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Safety and Biomarker Study of PTC-589 in Participants With Parkinson's Disease

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
ClinicalTrials.gov Identifier: NCT02462603
Recruitment Status : Completed
First Posted : June 4, 2015
Results First Posted : May 3, 2022
Last Update Posted : May 3, 2022
Information provided by (Responsible Party):
Edison Pharmaceuticals Inc

Brief Summary:
Open-label study with 30-day run-in phase and adaptive design component to include more participants if deemed appropriate by investigators.

Condition or disease Intervention/treatment Phase
Parkinson's Disease Drug: PTC-589 Phase 2

Detailed Description:
This is a within-subject, controlled open-label study seeking to determine if PTC-589 can alter the biochemical signature of Parkinson's disease as assessed by peripheral blood biomarkers, central nervous system (CNS) biomarkers, and urine biomarker analysis. In addition, data on a number of disease-relevant clinical measures will be collected.

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 44 participants
Allocation: N/A
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: A Phase 2A Safety and Biomarker Study of EPI-589 in Mitochondrial Subtype and Idiopathic Parkinson's Disease Subjects
Actual Study Start Date : May 17, 2016
Actual Primary Completion Date : January 8, 2019
Actual Study Completion Date : January 8, 2019

Resource links provided by the National Library of Medicine

Arm Intervention/treatment
Experimental: PTC589
Participants with Parkinson's disease (idiopathic and mitochondrial genetic subtype participants) will receive PTC589 at a dose of 500 milligrams (mg) (2 tablets of 250 mg each) orally twice daily (BID) for up to 3 months unless discontinued for safety or tolerability issues.
Drug: PTC-589
PTC-589 is a redox active molecule and will be provided in a 250 mg tablet formulation.
Other Name: (R)-Troloxamide quinone

Primary Outcome Measures :
  1. Number of Participants With Drug-Related Serious Adverse Events (SAEs) [ Time Frame: Baseline up to 30 days after last dose of study drug (up to 4 months) ]
    An adverse event (AE) was any untoward medical occurrence in a participant who received study drug without regard to possibility of causal relationship. Serious adverse event (SAE) was an AE resulting in any of the following outcomes or deemed significant for any other reason: death; initial or prolonged inpatient hospitalization; life-threatening experience (immediate risk of dying); persistent or significant disability/incapacity; congenital anomaly. A summary of other non-serious AEs and all SAEs, regardless of causality is located in the 'Reported AE section'.

Secondary Outcome Measures :
  1. Change From Baseline in Movement Disorder Society Sponsored Revision of the Unified Parkinson's Disease Rating Scale (MDS-UPDRS) Score at Month 3 [ Time Frame: Baseline, Month 3 ]
    The MDS-UPDRS is a tool for monitoring the impact of Parkinson's disease, the degree of disability caused, and complications from treatment. Part I (13 items) evaluates nonmotor experiences of daily living (nM-EDL); Part II (13 items) evaluates motor experiences of daily living (M-EDL; Part III (18 items) is a motor examination; Part IV (6 items) examines motor complications (for example, motor fluctuations and dyskinesias). Each item was rated on a 5-point scale, ranging from 0 (normal) to 4 (severe), with higher score indicating greater severity and more impairment. Total score for Part I (nM-EDL) and Part II (M-EDL) each ranges from 0-52; for Part III (motor examination) ranges from 0-72; and for Part IV (motor complications) ranges from 0-24; with higher scores in each range for all 4 parts reflecting greater severity.

  2. Change From Baseline in Non-motor Symptoms Scale (NMSS) Total Score at Month 3 [ Time Frame: Baseline, Month 3 ]
    Non-motor symptoms were evaluated using the NMSS which was divided into 30 questions in 9 different domains including such symptoms as dribbling saliva, constipation, depression, sleep disorders, apathy, hallucinations and dementia. Symptoms were quantified based on their severity (using a scale of 0 [none] to 3 [severe]) and frequency (using a scale of 0 [rarely] to 4 [very frequent]). Total score derived from adding up the product of the frequency score times severity score for each of the 30 questions. Total score ranged from 0 to 360, with a lower score indicating fewer symptoms.

  3. Change From Baseline in Parkinson's Disease Questionnaire - 39 (PDQ-39) Score at Month 3 [ Time Frame: Baseline, Month 3 ]
    The PDQ-39 is a self-administered questionnaire for participants with Parkinson's disease that has 39 questions grouped in 8 dimensions: mobility (items 1-10), activities of daily living (items 11-16), emotional well-being (items 17-22), stigma (items 23-26), social support (items 27-29), cognitions (items 30-33), communication (items 34-36), and bodily discomfort (items 37-39). Each item was scored on a 5-point Likert scale (0 to 4) to indicate the frequency of each event; 0 = never, 1 = occasionally, 2 = sometimes, 3 = often, and 4 = always or cannot do at all. Each dimension's total score ranged from 0-100, with lower scores indicating better health, and higher scores indicating more severe symptoms.

  4. Change From Baseline in EuroQol-5 Dimension (EQ-5D) Score at Month 3 [ Time Frame: Baseline, Month 3 ]
    EQ-5D is a questionnaire designed to provide measures of health-related quality of life states, consisting of 5 domains (mobility, self-care, usual activities, pain/discomfort, and anxiety/depression). Each dimension has a 3 point response scale designed to indicate the level of the problem: 1 = no problems, 2 = some problems, 3 = extreme problems. A higher score indicated an increase in the level of problem. The EQ-5D also contains a visual analog scale (EQ-VAS), which records the respondent's self-rated health status on a vertical graduated visual analog scale ranging from 0 (worst imaginable health state) to 100 (best imaginable health state). Higher score indicated improvement.

  5. Montreal Cognitive Assessment (MoCA) Score [ Time Frame: Month 3 ]
    MoCA is a 30-point questionnaire for cognitive dysfunction. It assesses different cognitive domains: attention and concentration, executive functions, memory, language, visuoconstructional skills, conceptual thinking, calculations, and orientation. Scores on the MoCA range from 0-30 with 26-30 indicating normal global cognition; 18-25 mild cognitive impairment; 10-17 moderate cognitive impairment; and <10 severe cognitive impairment.

  6. Beck Depression Inventory (BDI) Score [ Time Frame: Month 3 ]
    The BDI is a self-reporting 21-item scoring tool that measures characteristic attitudes and symptoms of depression, including physical symptoms. Each of the 21 items on BDI tool represent a depressive symptom. The symptoms are each scored on a 4-point Likert scale of 0 (symptom is absent) to 3 (symptom is severe). Scores for each symptom are added up to obtain the total scores for all 21 items, which are interpreted as follows 1-10 (normal); 11-16 (mild mood disturbance); 17-20 (borderline clinical depression); 21-30 (moderate depression); 31-40 (severe depression); and >40 (extreme depression). Participants with symptom score of 0 were not included in the summary.

  7. Change From Baseline in Montgomery and Asberg Depression Rating Scale (MADRS) Total Score at Month 3 [ Time Frame: Baseline, Month 3 ]
    The MADRS is a clinician-rated tool for measuring changes in depressive symptom severity. Ten core symptoms and cognitive features (feelings of sadness, lassitude, pessimism, inner tension, suicidality, reduced sleep or appetite, difficulty concentrating, and a lack of interest) were rated on a severity scale of 0 (no symptoms)) to 6 (symptoms of maximum severity). The total score was the sum of the scores on the 10 items, ranging from 0 to 60 with a higher score indicating increasing depressive symptoms.

  8. Change From Baseline in Time to Complete Time Up and Go (TUG) Test in ON State at Month 3 [ Time Frame: Baseline, Month 3 ]
    Timed motor tests are simple, objective, quantitative measures for the assessment of Parkinson's disease. They include, in on-medication and off-medication state, timed recorded physical movements. Time Up and Go Test (TUG) is one of timed motor tests which is used to assess a person's mobility and requires both static and dynamic balance. This is a walking assessment. Participants start in the seated position, stand up, walk 7 meters, turn around, and sit back down. The entire process from leaving the chair to returning to the chair was timed. The total time was summarized under ON state with participants on dopamine therapy.

  9. Maximum Observed Plasma Concentration (Cmax) of PTC589 [ Time Frame: 0 hour (predose) and 0.5, 1, 2, 4, 6, 8, and 12 hours postdose at Month 1 and 3 ]
  10. Level of Disease-Related Biomarker (Glutathione) in Plasma [ Time Frame: Month 3 ]
    Glutathione lowest limit of quantification (LLOQ) = 0.01 micromoles (uM) and upper limit of quantification (ULOQ) = 27.83 uM in plasma.

  11. Level of Disease-Related Biomarker (Glutathione) in Cerebrospinal Fluid (CSF) [ Time Frame: Month 3 ]
    Glutathione LLOQ = 0.002 uM and ULOQ = 0.35 uM in CSF.

  12. Level of Disease-Related Biomarker (Glutathione) in Urine [ Time Frame: Month 3 ]
    Glutathione LLOQ = 0.01 uM, and ULOQ = 1.39 uM in urine.

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

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Ages Eligible for Study:   21 Years to 75 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Hoehn and Yahr stage ≤3.0
  • Ambulatory with or without assistance
  • Sexually active fertile participants and their partners must agree to use medically accepted methods of contraception (such as, hormonal methods, including oral, subcutaneous, and intrauterine; barrier methods, including male condom, female condom, or diaphragm with spermicidal gel) during the course of the study and for 3 months after the last dose of study treatment.
  • Willingness and ability to comply with study procedures
  • If on medications for Parkinson's disease drugs, then medication regimen must be stable for 60 days prior to enrollment
  • Abstention from use of other investigative or non-approved drugs for the duration of the trial

For Idiopathic Participants

  • A diagnosis of idiopathic Parkinson's disease confirmed by the presence of bradykinesia plus one or both of the following symptoms: rigidity or resting tremor; and with an abnormal DaTscan consistent with a dopaminergic deficit
  • Age 40 to 75 years
  • Within 5 years of diagnosis of Parkinson's disease

For Genetic Subtype Participants

  • A confirmed diagnosis of Parkinson's disease plus a genetic diagnosis consistent with Parkinson's disease, specifically PTEN-induced kinase 1 (PINK1), parkin, Leucine-rich repeat kinase 2 (LRRK2) or other mitochondrial genetic subtype
  • Age 21 to 75 years

Exclusion Criteria:

  • Allergy to PTC-589 or other components of the PTC-589 tablet formulation
  • Use of antioxidant supplements, specifically vitamins E and C beyond the recommended daily allowance
  • Other Parkinsonian disorders
  • Montreal Cognitive Assessment (MoCA) score of <24
  • Revised Hamilton Rating Scale for Depression ≥11
  • Parkinsonism due to drugs or toxins
  • Diagnosis of any other clinically significant neurologic disease that will confound the assessment of effect of study drug on disease progression
  • Malignancy within past 2 years
  • Pregnant or plans to become pregnant or breast feeding
  • History of stroke
  • History of brain surgery
  • Hepatic insufficiency with liver function tests (LFTs) >3 times upper limit of normal
  • Renal insufficiency as defined by creatinine >1.5 times normal
  • End stage cardiac failure
  • Participation within past 3 months and for duration of study in a trial of a device, drug, or other therapy for Parkinson's disease

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT02462603

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United States, California
Cedar's Sinai
Los Angeles, California, United States, 90048
University of California, San Francisco
San Francisco, California, United States, 94115
United States, Massachusetts
Beth Israel Deaconess Medical Center
Boston, Massachusetts, United States, 02215
Tuebingen, Germany, 72074
United Kingdom
University College of London,Dept. of Clinical Neuroscience
London, United Kingdom, NW3 2PF
Sponsors and Collaborators
Edison Pharmaceuticals Inc
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Study Director: Matthew B Klein, MD FACS Edison Pharmaceuticals
  Study Documents (Full-Text)

Documents provided by Edison Pharmaceuticals Inc:
Study Protocol  [PDF] September 29, 2017
Statistical Analysis Plan  [PDF] August 3, 2018

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Responsible Party: Edison Pharmaceuticals Inc
ClinicalTrials.gov Identifier: NCT02462603    
Other Study ID Numbers: EPI589-15-002
First Posted: June 4, 2015    Key Record Dates
Results First Posted: May 3, 2022
Last Update Posted: May 3, 2022
Last Verified: April 2022

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Studies a U.S. FDA-regulated Drug Product: Yes
Studies a U.S. FDA-regulated Device Product: No
Keywords provided by Edison Pharmaceuticals Inc:
Parkinson's Disease
Additional relevant MeSH terms:
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Parkinson Disease
Parkinsonian Disorders
Basal Ganglia Diseases
Brain Diseases
Central Nervous System Diseases
Nervous System Diseases
Movement Disorders
Neurodegenerative Diseases