| E.1 Medical condition or disease under investigation | 
| E.1.1 | Medical condition(s) being investigated  | 
| Venous thromboembolism, which includes deep vein thrombosis and pulmonary embolism. | 
 
 
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| MedDRA Classification | 
| 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  | 
| To determine whether aspirin is more effective than placebo for the prevention of recurrent symptomatic venous thromboembolism and cardiovascular events when given for at least two years after the initial 6-12 month of oral anticoagulant therapy in patients with idiopathic venous thromboembolism  | 
 
 
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| E.2.2 | Secondary objectives of the trial  |  | 
| E.2.3 | Trial contains a sub-study  |  Information not present in EudraCT  | 
| E.3 | Principal inclusion criteria  | 
Patients will be eligible for inclusion in the study if they meet the following criteria:  
 -First episode of symptomatic, objectively confirmed idiopathic proximal deep vein thrombosis and/or pulmonary embolism;  
 -Initial treatment with unfractionated heparin or low-molecular-weight heparin (or effective alternative) followed by a vitamin K antagonist (target INR 2.0-3.0).  
 All patients will receive 6 or 12 months of oral anticoagulant treatment. Patients initially treated with thrombolytic therapy who received warfarin therapy are eligible for inclusion.    
 | 
 
 
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| E.4 | Principal exclusion criteria | 
Subjects with any of the following will be excluded:   
 -permanent risk factors for venous thromboembolism: patients known to have antiphospholipid antibodies or lupus anticoagulant (based on local laboratory criteria) or to have homozygous factor V Leiden or homozygous prothrombin G21210A or heterozygous factor V Leiden plus heterozygous prothrombin G21210A or antithrombin III deficiency; patients with active malignancy  
 -temporary risk factors for venous thromboembolism 
 -any recurrence of venous thromboembolism or bleeding episode during the established 6-month period of oral anticoagulant treatment 
 -allergy or intolerance of aspirin  
 -clear indication for aspirin or other anti-platelet therapy (e.g. clopidogrel, ticlopidine) 
 -clear indication for long-term anticoagulant therapy (e.g. recurrent idiopathic venous thromboembolism, prosthetic heart valve)-treatment with non-selective COX-1/2 non-steroidal anti-inflammatory drugs 
 -life expectancy less than 6 months 
 -active bleeding or at high risk of bleeding (gastrointestinal bleeding within the past 12 months; endoscopic diagnosis of peptic ulcer disease or ulcerative esophagitis within the past 6 months unless there is documented endoscopic evidence of healing; intracranial bleeding within the past year; known bleeding diathesis) 
 -anticipated non-adherence to study medications  
 -inability to attend follow up because of geographic inaccessibility 
 -failure to provide informed consent 
 | 
 
 
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| E.5 End points | 
| E.5.1 | Primary end point(s) | 
| Incidence of a combined endpoint of cardiovascular events and recurrence of VTE, defined as the sum of confirmed recurrent symptomatic venous thromboembolism, fatal pulmonary embolism, non-fatal myocardial infarction, non-fatal stroke, cardiovascular death and sudden otherwise unexplained death. | 
 
 
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| E.6 and E.7 Scope of the trial | 
| E.6 | Scope of the trial | 
| E.6.1 | Diagnosis |  Yes  | 
| E.6.2 | Prophylaxis |  Yes  | 
| E.6.3 | Therapy |  No  | 
| E.6.4 | Safety |  Yes  | 
| E.6.5 | Efficacy |  Yes  | 
| E.6.6 | Pharmacokinetic |  Yes  | 
| E.6.7 | Pharmacodynamic |  Yes  | 
| E.6.8 | Bioequivalence |  Yes  | 
| E.6.9 | Dose response |  Yes  | 
| E.6.10 | Pharmacogenetic |  Information not present in EudraCT  | 
| E.6.11 | Pharmacogenomic |  Yes  | 
| E.6.12 | Pharmacoeconomic |  Yes  | 
| E.6.13 | Others |  Information not present in EudraCT  | 
| E.7 | Trial type and phase | 
| E.7.1 | Human pharmacology (Phase I) |  Information not present in EudraCT  | 
| E.7.1.1 | First administration to humans |  Information not present in EudraCT  | 
| E.7.1.2 | Bioequivalence study |  Information not present in EudraCT  | 
| E.7.1.3 | Other |  Information not present in EudraCT  | 
| E.7.1.3.1 | Other trial type description |  | 
| E.7.2 | Therapeutic exploratory (Phase II) |  Information not present in EudraCT  | 
| E.7.3 | Therapeutic confirmatory (Phase III) |  Yes  | 
| E.7.4 | Therapeutic use (Phase IV) |  Information not present in EudraCT  | 
| 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 |  Information not present in EudraCT  | 
| E.8.1.4 | Double blind  |  Yes  | 
| E.8.1.5 | Parallel group |  Information not present in EudraCT  | 
| E.8.1.6 | Cross over  |  Information not present in EudraCT  | 
| E.8.1.7 | Other |  Information not present in EudraCT  | 
| E.8.2 |  Comparator of controlled trial | 
| E.8.2.1 | Other medicinal product(s) |  No  | 
| E.8.2.2 | Placebo  |  Yes  | 
| E.8.2.3 | Other |  No  | 
| E.8.3 | 
                                The trial involves single site in the Member State concerned
                             |  Information not present in EudraCT  | 
| E.8.4 |  The trial involves multiple sites in the Member State concerned  |  Information not present in EudraCT  | 
| E.8.5 | The trial involves multiple Member States |  Information not present in EudraCT  | 
| 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 |  Information not present in EudraCT  | 
| E.8.7 | Trial has a data monitoring committee |  Information not present in EudraCT  | 
| 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
                     |  | 
| 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 |  | 
| E.8.9.1 | In the Member State concerned days |  | 
| E.8.9.2 | In all countries concerned by the trial years | 2 |