A Study to Evaluate the Safety and Tolerability of SAGE-718 in Participants With Parkinson's Disease Mild Cognitive Impairment (PD-MCI)

Phase 2

Completed

Conditions: Parkinson Disease
Cognitive Dysfunction

Interventions: Drug: SAGE-718

Registration Number: NCT04476017

Lead Sponsor: Sage Therapeutics

Brief Summary: The primary purpose of this two-part study was to evaluate the safety and tolerability of SAGE-718 and its effects on cognitive, neuropsychiatric, and motor symptoms in participants with Parkinson's disease mild cognitive impairment (PD-MCI).

Detailed Description: Not available

Recruitment & Eligibility

Status: COMPLETED

Sex: All

Target Recruitment: 18

Inclusion Criteria

Meet the following criteria for PD-MCI: Have a confirmed diagnosis of idiopathic PD according to 2015 Movement Disorder Society (MDS) clinical diagnostic criteria; Meet MDS Task Force Criteria for MCI in PD.
Have a score of 20 to 25 (inclusive) on the Montreal Cognitive Assessment (MoCA) at Screening.
Meet criteria for Hoehn & Yahr Stage I to III (mild to moderate motor severity) at Screening.
Have stable motor symptoms for at least 4 weeks prior to screening, in the opinion of the investigator.

Exclusion Criteria

Have a diagnosis of dementia of any etiology, including but not limited to: Dementia associated with PD (probable or possible), Dementia with Lewy Bodies, Alzheimer's Dementia, and Vascular Dementia.
Have any indication of parkinsonism other than idiopathic PD.
In the opinion of the investigator, be experiencing unpredictable fluctuations in motor and/or nonmotor symptoms associated with PD.
Have an ongoing central nervous system condition other than idiopathic PD, including active neurologic and/or nonremitted psychiatric disorders, in the opinion of the investigator.
Have a history of brain surgery, deep brain stimulation, a significant head injury causing loss of consciousness greater than 30 minutes, or hospitalization due to a brain injury.
Have experienced significant psychotic symptoms within the past 3 months, including those associated with PD medications, as determined by the investigator.

Study & Design

Study Type: INTERVENTIONAL

Study Design: SEQUENTIAL

Arm && Interventions

Group	Intervention	Description
Part A: SAGE-718 3 mg	SAGE-718	Participants received SAGE-718 3 milligrams (mg) tablets, once daily with food in the morning for 14 days.
Part B: SAGE-718 3 mg	SAGE-718	Participants received SAGE-718 3 mg tablets, once daily with food in the morning for 28 days.

Primary Outcome Measures

Name	Time	Method
Part B: Percentage of Participants With at Least One Treatment-Emergent Adverse Event (TEAE)	From first dose of study drug up to 42 days	An AE was any untoward medical occurrence in a participant administered with a pharmaceutical product and that does not necessarily have a causal relationship with this treatment. An AE can therefore be any unfavorable and unintended sign, symptom, or disease temporally associated with the use of an IP whether or not related to the product. An AE can include any undesirable medical condition, even if no study treatment has been administered. TEAEs were defined as an AE with an onset date on or after the date of the first dose of IP or any worsening of a pre-existing medical condition/AE with onset after the start of IP and throughout the study. Percentages are rounded off to the nearest single decimal.
Part A: Percentage of Participants With at Least One Treatment-Emergent Adverse Event (TEAE)	From first dose of study drug up to 28 days	An adverse event (AE) was any untoward medical occurrence in a participant administered with a pharmaceutical product and that does not necessarily have a causal relationship with this treatment. An AE can therefore be any unfavorable and unintended sign, symptom, or disease temporally associated with the use of an IP whether or not related to the product. An AE can include any undesirable medical condition, even if no study treatment has been administered. TEAEs were defined as an AE with an onset date on or after the date of the first dose of IP or any worsening of a pre-existing medical condition/AE with onset after the start of IP and throughout the study. Percentages are rounded off to the nearest single decimal.

Secondary Outcome Measures

Name	Time	Method
Part A and B: Percentage of Participants With Clinically Significant Changes in Vital Sign Measurements	From first dose of study drug up to 28 days for Part A, and up to 42 days for Part B	Vital signs included temperature, respiratory rate, heart rate (supine and standing), systolic blood pressure (supine and standing) and diastolic blood pressure (supine and standing). Percentage of participants with clinically significant change in vital signs measurements which were deemed clinically significant by the investigator were reported.
Part A and B: Percentage of Participants With Clinically Significant Changes in Laboratory Assessments	From first dose of study drug up to 28 days for Part A, and up to 42 days for Part B	Laboratory tests assessments included hematology, biochemistry, coagulation and urinalysis. Percentage of participants with clinically significant change in laboratory assessments which were deemed clinically significant by the investigator were reported.
Part A and B: Percentage of Participants With a Response of 'Yes' to Any Suicidal Ideation or Suicidal Behaviors Item Assessed Using the Columbia Suicide Severity Rating Scale (C-SSRS)	From first dose of study drug up to 28 days for Part A, and up to 42 days for Part B	The C-SSRS scale consisted of a baseline evaluation (at screening) that assessed the lifetime experience of participants with suicidal ideation (SI) and suicidal behavior (SB) and a postbaseline evaluation that focused on suicidality since the last study visit. The C-SSRS included "yes" or "no"' responses for assessment of suicidal ideation and behavior as well as numeric ratings for the severity of ideation, if present (from 1 to 5, with 5 being the most severe). The C-SSRS SI items involved wish to be dead, non-specific active suicidal thoughts, active SI with any methods, active SI with some intent and active SI with a specific plan. The C-SSRS SB items involved preparatory acts or behavior, aborted attempt, interrupted attempt, actual attempt (non-fatal) and completed suicide. Percentage of participants with a response of 'yes' are reported for both suicidal ideation and behavior in this OM.
Part A and B: Percentage of Participants With Clinically Significant Changes in Electrocardiogram (ECG) Measurements	From first dose of study drug up to 28 days for Part A, and up to 42 days for Part B	Supine 12-lead ECGs were performed in triplicate and the standard intervals (heart rate, PR interval, QRS duration, QT interval, and corrected QT interval by Fridericia \[QTcF\]). Percentage of participants with clinically significant change in ECG measurements which were deemed clinically significant by the investigator were reported.