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Sotatercept

Phase 4FDA approved 2024

Pulmonary Arterial Hypertension | Monoclonal antibody | Cardiovascular |Merck & Company, Inc.|Trials Updated: Oct 8, 2026

Sotatercept development status

FDA approval Mar 26, 2024 as Winrevair
Approval holderMerck Sharp Dohme
ApplicationBLA761363
Highest phase Phase 4 (NCT07140484)
Phase scored for MRKPhase 3
Registered trials 24 across 4 sponsors since Sep 2008

Label indication WINREVAIR™ is indicated for the treatment of adults with pulmonary arterial hypertension (PAH, Group 1 pulmonary hypertension) to improve exercise capacity and World Health Organization (WHO) functional class (FC), and reduce the risk of clinical worsening events including hospitalization for PAH, lung transplantation and death [see Clinical Studies (14.1) ] . FDA label

Sotatercept target and mechanism

Molecular targetINHBA
Target classInhibitor
ModalityMonoclonal antibody

Also known as MK-7962, WINREVAIR™, ACE-011, ActRIIA-IgG1Fc

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindCONTROLLEDDMC
Total Trials14
Total Enrollment2,858

FDA Designations

No designations recorded

Sotatercept clinical trials

Sotatercept · 14 trials · 9 indications

Phase 3 5Phase 2 9
NCT07839585A Clinical Study of Sotatercept (MK-7962) in People With Combined Postcapillary and Precapillary Pulmonary Hypertension and Heart Failure With Preserved Ejection Fraction (MK-7962-041)Pulmonary Hypertension
NOT YET_RECRUITING352 Analytics
NCT05818137A Study of Sotatercept in Japanese Pulmonary Arterial Hypertension (PAH) Participants (MK-7962-020)Pulmonary Arterial Hypertension
COMPLETED46 Analytics
NCT04896008A Study of Sotatercept in Participants With PAH WHO FC III or FC IV at High Risk of Mortality (MK-7962-006/ZENITH)Pulmonary Arterial Hypertension
COMPLETED173 Analytics
NCT07218029A Clinical Study of Sotatercept (MK-7962) in People With Pulmonary Arterial Hypertension (MK-7962-038)Pulmonary Arterial Hypertension
ACTIVE NOT_RECRUITING815 Analytics
NCT04576988A Study of Sotatercept for the Treatment of Pulmonary Arterial Hypertension (MK-7962-003/A011-11)(STELLAR)Pulmonary Arterial Hypertension
COMPLETED324 Analytics
PHASE3NOT YET_RECRUITING
A Clinical Study of Sotatercept (MK-7962) in People With Combined Postcapillary and Precapillary Pulmonary Hypertension and Heart Failure With Preserved Ejection Fraction (MK-7962-041)
Pulmonary HypertensionUnlock trial analytics
PHASE3COMPLETED
A Study of Sotatercept in Japanese Pulmonary Arterial Hypertension (PAH) Participants (MK-7962-020)
Pulmonary Arterial HypertensionUnlock trial analytics
PHASE3COMPLETED
A Study of Sotatercept in Participants With PAH WHO FC III or FC IV at High Risk of Mortality (MK-7962-006/ZENITH)
Pulmonary Arterial HypertensionUnlock trial analytics
PHASE3ACTIVE NOT_RECRUITING
A Clinical Study of Sotatercept (MK-7962) in People With Pulmonary Arterial Hypertension (MK-7962-038)
Pulmonary Arterial HypertensionUnlock trial analytics
PHASE3COMPLETED
A Study of Sotatercept for the Treatment of Pulmonary Arterial Hypertension (MK-7962-003/A011-11)(STELLAR)
Pulmonary Arterial HypertensionUnlock trial analytics

Study Endpoints

Primary Endpoints

Time to Clinical Worsening (TTCW)
Up to ~37 months

TTCW was defined as time to first occurrence of any of the following events: cardiovascular (CV) death, hospitalization due to worsening heart failure (HF) or pulmonary hypertension (PH), urgent visits due to worsening HF or PH, or deterioration in exercise capacity (≥15% decrease from baseline in 6-minute walk distance \[6MWD\], confirmed by 2 tests) due to worsening HF or PH. CV deaths are defined as any deaths with a primary CV cause, including acute myocardial infarction (MI), sudden cardiac death, HF, PH worsening, stroke, and other CV causes.

Change From Pulmonary Vascular Resistance (PVR) From Baseline at Week 24
Baseline and Week 24

PVR was the resistance against blood flow from the pulmonary artery to the left atrium. PVR was measured in dyn\*sec/cm\^5 by right heart catheterization (RHC). RHC was performed during the screening period (baseline) and Week 24. Per protocol, the change in PVR from baseline at Week 24 was reported for the primary treatment period.

Number of Participants Who Experienced an Adverse Event (AE)
Up to ~24 weeks

An AE was any untoward medical occurrence in a participant, temporally associated with the use of study treatment, whether or not considered related to the study treatment. Per protocol, the number of participants who experienced an AE were reported for the primary treatment period.

Number of Participants Who Discontinued Study Intervention Due to AEs
Up to ~24 weeks

An AE was any untoward medical occurrence in a participant, temporally associated with the use of study treatment, whether or not considered related to the study treatment. Per protocol, the number of participants who discontinued study treatment due to AEs were reported for the primary treatment period.

Time to First Confirmed Morbidity or Mortality Event
Up to approximately 31 months

Morbidity or mortality events were defined as all-cause death, lung transplantation, or PAH worsening-related hospitalization of ≥24 hours. All events were adjudicated by a blinded, independent committee of clinical experts. Only adjudication-confirmed lung transplantation and PAH worsening-related hospitalization of ≥24 hours were included in the primary analysis. All deaths that are a first event for a participant were included regardless of adjudication. The time from randomization to the first confirmed morbidity or mortality event, calculated using the non-parametric Kaplan-Meier method, is presented.

Number of Participants Who Experience an Adverse Event (AE)
Up to approximately 90 months

An AE is any untoward medical occurrence in a clinical study participant, temporally associated with the use of study intervention, whether or not considered related to the study intervention. The number of participants who experience an AE will be reported.

Number of Participants Who Discontinue Study Treatment Due to an AE
Up to approximately 86 months

An AE is any untoward medical occurrence in a clinical study participant, temporally associated with the use of study intervention, whether or not considered related to the study intervention. The number of participants who discontinue study treatment due to an AE will be reported.

Number of Participants with Detectable Anti-Drug Antibodies (ADAs)
Up to approximately 88 months

ADAs will be detected in serum. The number of participants with detectable ADAs will be reported.

Laboratory parameters (Hematology): Concentration of Platelets and Hemoglobin
Up to approximately 88 months

Blood samples will be collected to determine the concentration of platelets and hemoglobin.

Laboratory parameters (Chemistry): Concentration of Creatinine, Total Bilirubin, and Alanine Aminotransferase (ALT)
Up to approximately 86 months

Blood samples will be collected to determine the concentration of creatinine, total bilirubin, and ALT.

Change From Baseline in Body Weight
Baseline and up to approximately 86 months

Change from baseline in body weight will be reported.

Change From Baseline in Blood Pressure
Baseline and up to approximately 86 months

Change from baseline in systolic and diastolic blood pressure will be reported.

Change From Baseline in Electrocardiogram (ECG)
Baseline and up to approximately 86 months

Change from baseline in ECG (12-lead) for the determination of Fridericia's corrected QT interval (QTcF) will be reported.

Change From Baseline in 6-Minute Walk Distance (6MWD) at Week 24
Baseline and Week 24

The 6MWD was the distance walked in 6 minutes as a measure of functional capacity. This was assessed using the 6-minute walk test (6MWT). Per protocol, change from baseline in 6MWD at Week 24 was reported for DBPC period.

Number of Participants Who Discontinued Study Treatment Due to an AE
Up to approximately 24 weeks

An AE was any untoward medical occurrence in a study participant administered a study drug, which did not necessarily have a causal relationship with this treatment. An AE can therefore be any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease temporally associated with the use of the study drug whether or not it was considered related to the study drug. Per protocol, the number of participants who discontinued study treatment due to an AE were reported for DBPC period.

Number of Participants With One or More Adverse Events
Up to approximately 24 weeks

An adverse event is any untoward medical occurrence in a clinical study participant, temporally associated with the use of study intervention, whether or not considered related to the study intervention.

Number of Participants Who Discontinue Study Intervention Due to an Adverse Event
Up to approximately 24 weeks

An adverse event is any untoward medical occurrence in a clinical study participant, temporally associated with the use of study intervention, whether or not considered related to the study intervention.

Laboratory Parameter (Hematology): Concentration of Hemoglobin
Up to approximately 24 weeks

Hematological parameters will be investigated in blood samples from participants by means of clinical laboratory assays and evaluated by the investigator. The concentration of hemoglobin will be presented.

Laboratory Parameter (Hematology): Hematocrit
Up to approximately 24 weeks

Hematological parameters will be investigated in blood samples from participants by means of clinical laboratory assays and evaluated by the investigator. The hematocrit will be presented.

Laboratory Parameter (Hematology): Red Blood Cell (RBC) Count
Up to approximately 24 weeks

Hematological parameters will be investigated in blood samples from participants by means of clinical laboratory assays and evaluated by the investigator. The RBC count will be presented.

Laboratory Parameter (Hematology): Reticulocyte Count
Up to approximately 24 weeks

Hematological parameters will be investigated in blood samples from participants by means of clinical laboratory assays and evaluated by the investigator. The reticulocyte count will be presented.

Laboratory Parameter (Hematology): Platelet Count
Up to approximately 24 weeks

Hematological parameters will be investigated in blood samples from participants by means of clinical laboratory assays and evaluated by the investigator. The platelet count will be presented.

Blood Pressure (BP)
Up to approximately 24 weeks

BP will be assessed while the participant was seated after a period of rest in a quiet setting with no distractions (eg, television and cell phones).

Number of Participants with Detectable Neutralizing Antibodies to Sotatercept
Up to approximately 24 weeks

Neutralizing antibody analysis will be performed on blood samples for participants who are confirmed as antidrug antibody-positive. The number of participants with detectable neutralizing antibodies at any time during the study will be presented.

Serum Trough Concentration (Ctrough) of Sotatercept
At designated time points and up to approximately 24 weeks

Serum samples collected predose will be used to determine serum trough concentration (Ctrough) of sotatercept.

Change From Baseline in Pulmonary Vascular Resistance Index (PVRI)
Baseline and Week 24

The change from baseline in PVRI will be presented.

Number of Participants Who Experience One or More Adverse Events (AEs)
Up to approximately 28 months

An AE is any untoward medical occurrence in a clinical study participant, temporally associated with the use of study intervention, whether or not considered related to the study intervention. The number of participants who experience an AE will be reported.

Number of Participants who Discontinue Study Intervention Due to an AE
Up to approximately 24 months

An AE is any untoward medical occurrence in a clinical study participant, temporally associated with the use of study intervention, whether or not considered related to the study intervention. The number of participants who discontinue study intervention due to an AE will be reported.

Steady-State Average Serum Concentrations of Sotatercept (Cavg)
Predose and at designated time points post-dose (up to 24 weeks)

Steady-state Cavg of sotatercept will be reported.

Number of Participants who Discontinue Study Treatment due to an Adverse Event
Up to 21 weeks

An AE is a health problem that happens or worsens during a study. Number of participants who discontinue study treatment will be reported.

Area Under the Curve at Steady State (AUCss) of Sotatercept
Predose Day 1, Day 21, Day 42, Day 63, Day 84, Day105, Day 126, Day 147, Day 168, Day 189. Postdose Day 7, Day 14, Day 64, Day 69 and Day 76

Blood samples will be collected at multiple time points to estimate the AUCss of Sotatercept.

Area Under the Curve from 0 to 3 weeks (AUC0-3 weeks) of Sotatercept
Predose Day 1, Day 7, Day 14, and Predose Day 21

Blood samples will be collected at Predose Day 1, Day 7, Day 14, and Predose Day 21 to estimate the AUC0-3 weeks of Sotatercept.

Percentage of Participants Who Experience at Least 1 Adverse Event (AE)
Up to 24 weeks

An AE is any unfavourable and unintended sign, symptom, or disease temporally associated with the use of a medicinal product or protocol-specified procedure, whether or not considered related to the medicinal product or protocol-specified procedure. Any worsening of a preexisting condition considered related to the medicinal product or protocol-specified procedure. Any worsening of a preexisting condition that is temporally associated with the use of the Sponsor's product, is also an AE. The percentage of participants with 1 or more AEs will be assessed.

Percentage of Participants Who Discontinue Study Drug Due to an AE
Up to 24 weeks

An AE is any unfavourable and unintended sign, symptom, or disease temporally associated with the use of a medicinal product or protocol-specified procedure, whether or not considered related to the medicinal product or protocol-specified procedure. Any worsening of a preexisting condition considered related to the medicinal product or protocol-specified procedure. Any worsening of a preexisting condition that is temporally associated with the use of the Sponsor's product, is also an adverse event. The percentage of participants who discontinued the study drug due to an AE regardless of study completion status will be assessed.

Titer of Anti-drug Antibody (ADA) to Sotatercept
Up to 24 weeks

ADA to Sotatercept will be assessed.

Base Study: Change From Baseline in Pulmonary Vascular Resistance (PVR) at Week 24
Baseline and Week 24

PVR, a hemodynamic variable of pulmonary circulation, was measured by right heart catheterization (RHC). Participants missing a value at baseline were excluded from the analysis. Participants missing a value at Week 24 (other than death or experienced a clinical worsening event), multiple imputation was used to impute missing data. Participants who died, the worst-rank score was assigned. Participants missing a value at Week 24 due to a clinical worsening event, the next-worst-rank score was used. The 'Full Range' is the minimum and maximum of the 100 medians from the 100 imputed datasets.

Change From Baseline in Peak Oxygen Uptake (VO2 Max) at 24 Weeks
Baseline and 24 weeks

Each participant's VO2 max was measured by an invasive cardiopulmonary exercise test (iCPET) at baseline and at 24 weeks.

Base Study: Change From Baseline in Pulmonary Vascular Resistance (PVR) at 24 Weeks
Baseline and 24 weeks

Each participant's PVR, at resting supine, was measured by right heart catheterization at baseline and at 24 weeks.

Extension Period: Change From Baseline in PVR (Delayed-Start Analysis)
Baseline and timepoint at which third right heart catheterization was performed, which occurred between Month 18 and Month 24

Each participant's PVR, at resting supine, was measured by right heart catheterization at baseline and the timepoint at which the third right heart catheterization was performed, which occurred between Month 18 and Month 24.

Extension Period: Change From Baseline in PVR (Placebo-Crossed Analysis)
Baseline and the timepoint at which the third right heart catheterization was performed, which occurred between Month 18 and Month 24.

Each participant's PVR, at resting supine, was measured by right heart catheterization at baseline and the timepoint at which the third right heart catheterization was performed, which occurred between Month 18 and Month 24.

Extension Period: Number of Participants Who Experienced One or More Adverse Events (AEs)
Up to approximately 32 months

An AE is any untoward medical occurrence in a study participant administered a pharmaceutical product that does not necessarily have to have a causal relationship with this treatment. An AE can therefore be any unfavorable and unintended sign, symptom, or disease temporally associated with the use of a medicinal product, whether or not related to the medicinal product.

Extension Period: Number of Participants Who Discontinued Study Treatment Due to an AE
Up to 30 months

An AE is any untoward medical occurrence in a study participant administered a pharmaceutical product that does not necessarily have to have a causal relationship with this treatment. An AE can therefore be any unfavorable and unintended sign, symptom, or disease temporally associated with the use of a medicinal product, whether or not related to the medicinal product.

Percentage of Participants With Erythroid Hematological Improvement (HI-E) Starting Before the Completion of Five Cycles of Treatment (Responder Rate)
Day 2 to Day 142

The responder rate includes non-transfusion dependent efficacy (NTDE) participants and transfusion dependent efficacy (TDE) participants. For non-transfusion dependence efficacy (NTDE) participants who required \< 4 units of RBCs in the 8 weeks prior to start of therapy, HI-E was defined as an increase of \>=1.5 g/dL hemoglobin sustained for 56 days over a period of \>=8 weeks. For transfusion dependence efficacy (TDE) participants who required \>=4 units of RBCs in the 8 weeks prior to start of therapy, HI-E was defined as a decrease of \>= 4 units of RBCs transfused sustained for 56 days over a period of 8 weeks.

Secondary Endpoints

Time to First Event of CV Death, Hospitalization Due to Worsening HF or PH, or Urgent Visit Due to Worsening HF or PH
Up to ~37 months
Time to First Event of CV Death or Hospitalization Due to Worsening HF or PH
Up to ~37 months
Change From Baseline in 6MWD at Week 24
Baseline and Week 24
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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
SotaterceptEXPERIMENTALParticipants will receive sotatercept via subcutaneous (SC) injection every 3 weeks at an initial dose of 0.3 mg/kg until end of study (up to approximately 37 months).
PlaceboPLACEBO_COMPARATORParticipants will receive matching placebo via SC injection every 3 weeks until end of study (up to approximately 37 months).
Sotatercept plus background PAH therapyEXPERIMENTALSotatercept at a starting dose of 0.3 mg/kg with a target dose of 0.7 mg/kg administered subcutaneously (SC) every 21 days plus background PAH therapy
Placebo plus background PAH therapyPLACEBO_COMPARATORPlacebo administered (SC) every 21 days plus background PAH therapy
Weight-banded sotatercept dosingEXPERIMENTALParticipants will receive sotatercept via subcutaneous (SC) injection every 3 weeks at an initial dose of up to 45 mg and then at a maintenance dose of up to 90 mg using a weight-banded method and will continue treatment for up to 24 months. All eligible participants will receive weight-banded dosing at the dosing level (initial or maintenance) at which they finished MK-7962-024 (LIGHTRAY). Participants will continue to take their background PAH therapy during the study.
Sotatercept 0.3 mg/kgEXPERIMENTALParticipants receive sotatercept 0.3 mg/kg subcutaneous (SC) injection every 3 weeks (Q3W) for up to approximately 10 years or until discontinuation.
Sotatercept 0.7 mg/kgEXPERIMENTALParticipants receive sotatercept 0.7 mg/kg SC injection Q3W for up to approximately 10 years or until discontinuation.
Weight-based sotatercept dosingEXPERIMENTALParticipants will receive sotatercept via subcutaneous (SC) injection every 3 weeks at an initial dose of 0.3 mg/kg and then at a maintenance dose of 0.7 mg/kg using a weight-based method during a 24-week treatment period. Participants will continue to take their background PAH therapy during the study.
Children ≥1 to <18 years oldEXPERIMENTALParticipants will receive a subcutaneous (SC) injection every 3 weeks (Q3W) of 0.3 mg/kg. Dosage may be adjusted based on protocol-specific guidelines.
Sotatercept 0.3 mg/kg, escalating to 0.7 mg.kgEXPERIMENTALSotatercept SC at a starting dose level of 0.3 mg/kg for 3 dosing visits (Q3W), then escalating to 0.7 mg/kg SC on the fourth dosing visit and Q3W for the remainder of the 24-week treatment Period.
Sotatercept 0.1 mg/kgEXPERIMENTALSotatercept 0.1 mg/kg
Sotatercept 0.5 mg/kgEXPERIMENTALSotatercept 0.5 mg/kg
Sotatercept 1.0 mg/kgEXPERIMENTALSotatercept 1.0 mg/kg
Sotatercept 1.5 mg/kgEXPERIMENTALSotatercept 1.5 mg/kg
Sotatercept 2.0 mg/kgEXPERIMENTALSotatercept 2.0 mg/kg

Interventions

NameTypeDescription
SotaterceptBIOLOGICALSC injection administered every 3 weeks.
PlaceboBIOLOGICALSC injection administered every 3 weeks.
Background PAH TherapyDRUGBackground PAH therapy may consist of the following drug classes: an endothelin-receptor antagonist (ERA), a phosphodiesterase 5 (PDE5) inhibitor, a soluble guanylate cyclase stimulator, and/or a prostacyclin analogue or receptor agonist.
Sotatercept 0.3 mg/kgDRUGAdministered by subcutaneous injection. Sotatercept (ACE-011) is a recombinant fusion protein consisting of the extracellular domain of the human activin receptor type IIA linked to the Fc piece of human IgG1.
Sotatercept 0.3 mg/kg escalating to 0.7 mg/kgDRUGAdministered by subcutaneous injection. Sotatercept (ACE-011) is a recombinant fusion protein consisting of the extracellular domain of the human activin receptor type IIA linked to the Fc piece of human IgG1.
SOCOTHERSOC therapy refers to combination therapy consisting of drugs from two or more of the following drug classes: an endothelin-receptor antagonist (ERA), a phosphodiesterase 5 (PDE5) inhibitor, a soluble guanylate cyclase stimulator, and/or a prostacyclin analogue or receptor agonist.
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Eligibility Criteria

Age Range18 Years to 85 Years
SexALL
Healthy VolunteersNo

Inclusion Criteria: The main inclusion criteria include but are not limited to the following: * Has clinical diagnosis of HF with preserved ejection fraction on optimized guideline-directed medical therapy * Has CpcPH confirmed by right-heart catheterization * Has NYHA FC II or III Exclusion Crit...

Countries:JapanUnited StatesAustraliaBelgiumCanadaFranceGermanyIsraelItalyMexicoNetherlandsSpainUnited KingdomArgentinaBrazilColombiaCroatiaCzechiaDenmarkGreeceNew ZealandPolandPortugalSerbiaSouth KoreaSwedenSwitzerlandTaiwanChinaHungarySingaporeThailandSouth AfricaTurkey (Türkiye)
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Recent Changes (Last 90 Days)

MEDIUMOct 8, 2026NCT07218029Status: RECRUITING → ACTIVE_NOT_RECRUITING
MEDIUMOct 8, 2026NCT07218029Status: RECRUITING → ACTIVE_NOT_RECRUITING
LOWOct 6, 2026NCT07646860startDate: changed
LOWOct 6, 2026NCT07839585lastUpdatePostDate: changed
LOWOct 6, 2026NCT07646860startDate: changed
LOWOct 6, 2026NCT07839585lastUpdatePostDate: changed
LOWOct 1, 2026NCT07218029lastUpdatePostDate: changed
LOWOct 1, 2026NCT07218029lastUpdatePostDate: changed
LOWSep 24, 2026NCT07839585NEW_TRIAL: changed
LOWSep 24, 2026NCT07839585NEW_TRIAL: changed
LOWSep 22, 2026NCT07218029lastUpdatePostDate: changed
LOWSep 22, 2026NCT07218029lastUpdatePostDate: changed
LOWSep 9, 2026NCT07646860startDate: changed
LOWSep 9, 2026NCT07218029lastUpdatePostDate: changed
LOWSep 9, 2026NCT07646860startDate: changed
LOWSep 9, 2026NCT07218029lastUpdatePostDate: changed
LOWAug 31, 2026NCT07218029lastUpdatePostDate: changed
LOWAug 31, 2026NCT07218029lastUpdatePostDate: changed

Frequently asked questions about Sotatercept

What is sotatercept used for?

Sotatercept is being studied for pulmonary arterial hypertension, pulmonary hypertension, and anemia. It is an investigational therapy in clinical development and is not described as approved. Development covers adult and pediatric populations, including a Phase 3 study in combined postcapillary and precapillary pulmonary hypertension with heart failure with preserved ejection fraction.

What does sotatercept target?

Sotatercept targets INHBA and acts as an inhibitor. INHBA is part of the activin signaling pathway, and inhibiting this target is the mechanism under study in the conditions being evaluated. The program is listed with a small molecule modality.

Who makes sotatercept?

Sotatercept is developed by Merck & Company, Inc., which trades under the ticker MRK. The company is running the clinical program, including studies labeled MK-7962, across pulmonary hypertension and anemia indications.

What phase is sotatercept in?

Sotatercept is in Phase 2 development overall, with individual trials spanning Phase 2 and Phase 3. Ten trials are listed in total: four active and six completed, with 1,827 participants enrolled across the program. It is investigational and not described as approved.

What clinical trials is sotatercept in?

Sotatercept trials include NCT07839585, a Phase 3 study in combined postcapillary and precapillary pulmonary hypertension with heart failure with preserved ejection fraction; NCT07646860, a Phase 2 study in Japanese children with pulmonary arterial hypertension; NCT07218029, a Phase 3 study in pulmonary arterial hypertension; and NCT06925750, the Phase 2 LIGHTRAY extension study.