Phase III Trial Assessing the Efficacy and Safety of PXT3003 in CMT1A Patients (NCT04762758) | Clinical Trial Compass
UnknownPhase 3
Phase III Trial Assessing the Efficacy and Safety of PXT3003 in CMT1A Patients
United States350 participantsStarted 2021-03-30
Plain-language summary
The study will consist of 2 periods: Double-blind Treatment and Open-Label Extension(OLE) Period.
-Double-blind Treatment Period - This will be randomized, double-blind, placebo-controlled part of the study which will be conducted in parallel groups, ie,1 group receiving the active treatment (PXT3003) and the other group receiving placebo.
Primary endpoint of the study will be assessed at Month 15.
-Open-label Extension (OLE) Period - All subjects completing Double-blind Treatment Period will be given an opportunity to enter the OLE Period of the study and receive the active treatment (PXT3003). The duration of the OLE Period will be based on Sponsor discretion, ie, Sponsor intends to keep the study open until the study drug PXT3003 is commercially available.
During this period, the long-term safety and efficacy of PXT3003 will be assessed as an exploratory objective.
Double-blind Treatment Period Objectives:
Primary:
To evaluate the efficacy of treatment with PXT3003 (a fixed-dose combination of \[RS\]-baclofen, naltrexone hydrochloride \[HCl\], and D-sorbitol) compared to placebo in subjects with Charcot-Marie-Tooth disease type 1A (CMT1A).
Secondary:
To evaluate the safety and tolerability of PXT3003 treatment in subjects with CMT1A.
Exploratory:
To characterize the relationship between plasma biomarkers and response to PXT3003 treatment.
OLE Period Objective:
Exploratory:
To evaluate the long-term safety and efficacy of PXT3003.
Who can participate
Age range16 Years – 65 Years
SexALL
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Inclusion criteria
✓. Male and non-pregnant female subjects, aged 16 to 65 years with a genetically proven diagnosis of CMT1A. Notes: a) A report of a genetic test confirming PMP22 duplication and therefore a diagnosis of CMT1A must be available in the subject's record at the clinical site. b) In the absence of a report of a genetic test confirming PMP22 duplication in the subject's medical record, a confirmatory genetic test must be conducted via the central laboratory as part of Screening. c) In the exceptional case wherein subject was randomized into the study without meeting(a) or (b), an unscheduled confirmatory genetic test will be performed. In the event of a negative genetic test result, the subject will be withdrawn from the study.
✓. Able to provide written informed consent/assent and comply with study procedures.
✓. Mild-to-moderate severity assessed by a CMTNS-V2 score \>2 and ≤18.
✓. Muscle weakness in at least foot dorsiflexion on clinical assessment.
✓. Ulnar nerve motor conduction time of at least 15 m/s.
✓. If taking prescribed psychoactive drugs(eg, antidepressants, stimulants, tranquilizers, anti-epileptics) for CMT1A, should be on a stable dose for at least 4 weeks prior to randomization, which is not planned to be changed.
✓. If taking prescribed or 'over-the-counter' analgesic medications (eg, paracetamol/acetaminophen, nonsteroidal anti-inflammatory drugs) for CMT1A, should be on a stable dose for at least 2 weeks prior to randomization, which is not planned to be changed.
✓. If female, subject must be: (a) surgically sterilized via hysterectomy, bilateral oophorectomy, or bilateral tubal ligation; or (b) of childbearing potential and using a birth control method such as:
Exclusion criteria
✕. Subjects previously enrolled in any PXT3003 study.
✕. Subjects living in the same household and enrolled in a PXT3003 study (due to potential lack of adequate storage for study material, risk of mixing treatments and potential unblinding).
✕. CMT of any subtype other than 1A.
✕. ONLS score of 0.
✕. Known clinically significant motor or sensory abnormalities secondary to a different neurological cause (eg, diabetes, alcohol, vascular, autoimmune, neoplastic, neurodegenerative, human immunodeficiency virus, etc.). Note: subjects with diagnosis of unilateral carpal tunnel syndrome at least 1 year prior to Screening Visit, that is asymptomatic at the time of Screening Visit, will not be excluded from participating in this study.
✕. Subjects who have had any surgery or have a concomitant disorder (eg, severe arthrosis) that reduces the mobility of the ankle or wrist making it, in the opinion of the investigator, difficult to assess the efficacy of the treatment. Note: subjects with surgical repair of unilateral carpel tunnel syndrome will not be excluded from participating in this study.
✕. Known peripheral neuropathy, myopathy, or neuromuscular disorder of any other kind. Note: subjects with diagnosis of unilateral carpal tunnel syndrome at least 1year prior to Screening Visit, that is asymptomatic at the time of Screening Visit, will not be excluded from participating in this study.
✕. Any other clinically significant and/or uncontrolled medical condition that, in the opinion of the investigator, could be a confound, may increase subject's risk, or may preclude successful participation or completion of the study.