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ARO-HSD

Phase 1

Non-alcoholic Steatohepatitis | Small molecule | Metabolic |Arrowhead Pharmaceuticals, Inc.|Trials Updated: Oct 3, 2025

ARO-HSD target and mechanism

ModalitySmall molecule

Also known as ARO-HSD Injection

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLED
Total Trials1
Total Enrollment50

FDA Designations

No designations recorded

ARO-HSD clinical trials

ARO-HSD · 1 trial · 1 indication

Phase 1 1
NCT04202354Study of ARO-HSD in Healthy Volunteers and Patients With Non-Alcoholic Steatohepatitis (NASH) or Suspected NASHNon-alcoholic Steatohepatitis
COMPLETED50 Analytics
PHASE1COMPLETED
Study of ARO-HSD in Healthy Volunteers and Patients With Non-Alcoholic Steatohepatitis (NASH) or Suspected NASH
Non-alcoholic SteatohepatitisUnlock trial analytics

Study Endpoints

Primary Endpoints

Number of Participants With Treatment-Emergent Adverse Events (TEAEs) Possibly or Probably Related to Treatment
From first dose of study drug through Day 113 (±5 days)

Adverse event (AE)=any untoward medical occurrence that does not necessarily have to have a causal relationship with this treatment. TEAEs=AEs with onset after administration of the study drug, or when a pre-existing medical condition increases in severity or frequency after study drug administration. Serious adverse event (SAE)= an AE that results in death; is life-threatening; requires inpatient hospitalization or prolongation of an existing hospitalization; results in persistent or significant disability/incapacity; is a congenital anomaly/birth defect; is a medically important event or reaction.

Secondary Endpoints

Pharmacokinetics (PK) of ARO-HSD: Plasma Concentrations
Normal Healthy Volunteers: Day 1: 2 hours pre-dose, 15 minutes, 30 minutes, 1, 2, 4, 8, 12, 18, 24; Day 2: 48 hours post-dose, Days 8, 15, 29. NASH Participants: Day 1: 2 hours pre-dose, 30 minutes, 1, 2, 24, hours post-dose, Days 8, 15, 29
PK of ARO-HSD in Normal Healthy Volunteers: Maximum Observed Plasma Concentration (Cmax)
Day 1: Predose, 15 minutes, 30 minutes, 1, 2, 4, 8 12, 18, 24, 48 hours postdose
PK of ARO-HSD in Normal Healthy Volunteers: Time to Reach Cmax (Tmax)
Day 1: Predose, 15 minutes, 30 minutes, 1, 2, 4, 8 12, 18, 24, 48 hours postdose
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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelSEQUENTIAL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Cohort 1: ARO-HSD 25 mgEXPERIMENTALNormal healthy volunteers randomized to double blind ARO-HSD 25 mg on Day 1 only.
Cohort 1: PlaceboPLACEBO_COMPARATORNormal healthy volunteers randomized to double blind placebo on Day 1 only.
Cohort 2: ARO-HSD 50 mgEXPERIMENTALNormal healthy volunteers randomized to double blind ARO-HSD 50 mg on Day 1 only.
Cohort 2: PlaceboPLACEBO_COMPARATORNormal healthy volunteers randomized to double blind placebo on Day 1 only.
Cohort 3: ARO-HSD 100 mgEXPERIMENTALNormal healthy volunteers randomized to double blind ARO-HSD 100 mg on Day 1 only.
Cohort 3: PlaceboPLACEBO_COMPARATORNormal healthy volunteers randomized to double blind placebo on Day 1 only.
Cohort 4: ARO-HSD 200 mgEXPERIMENTALNormal healthy volunteers randomized to double blind ARO-HSD 200 mg on Day 1 only.
Cohort 4: PlaceboPLACEBO_COMPARATORNormal healthy volunteers randomized to double blind placebo on Day 1 only.
Cohort 1b: ARO-HSD 25 mgEXPERIMENTALParticipants with suspected non-alcoholic steatohepatitis (NASH) receive open-label ARO-HSD 25 mg on Days 1 and 29.
Cohort 3b: ARO-HSD 100 mgEXPERIMENTALParticipants with suspected NASH receive open-label ARO-HSD 100 mg on Days 1 and 29.
Cohort 4b: ARO-HSD 200 mgEXPERIMENTALParticipants with suspected NASH receive open-label ARO-HSD 200 mg on Days 1 and 29.

Interventions

NameTypeDescription
ARO-HSD InjectionDRUGsingle or multiple doses of ARO-HSD by subcutaneous (sc) injections
sterile normal saline (0.9% NaCl)DRUGcalculated volume to match active treatment, by sc injection
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Eligibility Criteria

Age Range19 Years to 65 Years
SexALL
Healthy VolunteersYes
Study Sites1

Inclusion Criteria: * Women of child bearing potential must have a negative pregnancy test, cannot be breastfeeding and must be willing to use contraception * Willing to provide written informed consent and to comply with study requirements * On a stable diet for at least 4 weeks with no plans to s...

Countries:New Zealand
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Frequently asked questions about ARO-HSD

What is ARO-HSD used for?

ARO-HSD is an investigational therapy being developed for non-alcoholic steatohepatitis, or NASH, a metabolic liver condition. It has been studied in a Phase 1 trial that enrolled healthy volunteers along with patients who had NASH or suspected NASH. It is not an approved treatment.

Who makes ARO-HSD?

ARO-HSD is being developed by Arrowhead Pharmaceuticals, Inc., which trades on the Nasdaq under the ticker ARWR. The company sponsored the Phase 1 study of ARO-HSD in healthy volunteers and patients with NASH or suspected NASH.

What phase is ARO-HSD in?

ARO-HSD is in Phase 1 clinical development. Its single Phase 1 trial, NCT04202354, has been completed, and no trials of ARO-HSD are currently active. The drug remains investigational and has not been approved for any indication.

What clinical trials is ARO-HSD in?

ARO-HSD has been evaluated in one Phase 1 trial, NCT04202354, titled Study of ARO-HSD in Healthy Volunteers and Patients With Non-Alcoholic Steatohepatitis (NASH) or Suspected NASH. That trial was completed and enrolled 50 participants in New Zealand. It was randomized, double blind, and placebo controlled.

Is ARO-HSD the same as ARO-HSD Injection?

Yes. ARO-HSD Injection is another name for ARO-HSD, the investigational NASH therapy developed by Arrowhead Pharmaceuticals. Both names refer to the same asset, so searches for either term point to the same Phase 1 program.

How many patients were enrolled in the ARO-HSD trial?

The Phase 1 trial of ARO-HSD, NCT04202354, enrolled 50 participants. It included healthy volunteers as well as patients with NASH or suspected NASH, and participants were at least 19 years old. The study was randomized, double blind, and placebo controlled.