| E.1 Medical condition or disease under investigation | 
| E.1.1 | Medical condition(s) being investigated  | 
| NF1-related plexiform neurofibroma | 
 
| NF1-relaterade plexiforma neurofibrom | 
 
 
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| E.1.1.1 | Medical condition in easily understood language  | 
Plexiform Neurofibroma (PN). It is a tumour associated with neurofibromatosis type 1 (NF1). | 
 
| Plexiforma neurofibrom (PN). Det är en tumör hos personer med neurofibromatos typ 1 (NF1). | 
 
 
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| E.1.1.2 | Therapeutic area  | Diseases [C] - Congenital, Hereditary, and Neonatal Diseases and Abnormalities [C16] | 
| MedDRA Classification | 
| 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  | 
| Remission of NF1-related plexiform neurofibroma (PN) | 
 
 
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| E.2.2 | Secondary objectives of the trial  | 
Reversal of clinical symptoms of NF1-related PN Exploratory: Evaluate changes in cognitive performance | 
 
 
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| E.2.3 | Trial contains a sub-study  |  No  | 
| E.3 | Principal inclusion criteria  | 
NF1-related PN with severe - or with high suspicion of threatening - manifestations • Informed consent given • Age 1:0-17:11 | 
 
 
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| E.4 | Principal exclusion criteria | 
•	NF1-related PN does not fulfill characteristics for acceptable volumetric MRI assessments as outlined in box Criterion for volumetric assessment. •	Lactating or pregnant or sexual active females, who do not use safe contraception. Sexual active males who do not use condom. •	History of other malignancies than classic NF1-related WHO grade 1 tumor (i.e. PN or optic pathway glioma). •	Subjects with a history of NF-1 related cerebral vascular anomaly (such as Moyamoya). •	Subjects with NF-1, receiving pharmaceutical therapy for optic pathway malignancy/ies. •	Any medication for treatment of left ventricular systolic dysfunction. •	Administration of an investigational study treatment within 30 days preceding the first dose of the study treatment in this study. •	Known immediate or delayed hypersensitivity reaction or idiosyncrasy to drugs chemically related to the study treatment or excipients that contraindicate their participation. •	Current active liver or biliary disease •	History of hepatic sinusoid obstructive syndrome (venoocculsive disease) within the prior 3 months. •	History of heparin-induced thrombocytopenia. •	History of interstitial lung disease or pneumonitis. •	History of or current evidence of retinal vein occlusion (RVO). •	A history of known Hepatitis B Virus (HBV), or Hepatitis C Virus (HCV) infection. Subjects with laboratory evidence of cleared HBV and HCV infection may be enrolled. •	Presence of condition that will interfere significantly with the absorption of drugs. •	Evidence of cardiovascular risk, LVEF below LLN, Qtc >480 millisecond, clinical significant uncontrolled arrhythmia, congestive heart failure, acute coronary syndrome or history thereof. 
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| E.5 End points | 
| E.5.1 | Primary end point(s) | 
| Remission of tumor volume ≥20% evaluated with volumetric MRI | 
 
 
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| E.5.1.1 | Timepoint(s) of evaluation of this end point | 
| month 18 (interim analysis) and month final analysis at month 30. | 
 
 
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| E.5.2 | Secondary end point(s) | 
Reversal of clinical symptoms of NF1-related PN. Evaluated with pain diary, VAS scale or Faces Pain Scale, from month 0 to 30 following. Descriptive. 
 Exploratory: Change of either; full scale IQ or primary indexes (WISC V), Learning and Memory functions and visuospatial functions (selected test from NEPSY II), or attention (Conners CPT3); with p-value <0.05 | 
 
 
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| E.5.2.1 | Timepoint(s) of evaluation of this end point | 
month 18 (interim analysis) and month final analysis at month 30 for pain and after month 18 for cognitive function. | 
 
 
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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 |  No  | 
| E.6.5 | Efficacy |  No  | 
| 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) |  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 |  No  | 
| E.8.1.1 | Randomised |  No  | 
| E.8.1.2 | Open |  Yes  | 
| E.8.1.3 | Single blind |  No  | 
| E.8.1.4 | Double blind  |  No  | 
| E.8.1.5 | Parallel group |  No  | 
| 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  |  No  | 
| E.8.2.3 | Other |  No  | 
| 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 |  No  | 
| 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
                     | 
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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 |  | 
| E.8.9.1 | In the Member State concerned months |  | 
| E.8.9.1 | In the Member State concerned days |  |