| E.1 Medical condition or disease under investigation | 
| E.1.1 | Medical condition(s) being investigated  | 
| Epilepsy with partial onset seizures | 
 
 
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| E.1.1.1 | Medical condition in easily understood language  | 
| Epilepsy with partial onset seizures | 
 
 
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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  | PT | 
 
| E.1.2 | Classification code  | 10015037 | 
 
| E.1.2 | Term  | Epilepsy | 
 
| E.1.2 | System Organ Class  | 10029205 - Nervous 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 objective of this study is to evaluate the efficacy of LCM administered concomitantly with 1 to 3 AEDs in subjects ≥1 month to <4 years of age with epilepsy who currently have uncontrolled partial-onset seizures. | 
 
 
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| E.2.2 | Secondary objectives of the trial  | 
| The secondary objective is to evaluate the safety and tolerability of LCM in subjects ≥1 month to <4 years of age with epilepsy who currently have uncontrolled partial-onset seizures. | 
 
 
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| E.2.3 | Trial contains a sub-study  |  No  | 
| E.3 | Principal inclusion criteria  | 
Subject is male or female from ≥1 month (ie, 4 weeks after full term [37 weeks gestational age]) to <4 years of age. • Subject has a diagnosis of epilepsy with partial-onset seizures. The results of ≥1 prior EEG and ≥1 magnetic resonance imaging/computerized tomography scan should be consistent with this diagnosis. • Subject weighs ≥4kg to <30kg at Visit 1. • Subject has experienced ≥2 partial-onset seizures with or without secondary generalization during each consecutive 7-day period during the 2 weeks prior to Visit 1. • Subject has ≥2 partial-onset seizures with or without secondary generalization during the End-of-Baseline video-EEG.  Electrographic seizures are defined as recognizable ictal patterns on an EEG involving ≥2 contiguous electrodes. The seizures are initiated as a unilateral or strongly asymmetric abnormal epileptiform discharge lasting a total of >10 seconds.  • Subject is on a stable (concurrently or sequentially) dosage regimen of 1 to 3 AEDs. The dosage regimen of concomitant AED therapy must be kept constant for a period of ≥2 weeks prior to Visit 1. A stable daily dosage regimen of a concomitant benzodiazepine (BZD) will be considered as a concomitant AED. • Vagus nerve stimulation is allowed and will not be counted as a concomitant AED. The VNS device must have been implanted for ≥6 months prior to Visit 1; device settings must be kept stable for ≥2 weeks prior to Visit 1 and kept stable during the Baseline, Treatment, and Transition Periods. Use of the VNS device magnet is allowed. • Subject is an acceptable candidate for venipuncture | 
 
 
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| E.4 | Principal exclusion criteria | 
• Subject has experienced febrile seizures exclusively. The occurrence of febrile seizures in addition to partial-onset seizures is not exclusionary. • Subject is on a ketogenic diet that has either changed within the 4 weeks prior to Visit 1 or is expected to change during the study. • Subject has creatinine clearance <30mL/minute. • Subject has a clinically relevant ECG abnormality, in the opinion of the investigator (eg, second or third degree heart block at rest or a corrected QT interval [QTc] ≥450ms). • Subject has a hemodynamically significant congenital heart disease. • Subject has an arrhythmic heart condition requiring medical therapy. • Subject has a known history of severe anaphylactic reaction secondary to medication intake or serious blood dyscrasias. • Subject has nonepileptic events that could be confused with seizures. Subjects may be included if epileptic events can be clearly distinguished and the frequency meets the study inclusion criteria. • Subject has a current diagnosis of Lennox-Gastaut syndrome, epilepsia partialis continua, primary generalized epilepsy, Dravet Syndrome, or seizures that are not of partial-onset origin. • Subject has a history of status epilepticus ≤2 months prior to Screening (Visit 1). • Subject has been treated with felbamate and has experienced any serious toxicity issues (defined as liver failure, aplastic anemia) with this treatment. Subjects treated with felbamate for <12 months are excluded. Subjects treated with felbamate for ≥12 months prior to Visit 1 and who have not experienced serious toxicity issues are eligible. • Subject has an acute or subacutely progressive central nervous system disease. Subject has epilepsy secondary to a progressing cerebral disease or any other progressively neurodegenerative disease (malignant brain tumor or Rasmussen Syndrome). • Subject has a known sodium channelopathy, such as Brugada syndrome. | 
 
 
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| E.5 End points | 
| E.5.1 | Primary end point(s) | 
1) The primary efficacy variable will be the proportion of responders where a responder is a subject experiencing a 50% or greater reduction in their ADF of electrographic partial-onset seizures recorded on the End-of-Maintenance Period video-EEG compared to the End-of-Baseline Period video-EEG. 2) Adverse events reported spontaneously by the subject’s parent(s) and/or legal representative(s)/caregiver(s) (in accordance with local regulation) or observed by the investigator 3) Subject withdrawals due to AEs | 
 
 
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| E.5.1.1 | Timepoint(s) of evaluation of this end point | 
1) From End-of-Baseline Period to End-of-Maintenance Period 2) From Baseline to End-of-Maintenance Period 3) From Titration Period (day 1) to End of Study Visit (up to 93 days) | 
 
 
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| E.5.2 | Secondary end point(s) | 
1) Absolute change in ADF of electrographic partial-onset seizures from the End-of-Baseline Period video-EEG to the End-of-Maintenance Period video-EEG 2) Percent change in ADF of electrographic partial-onset seizures from the End-of-Baseline Period video-EEG to the End-of-Maintenance Period video-EEG 3) Proportion of subjects who achieved “seizure-free” status (yes/no) from all seizure types for subjects who completed at least 48 hours of interpretable video-EEG recording during the End-of-Maintenance Period video-EEG 4) Proportion of subjects who achieved “seizure-free” status (yes/no) from  partial-onset seizure types only for subjects who completed at least 48 hours of interpretable video-EEG recording during the End-of-Maintenance Period video-EEG 5) Proportion of subjects experiencing a ≥25% to <50% reduction in ADF of electrographic partial-onset seizures from the end-of-Baseline Period video-EEG to the End-of-Maintenance Period video-EEG 6) Proportion of subjects experiencing 50% to 75% reduction in ADF of electrographic partial-onset seizures from the end-of-Baseline Period video-EEG to the End-of-Maintenance Period video-EEG 7) Proportion of subjects experiencing >75% reduction in ADF of electrographic partial-onset seizures from the end-of-Baseline Period video-EEG to the End-of-Maintenance Period video-EEG 8) Proportion of subjects experiencing no change in ADF of electrographic partial-onset seizures (between <25% reduction and <25% increase) from the End-of-Baseline Period video-EEG to the End-of-Maintenance Period video-EEG 9) Proportion of subjects experiencing an increase in ADF of electrographic partial-onset seizures of ≥25% from the End-of-Baseline Period video-EEG to the End-of-Maintenance Period video-EEG | 
 
 
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| E.5.2.1 | Timepoint(s) of evaluation of this end point | 
1) From the end-of-Baseline Period video-EEG to the End-of-Maintenance Period video-EEG 2) From the end-of-Baseline Period video-EEG to the End-of-Maintenance Period video-EEG 3) During the End-of-Maintenance Period video-EEG  4) During the End-of-Maintenance Period video-EEG  5) From the end-of-Baseline Period video-EEG to the End-of-Maintenance Period video-EEG 6) From the end-of-Baseline Period video-EEG to the End-of-Maintenance Period video-EEG 7) From the end-of-Baseline Period video-EEG to the End-of-Maintenance Period video-EEG 8) From the end-of-Baseline Period video-EEG to the End-of-Maintenance Period video-EEG 9) From the end-of-Baseline Period video-EEG to the End-of-Maintenance Period video-EEG | 
 
 
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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 |  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 |  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) |  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
                             |  Yes  | 
| E.8.4 |  The trial involves multiple sites in the Member State concerned  |  No  | 
| 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 |  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 | 
| Argentina | 
 
| Australia | 
 
| Belgium | 
 
| Brazil | 
 
| Bulgaria | 
 
| China | 
 
| Colombia | 
 
| Croatia | 
 
| Czech Republic | 
 
| Denmark | 
 
| Finland | 
 
| France | 
 
| Georgia | 
 
| Germany | 
 
| Greece | 
 
| Hungary | 
 
| Israel | 
 
| Italy | 
 
| Korea, Republic of | 
 
| Lithuania | 
 
| Mexico | 
 
| Moldova, Republic of | 
 
| Philippines | 
 
| Poland | 
 
| Portugal | 
 
| Romania | 
 
| Russian Federation | 
 
| Serbia | 
 
| Slovakia | 
 
| Spain | 
 
| Taiwan | 
 
| Thailand | 
 
| Turkey | 
 
| Ukraine | 
 
| 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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| E.8.9 Initial estimate of the duration of the trial | 
| E.8.9.1 | In the Member State concerned years | 0 | 
| E.8.9.1 | In the Member State concerned months | 9 | 
| E.8.9.1 | In the Member State concerned days | 25 | 
| E.8.9.2 | In all countries concerned by the trial years | 5 | 
| 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 |