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sabirnetug

Phase 2

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

Success Probability

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Market & Valuation

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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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Frequently asked questions about sabirnetug

What is sabirnetug used for?

Sabirnetug is an investigational small molecule being developed for the treatment of Alzheimer Disease. It is currently in Phase 2 clinical development and has not been approved by the FDA. The drug is being studied in patients with early Alzheimer's disease.

Who makes sabirnetug?

Sabirnetug is being developed by Acumen Pharmaceuticals, Inc., a biopharmaceutical company traded on the NASDAQ under the ticker symbol ABOS. The company is conducting clinical trials to evaluate the drug's safety and efficacy in Alzheimer's disease.

What phase is sabirnetug in?

Sabirnetug is currently in Phase 2 clinical development for Alzheimer Disease. It has received Fast Track designation from the FDA, which is intended to expedite the development and review of drugs for serious conditions. The drug remains investigational and is not yet approved.

What clinical trials is sabirnetug in?

Sabirnetug is being evaluated in two clinical trials. The Phase 2 trial NCT06335173, named ALTITUDE-AD, is an active, placebo-controlled study in 542 participants with early Alzheimer's disease across the US, Canada, Germany, Spain, and the UK. A Phase 1 trial NCT06511570, comparing intravenous and subcutaneous formulations, has been completed.

Is sabirnetug FDA approved?

Sabirnetug is not FDA approved. It is an investigational drug currently in Phase 2 clinical trials for Alzheimer Disease. The FDA has granted it Fast Track designation, which facilitates development, but the drug has not yet received marketing approval.