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SAGE-718

Phase 2

Huntington Disease | Small molecule | Rare Disease |Supernus Pharmaceuticals, Inc.|Last Updated: Sep 17, 2025

Success Probability
Approval Probability 71%
TA Base Rate26%
Adjusted LOA41%
ML RiskLOW_RISK
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Market & Valuation
rNPV $3.2B
Market Size $9.4B
Revenue Basis $1.6B
Competitors 6
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Trial Design
RandomizedDouble-BlindPLACEBO_CONTROLLEDDMCBiomarker
Total Trials2
Total Enrollment75
FDA Designations
No designations recorded
Clinical Trials (2)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT0535882128-Day Study of SAGE-718 on Functioning Capacity in Participants With Huntington's DiseasePHASE2 COMPLETED 69May 26, 2022Apr 10, 2024Sep 15, 202514 United States, Canada
NCT03787758A Study to Evaluate Safety, Tolerability, and Pharmacokinetics of SAGE-718 Oral Solution in Patients With Huntington's Disease - Part BPHASE1 COMPLETED 6Feb 28, 2019Oct 7, 2019Sep 17, 20252 United States
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Study Endpoints
Primary Endpoints
Difference in Huntington's Disease Cognitive Assessment Battery (HD-CAB) Composite Score Between Participants With HD vs HP at Baseline
Baseline

HD-CAB assesses cognitive function using 6 subtests:Symbol Digit Modalities Test-correctly coded items(0-110); One Touch Stockings of Cambridge(OTS)-mean time to reach correct response(range not defined); Trail Making Test Trail B (TMT-B)-time to complete task(0-240 sec); Hopkins Verbal Learning Test Revised-total correct recall trials(0-48); Paced Tapping Test-reciprocal of standard deviation(SD) of intertap intervals (range not defined); Emotion Recognition Test-negative emotions correctly identified(0-24). Values of OTS \& TMT B are multiplied by -1 to represent higher is better direction as other tests. Each of 6 subtests scores was transformed to z-score(range not defined;low negative value represents cognitive impairment), which is calculated by subtracting mean and dividing by SD of HP at baseline. HD-CAB composite=average of 6 z-scores. Negative HD-CAB of HD participants=decline in cognitive function relative to HP. Assessment is relative to reference group(healthy population).

Number of Participants with the Incidence of Adverse Events and Serious Adverse Events.
21 Days
Percentage of participants with change from baseline in vital signs.
21 Days
Change from baseline in electrocardiograms (ECGs) including PR interval, QT interval, QTc interval, QTcF, and rhythm abnormalities
21 Days
Percentage of participants with change from baseline in clinical laboratory parameters.
21 Days
Change from baseline in Columbia-Suicide Severity Rating Scale (C-SSRS).
21 Days
Secondary Endpoints
Number of Participants With HD With Treatment-Emergent Adverse Events (TEAEs) and Serious TEAEs
Up to Day 42
Number of Participants With HD With Clinically Significant Change From Baseline in Vital Sign Measurements
Up to Day 42
Number of Participants With HD With Clinically Significant Change From Baseline in Clinical Laboratory Assessments
Up to Day 42
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Study Design & Arms
AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
SAGE-718EXPERIMENTALParticipants with HD will receive SAGE-718 1.2 milligrams (mg), orally, once daily for up to 28 days.
PlaceboPLACEBO_COMPARATORParticipants with HD will receive SAGE-718-matching placebo, orally, once daily for up to 28 days.
Healthy ParticipantsNO_INTERVENTIONHP enrolled in this study will not receive any investigational product (IP) (SAGE-718 or placebo).
Interventions
NameTypeDescription
SAGE-718DRUGSAGE-718 oral softgel lipid capsules
PlaceboDRUGSAGE-718-matching oral capsules
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Eligibility Criteria
Age Range25 Years — 65 Years
SexALL
Healthy VolunteersYes
Study Sites14

Inclusion Criteria: For all 1. Agree to refrain from drugs of abuse for the duration of the study and from alcohol during the 48 hours preceding each study visit. Additional criteria for participants with HD only: 2. Be ambulatory, able to travel to the study center, and, judged by the investi...

Countries:United StatesCanada
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Competitive Landscape -Huntington's Disease 9 trials