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CTEPHPhase 3DIRECTIONNCT07644377

Discontinuation Versus Continuation of Riociguat Monotherapy in Chronic Thromboembolic Pulmonary Hypertension Successfully Treated With Balloon Pulmonary Angioplasty

A Phase 3 study testing Discontinuation of riociguat in people with CTEPH, run by Assistance Publique - Hôpitaux de Paris at 22 sites 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
Search all trials

Trial summary

Chronic thromboembolic pulmonary hypertension (CTEPH) is a rare but severe complication of acute pulmonary embolism, characterized by persistent obstruction of the pulmonary arteries by organized thrombi and secondary microvasculopathy. Read more about this study

Who is it for?
Ages 18 years and older
Conditions the study is for
CTEPH
What is being tested?
Discontinuation of riociguat
Could I receive a placebo?
No, everyone receives an active treatment
How many people
150 participants
Where
22 sitesFrance
Study dates
1 Nov 2026to 31 Jan 2031
Phase
Phase 3
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

  • 1. Signed informed consent and willingness to accept either discontinuation or continuation of riociguat monotherapy
  • 2. Age ≥18 years
  • 3. Diagnosis of inoperable CTEPH or persistent PH after PEA, with achievement of therapeutic goals following BPA, defined as:
  • WHO FC I or II
  • Pulmonary vascular resistance (PVR) < 3 Wood units
  • Mean pulmonary artery pressure (mPAP) < 30 mmHg
Show all 10Show fewer
  • 4. Treatment with riociguat monotherapy for ≥6 months, with stable dose for ≥3 months prior to enrollment
  • 5. Last BPA session performed ≥6 months prior to enrollment
  • 6. 6-minute walk distance (6MWD) ≥ 150 meters
  • 7. For women of childbearing potential: highly effective contraception

Who cannot join

  • 1. Background treatment with any PH-targeted therapy other than riociguat, (e.g., any endothelin receptor antagonist (ERA), phosphodiesterase-5 inhibitor (PDE-5i), parenteral prostanoids, prostacyclin receptor agonist)
  • 2. Post-capillary pulmonary hypertension, defined as pulmonary artery wedge pressure (PAWP) > 15 mmHg
  • 3. Significant obstructive or restrictive lung disease, defined as:
  • FEV₁ < 60% predicted, with FEV₁/FVC < 65%
  • and/or total lung capacity (TLC) < 60% predicted
  • or known significant chronic lung disease on imaging (e.g., interstitial lung disease, emphysema)
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  • 4. Severe hepatic impairment, defined as:
  • Child-Pugh class B or C
  • and/or liver aminotransferase levels > 3× upper limit of normal (ULN)
  • 5. Severe renal impairment (estimated creatinine clearance ≤ 30 mL/min/1.73 m²).
  • 6. Left heart failure with left ventricular ejection fraction (LVEF) < 40%
  • 7. Ongoing or planned treatment with organic nitrates.
  • 8. Concomitant treatment with strong cytochrome P450 3A4 (CYP3A4) inducers (e.g., rifabutin, rifampicin, carbamazepine, phenobarbital, phenytoin, St. John's wort)
  • 9. Concomitant treatment with strong multi pathway P-glycoprotein (P-gp)/ breast cancer resistance protein (BCRP) inhibitors (e.g., lopinavir/ritonavir).
  • 10. Treatment with a strong CYP3A4 inhibitor (e.g., ketoconazole, itraconazole, voriconazole, clarithromycin, telithromycin, nefazodone, ritonavir, and saquinavir) or a moderate dual CYP3A4/CYP2C9 inhibitor (e.g., fluconazole, amiodarone) or co-administration of a combination of moderate CYP3A4 and moderate CYP2C9 inhibitors.
  • 11. History of life-threatening hemoptysis (>100 mL within 24 hours) or prior bronchial artery embolization for hemoptysis
  • 12. Pregnancy, breastfeeding, or intention to become pregnant during the study period
  • 13. Severe comorbidities or underlying conditions with an anticipated life expectancy < 12 months, including active malignancy with localized or metastatic disease
  • 14. Lack of coverage by national health or social security systems
  • 15. Alcohol abuse, as determined by the investigator
  • 16. Any condition or factor likely to interfere with protocol compliance, in the opinion of the investigator
  • 17. Patient under guardianship or curatorship
  • 18. Participation in another interventional trial or being in the exclusion period following a previous research involving the human person

Trial locations and contacts

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

Mitja JEVNIKAR, MD contact

+33 145217876

mitja.jevnikar@aphp.fr

22 sites in 1 country

France22 sites
  • CHU Angers

    Angers, 49000

    Frédéric GAGNADOUX, PUPH, +33241353695, frgagnadoux@chu-angers.fr

  • Hôpital Haut Levêque

    Bordeaux, 33600

    François PICARD, PUPH, +33557656267, francois.picard@chubordeaux.fr

  • Hôpital de la Cavale blanche

    Brest, 29200

    Cécile TROMEUR, PUPH, +33230337602, cecile.tromeur@chu-brest.fr

  • CHU Caen

    Caen, 14034

    Emmanuel BERGOT, PUPH, +33331064677, bergot-e@chu-caen.fr

  • Hôpital Gabriel Montpied

    Clermont-Ferrand, 63000

    Romain TRESORIER, MD, +33473751412, rtresorier@chuclermontferrand.fr

  • CHU Dijon Bourgogne

    Dijon, 21000

    Nicolas FAVROLT, MD, +33380293772, Nicolas.favrolt@chu-dijon.fr

  • CHU Grenoble Alpes

    Grenoble, 38700

    Hélène BOUVAIST, MD, +33476768888, hbouvaist@chu-grenoble.fr

  • Hôpital Bicêtre

    Le Kremlin-Bicêtre, 94270

    Mitja JEVNIKAR, MD, +33 145217876, mitja.jevnikar@aphp.fr

  • Institut Cœur-Poumon

    Lille, 59037

    Nicolas LAMBLIN, PUPH, +33320445038, Nicolas.lamblin@chru-lille.fr

  • Hôpital de la Timone

    Marseille, 13005

    Sébastien RENARD, MD, +33491385978, sebastien.renard@ap-hm.fr

  • Hôpital Nord

    Marseille, 13915

    Martine REYNAUD GAUBERT, PUPH, +33491966145, martine.reynaud@ap-hm.fr

  • CHU Montpellier

    Montpellier, 34295

    Arnaud BOURDIN, PUPH, a-bourdin@chu-montpellier.fr

  • Hôpital Laënnec

    Nantes, 44800

    Delphine HOREAU LANGLARD, MD, +33240165229, delphine.horeaulanglard@chu-nantes.fr

  • Hôpital Européen Georges Pompidou

    Paris, 75015

    Olivier SANCHEZ, PUPH, +33 156093461, olivier.sanchez@aphp.fr

  • CHU Poitiers

    Poitiers, 86000

    Magali CROQUETTE, MD, +33549443570, magali.croquette@chu-poitiers.fr

  • Hôpital Pontchaillou

    Rennes, 35000

    Céline CHABANNE, MD, +33299282473, celine.chabanne@chu-rennes.fr

  • CHU Rouen

    Rouen, 76031

    Elise ARTAUD-MACARI, MD, +33232885992, Elise.artaud-macari@chu-rouen.fr

  • CHU Saint Etienne

    Saint-Etienne, 42270

    Laurent BERTOLETTI, PUPH, +33477127770, laurent.bertoletti@chu-st-etienne.fr

  • Nouvel Hôpital Civil

    Strasbourg, 67091

    Marianne RIOU, MD, +33369551145, marianne.riou@chru-strasbourg.fr

  • Hôpital Larrey

    Toulouse, 31059

    Elise NOEL SAVINA, MD, +33567771744, noel-savina.e@chu-toulouse.fr

  • Hôpital Bretonneau

    Tours, 37044

    Pascal MAGRO, PUPH, +33247478784, magro@med.univ-tours.fr

  • Hôpital Brabois

    Vandœuvre-lès-Nancy, 54500

    Ari CHAOUAT, PUPH, +33383154021, a.chaouat@chru-nancy.fr

Other trials in France

About this study

Chronic thromboembolic pulmonary hypertension (CTEPH) is a rare but severe complication of acute pulmonary embolism, characterized by persistent obstruction of the pulmonary arteries by organized thrombi and secondary microvasculopathy. International guidelines recommend a multimodal approach combining pulmonary endarterectomy (PEA), balloon pulmonary angioplasty (BPA), and medical treatment with riociguat, to address the full spectrum of CTEPH lesions. BPA and riociguat are recommended for symptomatic patients with inoperable CTEPH or persistent pulmonary hypertension after PEA. Riociguat is administered before BPA to reduce periprocedural complications by improving pulmonary hemodynamics. While this pre-BPA strategy is well established, post-BPA management is poorly studied, especially in patients achieving therapeutic goals, defined as WHO functional class I or II and near-normal resting pulmonary hemodynamics (70 to 80% of cases). In such cases, riociguat monotherapy is often continued long-term, despite its cost, burden, and potential side effects, which may negatively impact patients' quality of life. Retrospective single-center studies suggest that discontinuation of medical treatment does not lead to significant clinical deterioration. Therefore, we propose conducting a multicenter trial using a PROBE (prospective, randomized, open-label, blinded endpoint) design and a Bayesian approach to test if stopping riociguat monotherapy after successful BPA is associated with an acceptably low risk of clinical worsening over a follow-up period of at least one year compared to continuation. The trial will also assess the cost-effectiveness of riociguat discontinuation.

Conditions
CTEPH
Being tested
Discontinuation of riociguat
Keywords
riociguat discontinuation

What participants receive

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

  • Discontinuation of riociguatDrug

    Discontinuation of riociguat after randomization

Study groups in NCT07644377
Study groupRoleWhat they receive
Experimental groupExperimentalDiscontinuation of riociguat
Receives: Drug: Discontinuation of riociguat
Control groupNo interventionContinuation of riociguat

What is being measured

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

  1. To evaluate whether the discontinuation of riociguat monotherapy after successful BPA in CTEPH patients is associated with an acceptably low risk of clinical worsening compared to continuation

    Clinical worsening which is the composite of :

    • death due to any cause,
    • hospitalisation due to worsening including : a) documented right heart failure, b) need for lung transplantation, c) need for intraveinous diuretics/inotropic support or d) need for parental prostanoids
    • decline in 6 minutes walk distance by 15% from baseline, combined with WHO functional class III or IV

    Measured: At the longest follow-up, minimum 12 months

Secondary outcomes (12)
  1. To compare the effect of discontinuation versus continuation of riociguat monotherapy on 6-minute walk distance (6MWD)

    Change from baseline in 6-minute walk distance (6MWD)

    Measured: Month 3, 6, 12 and every 6 months with maximum of 48 months

  2. To compare the effect of discontinuation versus continuation of riociguat monotherapy on WHO functionnal class

    Change from baseline in WHO functionnal class

    Measured: Month 3, 6, 12 and every 6 months with maximum of 48 months

  3. To compare the effect of discontinuation versus continuation of riociguat monotherapy on WHO functionnal class

    Change from baseline in Borg dyspnea

    Measured: Month 3, 6, 12 and every 6 months with maximum of 48 months

  4. To compare the effect of discontinuation versus continuation of riociguat monotherapy on other clinical measures of pulmonary hypertension

    Change from baseline in N-terminal pro-brain natriuretic peptide (NT-proBNP) levels

    Measured: Month 3, 6, 12 and every 6 months with maximum of 48 months

  5. To compare the effect of discontinuation versus continuation of riociguat monotherapy on pulmonary vascular resistance (PVR)

    Change from baseline in Pulmonary vascular resistance (PVR)

    Measured: Month 12

  6. To compare the effect of discontinuation versus continuation of riociguat monotherapy on hemodynamic parameters :

    Change from baseline in Right atrial pressure

    Measured: Month 12

  7. To compare the effect of discontinuation versus continuation of riociguat monotherapy on hemodynamic parameters

    Change from baseline in Mean pulmonary arterial pressure (mPAP)

    Measured: Month 12

  8. To compare the effect of discontinuation versus continuation of riociguat monotherapy on hemodynamic parameters

    Change from baseline in Cardiac output

    Measured: Month 12

  9. To compare the effect of discontinuation versus continuation of riociguat monotherapy on quality of life

    Change from baseline in EQ-5D-5L questionnaire

    Measured: Month 3, 6, 12 and every 6 months with maximum of 48 months

  10. To compare the effect of discontinuation versus continuation of riociguat monotherapy on quality of life

    Change from baseline in EmPHasis-10 questionnaire (scale from 0 (best) to 5 (worst)

    Measured: Month 3, 6, 12 and every 6 months with maximum of 48 months

  11. To assess the health economic impact of riociguat discontinuation

    Incremental cost-effectiveness ratio (ICER), defined as the difference in in quality-adjusted life years (QALYS), for the strategy of riociguat monotherapy discontinuation from the perspective of the French public health system

    Measured: At the longest follow-up, minimum 12 months

  12. To assess treatment burden

    Change from baseline in Treatment burden questionnaire

    Measured: Month 12

Timeline

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

  1. First posted12 Jun 2026
  2. Study start1 Nov 2026 (estimated)
  3. Primary completion31 Jan 2031 (estimated)
  4. Study completion31 Jan 2031 (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 3
Primary purpose
Treatment
Allocation
Randomised
Intervention model
Parallel groups
Model description
This is a multicenter trial using a PROBE design conducted in patients with inoperable CTEPH or persistent PH after PEA, who have been receiving riociguat monotherapy for ≥6 months and have achieved therapeutic goals following BPA. Eligible patients will be randomly assigned in a 1:1 ratio to two treatment groups: * Experimental group: discontinuation of riociguat * Control group: continuation of riociguat Regular hospital visits will be conducted at months 3, 6, and 12, including WHO FC assessment, clinical examination, 6MWD, routine blood tests (including NT-proBNP), and quality of life assessment (EmPHasis-10 and EQ-5D-5L). At month 12, an RHC will be also performed to assess hemodynamic parameters. Thereafter, patients will be evaluated every 6 months until the last enrolled patient has completed the minimum 12-month follow-up. Adjudication of all clinical worsening events will be performed by an independent Clinical Event Committee (CEC)
Masking
None (open label)
Enrolment
150 participants (estimated)
IDs, dates and publications
ClinicalTrials.gov ID
NCT07644377
Sponsor's protocol ID
APHP251608
Other IDs
2026-525351-81-00
Acronym
DIRECTION
Status last verified
Sep 2026
First submitted
1 Jun 2026
Last updated
14 Sep 2026
Results posted
No
Data monitoring committee
Yes
FDA-regulated drug
No
FDA-regulated device
No

Questions about this trial

What is this clinical trial studying?

A Phase 3 study testing Discontinuation of riociguat in people with CTEPH, run by Assistance Publique - Hôpitaux de Paris at 22 sites 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 10 inclusion and 23 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 14 Sep 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 22 sites 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 phase mean?

Phase 3 studies compare the treatment with the current standard treatment or a placebo in a large group, to confirm how well it works and watch for side effects.

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 Mitja JEVNIKAR, MD (+33 145217876, mitja.jevnikar@aphp.fr), or a site near the patient. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

To evaluate whether the discontinuation of riociguat monotherapy after successful BPA in CTEPH patients is associated with an acceptably low risk of clinical worsening compared to continuation (time frame: At the longest follow-up, minimum 12 months). 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 14 Sep 2026.

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