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Pulmonary Arterial Hypertension (PAH)Phase 1/2SOFAPINCT07357974

Impact of Sotatercept on Pulmonary Artery and Right Ventricle Remodeling Imaging Assessed With 68Ga-FAPI PET/CT in Patients With PAH

A Phase 1/2 study testing [68Ga]Ga-FAPI PET/CT and [68Ga]Ga-MAA PET/CT in people with Pulmonary Arterial Hypertension (PAH), run by University Hospital, Brest at 1 site in France.

Not yet recruiting

Opening soon. The study is approved but enrolment has not started yet. Sites may already take enquiries.

Sites and contacts
Official record
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Trial summary

Pulmonary arterial hypertension (PAH) is a rare, progressive disease characterized by structural changes in the pulmonary arteries, leading to increased pulmonary vascular resistance and elevated pulmonary arterial pressure and, if untreated, right heart failure. Read more about this study

Who is it for?
Ages 18 years and older
Conditions the study is for
Pulmonary Arterial Hypertension (PAH)
What is being tested?
[68Ga]Ga-FAPI PET/CT and [68Ga]Ga-MAA PET/CT
Could I receive a placebo?
No, everyone receives an active treatment
How many people
15 participants
Where
1 siteFrance
Study dates
15 Jul 2026to 1 Jan 2028
Phase
Phase 1/2
Are there results?
Not yet: the study is under way

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 years and older
  • All sexes
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • Age ≥ 18 years
  • Documented diagnostic right heart catheterization (RHC) within 12 months of screening documenting a minimum PVR of ≥ 4 Wood units and pulmonary capillary wedge pressure (PCWP) or left ventricular end-diastolic pressure (LVEDP) of ≤ 15 mmHg, with the diagnosis of WHO PAH Group 1 in any of the following subtypes:
  • Idiopathic PAH
  • Heritable PAH
  • Drug/toxine-induced PAH
  • PAH associated with connective tissue disease
Show all 12Show fewer
  • PAH associated with simple, congenital systemic-to- pulmonary shunts at least 1year following repair
  • Patients under bi or tri-background-therapy
  • Symptomatic PAH classified WHO FC II or III
  • Patients will be started on Sotatercept
  • Ability to adhere to study visit schedule and understand and comply with all the protocol requirement.
  • Ability to understand and provide written informed consent

Who cannot join

  • Diagnosis of PH WHO Groups 2, 3, 4, or 5
  • Diagnosis of the following PAH Group 1 subtypes: human immunodeficiency virus (HIV)-associated PAH, PAH associated with portal hypertension, schistosomiasis associated PAH, pulmonary veno occlusive disease and pulmonary capillary hemangiomatosis.
  • Hemoglobin at screening above gender-specific ULN, per local laboratory test
  • Pregnant or breastfeeding women
  • Any of the following clinical laboratory values at the Screening visit:
  • eGFR < 30 mL/min/1.73 m2 (as defined by MDRD equation)
Show all 9Show fewer
  • Serum alanine aminotransferase (ALT), aspartate aminotransferase (AST), or total bilirubin levels > 3 × ULN
  • Platelet count < 50,000/mm3 (< 50.0 × 109/L)
  • Known allergic reaction to sotatercept (ACE-011), its excipients, or luspatercept

Trial locations and contacts

1 site in 1 country. Contact the study team or a site near you to ask about taking part.

France1 site
  • Chu Brest

    Brest, Finistere, 29200

    cecile Tromeur

Other trials in France

About this study

Official title: Impact of Sotatercept on Pulmonary Artery and Right Ventricle Remodeling Imaging Assessed With 68Ga-FAPI PET/CT in Patients With PAH: a Pilot Study

Pulmonary arterial hypertension (PAH) is a rare, progressive disease characterized by structural changes in the pulmonary arteries, leading to increased pulmonary vascular resistance and elevated pulmonary arterial pressure and, if untreated, right heart failure. Diagnosis requires a comprehensive evaluation, including right heart catheterization performed in specialized centers.

Despite advances in the understanding and management of the disease, PAH remains a severe condition. Current approved therapies primarily target three key pathways involved in endothelial dysfunction: the endothelin, nitric oxide, and prostacyclin pathways. Pulmonary arterial remodeling is characterized by alterations in endothelial cells, smooth muscle cells, and fibroblasts, with fibroblast activation and macrophage involvement contributing to disease progression.

Read more

Two positron emission tomography/computed tomography (PET/CT) imaging approaches are currently under investigation in PAH. [⁶⁸Ga]Ga-FAPI PET/CT targets activated fibroblasts and enables noninvasive assessment of fibroblast activity and tissue remodeling. [⁶⁸Ga]Ga-MAA lung perfusion PET/CT is an emerging imaging technique that provides higher spatial resolution and sensitivity than conventional lung perfusion imaging and allows evaluation of regional pulmonary perfusion.

Sotatercept is a novel fusion protein that modulates signaling within the transforming growth factor-beta (TGF-β) superfamily by binding select ligands involved in vascular remodeling. Its mechanism of action is distinct from that of currently approved PAH therapies. Sotatercept has been evaluated in clinical development programs, including the PULSAR and STELLAR studies. Reported adverse events include epistaxis, dizziness, increased hemoglobin levels, and changes in blood pressure.

This study is designed with the following objectives:

Primary objective: To assess pulmonary vascular remodeling in patients with PAH using [⁶⁸Ga]Ga-FAPI PET/CT imaging.

Secondary objectives: To evaluate [⁶⁸Ga]Ga-FAPI uptake and regional lung perfusion using [⁶⁸Ga]Ga-MAA lung perfusion PET/CT imaging at predefined study time points.

Being tested
[68Ga]Ga-FAPI PET/CT, [68Ga]Ga-MAA PET/CT
Keywords
[68Ga]Ga-FAPI PET/CT (FAPI), [68Ga]Ga-MAA lung perfusion PET/CT
Medical subject headings
Pulmonary Arterial Hypertension

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • [68Ga]Ga-FAPI PET/CTDiagnostic test

    [68Ga]Ga-FAPI PET/CT

  • [68Ga]Ga-MAA PET/CTDiagnostic test

    [68Ga]Ga-MAA PET/CT

Study groups in NCT07357974
Study groupRoleWhat they receive
PET/CTExperimentalNot described
Receives: Diagnostic Test: [68Ga]Ga-FAPI PET/CT; Diagnostic Test: [68Ga]Ga-MAA PET/CT

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Vascular remodeling as assessed by [68Ga] Ga-FAPI uptake of pulmonary arteries on PET/CT imaging.

    A positive uptake will be defined as a ratio of the Standardized uptake value (SUV) max of the pulmonary arteries and the SUVmean of the vascular background activity measured at the center of the left ventricle greater than 1.5.

    Measured: at baseline

Secondary outcomes (23)
  1. Change from baseline in [68Ga] Ga-FAPI uptake on pulmonary arteries as assessed by SUVmax at 24 weeks.

    [68Ga] Ga-FAPI uptake on pulmonary arteries. This will be assessed using a visual scale and the Standardized uptake value (SUVmax).

    Measured: At baseline and at 24 weeks.

  2. Visual assessment of pulmonary artery [68Ga]Ga-FAPI uptake

    Change from baseline in regional lung perfusion as assessed by the Pulmonary vascular obstruction index (PVOI) (in %) on [68Ga]Ga-MAA lung perfusion PET/CT imaging at 24 weeks.

    Measured: At baseline and at 24 weeks.

  3. [68Ga] Ga-FAPI uptake on the right ventricule (RV) assessed by SUVmax at 24 weeks.

    Measured: At week 24

  4. RV ventricule dysfunction based on Tricuspid annular plane systolic excursion (TAPSE)<17mm at 24 weeks.

    Measured: At 24 weeks.

  5. Change from baseline in [68Ga] Ga-FAPI uptake on the RV as assessed by SUVmax at 24 weeks.

    Measured: At baseline and at 24 weeks.

  6. Mean pulmonary arterial pressure (mPAP) (in mmHg) at baseline.

    mPAP will be measured by right Heart catheterism (RHC).

    Measured: At baseline.

  7. Cardiac output (CO) (l/mn) at baseline.

    CO will be measured by RHC.

    Measured: At baseline.

  8. Right atrial pressure (RAP) (mmHg) at baseline.

    RAP will be measured by RHC.

    Measured: at baseline

  9. Right ventricular pressure (RVP) (mmHg) at baseline.

    CO will be measured by RHC.

    Measured: At baseline.

  10. Pulmonary vascular resistance (PVR) (Wood unit) at baseline.

    CO will be measured by RHC.

    Measured: At baseline.

  11. Mean pulmonary arterial pressure (mPAP) (mmHg) at 24 weeks.

    mPAP will be measured by right Heart catheterism (RHC).

    Measured: At 24 weeks.

  12. Cardiac output (CO) (l/mn) at 24 weeks.

    CO will be measured by RHC.

    Measured: At 24 weeks.

  13. Right atrial pressure (RAP) (mmHg) at 24 weeks.

    RAP will be measured by RHC.

    Measured: At 24 weeks.

  14. Right ventricular pressure (RVP) (mmHg) at 24 weeks.

    CO will be measured by RHC.

    Measured: at baseline

  15. 6 minutes walking test result (6MWT) (meters) at baseline.

    Measured: At baseline.

  16. Vascular remodeling on [68Ga]Ga-FAPI PET/CT is correlated with Nt-proBNP measure in PAH patients

    [68Ga] Ga-FAPI uptake on pulmonary arteries (SUVmax) will be correlated with Nt-proBNP measure in PAH patients

    Measured: at baseline

  17. 6 minutes walking test result (6MWT) (meters) at 24 weeks.

    Measured: At 24 weeks.

  18. NYHA functional class at baseline.

    The New York heart association (NYHA) scale will be used to classify the severity of the heart failure impact. Classes are defined as I, II, III, IV, with IV indicating severe limitations

    Measured: At baseline.

  19. NYHA functional class at 24 weeks.

    The New York heart association (NYHA) scale will be used to classify the severity of the heart failure impact extent of heart failure. Classes are defined as I, II, III, IV, with IV indicating severe limitations.

    Measured: At 24 weeks.

  20. N-terminal pro B natriuretic peptide (NT-pro-BNP) (pg/ml) at baseline

    biological mark indicating heart failure and impact on PH prognosis

    Measured: At baseline.

  21. N-terminal pro B natriuretic peptide (NT-pro-BNP) (pg/ml) at 24 weeks.

    biological mark indicating heart failure and impact on PH prognosis

    Measured: At 24 weeks.

  22. Quality of life (QOL) assessed by emPHasis-10 scale at baseline.

    The emPHasis-10 ranges from 0 to 50, with a higher score indicating a poorer health status and QOL.

    Measured: At baseline.

  23. QOL assessed by emPHasis-10 scale at 24 weeks.

    The emPHasis-10 ranges from 0 to 50, with a higher score indicating a poorer health status and QOL.

    Measured: At 24 weeks.

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted22 Jan 2026
  2. Study start15 Jul 2026 (estimated)
  3. Primary completion1 Jan 2028 (estimated)
  4. Study completion1 Jan 2028 (estimated)

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase 1/2
Primary purpose
Diagnosis
Allocation
Not applicable
Intervention model
Single group
Model description
This pilot study explores innovative imaging techniques, including \[⁶⁸Ga\]Ga-FAPI PET/CT and \[⁶⁸Ga\]Ga-MAA lung perfusion PET/CT , which have not yet been fully evaluated in patients with pulmonary arterial hypertension. Patients with an indication for sotatercept will be screened for eligibility according to predefined inclusion criteria. Eligible participants will be enrolled in the study. Each participant will undergo a comprehensive assessment including \[⁶⁸Ga\]Ga-FAPI PET/CT and \[⁶⁸Ga\]Ga-MAA PET/CT at baseline and at a follow-up visit 24 weeks later.
Masking
None (open label)
Enrolment
15 participants (estimated)
IDs, dates and publications
ClinicalTrials.gov ID
NCT07357974
Sponsor's protocol ID
29BRC24.0296
Acronym
SOFAPI
Status last verified
Jun 2026
First submitted
2 Dec 2025
Last updated
16 Jun 2026
Results posted
No
Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No

Questions about this trial

What is this clinical trial studying?

A Phase 1/2 study testing [68Ga]Ga-FAPI PET/CT and [68Ga]Ga-MAA PET/CT in people with Pulmonary Arterial Hypertension (PAH), run by University Hospital, Brest at 1 site in France.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 12 inclusion and 9 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: opening soon, as of the sponsor's last update on 16 Jun 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 1 site in France. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this combined phase mean?

Phase 1 studies test a treatment in a small group of people for the first time or in a new way, mainly to check safety and find the right dose.

Phase 2 studies give the treatment to a larger group to see whether it has the intended effect and to keep checking safety.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

This study is still under way. Results are not available in the source record yet.

How can a doctor refer a patient or contact the research team?

Contact Cécile Tromeur (+33230337602, Cecile.tromeur@chu-brest.fr), or a site near the patient. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Vascular remodeling as assessed by [68Ga] Ga-FAPI uptake of pulmonary arteries on PET/CT imaging. (time frame: at baseline). It is what the study was designed to measure, not a finding.

Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 16 Jun 2026.

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