E.1 Medical condition or disease under investigation |
E.1.1 | Medical condition(s) being investigated |
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E.1.1.1 | Medical condition in easily understood language |
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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 | 20.0 |
E.1.2 | Level | LLT |
E.1.2 | Classification code | 10065337 |
E.1.2 | Term | Focal epilepsy |
E.1.2 | System Organ Class | 100000004852 |
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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 objective of this study is to characterize the dose-response relationship with respect to efficacy of Padsevonil (PSL) administered concomitantly with up to 3 antiepileptic drugs (AEDs) for treatment of observable focal-onset seizures in subjects with drug-resistant epilepsy and to evaluate the efficacy of the 4 selected dose regimens of PSL compared with placebo.
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E.2.2 | Secondary objectives of the trial |
The secondary objective is to assess the safety and tolerability of all doses of Padsevonil (PSL) in relation to placebo.
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E.2.3 | Trial contains a sub-study | Yes |
E.2.3.1 | Full title, date and version of each sub-study and their related objectives |
During this study, subjects will have the option of providing additional informed consent for exploratory deoxyribonucleic acid (DNA) ribonucleic acid (RNA), and lipidomics/proteomics/additional blood biomarker analyses . Participation in this additional portion of the study is optional and does not preclude participation in the main study. The additional pharmacogenetic sample must not be collected if the subject has not consented to participate in this exploratory genetic substudy. A volume of 6 mL of whole blood samples will be collected at Baseline (Visit 2).
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E.3 | Principal inclusion criteria |
- Diagnosis of focal epilepsy per 1989 International League Against Epilepsy (ILAE) criteria at least 3 years before study entry
- Subject has failed to achieve seizure control with 4 tolerated and appropriately chosen prior antiepileptic drugs (AED), including past and ongoing treatment, that were individually optimized for adequate dose and duration. Prior discontinued AED treatment would need to be assessed by the Investigator considering the patient medical records and patient and/or caregiver interview. 'Prior AED' is defined as all past and ongoing AED treatments with a start date before the Screening Visit (Visit 1)
- Average of >= 4 spontaneous and observable focal seizures (type IA1 (i.e. focal aware), IB (i.e. focal impaired awareness), IC (i.e. focal to bilateral tonic-clonic)) per month
- Current treatment with an individually optimized and stable dose of at least 1 and up to 3 AEDs for the 8 weeks prior to the Screening Visit with or without additional Vagus Nerve Stimulation (VNS) or other neurostimulation treatments |
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E.4 | Principal exclusion criteria |
- Subject has a history of or signs for idiopathic generalized (genetic) epilepsy
- Cluster seizures which are uncountable in the previous 8 weeks before study entry and during 4 weeks prospective baseline
- Current treatment with carbamazepine, phenytoin, primidone, phenobarbital
- Current treatment/ use of (non-AED) prescription, nonprescription, dietary (eg, grapefruit or passion fruit), or herbal products that are potent inducers or inhibitors of the CYP3A4 or 2C19 pathway for 2 weeks (or 5 half-lives, whichever is longer) prior to the Baseline Visit
- Subjects taking sensitive substrates of CYP2C19 for 2 weeks (or 5 half-lives, whichever is longer) prior to the Baseline Visit
- Subject has been taking vigabatrin less than 2 years at study entry
- Subject has been taking felbamate for less than 12 months
- Subject taking retigabine for less than 4 years
- Current treatment with benzodiazepines (i.e. GABA-A-ergic drugs like zolpidem, zaleplon, or zopiclone, excluding GABA-A-ergic AEDs) <3 times per week for emergencies.
- Subject has a current medical condition that occurred within the last 12 months which, in the opinion of the investigator, could compromise his/her safety or ability to participate in this study
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E.5 End points |
E.5.1 | Primary end point(s) |
1: 75 % responder rate over the 12 week Maintenance Period
2. Incidence of Treatment-Emergent Adverse Events (TEAEs) reported by
the subject and/or caregiver or observed by the Investigator during the
entire study
3. Incidence of Treatment-Emergent Adverse Events (TEAEs) leading to
study withdrawal
4. Incidence of Treatment-Emergent Serious Adverse Events (SAEs)
during the entire study
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E.5.1.1 | Timepoint(s) of evaluation of this end point |
1: End of Maintenance Period (Week 16) following 3 weeks of titration and 1 week stabilization
2-4: From Baseline until Safety Follow-Up (up to Week 23)
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E.5.2 | Secondary end point(s) |
1. Change in log-transformed observable focal onset seizure frequency from Baseline over the 12 week Maintenance Period
2. 50 % responder rate over the 12 week Maintenance Period
3. Percent change in observable focal-onset seizure frequency from Baseline over the 12 week Maintenance Period
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E.5.2.1 | Timepoint(s) of evaluation of this end point |
1: From Baseline over the 12 week Maintenance Period
2-3: End of Maintenance Period (Week 16) following 3 weeks of titration and 1 week stabilization
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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 | Yes |
E.6.4 | Safety | Yes |
E.6.5 | Efficacy | Yes |
E.6.6 | Pharmacokinetic | Yes |
E.6.7 | Pharmacodynamic | Yes |
E.6.8 | Bioequivalence | No |
E.6.9 | Dose response | Yes |
E.6.10 | Pharmacogenetic | Yes |
E.6.11 | Pharmacogenomic | Yes |
E.6.12 | Pharmacoeconomic | No |
E.6.13 | Others | Yes |
E.6.13.1 | Other scope of the trial description |
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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 | 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 | 5 |
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.8.5 | The trial involves multiple Member States | Yes |
E.8.5.1 | Number of sites anticipated in the EEA | 110 |
E.8.6 Trial involving sites outside the EEA |
E.8.6.1 | Trial being conducted both within and outside the EEA | Yes |
E.8.6.2 | Trial being conducted completely outside of the EEA | No |
E.8.6.3 | If E.8.6.1 or E.8.6.2 are Yes, specify the regions in which trial sites are planned |
Australia |
Belgium |
Bulgaria |
Canada |
Czech Republic |
France |
Germany |
Hungary |
Italy |
Japan |
Lithuania |
Mexico |
Poland |
Portugal |
Slovakia |
Spain |
Turkey |
United Kingdom |
United States |
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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
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Last subject last visit (LSLV)
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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 | 1 |
E.8.9.1 | In the Member State concerned months | 9 |
E.8.9.1 | In the Member State concerned days | |
E.8.9.2 | In all countries concerned by the trial years | 1 |
E.8.9.2 | In all countries concerned by the trial months | 9 |