E.1 Medical condition or disease under investigation |
E.1.1 | Medical condition(s) being investigated |
Duchenne muscular dystrophy |
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E.1.1.1 | Medical condition in easily understood language |
Duchenne muscular dystrophy |
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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 | 20.0 |
E.1.2 | Level | PT |
E.1.2 | Classification code | 10013801 |
E.1.2 | Term | Duchenne muscular dystrophy |
E.1.2 | System Organ Class | 10010331 - Congenital, familial and genetic disorders |
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E.1.3 | Condition being studied is a rare disease | Yes |
E.2 Objective of the trial |
E.2.1 | Main objective of the trial |
To test if tamoxifen treatment, compared to placebo, reduces the progression of the disease in 6.5-12 years old ambulant DMD patients (Group A) by at least 50% (using the MFM D1 subscore as primary clinical endpoint). Furthermore, to test if tamoxifen treatment, compared to placebo, reduces the progression of the disease in 10-16 years old non-ambulant DMD patients (using the MFM D2 subscore as primary endpoint.) The main objective of the OLE part of this study is to test if earlier initiation compared to delayed start of tamoxifen treatment reduces the progression of the disease and to evaluate long-term efficacy and safety. Therefore, disease progression during the OLE phase will be compared between both OLE treatment arms.
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E.2.2 | Secondary objectives of the trial |
Secondary clinical outcomes to assess muscle function:
1. MFM total score, the D2, and D3 MFM subscores, North Star Ambulatory Assessment, proximal upper limb function from baseline to week 48 under TAM treatment compared to placebo.
2. Timed function tests (6 minute walking distance in meter, 10 meter walking time in seconds, time to rise from lying on the floor / supine up in seconds,) from baseline to week 48 under TAM treatment compared to placebo.
Secondary clinical outcomes to assess muscle force:
3. Quantitative muscle testing (using Grip force) from baseline to week 48 under TAM treatment compared to placebo.
Secondary surrogate marker to assess muscle degeneration:
4. Quantitative muscle MRI including muscle fat fraction (MFF) and T2 times of thigh muscles visualised by MRI from baseline to week 48 under TAM treatment compared to placebo.
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E.2.3 | Trial contains a sub-study | No |
E.3 | Principal inclusion criteria |
Group A (ambulant patients) - Documented diagnosis of DMD by mutation analysis in the dystrophin gene or by substantially reduced levels of dystrophin protein (i.e. absent or <5% of normal) on Western blot or immunostaining - Stable treatment with glucocorticoids >6 months (no significant change in dosage (>0.2mg/kg)) at screening; dosing adaptations according to weight change are allowed - Male gender - 6.5 to 12 years of age at time of screening - weight >20kg - ambulant patients - able to walk at least 350 meters in 6 minute walking distance test without assistance at screening - MFM D1 subdomain of the MFM scale >40% at screening - Ability to provide informed consent and to comply with study requirements - Patients harbouring a nonsense mutation treatable with the approved drug ataluren should be under stable ataluren treatment for at least 3 months or in case of nontolerance being off ataluren treatment for at least 3 months before screening Group B (non-ambulant patients) - Documented diagnosis of DMD by mutation analysis in the dystrophin gene or by substantially reduced levels of dystrophin protein (i.e. absent or <5% of normal) on Western blot or immunostaining - Not using glucocorticoids for >6 months - Male gender - Non-ambulant patients (walking distance less than 10 meters) - 10 to 16 years of age at time of screening - Ability to provide informed consent and to comply with study requirements
Open label extension - Recent participation and completion of TAMDMD study
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E.4 | Principal exclusion criteria |
Known individual hypersensitivity or allergy to tamoxifen or other ingredients/excipients of IMP - Female gender - Use of tamoxifen or testosterone within the last 3 months - Known or suspected malignancy - Other chronic disease or clinically relevant limitation of renal, liver or heart function - Known or suspected non-compliance - Any injury which may impact functional testing, e.g. upper or lower limb fracture - Planned or expected spinal fusion surgery during the study period (as judged by the Investigator; i.e. due to rapid progressing scoliosis), previous spinal fusion surgery is allowed if it took place more than 6 months prior to screening. - Inability to follow the procedures of the study, e.g. due to language problems, psychological disorders of the participant/parents (as judged by the investigator) - Concomitant participation in any other interventional trial (and up to 3 months prior to screening) - Use of CYP2D6 inhibitors or of CYP3A4 inducers (apart from glucocorticoids), platelet aggregation inhibitors and coumarin-type anti-coagulants - Use of drugs metabolized by CYP2C9, such as phenprocoumon, phenytoin, warfarin, celecoxib, fluvastatin, ginko biloba, St. John’s wort and sulfamethoxazol - Galactosemia (lack of galactose-1-phosphat-uridylyltransferase or UDP-galactose-4-epimerase or galactokinase; Fanconi-Bickelsyndrome); congenital lack of lactase; glucose-galactose malabsorption - Presence of one or more of the following eye disorders: cataract, retinopathia, optic neuropathy, alteration of the cornea - Presence of one or more of the following laboratory abnormalities: anaemia, thrombocytopenia, leukopenia, neutropenia or agranulocytosis Group A: - Glucocorticoid naïve patients - Start of glucocorticoid treatment or change in dosage <6 month prior to screening (dosing adaptations according to weight change are allowed) Group B: - Glucocorticoid treated patients or patients that stopped glucocorticoid treatment <6 month prior to screening - Assisted ventilation of any kind necessary |
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E.5 End points |
E.5.1 | Primary end point(s) |
Group A: The primary efficacy outcome will be the change of motor function under TAM treatment compared to placebo. This will be assessed by the motor function measure (MFM) D1 subscore (standing and transfers) in ambulant patients.
For the MFM D1 subscore several exercises that will be scored have to be done by the patients such as: - to sit up on a mat (without support of upper limbs), - to stand up from sitting on a mat, - to sit down on the chair from standing, - to walk forward 10 steps on both heels, - to walk forward 10 steps on a straight line, - to run 10 m, - and to hop 10 times on one foot,
Group B: The primary efficacy outcome in this group will be the motor function from baseline to week 48 under TAM treatment compared to placebo. This will be assessed by the motor function measure (MFM) D2 subscore in non-ambulant patients allowing a partial extrapolation and comparison of MFM D2 values between group A and group B. Note that the MFM D1 subscore in non-ambulant patients is usually 0%; therefore the MFM D1 subscore is not suitable for this population. For the MFM D2 subscore several exercises that will be scored have to be done by the patients such as: - from supine on a mat to raise the head and maintain the raised position - from supine on a mat to raise one hand and move it to the opposite shoulder - from seated on the chair to raise the head from fully flexed position and maintain the raised position - from seated on the chair to place the two forearms and/or the hands on the table at the same time without moving the trunk.
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E.5.1.1 | Timepoint(s) of evaluation of this end point |
Screening, Baseline, week 12, week 24, week 36, week 48, week 60 (OLE), week 72 (OLE), week 84 (OLE), week 96 (OLE) |
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E.5.2 | Secondary end point(s) |
Secondary clinical outcomes to assess muscle function: - MFM total score, the D2, and D3 MFM subscores, North Star Ambulatory Assessment from baseline to week 48 under tamoxifen treatment compared to placebo. - Timed function tests (6 minute walking distance in meter, 10 meter walking time in seconds, time to rise from lying on the floor / supine up in seconds,) from baseline to week 48 under tamoxifen treatment compared to placebo. Secondary clinical outcomes to assess muscle force: - Quantitative muscle testing (using Grip force) from baseline to week 48 under tamoxifen treatment compared to placebo. Secondary surrogate marker to assess muscle degeneration: - Quantitative muscle MRI including muscle fat fraction (MFF) and T2 times of thigh muscles visualised by MRI from baseline to week 48 under tamoxifen treatment compared to placebo.
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E.5.2.1 | Timepoint(s) of evaluation of this end point |
MRI: Baseline, week 24, week 48, week 72, week 96 Timed Function test, MFM: Screening, Baseline, week 12, week 24, week 36, week 48, week 60, week 72, week 84, week 96 |
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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 | 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 | 4 |
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 | 2 |
E.8.5 | The trial involves multiple Member States | Yes |
E.8.5.1 | Number of sites anticipated in the EEA | 8 |
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 |
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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 | 1 |
E.8.9.1 | In the Member State concerned months | 8 |
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 |