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sabirnetug

Phase 2

Alzheimer Disease | Small molecule | Neurology |Acumen Pharmaceuticals, Inc.|Last Updated: Oct 27, 2025

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Trial Design
RandomizedDouble-BlindPLACEBO_CONTROLLEDDMC
Total Trials2
Total Enrollment570
FDA Designations
FAST_TRACK
Clinical trial landscape

sabirnetug · 2 trials · 1 indication

Phase 2 1Phase 1 1
NCT06335173A Study to Evaluate Efficacy and Safety of Intravenous Sabirnetug in Participants With Early Alzheimer's Disease (ALTITUDE-AD)Alzheimer Disease
ACTIVE NOT_RECRUITING542 Analytics
PHASE2ACTIVE NOT_RECRUITING
A Study to Evaluate Efficacy and Safety of Intravenous Sabirnetug in Participants With Early Alzheimer's Disease (ALTITUDE-AD)
Alzheimer DiseaseUnlock trial analytics
Study Endpoints
Primary Endpoints
Change from Baseline in Integrated Alzheimer's Disease Rating Scale (iADRS) Score
Baseline up to Week 80

iADRS is a validated composite of cognition and function made up of Alzheimer's Disease Assessment Scale - Cognitive Subscale 13-item (ADAS-Cog13) and the Alzheimer's Disease Cooperative Study - instrumental Activities of Daily Living scale (ADCS-iADL). ADAS-Cog13 is a rater-administered instrument consisting of 13 items assessing cognitive function areas most typically impaired in AD. ADAS-Cog13 scores range from 0 to 85, with higher scores indicating a greater deficit of global cognition. The ADCS-iADL is a subset of the 23-item ADCS-ADL (items 6a and 7 to 23). The iADLs are more complex skills required to successfully live independently. iADL-items score ranges from 0 to 59 (lower scores indicating greater impairment). The iADRS is calculated as a linear combination of total scores from the ADAS-Cog13 and ADCS-iADL. The iADRS score ranges from 0 to 144 with lower scores indicating worse performance.

Estimate blood levels of sabirnetug (ACU193)
Group 1: Day 1 (predose) up to Day 43 Group 2: Day 1 (predose) up to Day 50

Cmax (Maximum concentration, determined directly from individual concentration-time data)

Estimate time to reach maximum blood levels of sabirnetug (ACU193)
Group 1: Day 1 (predose) up to Day 43 Group 2: Day 1 (predose) up to Day 50

Tmax (Time of the maximum concentration)

Estimate blood levels of sabirnetug (ACU193), terminal rate
Group 1: Day 1 (predose) up to Day 43 Group 2: Day 1 (predose) up to Day 50

λz (The observed terminal rate constant; estimated by linear regression through at least three data points in the terminal phase of the log concentration-time profile)

Estimate time to reach half-life blood levels of sabirnetug (ACU193), half-life
Group 1: Day 1 (predose) up to Day 43 Group 2: Day 1 (predose) up to Day 50

T1/2 (The observed terminal half-life)

Estimate blood levels of sabirnetug (ACU193), concentration-time
Group 1: Day 1 (predose) up to Day 43 Group 2: Day 1 (predose) up to Day 50

AUC168h (Area under the concentration-time curve during a one-week dosing interval)

Estimate blood levels of sabirnetug (ACU193), last concentration-time
Group 1: Day 1 (predose) up to Day 43 Group 2: Day 1 (predose) up to Day 50

AUClast (Area under the concentration-time curve from time zero to the time of the last quantifiable concentration; calculated using the linear trapezoidal rule)

Estimate blood levels of sabirnetug (ACU193), infinity concentration-time
Group 1: Day 1 (predose) up to Day 43 Group 2: Day 1 (predose) up to Day 50

AUCinf (Area under the concentration-time curve from time zero extrapolated to infinity)

Estimate blood levels of sabirnetug (ACU193), extrapolation
Group 1: Day 1 (predose) up to Day 43 Group 2: Day 1 (predose) up to Day 50

AUCExtrap (%)(The percentage of AUCinf based on extrapolation)

Estimate blood levels of sabirnetug (ACU193), Clast
Group 1: Day 1 (predose) up to Day 43 Group 2: Day 1 (predose) up to Day 50

Clast (The last quantifiable concentration determined directly from individual concentration-time data)

Estimate time to reach last blood levels of sabirnetug (ACU193)
Group 1: Day 1 (predose) up to Day 43 Group 2: Day 1 (predose) up to Day 50

Tlast (Time of the last quantifiable concentration)

Secondary Endpoints
Change from Baseline in ADCS-iADL Score
Baseline up to Week 80
Change from Baseline in ADAS-Cog13 Score
Baseline up to Week 80
Change from Baseline in Clinical Dementia Rating - Sum of Boxes (CDR-SB)
Baseline up to Week 80
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Study Design & Arms
AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
Double-blind Treatment (DBT) Period: sabirnetug 35 mg/kgEXPERIMENTALParticipants will receive sabirnetug, 35 milligrams per kilogram (mg/kg), Q4W as intravenous (IV) infusion during the DBT period.
DBT Period: sabirnetug 50 mg/kgEXPERIMENTALParticipants will receive sabirnetug, 35 mg/kg, for the first two doses, followed by sabirnetug, 50 mg/kg, Q4W as an IV infusion during the DBT period.
DBT Period: PlaceboPLACEBO_COMPARATORParticipants will receive sabirnetug matching placebo, Q4W as an IV infusion during the DBT period.
Open-Label Extension (OLE) Period: sabirnetug 35 mg/kgEXPERIMENTALParticipants will receive sabirnetug, 35 mg/kg, Q4W as an IV infusion during the OLE period.
Arm 1EXPERIMENTAL12 participants receive sabirnetug by intravenous infusion
Arm 2EXPERIMENTAL16 participants receive sabirnetug + rHuPH20 by subcutaneous injection
Interventions
NameTypeDescription
sabirnetugDRUGIntravenous sabirnetug
PlaceboDRUGIntravenous Placebo
sabirnetug (ACU193)DRUGsabirnetug by intravenous infusion
Sabirnetug + rHuPH20COMBINATION_PRODUCTsabirnetug + rHuPH20 by subcutaneous injection
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Eligibility Criteria
Age Range50 Years to 90 Years
SexALL
Healthy VolunteersNo
Study Sites68

Inclusion Criteria: * Body weight of at least 30 kilograms (kg) (66 pounds \[lbs\]) and no more than 160 kg (352 lbs) at Screening * Must consent to apolipoprotein E4 (APOE4) genotype status assessment * Must meet all of the following criteria 1. National Institute on Aging-Alzheimer's Associati...

Countries:United StatesCanadaGermanySpainUnited Kingdom
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Recent Changes (Last 90 Days)
LOWMay 26, 2026NCT06335173primaryCompletionDate: changed
LOWMay 24, 2026NCT06335173studyFirstPostDate: changed