Extension Study of Sotatercept in People With Pulmonary Hypertension (MK-7962-023) (HARMONIZE)

A Phase 2, Multicenter, Double-blind, Extension Study to Evaluate the Effects of Sotatercept for the Treatment of Combined Postcapillary and Precapillary Pulmonary Hypertension (Cpc-PH) Due to Heart Failure With Preserved Ejection Fraction (HFpEF)

Researchers are looking for new ways to treat people with a type of pulmonary hypertension called combined postcapillary and precapillary pulmonary hypertension (Cpc-PH). This study focuses on Cpc-PH that is caused by heart failure with preserved ejection fraction (HFpEF).

Researchers want to know if the study treatment, sotatercept, can treat people with Cpc-PH caused by HFpEF. This is an extension study, which means people who took part in a certain study on sotatercept for Cpc-PH (called a parent study) may be able to join this study. In this extension study, people will take sotatercept and researchers will follow their health for a longer time.

The main goal of this extension study is to learn about the long-term safety of sotatercept and if people tolerate it over a longer period of time.

Study Overview

• Status: Recruiting
• Conditions: Hypertension, Pulmonary
• Intervention / Treatment: Biological: Sotatercept

• Study Type: Interventional
• Enrollment (Estimated): 130
• Phase: Phase 2

Contacts and Locations

• Study Contact: Name: Toll Free Number; Phone Number: 1-888-577-8839; Email: Trialsites@msd.com

Study Locations

• Belgium
  • Bruxelles-Capitale, Region de
    • Brussels, Bruxelles-Capitale, Region de, Belgium, 1070
      • Active, not recruiting
      • Université Libre de Bruxelles - Hôpital Erasme ( Site 0100)
• Canada
  • Ontario
    • Hamilton, Ontario, Canada, L8L 2X2
      • Active, not recruiting
      • Hamilton Health Sciences Hamilton General Hospital ( Site 0004)
• France
  • Alpes-Maritimes
    • Nice, Alpes-Maritimes, France, 06000
      • Active, not recruiting
      • Centre Hospitalier Universitaire de Nice - Hopital Pasteur ( Site 0206)
  • Herault
    • Montpellier, Herault, France, 34295
      • Active, not recruiting
      • Hopital Arnaud de Villeneuve ( Site 0200)
  • Loire-Atlantique
    • Saint-Herblain, Loire-Atlantique, France, 44800
      • Active, not recruiting
      • Hôpital Nord Guillaume-et-René-Laennec / CHU de Nantes ( Site 0205)
  • Maine-et-Loire
    • Angers, Maine-et-Loire, France, 49100
      • Active, not recruiting
      • Centre Hopitalier Universitaire d'Angers ( Site 0204)
  • Seine-Maritime
    • Rouen, Seine-Maritime, France, 76031
      • Active, not recruiting
      • CHU de Rouen ( Site 0203)
  • Val-de-Marne
    • Le Kremlin-Bicêtre, Val-de-Marne, France, 94270
      • Active, not recruiting
      • Hôpitaux Universitaires Paris Sud - Hôpital Bicêtre ( Site 0202)
• Germany
  • Berlin, Germany, 14050
    • Active, not recruiting
    • DRK Kliniken Berlin Westend ( Site 0307)
  • Baden-Wurttemberg
    • Heidelberg, Baden-Wurttemberg, Germany, 69126
      • Active, not recruiting
      • Thoraxklinik-Heidelberg gGmbH ( Site 0309)
  • Bavaria
    • München, Bavaria, Germany, 80639
      • Active, not recruiting
      • Krankenhaus Neuwittelsbach ( Site 0310)
  • Hesse
    • Giessen, Hesse, Germany, 35392
      • Active, not recruiting
      • UKGM Gießen/Marburg ( Site 0312)
  • North Rhine-Westphalia
    • Cologne, North Rhine-Westphalia, Germany, 50937
      • Active, not recruiting
      • Universitaetsklinikum Koeln ( Site 0311)
  • Rhineland-Palatinate
    • Mainz, Rhineland-Palatinate, Germany, 55131
      • Active, not recruiting
      • Universitätsmedizin Johannes Gutenberg Universität Mainz ( Site 0315)
  • Saxony
    • Dresden, Saxony, Germany, 01307
      • Active, not recruiting
      • Universitaetsklinikum Carl Gustav Carus Dresden ( Site 0301)
• Israel
  • Haifa, Israel, 3109601
    • Active, not recruiting
    • Rambam Health Care Campus ( Site 0403)
  • Holon, Israel, 5810001
    • Active, not recruiting
    • Edith Wolfson Medical Center ( Site 0404)
  • Jerusalem, Israel, 9112001
    • Active, not recruiting
    • Hadassah Medical Center ( Site 0402)
  • Kfar Saba, Israel, 4428164
    • Active, not recruiting
    • Meir Medical Center ( Site 0401)
  • Safed, Israel, 1311001
    • Active, not recruiting
    • ZIV Medical Center ( Site 0400)
• Italy
  • Pavia, Italy, 27100
    • Active, not recruiting
    • Fondazione IRCCS Policlinico San Matteo ( Site 0501)
  • Roma, Italy, 00161
    • Active, not recruiting
    • AOU Policlinico Umberto I ( Site 0500)
  • Lombardy
    • Bergamo, Lombardy, Italy, 24127
      • Active, not recruiting
      • Azienda Socio Sanitaria Territoriale Papa Giovanni XXIII ( Site 0502)
• Mexico
  • Nuevo León
    • Monterrey, Nuevo León, Mexico, 64718
      • Active, not recruiting
      • Unidad de Investigacion Clinica en Medicina, S.C. ( Site 2505)
• Poland
  • Lesser Poland Voivodeship
    • Krakow, Lesser Poland Voivodeship, Poland, 31-202
      • Active, not recruiting
      • Krakowski Szpital Specjalistyczny im. Jana Pawła II-Oddzial Kliniczny Chorob Serca i Naczyn z Podod ( Site 0600)
  • Lublin Voivodeship
    • Lublin, Lublin Voivodeship, Poland, 20-718
      • Active, not recruiting
      • Wojewodzki Szpital Specjalistyczny im Stefana Kardynala Wyszynskiego ( Site 0601)
  • Podlaskie Voivodeship
    • Bialystok, Podlaskie Voivodeship, Poland, 15-276
      • Active, not recruiting
      • Uniwersytecki Szpital Kliniczny w Bialymstoku ( Site 0603)
• Spain
  • Barcelona, Spain, 08036
    • Active, not recruiting
    • Hospital Clinic I Provincial de Barcelona ( Site 0701)
  • Madrid, Spain, 28041
    • Active, not recruiting
    • Hospital Universitario 12 de Octubre ( Site 0702)
  • Seville, Spain, 41009
    • Active, not recruiting
    • Hospital Universitario Virgen Macarena ( Site 0705)
  • Toledo, Spain, 45007
    • Active, not recruiting
    • HOSPITAL GENERAL UNIVERSITARIO DE TOLEDO ( Site 0703)
  • Malaga
    • Marbella, Malaga, Spain, 29603
      • Active, not recruiting
      • Hospital Costa del Sol ( Site 0704)
• Sweden
  • Västra Götaland County
    • Gothenburg, Västra Götaland County, Sweden, 413 46
      • Active, not recruiting
      • Sahlgrenska Universitetssjukhuset-Cardiology Research Unit ( Site 0800)
• United Kingdom
  • London, City of
    • London, London, City of, United Kingdom, W12 OHS
      • Active, not recruiting
      • Hammersmith Hospital-Department of Cardiology ( Site 0900)
• United States
  • Arizona
    • Phoenix, Arizona, United States, 85032
      • Active, not recruiting
      • Pulmonary Associates, PA ( Site 1008)
  • California
    • La Jolla, California, United States, 92037
      • Active, not recruiting
      • Scripps Clinic John R Anderson V Medical Pavillion ( Site 1004)
    • Santa Barbara, California, United States, 93105
      • Active, not recruiting
      • Jeffrey S. Sager, MD Medical Corporation ( Site 1060)
    • Stanford, California, United States, 94305
      • Active, not recruiting
      • Stanford University Medical Center ( Site 1024)
  • Colorado
    • Littleton, Colorado, United States, 80120
      • Active, not recruiting
      • South Denver Cardiology Associates ( Site 1091)
  • Connecticut
    • New Haven, Connecticut, United States, 06520
      • Active, not recruiting
      • Yale New Haven Hospital ( Site 1093)
  • Florida
    • Orlando, Florida, United States, 32803
      • Active, not recruiting
      • AdventHealth Orlando ( Site 1058)
  • Georgia
    • Atlanta, Georgia, United States, 30322
      • Active, not recruiting
      • The Emory Clinic ( Site 1030)
  • Kentucky
    • Louisville, Kentucky, United States, 40202
      • Active, not recruiting
      • Norton Pulmonary Specialists ( Site 1066)
  • Nebraska
    • Omaha, Nebraska, United States, 68198
      • Active, not recruiting
      • University of Nebraska Medical Center ( Site 1053)
  • New York
    • New York, New York, United States, 10065
      • Active, not recruiting
      • Weill Cornell Medical Center ( Site 1046)
  • North Carolina
    • Durham, North Carolina, United States, 27710-4000
      • Recruiting
      • Duke University Medical Center ( Site 1026)
      • Contact: Study Coordinator; Phone Number: 919-681-8439
  • Ohio
    • Cincinnati, Ohio, United States, 45219
      • Active, not recruiting
      • The Carl and Edyth Lindner Center for Research and Education at the Christ Hospital ( Site 1001)
    • Cleveland, Ohio, United States, 44195
      • Active, not recruiting
      • The Cleveland Clinic Foundation. ( Site 1065)
    • Columbus, Ohio, United States, 43210
      • Active, not recruiting
      • The Ohio State University Wexner Medical Center ( Site 1032)
  • Pennsylvania
    • Pittsburgh, Pennsylvania, United States, 15212-4737
      • Active, not recruiting
      • Allegheny General Hospital ( Site 1088)
    • Wynnewood, Pennsylvania, United States, 19096
      • Active, not recruiting
      • Lankenau Medical Center ( Site 1089)
  • Rhode Island
    • Providence, Rhode Island, United States, 02903
      • Active, not recruiting
      • Rhode Island Hospital ( Site 1039)
  • South Carolina
    • Charleston, South Carolina, United States, 29425
      • Active, not recruiting
      • Medical University of South Carolina ( Site 1003)
  • Tennessee
    • Knoxville, Tennessee, United States, 37919
      • Active, not recruiting
      • Statcare Pulmonary Consultants ( Site 1031)
  • Utah
    • Murray, Utah, United States, 84107
      • Active, not recruiting
      • Intermountain Medical Center ( Site 1079)
  • Virginia
    • Falls Church, Virginia, United States, 22042
      • Active, not recruiting
      • Inova Fairfax Medical Campus ( Site 1078)
    • Richmond, Virginia, United States, 23230
      • Active, not recruiting
      • Pulmonary Associates of Richmond - West Broad Street ( Site 1069)

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult; Older Adult
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

The main inclusion criteria include but are not limited to the following:

- Completed MK-7962-007 (CADENCE) (Visit 9 and end of treatment [EOT] visit) without discontinuing study intervention and is able to safely enroll into MK-7962-007 (HARMONIZE)

Exclusion Criteria:

The main exclusion criteria include but are not limited to the following:

• Has a diagnosis of pulmonary hypertension (PH) in world health organization (WHO) Group 1, WHO Group 3, WHO Group 4, or WHO Group 5
• Has had a study intervention interruption
• Is pregnant or breastfeeding
• Has chronic liver disease with severe hepatic impairment and/or cirrhosis (eg, hepatic encephalopathy)
• Anticipation of more than 1 valve replacement or repair (mechanical or biomechanical) and/or have undergone more than 1 valve replacement or repair
• Has severe tricuspid regurgitation due to primary valvular disease (eg, from endocarditis, carcinoid, or mechanical destruction)
• Anticipated or undergone heart transplant or ventricular assist device implantation
• Has had prior exposure to luspatercept

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: Triple

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Sotatercept 0.3 mg/kg; Participants receive sotatercept 0.3 mg/kg subcutaneous (SC) injection every 3 weeks (Q3W) for up to approximately 168 weeks or until discontinuation.	Biological: Sotatercept; subcutaneous injection; Other Names: ACE-011
Experimental: Sotatercept 0.7 mg/kg; Participants receive sotatercept 0.7 mg/kg SC injection Q3W for up to approximately 168 weeks or until discontinuation.	Biological: Sotatercept; subcutaneous injection; Other Names: ACE-011

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Number of Participants Who Experience an Adverse Event (AE)	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.	Up to approximately 187 weeks
Number of Participants Who Discontinue Study Treatment Due to an AE	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.	Up to approximately 168 weeks

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Change From Baseline in Pulmonary Vascular Resistance (PVR) at Week 48	PVR, a hemodynamic variable of pulmonary circulation, is measured by right heart catheterization (RHC). The change from baseline in PVR at Week 48 will be presented.	Baseline and Week 48
Change From Baseline in the 6-Minute Walk Distance (6MWD) at Week 48	The 6MWD tests the distance walked in 6 minutes as a measure of functional capacity. The change from baseline in 6MWD at Week 48 will be presented.	Baseline and Week 48
Change From Baseline in the 6MWD at Week 126	The 6MWD tests the distance walked in 6 minutes as a measure of functional capacity. The change from baseline in 6MWD at Week 126 will be presented.	Baseline and Week 126
Change From Baseline in the 6MWD at Week 174	The 6MWD tests the distance walked in 6 minutes as a measure of functional capacity. The change from baseline in 6MWD at Week 174 will be presented.	Baseline and Week 174
Change From Baseline in New York Heart Association Functional Class (NYHA FC) at Week 48	NYHA FC classifies the extent of heart failure. The change from baseline in NYHA FC at Week 48 will be presented.	Baseline and Week 48
Change From Baseline in NYHA FC at Week 126	NYHA FC classifies the extent of heart failure. The change from baseline in NYHA FC at Week 126 will be presented.	Baseline and Week 126
Change From Baseline in NYHA FC at Week 174	NYHA FC classifies the extent of heart failure. The change from baseline in NYHA FC at Week 174 will be presented.	Baseline and Week 174
Change From Baseline in N-terminal Pro-hormone Brain Natriuretic Peptide (NT-proBNP) at Week 48	NT-proBNP is an established marker of ventricular dysfunction in participants with PAH. NT-proBNP will be measured at baseline and at Week 48. The change from baseline in NT-proBNP at Week 48 will be presented.	Baseline and Week 48
Change From Baseline in NT-proBNP at Week 126	NT-proBNP is an established marker of ventricular dysfunction in participants with PAH. NT-proBNP will be measured at baseline and at Week 126. The change from baseline in NT-proBNP at Week 126 will be presented.	Baseline and Week 126
Change From Baseline in NT-proBNP at Week 174	NT-proBNP is an established marker of ventricular dysfunction in participants with PAH. NT-proBNP will be measured at baseline and at Week 174. The change from baseline in NT-proBNP at Week 174 will be presented.	Baseline and Week 174
Change From Week 24 in PVR at Week 48	PVR, a hemodynamic variable of pulmonary circulation, is measured by right heart catheterization (RHC). The change from Week 24 in PVR at Week 48 will be presented.	Week 24 and Week 48
Change From Week 24 in 6MWD at Week 48	The 6MWD tests the distance walked in 6 minutes as a measure of functional capacity. The change from Week 24 in 6MWD at Week 48 will be presented.	Week 24 and Week 48
Change From Week 24 in NYHA FC at Week 48	NYHA FC classifies the extent of heart failure. The change from Week 24 in NYHA FC at Week 48 will be presented.	Week 24 and Week 48

Collaborators and Investigators

• Sponsor: Merck Sharp & Dohme LLC
• Investigators: Study Director: Medical Director, Merck Sharp & Dohme LLC

Publications and helpful links

Helpful Links

• Merck Clinical Trials Information
• Plain Language Summary

Study record dates

Study Major Dates

• Study Start (Actual): April 16, 2025
• Primary Completion (Estimated): August 10, 2035
• Study Completion (Estimated): August 10, 2035

Study Registration Dates

• First Submitted: February 3, 2025
• First Submitted That Met QC Criteria: February 3, 2025
• First Posted (Actual): February 7, 2025

Study Record Updates

• Last Update Posted (Actual): May 26, 2026
• Last Update Submitted That Met QC Criteria: May 22, 2026
• Last Verified: May 1, 2026

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Vascular Diseases; Cardiovascular Diseases; Respiratory Tract Diseases; Lung Diseases; Hypertension; Hypertension, Pulmonary; ACE-011
• Other Study ID Numbers: 7962-023; MK-7962-023 (Other Identifier: MSD); U1111-1309-2142 (Registry Identifier: UTN); 2024-515773-99-00 (Registry Identifier: EU CT)

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: YES
• IPD Plan Description: https://trialstransparency.msdclinicaltrials.com/pdf/ProcedureAccessClinicalTrialData.pdf

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: Yes
• Studies a U.S. FDA-regulated device product: No