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Plozasiran

Phase 3

Severe Hypertriglyceridemia | Small molecule | Metabolic |Arrowhead Pharmaceuticals, Inc.|Last Updated: Jul 23, 2026

Target and mechanism

Target class-Siran (Sirna)
ModalitySmall molecule

Also known as Plozasiran Injection

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLEDDMC
Total Trials3
Total Enrollment1,045

FDA Designations

BREAKTHROUGH_THERAPY

Clinical trial landscape

Plozasiran · 7 trials · 4 indications

Phase 3 7
NCT06880770Study of Plozasiran in Adults With Severe Hypertriglyceridemia at Risk of Acute PancreatitisSevere Hypertriglyceridemia
RECRUITING288 Analytics
NCT06822790Long-Term Safety and Efficacy of Plozasiran in Adults With HypertriglyceridemiaHypertriglyceridemia
RECRUITING869 Analytics
NCT06347016Study of Plozasiran in Adults With Severe HypertriglyceridemiaSevere Hypertriglyceridemia
ACTIVE NOT_RECRUITING311 Analytics
NCT06347003Study of Plozasiran (ARO-APOC3) in Adults With Severe HypertriglyceridemiaSevere Hypertriglyceridemia
ACTIVE NOT_RECRUITING446 Analytics
NCT06347133Phase 3 Study of Plozasiran in Adults With HypertriglyceridemiaHypertriglyceridemia
ACTIVE NOT_RECRUITING1,456 Analytics
NCT05902598A Phase 3 Study of ARO-APOC3 / VSA001 / SAR449124 (Plozasiran) in Chinese Adults With Familial Chylomicronemia SyndromeFamilial Chylomicronemia Syndrome
COMPLETED37 Analytics
NCT05089084Study of ARO-APOC3 (Plozasiran) in Adults With Familial Chylomicronemia Syndrome (FCS)Familial Chylomicronemia
COMPLETED75 Analytics
PHASE3RECRUITING
Study of Plozasiran in Adults With Severe Hypertriglyceridemia at Risk of Acute Pancreatitis
Severe HypertriglyceridemiaUnlock trial analytics
PHASE3RECRUITING
Long-Term Safety and Efficacy of Plozasiran in Adults With Hypertriglyceridemia
HypertriglyceridemiaUnlock trial analytics
PHASE3ACTIVE NOT_RECRUITING
Study of Plozasiran in Adults With Severe Hypertriglyceridemia
Severe HypertriglyceridemiaUnlock trial analytics
PHASE3ACTIVE NOT_RECRUITING
Study of Plozasiran (ARO-APOC3) in Adults With Severe Hypertriglyceridemia
Severe HypertriglyceridemiaUnlock trial analytics
PHASE3ACTIVE NOT_RECRUITING
Phase 3 Study of Plozasiran in Adults With Hypertriglyceridemia
HypertriglyceridemiaUnlock trial analytics
PHASE3COMPLETED
A Phase 3 Study of ARO-APOC3 / VSA001 / SAR449124 (Plozasiran) in Chinese Adults With Familial Chylomicronemia Syndrome
Familial Chylomicronemia SyndromeUnlock trial analytics
PHASE3COMPLETED
Study of ARO-APOC3 (Plozasiran) in Adults With Familial Chylomicronemia Syndrome (FCS)
Familial ChylomicronemiaUnlock trial analytics

Study Endpoints

Primary Endpoints

Time to First Occurrence of Positively Adjudicated AP Event (Event Occurring More Than 10 Days After First Dose of Study Drug)
Randomization up to end of Double Blind Treatment Period compared to placebo (Approximate Maximum 50 Months)]
Number of Participants with Treatment-Emergent Adverse Events (TEAEs)
From first dose of study drug through Month 24
Percent change in fasting serum TG levels from baseline to Month 12 compared to placebo
Baseline, Month 12
Percent Change in Fasting Serum Triglyceride (TG) Levels from Baseline to Month 12 Compared to Placebo
Baseline, Month 12
Percent Change From Baseline in Fasting Serum Triglyceride (TG) at Month 10
Baseline to Month 10

Blood samples for lipid parameters were collected at the specified time points. Fasting serum TG at Month 10 was defined as geometric mean of 2 measurements taken during Month 10, or the other non-missing measurement if any one of the two measurements was missing during Month 10. Analysis was performed on the basis of the handling strategy for intercurrent events, missing fasting serum was imputed mainly based on the Pattern Mixture Models (PMM). Descriptive statistics were calculated based on non-imputed data.

Percent Change From Baseline at Month 10 in Fasting Triglycerides (TG)
Baseline, Month 10

Secondary Endpoints

Percent Change from Baseline in Fasting Serum Triglyceride (TG) Levels
Baseline up to end of Double Blind Treatment Period compared to placebo (Approximate Maximum 50 Months)
Proportion of Participants Who Achieve Average Fasting TG Levels of < 880 mg/dL (10 mmol/L)
From Month 3 up to end of Double Blind Treatment Period compared to placebo (Approximate Maximum 50 Months)
Proportion of Participants Who Achieve Fasting TG Levels of < 500 mg/dL (5.65 mmol/L)
From Month 3 up to end of Double Blind Treatment Period compared to placebo (Approximate Maximum 50 Months)
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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Plozasiran InjectionEXPERIMENTALPlozasiran by SC injection every 3 months (Q3M) through completion of the randomized period Plozasiran by SC injection Q3M through completion of the OLE period
PlaceboEXPERIMENTALcalculated volume to match active treatment by SC injection (randomized period)
Plozasiran 25 mgEXPERIMENTALPlozasiran 25 mg administered every 3 months for 12 months (randomized period), followed by an open-label period of 12 months
Plozasiran 50 mgEXPERIMENTALPlozasiran 50 mg administered every 3 months for 12 months (randomized period), followed by an open-label period of 12 months
ARO-APOC3 (Plozasiran) 25 mgEXPERIMENTALRandomized Period: plozasiran 25 mg Q3M for a total of 4 doses. Open-label Period (Parts A and B): plozasiran 25 mg Q3M for a total of 8 doses.
Placebo for ARO-APOC3 (Plozasiran) 25 mgPLACEBO_COMPARATORRandomized Period: volume-matched placebo every 3 months (Q3M) for a total of 4 doses. Open-label Period (Parts A and B): plozasiran 25 mg Q3M for a total of 8 doses.
ARO-APOC3 (Plozasiran) 50 mgEXPERIMENTALRandomized Period: plozasiran 25 mg Q3M for a total of 4 doses. Open-label Period: plozasiran 50 mg (Part A), then 25 mg (Part B) Q3M for a total of 8 doses.
Placebo for ARO-APOC3 (Plozasiran) 50 mgPLACEBO_COMPARATORRandomized Period: volume-matched placebo every 3 months (Q3M) for a total of 4 doses. Open-label Period: plozasiran 50 mg (Part A), then 25 mg (Part B) Q3M for a total of 8 doses.

Interventions

NameTypeDescription
PlozasiranDRUGARO-APOC3 injection
PlaceboDRUGsterile normal saline (0.9% NaCl)
Plozasiran InjectionDRUGARO-APOC3 injection
PlacebonDRUGSubcutaneous injection
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites102

Inclusion Criteria: * Males, or nonpregnant (who do not plan to become pregnant) nonlactating females * Established diagnosis of SHTG and prior documented evidence of fasting TG levels of ≥ 880 mg/dL (≥ 10 mmol/L) * Documented evidence of at least 1 prior AP event not attributed to other etiologies...

Countries:United StatesArgentinaAustriaBrazilBulgariaChinaColombiaHungaryJordanMexicoOmanSaudi ArabiaSerbiaSingaporeSouth KoreaSwedenUnited Arab EmiratesUnited KingdomAustraliaBelgiumCanadaCroatiaCzechiaFranceGermanyItalyLatviaLithuaniaNew ZealandPolandRomaniaSlovakiaSouth AfricaSpainIrelandIsraelJapanTurkey (Türkiye)
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Recent Changes (Last 90 Days)

LOWJul 24, 2026NCT06880770lastUpdatePostDate: changed
LOWJul 24, 2026NCT06880770lastUpdatePostDate: changed
LOWJul 15, 2026NCT06347003primaryCompletionDate: changed
LOWJul 15, 2026NCT06347003primaryCompletionDate: changed
LOWJul 14, 2026NCT06822790lastUpdatePostDate: changed
LOWJul 14, 2026NCT06822790lastUpdatePostDate: changed
MEDIUMJul 6, 2026NCT05089084TRIAL_REMOVED: changed
MEDIUMJul 6, 2026NCT05089084TRIAL_REMOVED: changed
MEDIUMJul 6, 2026NCT05089084TRIAL_REMOVED: changed
LOWJun 26, 2026NCT06880770lastUpdatePostDate: changed
LOWJun 26, 2026NCT06347133primaryCompletionDate: changed
LOWJun 26, 2026NCT06880770lastUpdatePostDate: changed
LOWJun 26, 2026NCT06347133primaryCompletionDate: changed
LOWJun 10, 2026NCT06880770lastUpdatePostDate: changed
LOWJun 10, 2026NCT06880770lastUpdatePostDate: changed
HIGHJun 5, 2026NCT05089084Status: ACTIVE_NOT_RECRUITING → COMPLETED
HIGHJun 5, 2026NCT05089084Status: ACTIVE_NOT_RECRUITING → COMPLETED
HIGHJun 5, 2026NCT05089084Status: ACTIVE_NOT_RECRUITING → COMPLETED
HIGHJun 5, 2026NCT05089084Status: ACTIVE_NOT_RECRUITING → COMPLETED
LOWJun 2, 2026NCT06822790lastUpdatePostDate: changed

Frequently asked questions about Plozasiran

What is Plozasiran used for?

Plozasiran is an investigational small molecule being developed for severe hypertriglyceridemia, hypertriglyceridemia, familial chylomicronemia syndrome, and familial chylomicronemia. It is in Phase 3 clinical development and has not been approved by the FDA. The drug has received Breakthrough Therapy designation from the FDA.

How does Plozasiran work?

Plozasiran is a small interfering RNA (siRNA) therapeutic, classified under the -siran target class. It is designed to reduce the production of a protein involved in triglyceride metabolism, thereby lowering triglyceride levels in patients with hypertriglyceridemia and familial chylomicronemia syndrome.

Who is developing Plozasiran?

Plozasiran is being developed by Arrowhead Pharmaceuticals, Inc., a biopharmaceutical company traded on NASDAQ under the ticker ARWR. The company is conducting multiple Phase 3 clinical trials to evaluate the drug's safety and efficacy in patients with severe hypertriglyceridemia and familial chylomicronemia syndrome.

What phase is Plozasiran in?

Plozasiran is in Phase 3 clinical development. It is not FDA approved and remains investigational. The drug has received Breakthrough Therapy designation from the FDA, which is granted to expedite the development and review of drugs for serious conditions where preliminary clinical evidence indicates substantial improvement over available therapies.

What clinical trials is Plozasiran in?

Plozasiran is being studied in four Phase 3 trials. NCT05089084 and NCT05902598 are completed studies in familial chylomicronemia syndrome. NCT06347133 is an active, not recruiting study in hypertriglyceridemia. NCT06822790 is a recruiting long-term safety and efficacy study in hypertriglyceridemia. These trials are randomized, double-blind, and placebo-controlled.

Is Plozasiran the same as Plozasiran Injection?

Yes, Plozasiran is also known as Plozasiran Injection. The drug is referred to by both names in clinical trial documentation and regulatory filings. It is also known by the research codes ARO-APOC3 and VSA001 in some studies, particularly those conducted in Chinese populations.