Pulmonary HypertensionPhase 3ASSET-2NCT00313196
Efficacy and Safety of Bosentan in Sickle Cell Disease (SCD) Patients Diagnosed With Pulmonary Hypertension (PH)
A Phase 3 study testing bosentan in people with Pulmonary Hypertension, run by Actelion.
Trial summary
The study will assess the effect of bosentan on pulmonary vascular resistance and exercise capacity in Sickle Cell Disease (SCD) patients diagnosed with Pulmonary Hypertension. It consists of 3 phases: screening, treatment and follow-up. Read more about this study
- Who is it for?
- Ages 12 years and older
- Conditions the study is for
- Pulmonary Hypertension
- What is being tested?
- bosentan
- Type of treatment
- Pill or oral medicine
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 12 participants
- Where
- No sites listed yet
- Study dates
- Apr 2006to Aug 2007
- Phase
- Phase 3
- Are there results?
- None posted in the registry
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 12 years and older
- All sexes
- No healthy volunteers
- Child, Adult, Older adult
Who may be able to join
- Males or females > or = 12 years of age with a documented history of SCD
- Patients with symptomatic PH associated with shortness of breath
- Patients with tricuspid regurgitation jet (TRJ) velocity of > 2.9 m/sec based on echo/Doppler conducted within 6 months prior to randomization and not during SCD crisis
- Signed written informed consent is obtained from the patient or patient's parent/ legal representative prior to initiation of any study related procedure
- Patients with hemoglobin (Hb) SS or Hb S/β0 genotype and with Hb A < or = 10%
- Six-minute walk test (6MWT) distance > or = 150 m and < or = 450 m
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- Pulmonary hypertension confirmed by right heart catheterization (RHC) performed at the study site within 3 months of the randomization visit and defined as:
- Mean pulmonary arterial pressure (mPAP) > or - 25 mmHg
- Pulmonary capillary wedge pressure (PCWP) measured by right heart catheterization or left ventricular end diastolic pressure (LVEDP) measured by left heart catheterization, if PCWP measurement is not reliable. Two subsets of patients will be considered for this study:
- PCWP < or = 15 mm Hg, if PVR at rest < 160 dyn.sec/cm5
- PCWP of 16-25 mm Hg with any PVR value
- Women of childbearing potential must have a negative result on their serum pregnancy test and use reliable methods of contraception during study treatment and for 3 months after study treatment termination
Who cannot join
- Left ventricular ejection fraction < 40% (echo/Doppler)
- Systolic blood pressure (SBP) < 85 mmHg
- Uncontrolled hypertension with SBP > 160 mmHg and/or diastolic blood pressure > 100 mmHg
- Forced expiratory volume in 1 second divided by forced vital capacity (FEV1/FVC) < 0.5
- Total lung capacity (TLC) < 50% of normal predicted value
- Significant cardiac disease: ischemic, valvular, constrictive
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- Hemoglobin concentration < 6.0 g/dL at the time of randomization
- Acute liver disease
- cirrhosis or portal hypertension
- ALT > or = 2 times upper limit of normal (ULN) and/or albumin < 2.8 g/dL
- Acute or chronic impairment (other than dyspnea), limiting the ability to comply with study requirements (in particular with 6MWT), e.g., angina pectoris, intermittent claudication, symptomatic hip osteonecrosis
- Vaso-occlusive crisis (VOC) or acute chest syndrome (ACS) within 2 weeks of randomization or more than 12 VOC and/or ACS within the last 12 months
- Blood transfusion within 4 weeks prior to randomization
- Illness with a life expectancy shorter than 6 months
- HIV with opportunistic infection
- Psychotic, addictive or other disorder limiting the ability to provide informed consent or to comply with study requirements
- Pregnant or lactating women
- Recently started (< 8 weeks prior to randomization) or planned, exercise-based cardio-pulmonary rehabilitation program
- Bone marrow transplantation
- Treatment or planned treatment with another investigational drug within 3 months prior to randomization
- Treatment for pulmonary hypertension with an endothelin receptor antagonist, a phosphodiesterase-5 inhibitor, prostanoids (excluding acute administration during a catheterization procedure to test vascular reactivity) within 3 months prior to randomization or with L-arginine within 1 week prior to randomization
- Treatment with calcineurin-inhibitors (e.g., cyclosporine A and tacrolimus), sirolimus, fluconazole, amiodarone, miconazole and glibenclamide (glyburide) within 1 week prior to randomization
- Known hypersensitivity to bosentan or any of its excipients
About this study
Official title: Randomized, Placebo-controlled, Double-blind, Multicenter, Parallel Group Study to Assess the Efficacy, Safety and Tolerability of Bosentan in Patients With Symptomatic Pulmonary Hypertension Associated With Sickle Cell Disease
The study will assess the effect of bosentan on pulmonary vascular resistance and exercise capacity in Sickle Cell Disease (SCD) patients diagnosed with Pulmonary Hypertension. It consists of 3 phases: screening, treatment and follow-up. During the screening visit, the study doctor will decide if patients meet the study requirements. All potential patients will have a diagnosis of increased pulmonary artery pressures that is shown by right heart catheterization conducted shortly prior to start of study treatment. Patients will be asked to perform exercise capacity test (walking as far as possible for 6 minutes). Following the baseline visit the treatment phase consists of 4 additional clinic visits during which the good and bad effects of the drug are reviewed and exercise capacity test will be repeated. Patients will be treated for 16 weeks. Blood samples will be collected every month, or more often, if needed. At the end of the study some of the patients will be asked to repeat the right heart catheterization. All patients will repeat an exercise capacity test. After completion of the study, patients will have the option of enrolling in a long-term follow-up study where all patients will receive active drug. Patients electing not to participate in the extension study will be followed up for safety assessments for about 28 days after the end of the study treatment.
- Conditions
- Pulmonary Hypertension
- Being tested
- bosentan
- Keywords
- Pulmonary Hypertension, Sickle Cell Disease, Sickle cell anemia, bosentan, ASSET, ASSET-2
- Medical subject headings
- Hypertension, Pulmonary, Anemia, Sickle Cell
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
bosentanDrug
Oral Initial dose: 62.5 mg b.i.d. for 4 weeks for all patients, maintenance dose: 125 mg
| Study group | Role | What they receive |
|---|---|---|
| 1 | No intervention | Not described |
| 2 | Experimental | Not described Receives: Drug: bosentan |
What is being measured
The primary outcome is the main question the study is designed to answer.
Change from Baseline to End of Study in 6MWT distance. A mean difference from placebo of at least 35 m is considered clinically relevant.
Measured: 16 weeks
Secondary outcomes (1)
Time to clinical worsening from Baseline to End of Study.
Measured: 16 weeks
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted12 Apr 2006 (estimated)
- Study startApr 2006
- Primary completionAug 2007
- Study completionAug 2007
Why it stopped: Slow enrollment
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (1)Papers the sponsor has linked to this study.
- Other trials for Pulmonary HypertensionStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
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
- Masking
- Quadruple blind
- Who is masked
- Participant, Care provider, Investigator, Outcomes assessor
- Enrolment
- 12 participants (actual)
Sponsor and investigators
- Lead sponsor
- Actelion
- Sponsor type
- Industry (pharma, biotech, devices)
- Investigators
- Irina M Kline, MD, Study director, Actelion
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT00313196
- Sponsor's protocol ID
- AC-052-369
- Other IDs
- ASSET-2
- Acronym
- ASSET-2
- Status last verified
- Jan 2025
- First submitted
- 10 Apr 2006
- Last updated
- 4 Feb 2025
- Results posted
- No
Publications
Barst RJ, Mubarak KK, Machado RF, Ataga KI, Benza RL, Castro O, Naeije R, Sood N, Swerdlow PS, Hildesheim M, Gladwin MT; ASSET study group*. Exercise capacity and haemodynamics in patients with sickle cell disease with pulmonary hypertension treated with bosentan: results of the ASSET studies. Br J Haematol. 2010 May;149(3):426-35. doi: 10.1111/j.1365-2141.2010.08097.x. Epub 2010 Feb 17.
PubMed 20175775
Study at a glance
From the registry record, last updated by the sponsor on 4 Feb 2025. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Randomized, Placebo-controlled, Double-blind, Multicenter, Parallel Group Study to Assess the Efficacy, Safety and Tolerability of Bosentan in Patients With Symptomatic Pulmonary Hypertension Associated With Sickle Cell Disease
- ClinicalTrials.gov ID
- NCT00313196
- Acronym / sponsor ID
- ASSET-2 / AC-052-369
- Conditions
- Pulmonary Hypertension
- Keywords
- Pulmonary Hypertension, Sickle Cell Disease, Sickle cell anemia, bosentan, ASSET, ASSET-2
- Phase
- Phase 3
- Study type
- Interventional
- Recruitment status
- TerminatedReason stopped: Slow enrollment
- Enrolment
- 12 participants (actual)
- Lead sponsor
- ActelionIndustry (pharma, biotech, devices)
- Study start
- Apr 2006
- Primary completion
- Aug 2007 (actual)
- Study completion
- Aug 2007 (actual)
- First posted
- 12 Apr 2006 (estimated)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
The study will assess the effect of bosentan on pulmonary vascular resistance and exercise capacity in Sickle Cell Disease (SCD) patients diagnosed with Pulmonary Hypertension. It consists of 3 phases: screening, treatment and follow-up. During the screening visit, the study doctor will decide if patients meet the study requirements. All potential patients will have a diagnosis of increased pulmonary artery pressures that is shown by right heart catheterization conducted shortly prior to start of study treatment. Patients will be asked to perform exercise capacity test (walking as far as possible for 6 minutes). Following the baseline visit the treatment phase consists of 4 additional clinic visits during which the good and bad effects of the drug are reviewed and exercise capacity test will be repeated. Patients will be treated for 16 weeks. Blood samples will be collected every month, or more often, if needed. At the end of the study some of the patients will be asked to repeat the right heart catheterization. All patients will repeat an exercise capacity test. After completion of the study, patients will have the option of enrolling in a long-term follow-up study where all patients will receive active drug. Patients electing not to participate in the extension study will be followed up for safety assessments for about 28 days after the end of the study treatment.
Study design
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Quadruple blind (participant, care provider, investigator, outcomes assessor)
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| 1 | No intervention | – |
| 2 | Experimental | Drug: bosentan |
Who may qualify
- Ages
- 12 years and older
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Child, Adult, Older adult
Key inclusion criteria (12 listed)
- Males or females > or = 12 years of age with a documented history of SCD
- Patients with symptomatic PH associated with shortness of breath
- Patients with tricuspid regurgitation jet (TRJ) velocity of > 2.9 m/sec based on echo/Doppler conducted within 6 months prior to randomization and not during SCD crisis
- Signed written informed consent is obtained from the patient or patient's parent/ legal representative prior to initiation of any study related procedure
- Patients with hemoglobin (Hb) SS or Hb S/β0 genotype and with Hb A < or = 10%
Key exclusion criteria (23 listed)
- Left ventricular ejection fraction < 40% (echo/Doppler)
- Systolic blood pressure (SBP) < 85 mmHg
- Uncontrolled hypertension with SBP > 160 mmHg and/or diastolic blood pressure > 100 mmHg
- Forced expiratory volume in 1 second divided by forced vital capacity (FEV1/FVC) < 0.5
- Total lung capacity (TLC) < 50% of normal predicted value
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| bosentanOral Initial dose: 62.5 mg b.i.d. for 4 weeks for all patients, maintenance dose: 125 mg | Drug | 2 |
Primary outcome
Change from Baseline to End of Study in 6MWT distance. A mean difference from placebo of at least 35 m is considered clinically relevant.
Time frame: 16 weeks
1 secondary outcome
Time to clinical worsening from Baseline to End of Study.
Time frame: 16 weeks
Results and safety
The study was stopped early (reason given: Slow enrollment). Results are not available in the source record.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 4 Feb 2025.
- Derived from this study: PubMed 20175775Barst RJ, Mubarak KK, Machado RF, Ataga KI, Benza RL, Castro O, Naeije R, Sood N, Swerdlow PS, Hildesheim M, Gladwin MT; ASSET study group*. Exercise capacity and haemodynamics in patients with sickle cell disease with pulmonary hypertension treated with bosentan: results of the ASSET studies. Br J Haematol. 2010 May;149(3):426-35. doi: 10.1111/j.1365-2141.2010.08097.x. Epub 2010 Feb 17.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Irina M Kline, MD study director
Actelion
Questions about this trial
What is this clinical trial studying?
A Phase 3 study testing bosentan in people with Pulmonary Hypertension, run by Actelion.
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 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: stopped early, as of the sponsor's last update on 4 Feb 2025. Status can change between updates, so confirm with the study contact before making plans.
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?
The study was stopped early (reason given: Slow enrollment). Results are not available in the source record.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Change from Baseline to End of Study in 6MWT distance. A mean difference from placebo of at least 35 m is considered clinically relevant. (time frame: 16 weeks). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT00313196, which also lists 1 linked publication.
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 4 Feb 2025.