E.1 Medical condition or disease under investigation |
E.1.1 | Medical condition(s) being investigated |
Patients with antiphospholipid syndrome (APS), with or without systemic lupus erythematosus (SLE). |
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E.1.1.1 | Medical condition in easily understood language |
Patients with a condition where antibodies can affect the blood coagulation mechanisms leading to blood clots (antiphospholipid syndrome or APS), with or without ‘Lupus’ (systemic lupus erythematosus |
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E.1.1.2 | Therapeutic area | Diseases [C] - Immune System Diseases [C20] |
MedDRA Classification |
E.1.2 Medical condition or disease under investigation |
E.1.2 | Version | 14.1 |
E.1.2 | Level | PT |
E.1.2 | Classification code | 10002817 |
E.1.2 | Term | Antiphospholipid syndrome |
E.1.2 | System Organ Class | 10021428 - Immune system disorders |
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E.1.3 | Condition being studied is a rare disease | No |
E.2 Objective of the trial |
E.2.1 | Main objective of the trial |
The primary aim of the trial is to assess whether the anticoagulant effects of rivaroxaban are not inferior to those of warfarin. This will be achieved by comparing the percentage change in endogenous thrombin potential (ETP), assessed by the thrombin generation test (TGT), from randomisation to day 42. The TGT is a global measure of anticoagulation, which can assess the anticoagulant effects of both rivaroxaban and warfarin (drugs with very different modes of action on the coagulation mechanism). The TGTs will be performed in the UCL Haemostasis Research Unit. |
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E.2.2 | Secondary objectives of the trial |
1) To compare the effectiveness of the treatment between the two arms of the trial: i) Further blood clots in blood vessels (venous thromboembolism) ii) A combination of further venous thromboembolism and other thrombotic events 2) To compare serious adverse events and all bleeding events in patients on rivaroxaban versus those on warfarin 3) To compare the completed quality of life questionnaires at baseline and at day 180 for patients on rivaroxaban versus those on warfarin. 4) To assess compliance to the study drugs by performing assays in the plasma from the patients on rivaroxaban (anti-Xa assay) and in patients on warfarin (INR and factor X amidolytic assay as an antiphospholipid antibody-independent assessment of anticoagulation). Percentage time in therapeutic range (TTR) between baseline and day 180 will be calculated in patients on warfarin. |
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E.2.3 | Trial contains a sub-study | No |
E.3 | Principal inclusion criteria |
1) Patients with thrombotic APS, with or without SLE, who have had either a single episode of VTE whilst not on anticoagulation or recurrent episode(s) which occurred whilst off anticoagulation or on sub-therapeutic anticoagulant therapy 2) Patients with a target INR of 2.5 (range 2.0 – 3.0) 3) Treated with warfarin for a minimum period of six months since last VTE 4) Female patients must be using adequate contraception with exception to postmenopausal or sterilised women |
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E.4 | Principal exclusion criteria |
1) Previous arterial thrombotic events due to APS 2) Recurrent venous thromboembolic events whilst on warfarin 3) Pregnant or lactating women 4) Severe renal impairment (creatinine clearance (calculated using the Cockcroft & Gault Equation Appendix A) < 30 mL/min (i.e. 29 mL/min or less)) 5) Liver function tests (ALT > 2 x ULN) 6) Thrombocytopenia (platelets < 75 x 10^9/L) 7) Non-compliance on warfarin (based on clinical assessment) 8) Patients on azole antifungals (e.g. ketoconazole, itraconazole, voriconazole and posaconazole) 9) Patents on Human Immunodeficiency Virus (HIV) protease inhibitors (e.g. ritonavir) 10) Patients on strong CYP3A4 inducers (e.g. rifampicin, phenytoin, carbamazepine or phenobarbital) 11) Patients less than 18 years of age |
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E.5 End points |
E.5.1 | Primary end point(s) |
Percentage change in endogenous thrombin potential (ETP), assessed by the thrombin generation test (TGT), from randomisation to day 42. |
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E.5.1.1 | Timepoint(s) of evaluation of this end point |
The time point for the primary outcome is at the first trial visit, which will take place 42 days (±12days) after trial randomisation. |
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E.5.2 | Secondary end point(s) |
a) Efficacy: i) recurrent venous thromboembolism (VTE) alone; ii) a composite of recurrent VTE and other thrombotic events. iii) The thrombin generation curve will also be quantified in terms of: the lag-time; the time to peak; and peak thrombin concentration. b) Safety: i) serious adverse events; ii) all bleeding events. c) Quality of life (QoL): EQ5D 5L. d) Laboratory assessment of compliance: i) anti-Xa assay in patients on rivaroxaban; ii) factor X amidolytic assay as an antiphospholipid antibody-independent assessment of anticoagulation, in addition to an International Normalised Ratio (INR) in patients on warfarin, iii) percentage time in therapeutic range (TTR) between baseline and day 180 in patients on warfarin. |
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E.5.2.1 | Timepoint(s) of evaluation of this end point |
All bleeding and thrombotic events are going to be collected at each visit (day 42 (±12 days), day 90 (±21 days), day 180 (±21 days) and day 210 (±21 days)). Quality of life will be measured at baseline and at six months using the EQ 5D 5L questionnaire. Laboratory measures of compliance will be measured at day 42 (±12 days) on trial treatment. |
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E.6 and E.7 Scope of the trial |
E.6 | Scope of the trial |
E.6.1 | Diagnosis | No |
E.6.2 | Prophylaxis | No |
E.6.3 | Therapy | No |
E.6.4 | Safety | Yes |
E.6.5 | Efficacy | Yes |
E.6.6 | Pharmacokinetic | No |
E.6.7 | Pharmacodynamic | No |
E.6.8 | Bioequivalence | No |
E.6.9 | Dose response | No |
E.6.10 | Pharmacogenetic | No |
E.6.11 | Pharmacogenomic | No |
E.6.12 | Pharmacoeconomic | No |
E.6.13 | Others | No |
E.7 | Trial type and phase |
E.7.1 | Human pharmacology (Phase I) | No |
E.7.1.1 | First administration to humans | No |
E.7.1.2 | Bioequivalence study | No |
E.7.1.3 | Other | No |
E.7.1.3.1 | Other trial type description | |
E.7.2 | Therapeutic exploratory (Phase II) | Yes |
E.7.3 | Therapeutic confirmatory (Phase III) | No |
E.7.4 | Therapeutic use (Phase IV) | No |
E.8 Design of the trial |
E.8.1 | Controlled | Yes |
E.8.1.1 | Randomised | Yes |
E.8.1.2 | Open | Yes |
E.8.1.3 | Single blind | No |
E.8.1.4 | Double blind | No |
E.8.1.5 | Parallel group | No |
E.8.1.6 | Cross over | No |
E.8.1.7 | Other | No |
E.8.2 | Comparator of controlled trial |
E.8.2.1 | Other medicinal product(s) | No |
E.8.2.2 | Placebo | No |
E.8.2.3 | Other | Yes |
E.8.2.3.1 | Comparator description |
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E.8.2.4 | Number of treatment arms in the trial | 2 |
E.8.3 |
The trial involves single site in the Member State concerned
| No |
E.8.4 | The trial involves multiple sites in the Member State concerned | Yes |
E.8.4.1 | Number of sites anticipated in Member State concerned | 2 |
E.8.5 | The trial involves multiple Member States | No |
E.8.6 Trial involving sites outside the EEA |
E.8.6.1 | Trial being conducted both within and outside the EEA | No |
E.8.6.2 | Trial being conducted completely outside of the EEA | No |
E.8.7 | Trial has a data monitoring committee | No |
E.8.8 |
Definition of the end of the trial and justification where it is not the last
visit of the last subject undergoing the trial
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The end of the trial will be declared on completion of entry of all clinical data. |
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E.8.9 Initial estimate of the duration of the trial |
E.8.9.1 | In the Member State concerned years | 2 |
E.8.9.1 | In the Member State concerned months | 0 |
E.8.9.1 | In the Member State concerned days | 0 |
E.8.9.2 | In all countries concerned by the trial years | 2 |
E.8.9.2 | In all countries concerned by the trial months | 0 |
E.8.9.2 | In all countries concerned by the trial days | 0 |