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 |
Dup15q Syndrome is a neurodevelopmental disorder, caused by the partial duplication of Chromosome 15, that confers a strong risk for autism spectrum disorder, epilepsy, and intellectual disability. |
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E.1.1.2 | Therapeutic area | Diseases [C] - Congenital, Hereditary, and Neonatal Diseases and Abnormalities [C16] |
MedDRA Classification |
E.1.2 Medical condition or disease under investigation |
E.1.2 | Version | 23.0 |
E.1.2 | Level | LLT |
E.1.2 | Classification code | 10083952 |
E.1.2 | Term | Dup15q syndrome |
E.1.2 | System Organ Class | 100000004850 |
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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 |
To evaluate the effects of 52 weeks of treatment with basmisanil on core symptom domains of Dup15q syndrome (language and social skills) and daily functioning (Part 1). |
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E.2.2 | Secondary objectives of the trial |
• To evaluate the effects of 52 weeks of treatment with basmisanil treatment on Motor function, Cognition, Language, Social skills, Clinical global impression of severity and change, Challenging behaviors (Part 1) • To evaluate the tolerability and safety of 52 weeks of treatment with basmisanil (Part 1) • To characterize the PK of basmisanil and its metabolite M1 and determine the dose that will deliver target exposure in study participants (Part 1) • To evaluate potential relationships between selected covariates and exposure to basmisanil (Part 1) • To evaluate the effects of basmisanil treatment on the characteristic Dup15q EEG phenotype acutely and at steady state (Part 1). |
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E.2.3 | Trial contains a sub-study | No |
E.3 | Principal inclusion criteria |
• Participants aged 2 to 14 years inclusive at the time the caregiver signs the informed consent • Documented maternal duplication (3 copies) or triplication (4 copies) of the chromosome 15q11.2-q13.1 region that includes the Prader-Willi/Angelman critical region defined as [BP2-BP3] segment • Dup15q syndrome Clinician Global Impression of Severity scale (Dup15q CGI-S) overall severity score ≥ 4 (at least moderately ill) • Stage 1 specific inclusion criterion: Participants aged 6 to 14 years with epilepsy • Body weight equal to or above the third percentile for age • Male and female participants: Some of the provisions that follow may have limited applicability based on the age range of study participants (i.e., up to the age of 14) and the nature of the disease under study • Female Participants: A female participant is eligible to participate if she is not pregnant, not breastfeeding • Male Participants: Male contraception is not required in this study because of the minimal seminal dose transmitted through sexual intercourse • The participant has a parent, caregiver, or legally authorized representative (hereinafter “caregiver”) of at least 18 years of age, who is fluent in the local language at the site, and capable and willing to provide written informed consent for the participant according to International Council for Harmonisation and local regulations • The participant’s caregiver must be living with the participant and, in the opinion of the Investigator, able and willing to reliably assess the participant’s ongoing condition, to accompany the participant to all clinic visits, and ensure compliance to study treatment throughout the study. The same caregiver is able and willing to complete the caregiver assessments and is available to the Investigational Site by telephone or email if needed • The participant’s caregiver is able and willing to use electronic devices to record information on the participant’s condition and to complete assessments at home and agrees to home nursing visits, if local regulations allow for it and if home nursing service is available in the country/region. |
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E.4 | Principal exclusion criteria |
• Uncontrolled epilepsy at screening as indicated by: Use of rescue medication(s) to treat more than one seizure episode or seizure cluster per month on average in the past 6 months or concomitant chronic use of more than 4 anti-epileptic medications or status epilepticus within the past 6 months requiring hospitalization for treatment of the status epilepticus, or any implanted devices to treat drug-resistant epilepsy • Lymphoma, leukemia, or any malignancy within the past 5 years, except for basal cell or squamous epithelial carcinomas of the skin that have been resected with no evidence of metastatic disease for 3 years • Clinically significant ECG abnormalities at Screening, including an average triplicate QTcF > 450 ms for participants > 10 years or QTcB > 450 ms for children up to and including age 10 years • Clinically significant abnormalities in laboratory test results at screening (including positive results for HIV, hepatitis B and/or hepatitis C). ALT values > 1.5 × the upper limit of normal. GFR < 90 mL/min per 1.73 m2 (Grade 1 CKD) as estimated using Schwarz formula. • Allowed prior existing medication should be on a stable regimen (or frequency of intervention) for at least 6 weeks, and at least 8 weeks for anti-epileptic treatment, prior to screening • Non-pharmacological / behavioral therapies should not be stopped or newly started at least 6 weeks prior to screening and are expected to remain stable for the entire study duration (excluding changes related to standard age and educational interventional programs and minor interruptions such as illness or vacation • Concomitant use of prohibited medications • Participation in an investigational drug study within one month or within 6 × the elimination half-life, whichever is longer, prior to dosing in the study • Significant risk for suicidal behavior, as assessed through the suicidal behavior question adapted from the Columbia Classification Algorithm for Suicide Assessment (C-CASA) (participants ≥ 6 years of age only) • Known sensitivity to any of the study treatments or components thereof, or drug or other allergy that, in the opinion of the Investigator, contraindicates the participation in the study, including severe lactose intolerance • Concomitant clinically relevant disease or condition or any clinically significant finding at screening that could interfere with, or for which, the treatment might interfere with, the conduct of the study or that would pose an unacceptable risk to the participants in this study • Known active or uncontrolled bacterial, viral, or other infection or any major clinically significant episode of infection or hospitalization (relating to the completion of the course of antibiotics) within 6 weeks prior to the start of drug administration. |
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E.5 End points |
E.5.1 | Primary end point(s) |
1. Vineland Adaptive Behavior Scale–Third Edition (Vineland-3): Adaptive Behavior Composite. |
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E.5.1.1 | Timepoint(s) of evaluation of this end point |
1. Baseline, Day 183, Day 365. |
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E.5.2 | Secondary end point(s) |
1. Vineland-3: gross and fine motor, expressive and receptive communication language, play and leisure time and interpersonal relationships subdomains 2. Mullen Scales of Early Learning (MSEL): gross and fine motor domains, visual reception domain, expressive and receptive language subdomains 3. Dup15q syndrome Clinical Global Impression Severity scale (Dup15q CGI-S) 4. Dup15q syndrome Clinical Global Impression Change scale (Dup15q CGI-C) 5. Aberrant Behavior Checklist - Second Edition – Community Version (ABC-2-C) domain scores 6. Incidence, nature, and severity of AEs and SAEs 7. Incidence of treatment discontinuations due to AEs 8. Incidence of laboratory abnormalities based on hematology, clinical chemistry, and urinalysis test results 9. ECG changes from baseline; incidence of abnormal ECG assessments 10. Change from baseline in all seizure frequency, duration, and type of seizure as reported in a seizure diary by caregivers 11. Abnormal changes in EEG recordings compared to baseline with a focus on treatment-emergent epileptiform abnormalities 12. Systolic and diastolic blood pressure and heart rate measurements 13. Suicidality as assessed through questions from selected items adapted from the Columbia Classification Algorithm for Suicide (C-CASA) in participants aged 6 years and above 14. Height, weight, head circumference 15. Tanner staging over time (in participants aged 9 years and above) 16. Plasma concentration of basmisanil and its major metabolite M1 at specified timepoints 17. Plasma concentration ratio of M1 to basmisanil at trough 18. qEEG beta-band power. |
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E.5.2.1 | Timepoint(s) of evaluation of this end point |
1-2. Baseline, Day 183, Day 365 3. Screening, Baseline, Day 28, Day 92, Day 183, Day 274, Day 365, Follow-up visit (Day 395) 4. Day 28, Day 92, Day 183, Day 274, Day 365, Follow-up visit (Day 395) 5. Baseline, Day 28, Day 92, Day 183, Day 274, Day 365 6-8. Up to Follow-up visit (Day 395) 9. Screening, Baseline, Day 1, Day 2, Day 14, Day 183, Day 365 10. Baseline, Day 28, Day 92, Day 183, Day 274, Day 365, Follow-up visit (Day 395) 11. Baseline, Day 1, Day 2, Day 14, Day 183, Day 365 12-13. Up to Follow-up visit (Day 395) 14. Screening, Baseline, Day 183, Day 365 15. Baseline, Day 365 16-17. Day 1, Day 2, Day 14, Day 92, Day 183, Day 274, Day 365 18. Baseline, Day 1, Day 2, Day 14, Day 183, Day 365. |
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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 | Yes |
E.6.7 | Pharmacodynamic | Yes |
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 | 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 | 1 |
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 | 1 |
E.8.5 | The trial involves multiple Member States | Yes |
E.8.5.1 | Number of sites anticipated in the EEA | 15 |
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 |
Russian Federation |
United Kingdom |
Italy |
Netherlands |
Poland |
Portugal |
Spain |
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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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A participant is considered to have completed the study if he/she has completed all phases of the study, including the last scheduled procedure per SoA or withdrawal of consent. The end of the study is defined as the date when the last participant’s last observation occurs. |
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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 | 3 |
E.8.9.1 | In the Member State concerned months | 1 |
E.8.9.1 | In the Member State concerned days | |
E.8.9.2 | In all countries concerned by the trial years | 3 |
E.8.9.2 | In all countries concerned by the trial months | 1 |