Clinical trial Recruiting at 3 sites Phase 2 Interventional Ages 1 Year to 17

Sotatercept in Japanese children with pulmonary arterial hypertension

Official title: A Phase 2 Open-label Study to Evaluate the Safety, Tolerability, Pharmacokinetics, and Efficacy of Sotatercept (MK-7962) in Japanese Children From 1 to Less Than 18 Years of Age With PAH on Standard of Care.

Run by Merck Sharp & Dohme LLC · NCT07646860 · Data updated 2026-11-12

This study tests whether sotatercept is safe and well tolerated in Japanese children with PAH when added to standard PAH treatment.

Quick facts

PhasePhase 2
Study typeInterventional
Ages1 Year to 17 Years
SexAll
Enrollment6 (estimated)
SponsorMerck Sharp & Dohme LLC
Industry-sponsored
Locations3 sites (Izumi, Osaka and 2 other locations)
StatusRecruiting
StartedSeptember 17, 2026
Main results expectedMay 24, 2029
Study endsMay 16, 2031
Registry record updatedOctober 6, 2026
Trial IDNCT07646860 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Ideal candidates are Japanese children with confirmed PAH (WHO Group 1), WHO FC I–IV, on stable standard PAH therapy for at least 90 days, and eligible by the study’s criteria.

Probably not a fit

Patients with certain heart or lung structure abnormalities or recent high-risk procedures may not benefit and could be excluded from participation.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This Phase 2 interventional study investigates the safety and pharmacokinetics of sotatercept (MK-7962) in Japanese children with World Health Organization Group 1 PAH, alongside their usual PAH therapy. Participants will be Japanese children with PAH who have been on stable background therapy for at least 90 days. The study aims to understand how the drug behaves in the body and whether it reduces pulmonary vascular resistance. Enrollment is limited to specific Osaka and Tokyo area centers collaborating with Merck Sharp & Dohme LLC.

Why it matters

Potential benefit: If successful, participants may experience improved lung blood vessel function and symptom relief when sotatercept is added to standard PAH treatment.

How similar studies have gone: Prior studies using sotatercept in PAH populations have shown potential safety and pharmacodynamic effects, but pediatric data in Japan are investigational and this study adds new population-specific insight.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

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

* Has pulmonary arterial hypertension (PAH, World Health Organization Group 1) confirmed by a prior right heart catheterization
* Has idiopathic, heritable, drug- or toxin-induced PAH, connective tissue disease-associated PAH, repaired congenital heart disease-associated PAH, or PAH with coincidental shunt
* Has PAH classified as World Health Organization Functional Class I, or symptomatic World Health Organization Functional Class II to IV
* Has been receiving stable standard-of-care background therapy for PAH for at least 90 days
* Is Japanese

Exclusion Criteria:

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

* History of left-sided heart disease
* Has severe congenital or developmental abnormalities of the lung, thorax, and/or diaphragm
* History of Eisenmenger syndrome, Potts shunt, or recent atrial septostomy within 180 days
* Has unrepaired or residual cardiac shunt with Qp/Qs \>1.5
* Has pulmonary veno-occlusive disease, pulmonary capillary hemangiomatosis, or overt signs of pulmonary capillary and/or venous involvement
* PAH associated with portal hypertension
* Known visceral arteriovenous malformations
* History of full or partial pneumonectomy
* Untreated more than mild obstructive sleep apnea
* History of known pericardial constriction
* Family history of sudden cardiac death or long QT syndrome
* History of symptomatic coronary disease within 6 months or cerebrovascular accident within 3 months
* Prior treatment with sotatercept or luspatercept

Where it's running

  • Osaka Prefectural Hospital Organization Osaka Women's and Children's Hospital ( Site 3203)
    Izumi, Osaka, Japan
    Recruiting
  • The University of Osaka Hospital ( Site 3201)
    Suita, Osaka, Japan
    Recruiting
  • National Center for Child Health and Development ( Site 3202)
    Setagaya City, Tokyo, Japan
    Recruiting

Study contacts

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.