Evaluation of Safety and Tolerability of ENT-01 for the Treatment of Parkinson's Disease Related Constipation (RASMET)

A Multi-Center, Single-Dose, Multiple-Dose, Double-Blind, Placebo-Controlled Study to Evaluate Safety, Tolerability, Pharmacokinetics and Pharmacodynamics of Orally Administered ENT-01 for the Treatment of Parkinson's Disease Related Constipation

This is a Phase 1/2a study to assess the safety, tolerability, pharmacokinetics, and pharmacodynamics of an orally-administered medication to relieve symptoms of constipation associated with Parkinson's Disease. Ten patients will be enrolled in Phase 1, and will be studied over an 8-12 week period. Forty patients will be enrolled in Phase 2, and will be studied over an 8-10 week period. All subjects will receive the study drug during one of the observational periods of the study.

Study Overview

• Status: Completed
• Conditions: Parkinson's Disease; Constipation
• Intervention / Treatment: Drug: ENT-01; Other: Placebo

Detailed Description

Phase 1 will enroll 10 patients to assess the safety, tolerability, and pharmacokinetics of single escalating doses over a 30-60 day period. The dose-escalation period will be preceded by a 2-week run in period and followed by a 2-week wash-out period.

Phase 2 follow the safe completion of Phase 1. It will enroll 40 patients and is composed of 4 periods of study: 1) a 2-week run-in period, 2) a 3-5 week escalating dose period to identify a prokinetic dose in the initial set of 10 patients, 3) a 1-week period of randomized dosing (placebo versus the previously identified pro-kinetic dose), and 4) a 2-week wash-out period. Pharmacodynamics will be assessed along with safety and tolerability. Relative outcomes will be compared within each patient and across groups for the randomized dosing period.

Frequency of bowel movements and other non-motor symptoms of Parkinson's Disease will be collected over the course of both phases.

• Study Type: Interventional
• Enrollment (Actual): 50
• Phase: Phase 2; Phase 1

Contacts and Locations

Study Locations

• United States
  • California
    • Los Angeles, California, United States, 90033
      • Keck Hospital of University of Southern California
  • Colorado
    • Englewood, Colorado, United States, 80113
      • Rocky Mountain Movement Disorders Center, PC
  • District of Columbia
    • Washington, District of Columbia, United States, 20007
      • Georgetown Universtiy, Department of Neurology
  • Florida
    • Boca Raton, Florida, United States, 33486
      • Parkinson's Disease And Movement Disorders Center of Boca Raton
    • Jacksonville, Florida, United States, 32209
      • Neuroscience Research, University of Florida Jacksonville
    • Port Charlotte, Florida, United States, 33952
      • MEDSOL Clinical Research
    • Saint Petersburg, Florida, United States, 33713
      • Suncoast Neuroscience Associates, Inc
    • Sarasota, Florida, United States, 34239
      • Sarasota Memory Hospital Clinical Research Ctr.
    • Tampa, Florida, United States, 33613
      • USF Health Byrd Parkinson's Disease Movement Disorders Center of Excellence
  • Michigan
    • Farmington Hills, Michigan, United States, 48334
      • Quest Research Institute
  • New York
    • New York, New York, United States, 10029
      • Movement Disorders Division, Mt. Sinai School of Medicine
  • Ohio
    • Cincinnati, Ohio, United States, 45212
      • Riverhills Healthcare, Inc.
    • Cleveland, Ohio, United States, 44106
      • Parkinson's & Movement Disorders Center, UH Cleveland Medical Center
  • Pennsylvania
    • Hershey, Pennsylvania, United States, 17033
      • Penn State Health, Department of Neurology
    • Philadelphia, Pennsylvania, United States, 19107
      • Thomas Jefferson University, Department of Neurology

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 30 years to 86 years (Adult, Older Adult)
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

1. Parkinson's disease diagnosis confirmed by a neurologist specializing in movement disorders
2. Insufficient criteria for a diagnosis of Irritable Bowel Syndrome
3. Constipation for over 6 months, unresponsive to Milk of Magnesia, and requiring at least weekly treatment using an oral laxative, stool softener, bulking agent, and/or a suppository, and dissatisfaction with current treatment.
4. Body Mass Index is 18-40 kg/m2
5. At least 2 of the Rome IV functional constipation criteria are met
6. Loose stools are rarely present without the use of laxatives
7. Patient is willing and able to sign informed consent and comply with all study procedures

8. Patients must be able to read, understand, and accurately record data into the diary to guarantee full participation in the study

   Females only:

9. Must have negative serum or urine pregnancy tests and must not be lactating
10. If of child-bearing age: Must agree to using a hormonal (i.e., oral, implantable, or injectable) and either single- or double-barrier method of birth control throughout the study period. A vasectomized partner will be allowed as one in conjunction with another single-barrier method.
11. If unable to have children: Must have this documented in the case report form (i.e., ubal ligation, hysterectomy, or post-menopausal [defined as a minimum of one year since last menstrual period]). Post-menopausal status will be confirmed by follicle stimulating hormone in women less than 60 years of age.

Exclusion Criteria:

1. Unable or unwilling to provide informed consent or to comply with study procedures
2. Diagnosis of secondary constipation beyond that of PD
3. Structural or metabolic diseases that affect the GI system
4. Functional GI disorder
5. Unable or unwilling to withdraw from taking the following medications 2 weeks prior to the dose-escalation period and throughout the study: Laxatives, opiates, sedatives, hypnotics, anti-histamines, protein pump inhibitors or any medications which may cause constipation
6. History of recent major surgery (within 60 days of screening)
7. Any clinically significant abnormalities on screening laboratories or physical examination as determined by the Investigator
8. Neurological disorder other than PD
9. On treatment with intra-jejunal dopamine
10. Treatment with COMT inhibitors for fewer than 4 weeks (entacapone, tolcapone, Stalevo)
11. Unable to maintain a stable diet regimen
12. Patients with a cognitive impairment that preclude them from understanding the informed consent
13. Patients placed under legal guardianship
14. Acute GI illness within 48 hours of the baseline period
15. History of major GI surgery (e.g. previous abdominal surgery, including cholecystectomy), except that patients with uncomplicated appendectomy are allowed
16. ALT or AST > 1.5 X upper limit of normal (ULN) during screening
17. Females who are pregnant or breastfeeding
18. History of excessive alcohol use or substance abuse
19. Patient or caregiver unable to administer daily oral dosing
20. Participation in an investigational clinical study within the 6 months prior to dosing in the present study
21. Any other reason, which in the opinion of the Investigator would confound proper interpretation of the study

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Randomized
• Interventional Model: Sequential Assignment
• Masking: Quadruple

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: ENT-01; ENT-01 at a to-be-determined dose taken by mouth every day upon awakening.	Drug: ENT-01; Daily dosing with ENT-01. ENT-01 is an orally administered proprietary substance formulated as a small 25mg coated tablet. Dosing will range from 25-200mg, and the dose will be taken upon awakening on an empty stomach with 8oz water simultaneous to dopamine.
Placebo Comparator: Placebo Comparator; Placebo to be taken by mouth every day upon awakening	Other: Placebo; Daily dosing with a placebo

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Number of Participants With Treatment-related Adverse Events as Assessed by Common Terminology Criteria for Adverse Events.	Specific treatment related events of recurrent vomiting, recurrent diarrhea, abdominal pain, and hypotension will be assessed with respect to grade and frequency of occurrence.	Through study completion, up to 11 weeks

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Frequency of Bowel Movements	The frequency of spontaneous bowel movements will be assessed at each dose across the study population and compared to baseline measures.	Through study completion, up to 11 weeks

Collaborators and Investigators

• Sponsor: Enterin Inc.
• Investigators: Study Chair: Denise Barbut, MD FRCP, Enterin Inc.; Principal Investigator: Steven Frucht, MD, NYU Langone Health; Principal Investigator: Robert Hauser, MD MBA, University of South Florida

Publications and helpful links

General Publications

• Hauser RA, Sutherland D, Madrid JA, Rol MA, Frucht S, Isaacson S, Pagan F, Maddux BN, Li G, Tse W, Walter BL, Kumar R, Kremens D, Lew MF, Ellenbogen A, Oguh O, Vasquez A, Kinney W, Lowery M, Resnick M, Huff N, Posner J, Ballman KV, Harvey BE, Camilleri M, Zasloff M, Barbut D. Targeting neurons in the gastrointestinal tract to treat Parkinson's disease. Clin Park Relat Disord. 2019 Jul 2;1:2-7. doi: 10.1016/j.prdoa.2019.06.001. eCollection 2019.

Study record dates

Study Major Dates

• Study Start (Actual): May 11, 2017
• Primary Completion (Actual): April 25, 2018
• Study Completion (Actual): June 14, 2018

Study Registration Dates

• First Submitted: February 3, 2017
• First Submitted That Met QC Criteria: February 6, 2017
• First Posted (Estimated): February 9, 2017

Study Record Updates

• Last Update Posted (Actual): December 27, 2023
• Last Update Submitted That Met QC Criteria: December 4, 2023
• Last Verified: December 1, 2023

More Information

Terms related to this study

• Keywords: non-motor symptoms
• Additional Relevant MeSH Terms: Brain Diseases; Central Nervous System Diseases; Nervous System Diseases; Signs and Symptoms, Digestive; Parkinsonian Disorders; Basal Ganglia Diseases; Movement Disorders; Synucleinopathies; Neurodegenerative Diseases; Parkinson Disease; Constipation
• Other Study ID Numbers: ENT-01

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO
• IPD Plan Description: Anonymized data may be shared with other clinical researchers outside of this study that are involved in similar research at non-participating institutions.

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: Yes
• Studies a U.S. FDA-regulated device product: No