Follow Up Safety Study of SCH 420814 in Subjects With Parkinson's Disease (P05175)

A Phase 2, 36-Week, Open-Label, Uncontrolled Safety Follow-up Study Assessing SCH 420814 (Preladenant) 5 mg BID (P05175)

The purpose of this study is to assess the long term safety of SCH 420814 (preladenant) in participants with moderate to severe Parkinson's Disease who are taking an L-Dopa/dopa decarboxylase inhibitor and/or dopamine agonist. All participants must have participated in the main study (P04501; NCT00406029) entitled "A Phase 2, 12 Week, Double Blind, Dose Finding, Placebo Controlled Study to Assess the Efficacy and Safety of a Range of SCH 420814 Doses in Subjects With Moderate to Severe Parkinson's Disease Experiencing Motor Fluctuations and Dyskinesias."

Study Overview

• Status: Completed
• Conditions: Brain Diseases; Central Nervous System Diseases; Parkinson Disease; Movement Disorders; Neurodegenerative Diseases
• Intervention / Treatment: Drug: Preladenant; Drug: L-dopa; Drug: Other Parkinson's Disease treatments

• Study Type: Interventional
• Enrollment (Actual): 140
• Phase: Phase 2

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 30 years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

Description

Inclusion Criteria:

• Participants must have participated in P04501.
• Participants must be >=30 years of age, with a diagnosis of moderate to severe idiopathic Parkinson's disease.
• Participants must have been on a regimen of L-Dopa and/or a dopamine agonist.

Exclusion Criteria:

• Participants who discontinued from Study P04501 because they experienced a serious adverse event (SAE)
• Participants with any form of drug-induced or atypical parkinsonism, cognitive impairment, or psychosis
• Participants taking tolcapone
• Participants who are participating in any other clinical study

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: N/A
• Interventional Model: Single Group Assignment
• Masking: None (Open Label)

Number of Arms

1

Arms and Interventions

Participant Group / Arm

Intervention / Treatment

Experimental: Preladenant 5 mg BID; Preladenant 5 mg twice daily (BID) given open-label for 36 weeks to participants with moderate to severe Parkinson's Disease who are on a long-term and stable L-dopa treatment regimen.

Drug: Preladenant; 5 mg BID capsules; Other Names: SCH 420814; Privadenant; Drug: L-dopa; Participants must receive L-dopa as part of their usual ongoing treatment for Parkinson's Disease. L-dopa is often administered concomitantly with a dopa decarboxylase inhibitor (e.g., carbidopa).; Drug: Other Parkinson's Disease treatments; Participants may also receive other drugs as part of their usual ongoing treatment for Parkinson's Disease, such as dopamine agonists (e.g., pramipexole) and/or the catechol-O methyl transferase (COMT) inhibitor entacapone.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Number of Participants Who Experienced at Least One Adverse Event	An adverse event is defined as any unfavorable and unintended sign including an abnormal laboratory finding, symptom or disease associated with the use of a medical treatment or procedure, regardless of whether it is considered related to the medical treatment or procedure. A serious adverse event is an adverse event that that results in death, life threatening adverse event, permanent or significant disability / unfitness for work, hospital treatment (i.e., admission to hospital) or prolongation of a patient's length of stay, or congenital deformity or birth defect.	Up to 42 weeks

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Time Spent in "Off" State Per Day	Participant diaires recorded time spent in the "off" state at half-hourly intervals for at least 3 full days before scheduled visits. "Off" time is defined as when the participant's medication is not working as subjectively determined by the participant and his/her physician. Higher "off" time values relative to Baseline (BL) signify that the Parkinson's disease symptoms are worse (i.e., participant can only move slowly or not at all). BL was determined using two methods: 1) P04501 BL refers to the starting BL of the double-blind base study P04501 and 2) P04501 BL_LA refers to BL as defined by the last assessment taken in P04501. Endpoint refers to the last observed result for participants within P05175.	Baseline (P04501 BL; P04501 BL_LA), Week 4, Week 8, Week 12, Week 24, Week 36
Awake Time Per Day in the "on" State	Participant diaries recorded time spent in the "on" state at half-hourly intervals for at least 3 full days before scheduled visits. "On" time is defined as when the participant's medication is working as subjectively determined by the participant and his/her physician. Higher "on" time values relative to BL mean that the Parkinson's disease symptoms are better or absent (i.e., participant can move well). BL was determined using two methods: 1) P04501 BL refers to the starting BL of the double-blind base study P04501 and 2) P04501 BL_LA refers to BL as defined by the last assessment taken in P04501. Endpoint refers to the last observed result for participants within P05175.	Baseline (P04501 BL; P04501 BL_LA), Week 4, Week 8, Week 12, Week 24, Week 36
Time Spent in the "on" State With no Dyskinesias	Participant diaries recorded time spent in the "on" state with no dyskinesias at half-hourly intervals for at least 3 full days before scheduled visits. "On" time is defined as when the participant's medication is working as subjectively determined by the participant and his/her physician. Dyskinesias are a side effect of long-term therapy with L-dopa consisting of unintentional twisting and/or turning movements that occur in the "on" time. Higher values relative to BL signify an improvement in the Parkinson's disease symptoms (i.e., participant can move well) concomitant with no dyskinesias. BL was determined using two methods: 1) P04501 BL refers to the starting BL of the double-blind base study P04501 and 2) P04501 BL_LA refers to BL as defined by the last assessment taken in P04501. Endpoint refers to the last observed result for participants within P05175.	Baseline (P04501 BL; P04501 BL_LA), Week 4, Week 8, Week 12, Week 24, Week 36
Time Spent in the "on" State With Troublesome Dyskinesias	Participant diaries recorded time spent in the "on" state with troublesome dyskinesias at half-hourly intervals for at least 3 full days before scheduled visits. "On" time is defined as when the participant's medication is working as subjectively determined by the participant and his/her physician. Dyskinesias are a side effect of long-term therapy with L-dopa consisting of unintentional twisting and/or turning movements that occur in the "on" time; troublesome dyskinesias interfere with function or cause discomfort. Higher values relative to BL signify that the Parkinson's disease symptoms are better or absent (i.e., participant can move well) concomitant with troublesome dyskinesias. BL was determined using two methods: 1) P04501 BL refers to the starting BL of the double-blind base study P04501 and 2) P04501 BL_LA refers to BL as defined by the last assessment taken in P04501. Endpoint refers to the last observed result for participants within P05175.	Baseline (P04501 BL; P04501 BL_LA), Week 4, Week 8, Week 12, Week 24, Week 36
Time Spent in the "on" State Without Troublesome Dyskinesia	Participant diaries recorded time spent in the "on" state without troublesome dyskinesias at half-hourly intervals for at least 3 full days before scheduled visits. "On" time is defined as when the participant's medication is working as subjectively determined by the participant and his/her physician. Dyskinesias are a side effect of long-term therapy with L-dopa consisting of unintentional twisting and/or turning movements that occur in the "on" time; troublesome dyskinesias interfere with function or cause discomfort. Higher values relative to BL signify that the Parkinson's disease symptoms are better or absent (i.e., participant can move well) concomitant with absence of troublesome dyskinesias. BL was determined using two methods: 1) P04501 BL refers to the starting BL of the double-blind base study P04501 and 2) P04501 BL_LA refers to BL as defined by the last assessment taken in P04501. Endpoint refers to the last observed result for participants within P05175.	Baseline (P04501 BL; P04501 BL_LA), Week 4, Week 8, Week 12, Week 24, Week 36
Absolute Duration of Dyskinesias	Participant diaries recorded time spent in the "on" state with dyskinesias at half-hourly intervals for at least 3 full days before scheduled visits. "On" time is defined as when the participant's medication is working as subjectively determined by the participant and his/her physician. Dyskinesias are a side effect of long-term therapy with L-dopa consisting of unintentional twisting and/or turning movements that occur in the "on" time. Higher values relative to BL signify worsening of dyskinesia (i.e., more time spent with dyskinesia). BL was determined using two methods: 1) P04501 BL refers to the starting BL of the double-blind base study P04501 and 2) P04501 BL_LA refers to BL as defined by the last assessment taken in P04501. Endpoint refers to the last observed result for participants within P05175.	Baseline (P04501 BL; P04501 BL_LA), Week 4, Week 8, Week 12, Week 24, Week 36
Total Sleep Time	Participant diaries recorded time spent in the sleep state at half-hourly intervals for at least 3 full days before scheduled visits. BL was determined using two methods: 1) P04501 BL refers to the starting BL of the double-blind base study P04501 and 2) P04501 BL_LA refers to BL as defined by the last assessment taken in P04501. Endpoint refers to the last observed result for participants within P05175.	Baseline (P04501 BL; P04501 BL_LA), Week 4, Week 8, Week 12, Week 24, Week 36

Collaborators and Investigators

• Sponsor: Merck Sharp & Dohme LLC

Publications and helpful links

General Publications

• Factor SA, Wolski K, Togasaki DM, Huyck S, Cantillon M, Ho TW, Hauser RA, Pourcher E. Long-term safety and efficacy of preladenant in subjects with fluctuating Parkinson's disease. Mov Disord. 2013 Jun;28(6):817-20. doi: 10.1002/mds.25395. Epub 2013 Apr 15.

Study record dates

Study Major Dates

• Study Start (Actual): November 23, 2007
• Primary Completion (Actual): November 19, 2009
• Study Completion (Actual): November 19, 2009

Study Registration Dates

• First Submitted: September 27, 2007
• First Submitted That Met QC Criteria: September 27, 2007
• First Posted (Estimate): September 28, 2007

Study Record Updates

• Last Update Posted (Actual): February 2, 2021
• Last Update Submitted That Met QC Criteria: January 19, 2021
• Last Verified: January 1, 2021

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Parkinsonian Disorders; Basal Ganglia Diseases; Synucleinopathies; Parkinson Disease; Nervous System Diseases; Brain Diseases; Neurodegenerative Diseases; Movement Disorders; Central Nervous System Diseases; Physiological Effects of Drugs; Neurotransmitter Agents; Molecular Mechanisms of Pharmacological Action; Dopamine Agents; Antiparkinson Agents; Anti-Dyskinesia Agents; Levodopa
• Other Study ID Numbers: P05175; MK-3814-021 (Other Identifier: Merck)

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: Yes
• IPD Plan Description: http://engagezone.msd.com/doc/ProcedureAccessClinicalTrialData.pdf