.L.W.); Heart Center, Peking University People's Hospital, Beijing, China (D.Y.H.); Department of Cardiology, Apollo Hospital, Chennai, India (A.O.); National Heart Centre, Singapore, Singapore (R.-S.T.); Department of Medicine, Division of Cardiology, Duke Clinical Research Institute (M.R.P., K.W.M., R.C.B.) and Department of Medicine, Division of Cardiology, Duke Translational Medicine Institute (R.C.), Duke University Medical Center, Durham, NC; Department of Epidemiology, Massachusetts General Hospital and Harvard Medical School, Boston (D.E.S.); Department of Cardiovascular Medicine, University Hospital Münster, Münster, Germany (G.B.); Centre for Cardiovascular Science, University of Edinburgh and Royal Infirmary of Edinburgh, Edinburgh, Scotland (K.A.A.F.); Bayer HealthCare Pharmaceuticals, Montville, NJ (S.D.B.); Department of Neurology, Ruprecht-Karls-University, Heidelberg, Germany (W.H.); and Stroke Unit, Department of Neurology, Royal Perth Hospital, University of Western Australia, Perth, Australia (G.J.H.).
| | - Dai Yi Hu
- From the Department of Medicine and Therapeutics, Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong, China (K.S.L.W.); Heart Center, Peking University People's Hospital, Beijing, China (D.Y.H.); Department of Cardiology, Apollo Hospital, Chennai, India (A.O.); National Heart Centre, Singapore, Singapore (R.-S.T.); Department of Medicine, Division of Cardiology, Duke Clinical Research Institute (M.R.P., K.W.M., R.C.B.) and Department of Medicine, Division of Cardiology, Duke Translational Medicine Institute (R.C.), Duke University Medical Center, Durham, NC; Department of Epidemiology, Massachusetts General Hospital and Harvard Medical School, Boston (D.E.S.); Department of Cardiovascular Medicine, University Hospital Münster, Münster, Germany (G.B.); Centre for Cardiovascular Science, University of Edinburgh and Royal Infirmary of Edinburgh, Edinburgh, Scotland (K.A.A.F.); Bayer HealthCare Pharmaceuticals, Montville, NJ (S.D.B.); Department of Neurology, Ruprecht-Karls-University, Heidelberg, Germany (W.H.); and Stroke Unit, Department of Neurology, Royal Perth Hospital, University of Western Australia, Perth, Australia (G.J.H.)
| | - Abraham Oomman
- From the Department of Medicine and Therapeutics, Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong, China (K.S.L.W.); Heart Center, Peking University People's Hospital, Beijing, China (D.Y.H.); Department of Cardiology, Apollo Hospital, Chennai, India (A.O.); National Heart Centre, Singapore, Singapore (R.-S.T.); Department of Medicine, Division of Cardiology, Duke Clinical Research Institute (M.R.P., K.W.M., R.C.B.) and Department of Medicine, Division of Cardiology, Duke Translational Medicine Institute (R.C.), Duke University Medical Center, Durham, NC; Department of Epidemiology, Massachusetts General Hospital and Harvard Medical School, Boston (D.E.S.); Department of Cardiovascular Medicine, University Hospital Münster, Münster, Germany (G.B.); Centre for Cardiovascular Science, University of Edinburgh and Royal Infirmary of Edinburgh, Edinburgh, Scotland (K.A.A.F.); Bayer HealthCare Pharmaceuticals, Montville, NJ (S.D.B.); Department of Neurology, Ruprecht-Karls-University, Heidelberg, Germany (W.H.); and Stroke Unit, Department of Neurology, Royal Perth Hospital, University of Western Australia, Perth, Australia (G.J.H.)
| | - Ru-San Tan
- From the Department of Medicine and Therapeutics, Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong, China (K.S.L.W.); Heart Center, Peking University People's Hospital, Beijing, China (D.Y.H.); Department of Cardiology, Apollo Hospital, Chennai, India (A.O.); National Heart Centre, Singapore, Singapore (R.-S.T.); Department of Medicine, Division of Cardiology, Duke Clinical Research Institute (M.R.P., K.W.M., R.C.B.) and Department of Medicine, Division of Cardiology, Duke Translational Medicine Institute (R.C.), Duke University Medical Center, Durham, NC; Department of Epidemiology, Massachusetts General Hospital and Harvard Medical School, Boston (D.E.S.); Department of Cardiovascular Medicine, University Hospital Münster, Münster, Germany (G.B.); Centre for Cardiovascular Science, University of Edinburgh and Royal Infirmary of Edinburgh, Edinburgh, Scotland (K.A.A.F.); Bayer HealthCare Pharmaceuticals, Montville, NJ (S.D.B.); Department of Neurology, Ruprecht-Karls-University, Heidelberg, Germany (W.H.); and Stroke Unit, Department of Neurology, Royal Perth Hospital, University of Western Australia, Perth, Australia (G.J.H.)
| | - Manesh R Patel
- From the Department of Medicine and Therapeutics, Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong, China (K.S.L.W.); Heart Center, Peking University People's Hospital, Beijing, China (D.Y.H.); Department of Cardiology, Apollo Hospital, Chennai, India (A.O.); National Heart Centre, Singapore, Singapore (R.-S.T.); Department of Medicine, Division of Cardiology, Duke Clinical Research Institute (M.R.P., K.W.M., R.C.B.) and Department of Medicine, Division of Cardiology, Duke Translational Medicine Institute (R.C.), Duke University Medical Center, Durham, NC; Department of Epidemiology, Massachusetts General Hospital and Harvard Medical School, Boston (D.E.S.); Department of Cardiovascular Medicine, University Hospital Münster, Münster, Germany (G.B.); Centre for Cardiovascular Science, University of Edinburgh and Royal Infirmary of Edinburgh, Edinburgh, Scotland (K.A.A.F.); Bayer HealthCare Pharmaceuticals, Montville, NJ (S.D.B.); Department of Neurology, Ruprecht-Karls-University, Heidelberg, Germany (W.H.); and Stroke Unit, Department of Neurology, Royal Perth Hospital, University of Western Australia, Perth, Australia (G.J.H.)
| | - Daniel E Singer
- From the Department of Medicine and Therapeutics, Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong, China (K.S.L.W.); Heart Center, Peking University People's Hospital, Beijing, China (D.Y.H.); Department of Cardiology, Apollo Hospital, Chennai, India (A.O.); National Heart Centre, Singapore, Singapore (R.-S.T.); Department of Medicine, Division of Cardiology, Duke Clinical Research Institute (M.R.P., K.W.M., R.C.B.) and Department of Medicine, Division of Cardiology, Duke Translational Medicine Institute (R.C.), Duke University Medical Center, Durham, NC; Department of Epidemiology, Massachusetts General Hospital and Harvard Medical School, Boston (D.E.S.); Department of Cardiovascular Medicine, University Hospital Münster, Münster, Germany (G.B.); Centre for Cardiovascular Science, University of Edinburgh and Royal Infirmary of Edinburgh, Edinburgh, Scotland (K.A.A.F.); Bayer HealthCare Pharmaceuticals, Montville, NJ (S.D.B.); Department of Neurology, Ruprecht-Karls-University, Heidelberg, Germany (W.H.); and Stroke Unit, Department of Neurology, Royal Perth Hospital, University of Western Australia, Perth, Australia (G.J.H.)
| | - Günter Breithardt
- From the Department of Medicine and Therapeutics, Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong, China (K.S.L.W.); Heart Center, Peking University People's Hospital, Beijing, China (D.Y.H.); Department of Cardiology, Apollo Hospital, Chennai, India (A.O.); National Heart Centre, Singapore, Singapore (R.-S.T.); Department of Medicine, Division of Cardiology, Duke Clinical Research Institute (M.R.P., K.W.M., R.C.B.) and Department of Medicine, Division of Cardiology, Duke Translational Medicine Institute (R.C.), Duke University Medical Center, Durham, NC; Department of Epidemiology, Massachusetts General Hospital and Harvard Medical School, Boston (D.E.S.); Department of Cardiovascular Medicine, University Hospital Münster, Münster, Germany (G.B.); Centre for Cardiovascular Science, University of Edinburgh and Royal Infirmary of Edinburgh, Edinburgh, Scotland (K.A.A.F.); Bayer HealthCare Pharmaceuticals, Montville, NJ (S.D.B.); Department of Neurology, Ruprecht-Karls-University, Heidelberg, Germany (W.H.); and Stroke Unit, Department of Neurology, Royal Perth Hospital, University of Western Australia, Perth, Australia (G.J.H.)
| | - Kenneth W Mahaffey
- From the Department of Medicine and Therapeutics, Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong, China (K.S.L.W.); Heart Center, Peking University People's Hospital, Beijing, China (D.Y.H.); Department of Cardiology, Apollo Hospital, Chennai, India (A.O.); National Heart Centre, Singapore, Singapore (R.-S.T.); Department of Medicine, Division of Cardiology, Duke Clinical Research Institute (M.R.P., K.W.M., R.C.B.) and Department of Medicine, Division of Cardiology, Duke Translational Medicine Institute (R.C.), Duke University Medical Center, Durham, NC; Department of Epidemiology, Massachusetts General Hospital and Harvard Medical School, Boston (D.E.S.); Department of Cardiovascular Medicine, University Hospital Münster, Münster, Germany (G.B.); Centre for Cardiovascular Science, University of Edinburgh and Royal Infirmary of Edinburgh, Edinburgh, Scotland (K.A.A.F.); Bayer HealthCare Pharmaceuticals, Montville, NJ (S.D.B.); Department of Neurology, Ruprecht-Karls-University, Heidelberg, Germany (W.H.); and Stroke Unit, Department of Neurology, Royal Perth Hospital, University of Western Australia, Perth, Australia (G.J.H.)
| | - Richard C Becker
- From the Department of Medicine and Therapeutics, Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong, China (K.S.L.W.); Heart Center, Peking University People's Hospital, Beijing, China (D.Y.H.); Department of Cardiology, Apollo Hospital, Chennai, India (A.O.); National Heart Centre, Singapore, Singapore (R.-S.T.); Department of Medicine, Division of Cardiology, Duke Clinical Research Institute (M.R.P., K.W.M., R.C.B.) and Department of Medicine, Division of Cardiology, Duke Translational Medicine Institute (R.C.), Duke University Medical Center, Durham, NC; Department of Epidemiology, Massachusetts General Hospital and Harvard Medical School, Boston (D.E.S.); Department of Cardiovascular Medicine, University Hospital Münster, Münster, Germany (G.B.); Centre for Cardiovascular Science, University of Edinburgh and Royal Infirmary of Edinburgh, Edinburgh, Scotland (K.A.A.F.); Bayer HealthCare Pharmaceuticals, Montville, NJ (S.D.B.); Department of Neurology, Ruprecht-Karls-University, Heidelberg, Germany (W.H.); and Stroke Unit, Department of Neurology, Royal Perth Hospital, University of Western Australia, Perth, Australia (G.J.H.)
| | - Robert Califf
- From the Department of Medicine and Therapeutics, Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong, China (K.S.L.W.); Heart Center, Peking University People's Hospital, Beijing, China (D.Y.H.); Department of Cardiology, Apollo Hospital, Chennai, India (A.O.); National Heart Centre, Singapore, Singapore (R.-S.T.); Department of Medicine, Division of Cardiology, Duke Clinical Research Institute (M.R.P., K.W.M., R.C.B.) and Department of Medicine, Division of Cardiology, Duke Translational Medicine Institute (R.C.), Duke University Medical Center, Durham, NC; Department of Epidemiology, Massachusetts General Hospital and Harvard Medical School, Boston (D.E.S.); Department of Cardiovascular Medicine, University Hospital Münster, Münster, Germany (G.B.); Centre for Cardiovascular Science, University of Edinburgh and Royal Infirmary of Edinburgh, Edinburgh, Scotland (K.A.A.F.); Bayer HealthCare Pharmaceuticals, Montville, NJ (S.D.B.); Department of Neurology, Ruprecht-Karls-University, Heidelberg, Germany (W.H.); and Stroke Unit, Department of Neurology, Royal Perth Hospital, University of Western Australia, Perth, Australia (G.J.H.)
| | - Keith A A Fox
- From the Department of Medicine and Therapeutics, Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong, China (K.S.L.W.); Heart Center, Peking University People's Hospital, Beijing, China (D.Y.H.); Department of Cardiology, Apollo Hospital, Chennai, India (A.O.); National Heart Centre, Singapore, Singapore (R.-S.T.); Department of Medicine, Division of Cardiology, Duke Clinical Research Institute (M.R.P., K.W.M., R.C.B.) and Department of Medicine, Division of Cardiology, Duke Translational Medicine Institute (R.C.), Duke University Medical Center, Durham, NC; Department of Epidemiology, Massachusetts General Hospital and Harvard Medical School, Boston (D.E.S.); Department of Cardiovascular Medicine, University Hospital Münster, Münster, Germany (G.B.); Centre for Cardiovascular Science, University of Edinburgh and Royal Infirmary of Edinburgh, Edinburgh, Scotland (K.A.A.F.); Bayer HealthCare Pharmaceuticals, Montville, NJ (S.D.B.); Department of Neurology, Ruprecht-Karls-University, Heidelberg, Germany (W.H.); and Stroke Unit, Department of Neurology, Royal Perth Hospital, University of Western Australia, Perth, Australia (G.J.H.)
| | - Scott D Berkowitz
- From the Department of Medicine and Therapeutics, Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong, China (K.S.L.W.); Heart Center, Peking University People's Hospital, Beijing, China (D.Y.H.); Department of Cardiology, Apollo Hospital, Chennai, India (A.O.); National Heart Centre, Singapore, Singapore (R.-S.T.); Department of Medicine, Division of Cardiology, Duke Clinical Research Institute (M.R.P., K.W.M., R.C.B.) and Department of Medicine, Division of Cardiology, Duke Translational Medicine Institute (R.C.), Duke University Medical Center, Durham, NC; Department of Epidemiology, Massachusetts General Hospital and Harvard Medical School, Boston (D.E.S.); Department of Cardiovascular Medicine, University Hospital Münster, Münster, Germany (G.B.); Centre for Cardiovascular Science, University of Edinburgh and Royal Infirmary of Edinburgh, Edinburgh, Scotland (K.A.A.F.); Bayer HealthCare Pharmaceuticals, Montville, NJ (S.D.B.); Department of Neurology, Ruprecht-Karls-University, Heidelberg, Germany (W.H.); and Stroke Unit, Department of Neurology, Royal Perth Hospital, University of Western Australia, Perth, Australia (G.J.H.)
| | - Werner Hacke
- From the Department of Medicine and Therapeutics, Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong, China (K.S.L.W.); Heart Center, Peking University People's Hospital, Beijing, China (D.Y.H.); Department of Cardiology, Apollo Hospital, Chennai, India (A.O.); National Heart Centre, Singapore, Singapore (R.-S.T.); Department of Medicine, Division of Cardiology, Duke Clinical Research Institute (M.R.P., K.W.M., R.C.B.) and Department of Medicine, Division of Cardiology, Duke Translational Medicine Institute (R.C.), Duke University Medical Center, Durham, NC; Department of Epidemiology, Massachusetts General Hospital and Harvard Medical School, Boston (D.E.S.); Department of Cardiovascular Medicine, University Hospital Münster, Münster, Germany (G.B.); Centre for Cardiovascular Science, University of Edinburgh and Royal Infirmary of Edinburgh, Edinburgh, Scotland (K.A.A.F.); Bayer HealthCare Pharmaceuticals, Montville, NJ (S.D.B.); Department of Neurology, Ruprecht-Karls-University, Heidelberg, Germany (W.H.); and Stroke Unit, Department of Neurology, Royal Perth Hospital, University of Western Australia, Perth, Australia (G.J.H.)
| | - Graeme J Hankey
- From the Department of Medicine and Therapeutics, Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong, China (K.S.L.W.); Heart Center, Peking University People's Hospital, Beijing, China (D.Y.H.); Department of Cardiology, Apollo Hospital, Chennai, India (A.O.); National Heart Centre, Singapore, Singapore (R.-S.T.); Department of Medicine, Division of Cardiology, Duke Clinical Research Institute (M.R.P., K.W.M., R.C.B.) and Department of Medicine, Division of Cardiology, Duke Translational Medicine Institute (R.C.), Duke University Medical Center, Durham, NC; Department of Epidemiology, Massachusetts General Hospital and Harvard Medical School, Boston (D.E.S.); Department of Cardiovascular Medicine, University Hospital Münster, Münster, Germany (G.B.); Centre for Cardiovascular Science, University of Edinburgh and Royal Infirmary of Edinburgh, Edinburgh, Scotland (K.A.A.F.); Bayer HealthCare Pharmaceuticals, Montville, NJ (S.D.B.); Department of Neurology, Ruprecht-Karls-University, Heidelberg, Germany (W.H.); and Stroke Unit, Department of Neurology, Royal Perth Hospital, University of Western Australia, Perth, Australia (G.J.H.)
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Lu Y, Yang J, Zhang H, Yang J. Prediction of warfarin maintenance dose in Han Chinese patients using a mechanistic model based on genetic and non-genetic factors. Clin Pharmacokinet 2014; 52:567-81. [PMID: 23515956 DOI: 10.1007/s40262-013-0054-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
BACKGROUND AND OBJECTIVES Many attempts have been made to predict the warfarin maintenance dose in patients beginning warfarin therapy using a descriptive model based on multiple linear regression. Here we report the first attempt to develop a comprehensive mechanistic model integrating in vitro-in vivo extrapolation (IVIVE) with a pharmacokinetic-pharmacodynamic model to predict the warfarin maintenance dose in Han Chinese patients. The model incorporates demographic factors [sex, age, body weight (BW)] and the genetic polymorphisms of cytochrome P450 (CYP) 2C9 (CYP2C9) and vitamin K epoxide reductase complex subunit 1 (VKORC1). METHODS Information on the various factors, mean warfarin daily dose and International Normalized Ratio (INR) was available for a cohort of 197 Han Chinese patients. Based on in vitro enzyme kinetic parameters for S-warfarin metabolism, demographic data for Han Chinese and some scaling factors, the S-warfarin clearance (CL) was predicted for patients in the cohort with different CYP2C9 genotypes using IVIVE. The plasma concentration of S-warfarin after a single oral dose was simulated using a one-compartment pharmacokinetic model with first-order absorption and a lag time and was combined with a mechanistic coagulation model to simulate the INR response. The warfarin maintenance dose was then predicted based on the demographic data and genotypes of CYP2C9 and VKORC1 for each patient and using the observed steady-state INR (INRss) as a target value. Finally, sensitivity analysis was carried out to determine which factor(s) affect the warfarin maintenance dose most strongly. RESULTS The predictive performance of this mechanistic model is not inferior to that of our previous descriptive model. There were significant differences in the mean warfarin daily dose in patients with different CYP2C9 and VKORC1 genotypes. Using IVIVE, the predicted mean CL of S-warfarin for patients with CYP2C9*1/*3 (0.092 l/h, n = 11) was 57 % less than for those with wild-type *1/*1 (0.215 l/h, n = 186). In addition, *1/*1 patients needed about 1 week to reach steady state, whereas *1/*3 patients needed about 2 weeks. In terms of the predicted INRss values, only ten patients had INRss values outside the expected therapeutic range (1.5-2.8). To evaluate our mechanistic model, we predicted the warfarin maintenance dose for 183 patients and explained 42 % of its variation, which is comparable to our previous prediction using a descriptive model based on multiple linear regression. The mean predicted/observed warfarin doses (mg/day) for different combinations of CYP2C9 and VKORC1 genotypes were 1.54/3.75 (n = 1) for *1/*1 and GG, 3.33/3.66 (n = 36) for *1/*1 and AG, 2.31/2.41 (n = 136) for *1/*1 and AA, and 1.56/1.69 (n = 10) for *1/*3 and AA, respectively. Sensitivity analysis indicated BW and genetic polymorphisms of CYP2C9 and VKORC1 were important factors affecting the warfarin maintenance dose in the study population. CONCLUSION The mechanistic model reported is the first to integrate IVIVE with a pharmacokinetic-pharmacodynamic model to describe the association of the warfarin maintenance dose with sex, age, BW and the genotypes of CYP2C9 and VKORC1. The model was effective in predicting S-warfarin clearance and in simulating its plasma concentration-time curve in a cohort of Han Chinese patients. In addition, the model accurately predicted the INR response and warfarin maintenance dose in a cohort of Han Chinese patients.
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Affiliation(s)
- Yuan Lu
- Center of Drug Metabolism and Pharmacokinetics, China Pharmaceutical University, No. 24 Tongjiaxiang, Nanjing, 210009, China
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19
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Cui Y, Song Y, Wang J, Yu Z, Schuster A, Barrett YC, Frost C. Single- and multiple-dose pharmacokinetics, pharmacodynamics, and safety of apixaban in healthy Chinese subjects. Clin Pharmacol 2013; 5:177-84. [PMID: 24353445 PMCID: PMC3861362 DOI: 10.2147/cpaa.s51981] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
BACKGROUND The pharmacokinetics (PK), pharmacodynamics (PD), and safety of apixaban were assessed in healthy Chinese subjects in this randomized, placebo-controlled, double-blind, single-sequence, single- and multiple-dose study. SUBJECTS AND METHODS Eighteen subjects 18-45 years of age were randomly assigned (2:1 ratio) to receive apixaban or matched placebo. Subjects received a single 10 mg dose of apixaban or placebo on day 1, followed by 10 mg apixaban or placebo twice daily for 6 days (days 4-9). The PK and PD of apixaban were assessed by collecting plasma samples for 72 hours following the dose on day 1 and the morning dose on day 9, and measuring apixaban concentration and anti-Xa activity. Safety was assessed via physical examinations, vital sign measurements, electrocardiograms, and clinical laboratory evaluations. RESULTS PK analysis showed similar characteristics of apixaban after single and multiple doses, including a median time to maximum concentration of ~3 hours, mean elimination half-life of ~11 hours, and renal clearance of ~1.2 L/hour. The accumulation index was 1.7, consistent with twice-daily dosing and the observed elimination half-life. Single-dose data predict multiple-dose PK, therefore apixaban PK are time-independent. The relationship between anti-Xa activity and plasma apixaban concentrations appears to be linear. Apixaban was safe and well tolerated, with no bleeding-related adverse events reported. CONCLUSION Apixaban was safe and well tolerated in healthy Chinese subjects. Apixaban PK and PD were predictable and consistent with findings from previous studies in Asian and non-Asian subjects. The administration of apixaban does not require any dose modification based on race.
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Affiliation(s)
- Yimin Cui
- Peking University First Hospital, Beijing, People’s Republic of China
| | - Yan Song
- Bristol-Myers Squibb, Princeton, NJ, USA
| | | | - Zhigang Yu
- Bristol-Myers Squibb, Princeton, NJ, USA
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Harnisch L, Shepard T, Pons G, Della Pasqua O. Modeling and simulation as a tool to bridge efficacy and safety data in special populations. CPT-PHARMACOMETRICS & SYSTEMS PHARMACOLOGY 2013; 2:e28. [PMID: 23835939 PMCID: PMC3600759 DOI: 10.1038/psp.2013.6] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The registration and approval of novel medicines have traditionally been based on evidence arising from large prospective trials. Such an approach is often not possible or unsuitable to evaluate the benefit-risk balance in special populations (e.g., children, ethnic groups, rare diseases). Inferences by modeling and simulation can play a major role in evidence synthesis. A framework is proposed that promotes its acceptability and the basis for decision making during development, registration, and therapeutic use of drugs.
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Affiliation(s)
- L Harnisch
- Pfizer, Pharmacometrics, Global Clinical Pharmacology, Sandwich, UK
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Hirota T, Eguchi S, Ieiri I. Impact of genetic polymorphisms in CYP2C9 and CYP2C19 on the pharmacokinetics of clinically used drugs. Drug Metab Pharmacokinet 2012; 28:28-37. [PMID: 23165865 DOI: 10.2133/dmpk.dmpk-12-rv-085] [Citation(s) in RCA: 81] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Human cytochrome P450 (CYP) is a superfamily of hemoproteins which oxidize a number of endogenous compounds and xenobiotics. The human CYP2C subfamily consists of four members: CYP2C8, CYP2C9, CYP2C18 and CYP2C19. CYP2C9 and CYP2C19 are important drug-metabolizing enzymes and together metabolize approximately 20% of therapeutically used drugs. Forty-two allelic variants for CYP2C9 and 34 for CYP2C19 have been reported. The frequencies of these variants show marked inter-ethnic variation. The functional consequences of genetic polymorphisms have been examined, and many studies have shown the clinical importance of these polymorphisms. Current evidence suggests that taking the genetically determined metabolic capacity of CYP2C9 and CYP2C19 into account has the potential to improve individual risk/benefit relationships. However, more prospective studies with clinical endpoints are needed before the paradigm of "personalized medicine" based on the variants can be established. This review summarizes the currently available important information on this topic.
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Affiliation(s)
- Takeshi Hirota
- Department of Clinical Pharmacokinetics, Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka, Japan
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22
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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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Integrating interacting drugs and genetic variations to improve the predictability of warfarin maintenance dose in Chinese patients. Pharmacogenet Genomics 2012; 22:176-82. [DOI: 10.1097/fpc.0b013e32834f45f9] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Population pharmacokinetic modelling of S-warfarin to evaluate the design of drug–drug interaction studies for CYP2C9. J Pharmacokinet Pharmacodyn 2012; 39:147-60. [DOI: 10.1007/s10928-011-9235-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2011] [Accepted: 12/15/2011] [Indexed: 11/27/2022]
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Teo SM, Ku CS, Salim A, Naidoo N, Chia KS, Pawitan Y. Regions of homozygosity in three Southeast Asian populations. J Hum Genet 2011; 57:101-8. [PMID: 22129560 DOI: 10.1038/jhg.2011.132] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The genomes of outbred populations were first shown in 2006 to contain regions of homozygosity (ROHs) of several megabases. Further studies have also investigated the characteristics of ROHs in healthy individuals in various populations but there are no studies on Singapore populations to date. This study aims to identify and investigate the characteristics of ROHs in three Singapore populations. A total of 268 samples (96 Chinese, 89 Malays and 83 Indians) are genotyped on Illumina Human 1 M Beadchip and Affymetrix Genome-Wide Human SNP Array 6.0. We use the PennCNV algorithm to detect ROHs. We report an abundance of ROHs (≥500 kb), with an average of more than one hundred regions per individual. On average, the Indian population has the lowest number of ROHs and smallest total length of ROHs per individual compared with the Chinese and Malay populations. We further investigate the relationship between the occurrence of ROHs and haplotype frequency, regional linkage disequilibrium (LD) and positive selection. Based on the results of this data set, we find that the frequency of occurrence of ROHs is positively associated with haplotype frequency and regional LD. The majority of regions detected for recent positive selection and regions with differential LD between populations overlap with the ROH loci. When we consider both the location of the ROHs and the allelic form of the ROHs, we are able to separate the populations by principal component analysis, demonstrating that ROHs contain information on population structure and the demographic history of a population.
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Affiliation(s)
- Shu-Mei Teo
- Centre for Molecular Epidemiology, National University of Singapore, Singapore.
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Perlstein TS, Goldhaber SZ, Nelson K, Joshi V, Morgan TV, Lesko LJ, Lee JY, Gobburu J, Schoenfeld D, Kucherlapati R, Freeman MW, Creager MA. The Creating an Optimal Warfarin Nomogram (CROWN) Study. Thromb Haemost 2011; 107:59-68. [PMID: 22116191 DOI: 10.1160/th11-08-0568] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2011] [Accepted: 10/23/2011] [Indexed: 11/05/2022]
Abstract
A significant proportion of warfarin dose variability is explained by variation in the genotypes of the cytochrome P450 CYP2C9 and the vitamin K epoxide reductase complex, VKORC1, enzymes that influence warfarin metabolism and sensitivity, respectively. We sought to develop an optimal pharmacogenetic warfarin dosing algorithm that incorporated clinical and genetic information. We enroled patients initiating warfarin therapy. Genotyping was performed of the VKORC1, -1639G>A, the CYP2C9*2, 430C>T, and the CYP2C9*3, 1075C>A genotypes. The initial warfarin dosing algorithm (Algorithm A) was based upon established clinical practice and published warfarin pharmacogenetic information. Subsequent dosing algorithms (Algorithms B and Algorithm C) were derived from pharmacokinetic / pharmacodynamic (PK/PD) modelling of warfarin dose, international normalised ratio (INR), clinical and genetic factors from patients treated by the preceding algorithm(s). The primary outcome was the time in the therapeutic range, considered an INR of 1.8 to 3.2. A total of 344 subjects are included in the study analyses. The mean percentage time within the therapeutic range for each subject increased progressively from Algorithm A to Algorithm C from 58.9 (22.0), to 59.7 (23.0), to 65.8 (16.9) percent (p = 0.04). Improvement also occurred in most secondary endpoints, which included the per-patient percentage of INRs outside of the therapeutic range (p = 0.004), the time to the first therapeutic INR (p = 0.07), and the time to achieve stable therapeutic anticoagulation (p < 0.001). In conclusion, warfarin pharmacogenetic dosing can be optimised in real time utilising observed PK/PD information in an adaptive fashion.
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Affiliation(s)
- Todd S Perlstein
- Division of Cardiovascular Medicine, Brigham and Women's Hospital, Boston, MA 02115, USA
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Duffull SB, Wright DFB, Winter HR. Interpreting population pharmacokinetic-pharmacodynamic analyses - a clinical viewpoint. Br J Clin Pharmacol 2011; 71:807-14. [PMID: 21204908 DOI: 10.1111/j.1365-2125.2010.03891.x] [Citation(s) in RCA: 79] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
The population analysis approach is an important tool for clinical pharmacology in aiding the dose individualization of medicines. However, due to their statistical complexity the clinical utility of population analyses is often overlooked. One of the key reasons to conduct a population analysis is to investigate the potential benefits of individualization of drug dosing based on patient characteristics (termed covariate identification). The purpose of this review is to provide a tool to interpret and extract information from publications that describe population analysis. The target audience is those readers who are aware of population analyses but have not conducted the technical aspects of an analysis themselves. Initially we introduce the general framework of population analysis and work through a simple example with visual plots. We then follow-up with specific details on how to interpret population analyses for the purpose of identifying covariates and how to interpret their likely importance for dose individualization.
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Affiliation(s)
- Stephen B Duffull
- School of Pharmacy, University of Otago, PO Box 56, Dunedin 9054, New Zealand.
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28
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Weng CT, Chung TJ, Liu MF, Weng MY, Lee CH, Chen JY, Wu AB, Lin BW, Luo CY, Hsu SC, Lee BF, Tsai HM, Chao SC, Wang JY, Chen TY, Chen CW, Chang HY, Wang CR. A retrospective study of pulmonary infarction in patients with systemic lupus erythematosus from southern Taiwan. Lupus 2011; 20:876-85. [PMID: 21693494 DOI: 10.1177/0961203311401458] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Since large-scale reports of pulmonary infarction in systemic lupus erythematosus (SLE) are limited, a retrospective study was performed for this manifestation in 773 hospitalized patients in southern Taiwan from 1999 to 2009. Pulmonary infarction was defined as the presence of pulmonary embolism, persistent pulmonary infiltrates, and characteristic clinical symptoms. Demographic, clinical, laboratory, and radiological images data were analyzed. There were 12 patients with pulmonary embolism and 9 of them had antiphospholipid syndrome (APS). Six patients (19 to 53 years, average 38.2 ± 12.6) with 9 episodes of lung infarction were identified. All cases were APS and four episodes had coincidental venous thromboembolism. There were four episodes of bilateral infarction and seven episodes of larger central pulmonary artery embolism. Heparin therapy was routinely prescribed and thrombolytic agents were added in two episodes. Successful recovery was noted in all patients. In conclusion, there was a 0.8% incidence of pulmonary infarction in patients with SLE, all with the risk factor of APS. Differentiation between pulmonary infarction and pneumonia in lupus patients should be made; they have similar chest radiography with lung consolidation but require a different clinical approach in management. Although this report is a retrospective study with relatively small numbers of lupus patients with lung infarcts, our observation might provide beneficial information on the clinical features and radiological presentations during the disease evolution of pulmonary infarction in SLE with APS.
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Affiliation(s)
- CT Weng
- Section of Rheumatology and Immunology, Department of Internal Medicine, National Cheng Kung University Hospital and Dou-Liou Branch, Tainan, Taiwan–Republic of China
| | - TJ Chung
- Department of Radiology, National Cheng Kung University Hospital, Tainan, Taiwan–Republic of China
| | - MF Liu
- Section of Rheumatology and Immunology, Department of Internal Medicine, National Cheng Kung University Hospital and Dou-Liou Branch, Tainan, Taiwan–Republic of China
| | - MY Weng
- Section of Rheumatology and Immunology, Department of Internal Medicine, National Cheng Kung University Hospital and Dou-Liou Branch, Tainan, Taiwan–Republic of China
| | - CH Lee
- Section of Cardiology, Department of Internal Medicine, National Cheng Kung University Hospital, Tainan, Taiwan–Republic of China
| | - JY Chen
- Section of Cardiology, Department of Internal Medicine, National Cheng Kung University Hospital, Tainan, Taiwan–Republic of China
| | - AB Wu
- Section of Nephrology, Department of Internal Medicine, National Cheng Kung University Hospital, Tainan, Taiwan–Republic of China
| | - BW Lin
- Department of Surgery, National Cheng Kung University Hospital, Tainan, Taiwan–Republic of China
| | - CY Luo
- Department of Surgery, National Cheng Kung University Hospital, Tainan, Taiwan–Republic of China
| | - SC Hsu
- Department of Emergency Medicine, National Cheng Kung University Hospital, Tainan, Taiwan–Republic of China
| | - BF Lee
- Department of Nuclear Medicine, National Cheng Kung University Hospital, Tainan, Taiwan–Republic of China
| | - HM Tsai
- Department of Radiology, National Cheng Kung University Hospital, Tainan, Taiwan–Republic of China
| | - SC Chao
- Department of Dermatology, National Cheng Kung University Hospital, Tainan, Taiwan–Republic of China
| | - JY Wang
- Department of Pediatrics, National Cheng Kung University Hospital, Tainan, Taiwan–Republic of China
| | - TY Chen
- Section of Hemato-oncology, Department of Internal Medicine, National Cheng Kung University Hospital, Tainan, Taiwan–Republic of China
| | - CW Chen
- Section of Critical Care Medicine, Department of Internal Medicine, National Cheng Kung University Hospital, Tainan, Taiwan–Republic of China
| | - HY Chang
- Section of Chest Medicine, Department of Internal Medicine, National Cheng Kung University Hospital, Tainan, Taiwan–Republic of China
| | - CR Wang
- Section of Rheumatology and Immunology, Department of Internal Medicine, National Cheng Kung University Hospital and Dou-Liou Branch, Tainan, Taiwan–Republic of China
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Optimization of warfarin dose by population-specific pharmacogenomic algorithm. THE PHARMACOGENOMICS JOURNAL 2011; 12:306-11. [PMID: 21358752 DOI: 10.1038/tpj.2011.4] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
To optimize the warfarin dose, a population-specific pharmacogenomic algorithm was developed using multiple linear regression model with vitamin K intake and cytochrome P450 IIC polypeptide9 (CYP2C9(*)2 and (*)3), vitamin K epoxide reductase complex 1 (VKORC1(*)3, (*)4, D36Y and -1639 G>A) polymorphism profile of subjects who attained therapeutic international normalized ratio as predictors. New algorithm was validated by correlating with Wadelius, International Warfarin Pharmacogenetics Consortium and Gage algorithms; and with the therapeutic dose (r=0.64, P<0.0001). New algorithm was more accurate (Overall: 0.89 vs 0.51, warfarin resistant: 0.96 vs 0.77 and warfarin sensitive: 0.80 vs 0.24), more sensitive (0.87 vs 0.52) and specific (0.93 vs 0.50) compared with clinical data. It has significantly reduced the rate of overestimation (0.06 vs 0.50) and underestimation (0.13 vs 0.48). To conclude, this population-specific algorithm has greater clinical utility in optimizing the warfarin dose, thereby decreasing the adverse effects of suboptimal dose.
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The influence of genetic polymorphisms and interacting drugs on initial response to warfarin in Chinese patients with heart valve replacement. Eur J Clin Pharmacol 2011; 67:581-90. [DOI: 10.1007/s00228-011-0995-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2010] [Accepted: 01/10/2011] [Indexed: 10/18/2022]
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Wright DFB, Duffull SB. Development of a bayesian forecasting method for warfarin dose individualization. Pharm Res 2011; 28:1100-11. [PMID: 21301936 DOI: 10.1007/s11095-011-0369-x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2010] [Accepted: 01/10/2011] [Indexed: 12/17/2022]
Abstract
PURPOSE The aim of this study was to develop a Bayesian dose individualization tool for warfarin. This was incorporated into the freely available software TCIWorks ( www.tciworks.info ) for use in the clinic. METHODS All pharmacokinetic and pharmacodynamic (PKPD) models for warfarin in the medical literature were identified and evaluated against two warfarin datasets. The model with the best external validity was used to develop an optimal design for Bayesian parameter control. The performance of this design was evaluated using simulation-estimation techniques. Finally, the model was implemented in TCIWorks. RESULTS A recently published warfarin KPD model was found to provide the best fit for the two external datasets. Optimal sampling days within the first 14 days of therapy were found to be days 3, 4, 5, 11, 12, 13 and 14. Simulations and parameter estimations suggested that the design will provide stable estimates of warfarin clearance and EC50. A single patient example showed the potential clinical utility of the method in TCIWorks. CONCLUSIONS A Bayesian dose individualization tool for warfarin was developed. Future research to assess the predictive performance of the tool in warfarin patients is required.
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Affiliation(s)
- Daniel F B Wright
- School of Pharmacy, University of Otago, PO Box 56, Dunedin 9054, New Zealand.
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Gan GG, Phipps ME, Lee MMT, Lu LS, Subramaniam RY, Bee PC, Chang SH. Contribution of VKORC1 and CYP2C9 polymorphisms in the interethnic variability of warfarin dose in Malaysian populations. Ann Hematol 2010; 90:635-41. [DOI: 10.1007/s00277-010-1119-6] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2009] [Accepted: 11/09/2010] [Indexed: 11/24/2022]
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