| E.1 Medical condition or disease under investigation | 
| E.1.1 | Medical condition(s) being investigated  | 
| Patients with acute ischemic stroke proven by MRI and unknown time from symptom onset which otherwise fulfil the approval criteria for intravenous thrombolysis in acute stroke | 
 
 
 | 
| E.1.1.1 | Medical condition in easily understood language  | 
| Patients with acute ischemic stroke | 
 
 
 | 
| E.1.1.2 | Therapeutic area  | Diseases [C] - Nervous System Diseases [C10] | 
| MedDRA Classification | 
| E.1.2 Medical condition or disease under investigation | 
| E.1.2 | Version  | 17.1 | 
 
| E.1.2 | Level  | PT | 
 
| E.1.2 | Classification code  | 10061256 | 
 
| E.1.2 | Term  | Ischaemic stroke | 
 
| E.1.2 | System Organ Class  | 10029205 - Nervous system disorders | 
 
 
 | 
| 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 objective is to test efficacy and safety of MRI-based intravenous thrombolysis with Alteplase in patients waking up with stroke symptoms or patients with unknown symptom onset. | 
 
 
 | 
| E.2.2 | Secondary objectives of the trial  | 
 | 
| E.2.3 | Trial contains a sub-study  |  No  | 
| E.3 | Principal inclusion criteria  | 
Clinical Inclusion Criteria - Clinical diagnosis of acute ischemic stroke with unknown symptom onset (e.g., stroke symptoms recognized on     awakening) - Last known well (without neurological symptoms) >4.5 hours of treatment initiation - Measurable disabling neurological deficit (defined as an impairment of one or more of the following: language, motor  function, cognition, gaze, vision, neglect) - Age 18-80 years -Treatment can be started within 4.5 hours of symptom recognition (e.g., awakening) - Written informed consent by patient or proxy  
 Imaging Inclusion Criteria: - Acute stroke MRI including diffusion weighted imaging (DWI) and fluid attenuated inversion recovery (FLAIR)  completed and showing a pattern of ?DWI-FLAIR-mismatch?, i.e. acute ischemic lesion visibly on DWI (?positive  DWI?) but no marked parenchymal hyperintensity visible on FLAIR (?negative FLAIR?) indicative of an acute ischemic  lesion ?4.5 hours of age | 
 
 
 | 
| E.4 | Principal exclusion criteria | 
Clinical Exclusion Criteria - Planned or anticipated treatment with endovascular reperfusion strategies (e.g. intra-arterial thrombolysis,  mechanical recanalization techniques) - Pre-stroke disability (inability to carry out all daily activities, requiring some help or supervision, i.e. slight disability  corresponding to an MRS score >1) - Participation in any investigational study in the previous 30 days - Severe stroke by clinical assessment (e.g. NIHSS >25) - Hypersensitivity to Alteplase or any of the excipients - Pregnancy or lactating (formal testing needed in woman of childbearing potential; childbearing potential is assumed in women up to 55 years of age) - Significant bleeding disorder at present or within past 6 months - Known haemorrhagic diathesis - Manifest or recent severe or dangerous bleeding - Known history of or suspected intracranial haemorrhage - Suspected subarachnoid haemorrhage (even if CT is negative) or condition after subarachnoid haemorrhage from  aneurysm - History of CNS damage (e.g. neoplasm, aneurysm, intracranial or spinal surgery) - Recent (within 10 days) traumatic external heart massage, obstetrical delivery, recent puncture of a  non-compressible blood-vessel - Current use of anticoagulants (e.g. Phenprocoumon, Warfarin, new anticoagulants such as Dabigatran) or current  use of heparin and elevated thromboplastin time (low-dose subcutaneous heparin is allowed) - Platelet count <100.000/mm3 (<100G/l) - Blood glucose <50 or >400 mg/dl (<2.8 or 22.2 mmol/l) - Severe uncontrolled hypertension, i.e. systolic blood pressure >185 mmHg or diastolic blood pressure >110 mmHg  or requiring aggressive medication to maintain blood pressure within these limits (routine medical treatment is allowed to lower the blood pressure below these limits) - Manifest or recent bacterial endocarditis, pericarditis - Manifest or recent acute pancreatitis - Documented ulcerative gastrointestinal disease during the last 3 months, oesophageal varices, arterial aneurysm, arterial/venous malformations - Neoplasm with increased bleeding risk - Manifest severe liver disease including hepatic failure, cirrhosis, portal hypertension and active hepatitis - Major surgery or significant trauma in past 3 months - Stroke within 30 days - Life expectancy 6 months or less by judgement of the investigator - Any condition associated with a significantly increased risk of severe bleeding not mentioned above  - Any contraindication to MRI (e.g. cardiac pacemaker) 
 Imaging Exclusion Criteria: - Poor MRI quality precluding interpretation according to the study protocol - Any sign of intracranial haemorrhage on baseline MRI - FLAIR showing a marked parenchymal hyperintensity in a region corresponding to the acute DWI lesion inidicative of  an acute ischemic lesion with a high likelihood of being > 4.5 hours old - Large DWI lesion volume > 1/3 of the MCA or >50% of the anterior cerebral artery (ACA) or posterior cerebral artery (PCA) territory (visual inspection) or >100 ml - Any MRI findings indicative of a high risk of symptomatic intracranial haemorrhage related to potential IV-tPA treatment in the judgement of the investigator | 
 
 
 | 
| E.5 End points | 
| E.5.1 | Primary end point(s) | 
Primary Efficacy Endpoint ?	 ?Favourable outcome? defined by a score of 0-1 on the modified Rankin Scale (MRS) 90 (±10) days after stroke Primary Safety Endpoints ?	Mortality 90( ±)10 days after stroke ?	Death or dependency 90 (±10) days after stroke (MRS 4-6) | 
 
 
 | 
| E.5.1.1 | Timepoint(s) of evaluation of this end point | 
Primary Efficacy Endpoint ?	 90 ±10 days after stroke Primary Safety Endpoints ?	90 ±10 days after stroke ?	90 ±10 days after stroke | 
 
 
 | 
| E.5.2 | Secondary end point(s) | 
Secondary Efficacy Endpoints - Global Outcome Score (combination of MRS 0-1, NIHSS 0-1, Barthel Index [BI] 95-100, Glasgow Outcome Scale [GOS] 1) 90 (±10) days after stroke - Categorical shift in MRS 90 (±10) days after stroke  - Responder analysis relating MRS 90 (±10) days after stroke to baseline NIHSS score: ?response? defined by NIHSS  <7 = MRS 0; NIHSS 8-14 = MRS 0-1; NIHSS >14 = MRS 0-2 - Infarct volume after 22-36 hours - Depressive symptoms 90 (±10) days after stroke (Beck Depression Inventory [BDI]) - Functional health status and quality of life 90 (±10) days after stroke (EQ-5D) - Use of health care system resources - 90 +/- 10 days after stroke 
 Secondary Safety Endpoints - Symptomatic intracranial haemorrhage (SICH) as defined in SITS-MOST  - SICH as defined ECASS II  - SICH as defined in NINDS - Parenchymal haemorrhage type 2 (PH-2) - 22-36 hours after treatment | 
 
 
 | 
| E.5.2.1 | Timepoint(s) of evaluation of this end point | 
| 90 (±10) days after stroke | 
 
 
 | 
| 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 |  Yes  | 
| 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) |  No  | 
| E.7.3 | Therapeutic confirmatory (Phase III) |  Yes  | 
| 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 |  No  | 
| E.8.1.3 | Single blind |  No  | 
| E.8.1.4 | Double blind  |  Yes  | 
| E.8.1.5 | Parallel group |  Yes  | 
| 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  |  Yes  | 
| E.8.2.3 | Other |  No  | 
| 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 | 10 | 
| E.8.5 | The trial involves multiple Member States |  Yes  | 
| E.8.5.1 | Number of sites anticipated in the EEA | 50 | 
| 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 |  Yes  | 
| 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 | 4 | 
| 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 | 4 | 
| 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 |