Not provided
| ID | Type | Description | Link |
|---|---|---|---|
| 223062 | Other Grant/Funding Number | European Union - Seventh Framework Programme | |
| 2009-016994-13 | EudraCT Number |
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
| Name | Class |
|---|---|
| Utrecht University | OTHER |
| Leiden University Medical Center | OTHER |
| Erasmus Medical Center | OTHER |
| University of Ulm |
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Rationale:
The narrow therapeutic range and wide inter-patient variability in dose requirement make anticoagulation response to coumarin derivatives unpredictable. As a result, patients require frequent monitoring to avert adverse effects and maintain therapeutic efficacy. Polymorphisms in cytochrome P450 2C9 (CYP2C9) and vitamin K epoxide reductase complex 1 (VKORC1) jointly account for about 40% of the inter-individual variability in dose requirements. To date, several pharmacogenetic guided dosing algorithms for coumarin derivatives, predominately for warfarin, have been developed. However, the potential benefit of these dosing algorithms in terms of their safety and clinical utility has not been adequately investigated in randomised settings.
Objective:
To determine whether a dosing algorithm containing genetic information increases the time within therapeutic INR range during anticoagulation therapy with each of warfarin, acenocoumarol and phenprocoumon compared to a dosing regimen that does not contain this information. Secondary outcomes of the study include cost effectiveness, number of thromboembolic and bleeding events, time to reach stable dose and number of supratherapeutic INR peaks.
Study design:
This is a two-armed, single-blinded, randomised controlled trial. In one arm (intervention) patients commencing anticoagulation therapy with either warfarin, acenocoumarol or phenprocoumon will be dosed according to a drug-specific genotype-guided dosing algorithm, which is based on genetic information, clinical data and (in the monitoring phase) previous INR. For the other arm (control) patients will be dosed according to a non-genotype-guided dosing regimen which does not include genetic information. The follow-up period per patient is 3 months.
Study population:
Newly diagnosed patients of both genders and at least 18 years old who need anticoagulant treatment with either acenocoumarol, phenprocoumon or warfarin within the low intensity INR range will be included in the trial. Main study parameters/endpoints: The % time within therapeutic INR range in the first 3 months of anticoagulation therapy. Nature and extent of the burden and risks associated with participation, benefit and group relatedness: Six extra blood samples are taken from each participant at the start of the study. Patients also have to attend 8 scheduled visits within the 3 months study period and are asked to fill in questionnaires. The genotype-guided dosing algorithm is anticipated to improve the accuracy of coumarin dosing and thus improve the safety and efficacy of anticoagulation therapy.
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Non-genotype-guided dosing algorithm | Active Comparator |
| |
| Genotype-guided dosing algorithm | Experimental |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Genotype-guided dosing algorithm | Other | Loading and monitoring dose according to genotype-guided dosing algorithm |
|
| Measure | Description | Time Frame |
|---|---|---|
| Percent time within therapeutic INR range 2-3 during 12 weeks following the initiation of coumarin therapy | 12 weeks | |
| Number of patients with INR > or = 4.0, which indicates overanticoagulation | 12 weeks |
| Measure | Description | Time Frame |
|---|---|---|
| Time INR > or = 4.0, which indicates overanticoagulation | 12 weeks | |
| Percent time spent > or = INR 4.0 | 12 weeks | |
| Percent time spent < or = INR 2, which indicates under-anticoagulation |
Not provided
Inclusion Criteria:
Exclusion Criteria:
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
Not provided
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Elisabethinen Hospital Linz | Linz | Austria | ||||
| University of Ulm |
| PubMed Identifier | Type | Citation | Retractions |
|---|---|---|---|
| 19842940 | Background | van Schie RM, Wadelius MI, Kamali F, Daly AK, Manolopoulos VG, de Boer A, Barallon R, Verhoef TI, Kirchheiner J, Haschke-Becher E, Briz M, Rosendaal FR, Redekop WK, Pirmohamed M, Maitland van der Zee AH. Genotype-guided dosing of coumarin derivatives: the European pharmacogenetics of anticoagulant therapy (EU-PACT) trial design. Pharmacogenomics. 2009 Oct;10(10):1687-95. doi: 10.2217/pgs.09.125. | |
| 20602617 |
Not provided
Not provided
Not provided
| ID | Term |
|---|---|
| D054556 | Venous Thromboembolism |
| D001281 | Atrial Fibrillation |
| ID | Term |
|---|---|
| D013923 | Thromboembolism |
| D016769 | Embolism and Thrombosis |
| D014652 | Vascular Diseases |
| D002318 | Cardiovascular Diseases |
Not provided
Not provided
| OTHER |
| Newcastle University | OTHER |
| University of Liverpool | OTHER |
| LGC Limited | INDUSTRY |
| Uppsala University | OTHER |
| Democritus University of Thrace | OTHER |
| Elisabethinen Hospital | OTHER |
Not provided
Not provided
Not provided
Not provided
Not provided
| Non-genotype-guided dosing algorithm | Other | Loading and monitoring dose according to non-genotype-guided dosing algorithm |
|
| 12 weeks |
| Time to reach therapeutic INR defined as the time to the first INR within target range, providing that a subsequent INR > or =1 week later is also within target range | 12 weeks |
| Time to reach stable dose defined as INR within target range for a period of at least 3 weeks with <10% change in dose | 12 weeks |
| Time to and number of minor and major bleeding events | 12 weeks |
| Time to and number of thromboembolic events (therapeutic failure) | 12 weeks |
| The incidence of coumarin sensitivity | 12 weeks |
| The incidence of coumarin resistance | 12 weeks |
| Number of coumarin dose adjustments | 12 weeks |
| The clinical utility of the rapid genotyping test developed by LGC | 2 years |
| Quality of life as reported by the patient tested by the EuroQol (EQ)-5D questionnaire | 12 weeks |
| The cost-effectiveness of genotype-guided dosing for each coumarin compared with non-genotype-guided dosing | Will be assessed after inclusion of all patients |
| Ulm |
| Germany |
| Utrecht University | Utrecht | Netherlands |
| Background |
| Verhoef TI, Redekop WK, Darba J, Geitona M, Hughes DA, Siebert U, de Boer A, Maitland-van der Zee AH, Barallon R, Briz M, Daly A, Haschke-Becher E, Kamali F, Kirchheiner J, Manolopoulos VG, Pirmohamed M, Rosendaal FR, van Schie RM, Wadelius M; EU-PACT Group. A systematic review of cost-effectiveness analyses of pharmacogenetic-guided dosing in treatment with coumarin derivatives. Pharmacogenomics. 2010 Jul;11(7):989-1002. doi: 10.2217/pgs.10.74. |
| 19693633 | Background | van Schie RM, Jorgensen AL, de Boer A, Maitland-van der Zee AH; EU-PACT study group. Systematic review of pharmacogenetic warfarin dosing. J Gen Intern Med. 2009 Oct;24(10):1171. doi: 10.1007/s11606-009-1083-9. No abstract available. |
| 23096528 | Background | van Schie RM, Verhoef TI, Boejharat SB, Schalekamp T, Wessels JA, le Cessie S, Rosendaal FR, van der Meer FJ, de Boer A, Maitland-van der Zee AH. Evaluation of the effect of statin use on the acenocoumarol and phenprocoumon maintenance dose. Drug Metabol Drug Interact. 2012;27(4):229-34. doi: 10.1515/dmdi-2012-0024. |
| 23016521 | Background | Verhoef TI, Redekop WK, Hegazy H, de Boer A, Maitland-van der Zee AH; EU-PACT group. Long-term anticoagulant effects of CYP2C9 and VKORC1 genotypes in phenprocoumon users. J Thromb Haemost. 2012 Dec;10(12):2610-2. doi: 10.1111/jth.12007. No abstract available. |
| 22966889 | Background | Verhoef TI, Redekop WK, van Schie RM, Bayat S, Daly AK, Geitona M, Haschke-Becher E, Hughes DA, Kamali F, Levin LA, Manolopoulos VG, Pirmohamed M, Siebert U, Stingl JC, Wadelius M, de Boer A, Maitland-van der Zee AH; EU-PACT group. Cost-effectiveness of pharmacogenetics in anticoagulation: international differences in healthcare systems and costs. Pharmacogenomics. 2012 Sep;13(12):1405-17. doi: 10.2217/pgs.12.124. |
| 22920394 | Background | van Schie RM, el Khedr N, Verhoef TI, Teichert M, Stricker BH, Hofman A, Buhre PN, Wessels JA, Schalekamp T, le Cessie S, van der Meer FJ, Rosendaal FR, de Boer A, Maitland-van der Zee AH, Visser LE. Validation of the acenocoumarol EU-PACT algorithms: similar performance in the Rotterdam Study cohort as in the original study. Pharmacogenomics. 2012 Aug;13(11):1239-45. doi: 10.2217/pgs.12.101. |
| 22409277 | Background | van Schie RM, Babajeff AM, Schalekamp T, Wessels JA, le Cessie S, de Boer A, van der Meer FJ, van Meegen E, Verhoef TI, Rosendaal FR, Maitland-van der Zee AH; EU-PACT study group. An evaluation of gene-gene interaction between the CYP2C9 and VKORC1 genotypes affecting the anticoagulant effect of phenprocoumon and acenocoumarol. J Thromb Haemost. 2012 May;10(5):767-72. doi: 10.1111/j.1538-7836.2012.04694.x. |
| 22252093 | Background | Verhoef TI, Redekop WK, Buikema MM, Schalekamp T, Van Der Meer FJ, Le Cessie S, Wessels JA, Van Schie RM, De Boer A, Teichert M, Visser LE, Maitland-Van Der Zee AH; EU-PACT Group. Long-term anticoagulant effects of the CYP2C9 and VKORC1 genotypes in acenocoumarol users. J Thromb Haemost. 2012 Apr;10(4):606-14. doi: 10.1111/j.1538-7836.2012.04633.x. |
| 22012312 | Background | Avery PJ, Jorgensen A, Hamberg AK, Wadelius M, Pirmohamed M, Kamali F; EU-PACT Study Group. A proposal for an individualized pharmacogenetics-based warfarin initiation dose regimen for patients commencing anticoagulation therapy. Clin Pharmacol Ther. 2011 Nov;90(5):701-6. doi: 10.1038/clpt.2011.186. Epub 2011 Sep 28. |
| 21636598 | Background | van Schie RM, Wessels JA, le Cessie S, de Boer A, Schalekamp T, van der Meer FJ, Verhoef TI, van Meegen E, Rosendaal FR, Maitland-van der Zee AH; EU-PACT Study Group. Loading and maintenance dose algorithms for phenprocoumon and acenocoumarol using patient characteristics and pharmacogenetic data. Eur Heart J. 2011 Aug;32(15):1909-17. doi: 10.1093/eurheartj/ehr116. Epub 2011 Jun 2. |
| 23215884 | Background | van Schie RM, Wessels JA, Verhoef TI, Schalekamp T, le Cessie S, van der Meer FJ, Rosendaal FR, Visser LE, Teichert M, Hofman A, Buhre PN, de Boer A, Maitland-van der Zee AH. Evaluation of the effect of genetic variations in GATA-4 on the phenprocoumon and acenocoumarol maintenance dose. Pharmacogenomics. 2012 Dec;13(16):1917-23. doi: 10.2217/pgs.12.174. |
| 22497277 | Background | Verhoef TI, Zuurhout MJ, van Schie RM, Redekop WK, van der Meer FJ, le Cessie S, Schalekamp T, de Boer A, Maitland-van der Zee AH. The effect of omeprazole and esomeprazole on the maintenance dose of phenprocoumon. Br J Clin Pharmacol. 2012 Dec;74(6):1068-9. doi: 10.1111/j.1365-2125.2012.04295.x. No abstract available. |
| 21919599 | Background | van Schie RM, de Boer A, Maitland-van der Zee AH. Implementation of pharmacogenetics in clinical practice is challenging. Pharmacogenomics. 2011 Sep;12(9):1231-3. doi: 10.2217/pgs.11.81. No abstract available. |
| 19761363 | Background | van Schie RM, Cascorbi I, Maitland-van der Zee AH. Conference Scene: Pharmacogenomics at the second PharmSciFair 2009: adverse drug reactions and clinical implementation. Pharmacogenomics. 2009 Sep;10(9):1389-91. doi: 10.2217/pgs.09.95. |
| 28063245 | Derived | Baranova EV, Verhoef TI, Ragia G, le Cessie S, Asselbergs FW, de Boer A, Manolopoulos VG, Maitland-van der Zee AH; EU-PACT group. Dosing algorithms for vitamin K antagonists across VKORC1 and CYP2C9 genotypes. J Thromb Haemost. 2017 Mar;15(3):465-472. doi: 10.1111/jth.13615. Epub 2017 Feb 17. |
| 24251360 | Derived | Verhoef TI, Ragia G, de Boer A, Barallon R, Kolovou G, Kolovou V, Konstantinides S, Le Cessie S, Maltezos E, van der Meer FJ, Redekop WK, Remkes M, Rosendaal FR, van Schie RM, Tavridou A, Tziakas D, Wadelius M, Manolopoulos VG, Maitland-van der Zee AH; EU-PACT Group. A randomized trial of genotype-guided dosing of acenocoumarol and phenprocoumon. N Engl J Med. 2013 Dec 12;369(24):2304-12. doi: 10.1056/NEJMoa1311388. Epub 2013 Nov 19. |
| D001145 |
| Arrhythmias, Cardiac |
| D006331 | Heart Diseases |
| D010335 | Pathologic Processes |
| D013568 | Pathological Conditions, Signs and Symptoms |