Aneurysmal Subarachnoid HemorrhagePhase 3REACTNCT03585270
Clinical Research Study With Clazosentan to Evaluate Its Effects on Preventing Complications Due to the Narrowing of the Blood Vessels (Vasospasm) in the Brain, Caused by Bleeding Onto the Surface of the Brain
A Phase 3 study testing Clazosentan in people with Aneurysmal Subarachnoid Hemorrhage, run by Idorsia Pharmaceuticals Ltd. at 80 sites in 15 countries.
Trial summary
This study will evaluate if clazosentan (on top of normal routine medical care) can reduce the risk of developing complications related to cerebral vasospasm and permanent brain damage as compared to normal routine medical care alone. Read more about this study
- Who is it for?
- Ages 18 to 70 years
- Conditions the study is for
- Aneurysmal Subarachnoid Hemorrhage
- What is being tested?
- Clazosentan
- Type of treatment
- Injection or infusion
- Could I receive a placebo?
- Yes, some participants may receive a placebo
- How many people
- 409 participants
- Where
- 80 sitesin 15 countries
- Study dates
- 3 Feb 2019to 18 Nov 2022
- Phase
- Phase 3
- Are there results?
- Yes, posted in the registrySummary in the doctors' view
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 to 70 years
- All sexes
- No healthy volunteers
- Adult, Older adult
Who may be able to join
- Written informed consent to participate in the study must be obtained from the subject or proxy/legal representative at any time from hospital admission to prior to initiation of any study-mandated procedure,
- Males and females aged 18 to 70 years (inclusive, at hospital admission),
- Participants with a ruptured saccular aneurysm, angiographically confirmed by DSA or CTA, which has been successfully secured within 72 hours of rupture, by surgical clipping or endovascular coiling,
- WFNS (World Federation of Neurosurgical Societies) grades 1-4 (based on Glasgow Coma Scale [GCS]) assessed after recovery from the aneurysm-securing procedure and after external ventricular drainage for hydrocephalus, if required.
- Participants must meet the criteria for the high-risk prevention group: Subjects with a "thick and diffuse clot" (thick and diffuse is defined as a thick confluent clot, more than 4 mm in thickness, involving 3 or more basal cisterns) on the hospital admission CT scan, absence of cerebral vasospasm at the time of randomization, and possibility to start study drug in the ICU (or equivalent environment where all protocol assessments can be performed and the Patient Management Guidelines followed), within 96 hours after the time of the aneurysm rupture.
- The recruitment into the early treatment group, i.e. participants without a thick and diffuse clot on the hospital admission CT scan who develop asymptomatic or minimally symptomatic moderate to severe angiographic vasospasm, within the 14-day period post-aneurysm rupture, and for whom it is possible to start study drug in the ICU (or equivalent environment where all protocol assessments can be performed and the Patient Management Guidelines followed), within 24 hours of this angiographic diagnosis, has been discontinued.
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- Presence of a cerebral CT scan performed at least 8 hours post aneurysm securing procedure and within 24 hours prior to randomization.
- Absence of a significant (e.g., symptomatic or large) new or worsened cerebral infarct or re-bleeding of the repaired aneurysm on the post-procedure CT scan.
- A woman of childbearing potential is eligible only if the pregnancy test performed during the screening period is negative. Agreement must be obtained to take the necessary precautions to avoid pregnancy from hospital discharge until 30 days post-study drug discontinuation. If breastfeeding, agreement must be obtained to refrain for the duration of the treatment with study drug and until 30 days post-study drug discontinuation.
- Males are eligible for study participation only if they agree to take the necessary precautions to avoid pregnancy in a female partner from hospital discharge until 30 days post-study drug discontinuation.
Who cannot join
- Aneurysmal subarachnoid hemorrhage (aSAH), aneurysm-securing procedure, vasospasm:
- Participants with SAH due to causes other than a saccular aneurysm (e.g., trauma or rupture of fusiform or mycotic aneurysms, SAH associated with arterio-venous malformation, vertebral dissections),
- Significant bleeding post aneurysm-securing procedure (e.g., due to intra-ventricular drain, intra-cerebral hemorrhage, epidural hematoma, vessel dissection or rupture, re-bleeding of the repaired aneurysm), based on investigator judgment,
- Intra-or peri-aneurysm securing procedure complication requiring non-routine medical or interventional treatment such as administration of an antithrombotic or anti-platelet agent (e.g., abciximab), which is not completely resolved prior to randomization,
- Intraventricular hemorrhage on the hospital admission CT scan, filling more than 50% of both lateral ventricles and with involvement of the 3rd and 4th ventricles.
- Intracerebral hemorrhage on the hospital admission CT scan, with an approximate volume of > 50 mL,
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- Presence of cerebral vasospasm at hospital admission (initial admission or transfer from another hospital) believed to be associated with a prior bleed (i.e., occurring before the bleed for which the subject is currently hospitalized). Vasospasm occurring during the aneurysm securing procedure is not an exclusion criterion,
- Neurological and functional status:
- Participants with a new major neurological deficit occurring post aneurysm-securing procedure which is attributable to the procedure and does not improve to pre-procedure status before randomization,
- Participants with a GCS score of ≤ 9 at the time of randomization and without intracranial pressure (ICP) monitoring,
- Modified Rankin Score of 3 or higher, prior to the aSAH (i.e., due to a chronic condition),
- Other clinical considerations:
- Participants with total bilirubin > 2 times the upper limit of normal, and/or a known diagnosis or clinical suspicion of liver cirrhosis or moderate to severe hepatic impairment,
- Hypotension (systolic blood pressure [SBP] ≤ 90 mmHg) at time of randomization that is refractory to treatment,
- Unresolved pulmonary edema or significant pneumonia still present at the time of randomization, or severe hypoxia at the time of randomization in intubated subjects, defined as PaO2/FiO2 ≤ 200,
- High sustained ICP (> 25 mmHg lasting > 20 minutes) at time of randomization, despite optimal treatment, in subjects with ICP monitoring,
- Severe cardiac failure requiring inotropic support at the time of random
Trial locations and contacts
80 sites in 15 countries.
80 sites in 15 countries
United States16 sites
University of Maryland Medical Systems - Neurosurgery
Baltimore, Maryland, 21201
Boston University School of Medicine / Boston University Medical Center
Boston, Massachusetts, 02118
Beth Israel Deaconess Medical Center Dept of Neurosurgery
Boston, Massachusetts, 02215
University of Illinois - Department of Neurosurgery
Chicago, Illinois, 60612
University Hospitals Case Medical Center - Department of Neurosurgery
Cleveland, Ohio, 44106
The Ohio State University - Wexner Medical Center
Columbus, Ohio, 43210
Penn State Milton S Hershey Medical Center, Neurosurgery
Hershey, Pennsylvania, 17033
Mayo clinic, Dept of Neurosurgery
Jacksonville, Florida, 32224
Northwell Health, Department of Neurosurgery
Manhasset, New York, 11030
Vanderbilt University Medical Center - Department of Neurosurgery
Nashville, Tennessee, 37232
Mt Sinai Hospital
New York, New York, 10029
Columbia University Medical Center Dept. of Neurology - Neurological Intensive Care Unit
New York, New York, 10032
Oklahoma University Health Sciences Center - Department of Neurology
Oklahoma City, Oklahoma, 73104
Oregon Health and Science University
Portland, Oregon, 97239
Virginia Commonwealth University, Department of Neurosurgery
Richmond, Virginia, 23298
Stanford Hospital & Clinics - Stanford School of Medicine Dept. of Neurosurgery
Stanford, California, 94305
Germany13 sites
Klinik für Diagnostische Radiologie und Neuroradiologie, Augsburg
Augsburg, 86156
Charite Universitätsmedizin Berlin - Klinik und Poliklinik für Neurochirurgie
Berlin, 10117
Heinrich-Heine Universität Düsseldorf -Klinik für Neurochirugie
Düsseldorf, 40225
University of Erlangen-Nürnberg, Dpt. of Neurosurgery
Erlangen, 91054
University Hospital of Essen, Department of Neurosurgery
Essen, 45147
Universitätsklinik Frankfurt, Klinik und Poliklinik für Neurochirurgie, Dept of neurosurgery
Frankfurt, 60528
Bezirkskrankenhaus Günzburg - Klinik für Neurochirugie
Günzburg, 89132
Asklepios Klinik St. Georg - Neurochirugie
Hamburg, 20099
University Hospital of Hamburg-Eppendorf, Dpt. of Neurosurgery
Hamburg, 20246
Neurochirurgische Universitätklinik des Heidelberg, Dept of Neurosurgery
Heidelberg, 69120
Universitätsklinikum Schleswig Hollstein Lübeck (UKSH) Klinik für Neurochirugie
Lübeck, 23538
University Regensburg, Dpt. of Neurosurgery
Regensburg, 93053
Universitätsklinikum Rostock, Abteilung für Neurochirurgie
Rostock, 18057
Spain8 sites
Hospital Universitario Germans Trias i Pujol - Neurology Department
Badalona, 08916
Hospital Vall d'Hebron Departamento Neuroradiología
Barcelona, 08035
Hospital Clinic Barcelona
Barcelona, 08036
Hospital Universitari de Bellvitge
L'Hospitalet de Llobregat, 08907
University Hospital of Gran Canaria Dr. Negrin
Las Palmas de Gran Canaria, 35010
Hospital Universitario 12 de Octubre, Departamento Neurosurgery Division Neuroradiology
Madrid, 28041
Hospital Universitari son Espases
Palma de Mallorca, 07014
Corporació Sanitària Parc Taulí, Hospital Parc Taulí
Sabadell, 08208
France7 sites
Hôpital neurologique Pierre Wertheimer Service de Reanimation
Bron, 69006
Hôpital Gabriel Montpied, ICU DEPT, Neuro reanimation departement
Clermont-Ferrand, 63003
Hôpital de la Timone 2, Intensive Care Unit SAR 1
Marseille, 13385
Hôpital Nord Laennec - CHU de Nantes
Nantes, 44093
Hospital Lariboisiere Paris
Paris, 75010
Hôpital Pitié-Salpêtrière, Service de neuroréanimation chirurgicale Babinski
Paris, 75013
Univ Hosp Toulouse, University Hospital Purpan Pierre Paul Riquet Hospital
Toulouse, 31059
Czechia5 sites
Fakultní nemocnice Brno Neurochirurgická klinika
Brno, 625 00
Fakultní nemocnice Ostrava Neurochirurgická klinika
Ostrava-Poruba, 708 52
University Hospital in Pilsen, Department of Neurosurgery
Pilsen, 304 60
Ústřední vojenská nemocnice Praha Neurochirurgická klinika
Prague, 169 02
Masarykova nemocnice v Ústí nad Labem Neurochirurgie
Ústí nad Labem, 401 13
Belgium4 sites
Hospital Erasme, Service de Soins Intensifs
Brussels, 1070
Hospital - Cliniques Universitaires Saint-Luc, Service de Neurochirurgie
Brussels, 1200
Neurology Department, University Hospital
Ghent, 9000
University Hospital Sart Tilman Liege
Liège, 4000
Canada4 sites
University of Alberta Hospital Department of Neurological Surgery
Edmonton, Alberta, T6G 2B7
Halifax Infirmary, Nova Scotia Health Authority
Halifax, Nova Scotia, B3H 3A7
Royal University Hospital Department of Neurology
Saskatoon, Saskatchewan, S7N 0W8
Winnipeg Regional Health Authority Health Sciences Centre
Winnipeg, Manitoba, R3A 1R9
Finland4 sites
Helsingin yliopistollinen keskussairaala Neurokirurgian klinikka
Helsinki, 00260
Kuopio University Hospital
Kuopio, 70210
Tampereen yliopistollinen sairaala Neurokirurgian klinika
Tampere, 33520
Turku University Hospital Neurosurgery, T-hospital
Turku, 20520
Israel4 sites
Rambam Healthcare Campus, Neurology Department
Haifa, 3109601
Hadassah Medical Center
Jerusalem, 9112001
Beilinson Hospital, Rabin Medical Center, Department of Neurosurgery
Petah Tikva, 4941492
The Chaim Sheba Medical Centre - Neurosurgery
Ramat Gan, 5265601
Italy4 sites
ASST Monza, Hospital San Gerardo, TERAPIA INTENSIVA Neurochirurgica
Monza, 20900
Azienda Ospedaliera Padova-Università degli Studi di Padova - Istituto di Anestesia e Rianimazione
Padova, 35128
Azienda Ospedaliero Universitaria di Parma, struttura complessa Neurochirurgia
Parma, 43126
Fondazione Policlinico Universitario Agostino Gemelli Università Cattolica del Sacro Cuore, UOS Terapia Intensiva Neurochirurgic
Rome, 00168
Poland3 sites
Uniwersytecki Szpital Kliniczny nr 1 im. Norberta Barlickiego
Lodz, 90-153
Oddział Neurochirurgii i Neurotraumatologii z Pododdziałem Leczenia Chorób Naczyniowych Centralnego Układu Nerwowego
Poznan, 60-355
Katedra i Klinika Neurochirurgii Samodzielny Publiczny Centralny Szpital Kliniczny w Warszawie
Warsaw, 02-097
Sweden3 sites
Sahlgrenska Universitetssjukhuset, Verksamheten för neurokirurgi, Neurosjukvården
Gothenburg, 41345
Linköping Universitetssjukhuset, Neurokirurgiska kliniken
Linköping, 58185
Lunds Universitetssjukhus, Neurokirurgiska avd. NIVA
Lund, 22185
Austria2 sites
Medizinische Universität Innsbruck; Universitätsklinik für Neurologie und Psychiatrie
Innsbruck, 6020
Kepler Universitätsklinikum, Universitätsklinik für Neurochirurgie
Linz, A-4020
Hungary2 sites
Debreceni Egyetem, Idegsebészet
Debrecen, 4032
Pécsi Tudományegyetem Klinikai Központ, Idegsebészeti Klinika
Pécs, 7623
Denmark1 site
Odense Universitets Hospital Neurokirurgisk afdelning
Odense, 5000
About this study
Official title: A Prospective, Multi-center, Double-blind, Randomized, Placebo-controlled, Parallel-group, Phase 3 Study to Assess the Efficacy and Safety of Clazosentan in Preventing Clinical Deterioration Due to Delayed Cerebral Ischemia (DCI), in Adult Subjects With Aneurysmal Subarachnoid Hemorrhage (aSAH)
This study will evaluate if clazosentan (on top of normal routine medical care) can reduce the risk of developing complications related to cerebral vasospasm and permanent brain damage as compared to normal routine medical care alone.
Read the detailed description
When a blood vessel just outside the brain bursts and causes bleeding onto its surface, the space surrounding the brain (the subarachnoid space) fills with blood. This condition is called subarachnoid hemorrhage. The bleeding due to the rupture of a pouch-like structure or a bulge (called an aneurysm) that formed on one of the blood vessels is condition called aneurysmal subarachnoid hemorrhage (aSAH).
In this study, clazosentan is being tested against normal routine medical care to determine if clazosentan can reduce the risk of developing complications related to vasospasm and permanent brain damage.
Participation will last for approximately 6 months from the episode of bleeding. For subjects randomized in the high-risk prevention group, treatment will start within 96 hours following the time of the aneurysm rupture, and be administered where possible, for 14 days. For subjects randomized in the early treatment group, treatment must begin within 24 hours of the time of the angiogram documenting the cerebral vasospasm necessary for entry into the study. Treatment will be administered for a minimum of 6 days and a maximum of 14 days. Recruitment in the early treatment group has been discontinued.
The end-of-study will be conducted as a telephone interview 6 months after the episode of bleeding.
- Conditions
- Aneurysmal Subarachnoid Hemorrhage
- Being tested
- Clazosentan, Placebo
- Medical subject headings
- Subarachnoid Hemorrhage
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
ClazosentanDrug
Also called ACT-108475
Clazosentan will be administered as a continuous intravenous infusion at the dose of 15 mg/hour for up to 14 days.
PlaceboDrug
Placebo will be administered at the same infusion rate as clazosentan for up to 14 days.
| Study group | Role | What they receive |
|---|---|---|
| Clazosentan | Experimental | Participants will receive clazosentan for up to 14 days, followed by a safety follow-up period of 24 hours, and an extended follow-up period to the end-of-study visit at Week 24 post aneurysmal subarachnoid hemorrhage (aSAH). Receives: Drug: Clazosentan |
| Placebo | Placebo comparator | Participants will receive clazosentan matching-placebo for up to 14 days, followed by a safety follow-up period of 24 hours, and an extended follow-up period to the end-of-study visit at Week 24 post aneurysmal subarachnoid hemorrhage (aSAH). Receives: Drug: Placebo |
What is being measured
The primary outcome is the main question the study is designed to answer.
Occurrence of Clinical Deterioration Due to Delayed Cerebral Ischemia (DCI) From Study Drug Initiation up to 14 Days Post-study Drug Initiation
Clinical deterioration due to delayed cerebral ischemia is defined as a worsening of at least 2 points compared to the reference score, on the modified Glasgow Coma Scale or the abbreviated National Institutes of Health Stroke Scale (aNIHSS), lasting for at least 2 hours, which cannot be entirely attributed to causes other than cerebral vasospasm. It is centrally adjudicated by the Clinical Event Committee (CEC) based on a written charter and review of clinical data, case narratives, angiograms and Computed Tomography scans.
Measured: Up to 14 days post-study drug initiation
Secondary outcomes (3)
Occurrence of Clinically Relevant Cerebral Infarction at Day 16 Post-study Drug Initiation
A clinical relevant cerebral infarction was defined as: all-cause cerebral infraction greater than or equal to 5 cm^3 or cerebral infarction less than 5 cm^3 in participants with clinical deterioration due to delayed cerebral ischemia.
Cerebral infarction refers to new or worsened infarcts and was determined by a central radiology review comparing the total volume of infarcts on the computed tomography (CT) scan performed 16 days after study drug initiation with the total volume on the CT scan performed just prior to randomization.
Measured: At Day 16 post study drug initiation
Long-term Clinical Outcome Assessed by the Modified Rankin Scale (mRS) at Week 12 Post-aneurysmal Subarachnoid Hemorrhage (aSAH)
The modified Rankin Scale (mRS) was used to measure the degree of disability in participants who had a ruptured saccular aneurysm and were at a high risk of developing a delayed cerebral infarction (DCI). The mRS is scored by the physician. The mRS scores ranged from 0 (no symptoms) to 6 (dead). The mRS score was dichotomized into poor outcome (score greater and equal to 3) and good outcome (score less than 3).
Measured: At Week 12 post-aneurysmal subarachnoid hemorrhage (aSAH)
Long-term Clinical Outcome Assessed by the Glasgow Outcome Scale Extended (GOSE) at Week 12 Post-aSAH
The Glasgow Outcome Scale - Extended (GOSE) is a scale scored by the physician. The GOSE scores range from 1 (dead) to 8 (upper good recovery).
The long-term clinical outcome assessed by the GOSE was dichotomized into poor outcome (score ≤ 4) and good outcome (score > 4)
Measured: At Week 12 post-aneurysmal subarachnoid hemorrhage (aSAH)
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted12 Jul 2018
- Study start3 Feb 2019
- Primary completion13 Jun 2022
- Study completion18 Nov 2022
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Posted resultsParticipant flow, outcome measures and adverse events reported by the sponsor.
- Publications (2)Papers the sponsor has linked to this study.
- Other trials for Aneurysmal Subarachnoid HemorrhageStudies 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
- Prevention
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Quadruple blind
- Who is masked
- Participant, Care provider, Investigator, Outcomes assessor
- Enrolment
- 409 participants (actual)
Sponsor and investigators
- Lead sponsor
- Idorsia Pharmaceuticals Ltd.
- Sponsor type
- Industry (pharma, biotech, devices)
- Responsible party
- Sponsor
- Investigators
- Clinical Trials, Study director, Idorsia Pharmaceuticals Ltd.
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT03585270
- Sponsor's protocol ID
- ID-054-304
- Other IDs
- 2018-000241-39, 2018
- Acronym
- REACT
- Status last verified
- Dec 2023
- First submitted
- 29 Jun 2018
- Last updated
- 10 Jan 2024
- Results posted
- Yes, on ClinicalTrials.gov
- Data monitoring committee
- Yes
- FDA-regulated drug
- Yes
- FDA-regulated device
- No
- Individual data sharing
- No
Publications
Mayer SA, Bruder N, Citerio G, Defreyne L, Dubois C, Gupta R, Higashida R, Marr A, Nguyen TN, Roux S, Smrcka M, Torne RT, Aldrich EF; on behalf of the REACT investigators. REACT: a randomized trial to assess the efficacy and safety of clazosentan for preventing clinical deterioration due to delayed cerebral ischemia after aneurysmal subarachnoid hemorrhage. J Neurosurg. 2024 Aug 9;142(1):98-109. doi: 10.3171/2024.4.JNS232191. Print 2025 Jan 1.
PubMed 39126720Bruder N, Higashida R, Santin-Janin H, Dubois C, Aldrich EF, Marr A, Roux S, Mayer SA. The REACT study: design of a randomized phase 3 trial to assess the efficacy and safety of clazosentan for preventing deterioration due to delayed cerebral ischemia after aneurysmal subarachnoid hemorrhage. BMC Neurol. 2022 Dec 20;22(1):492. doi: 10.1186/s12883-022-03002-8.
PubMed 36539711
Study at a glance
From the registry record, last updated by the sponsor on 10 Jan 2024. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- A Prospective, Multi-center, Double-blind, Randomized, Placebo-controlled, Parallel-group, Phase 3 Study to Assess the Efficacy and Safety of Clazosentan in Preventing Clinical Deterioration Due to Delayed Cerebral Ischemia (DCI), in Adult Subjects With Aneurysmal Subarachnoid Hemorrhage (aSAH)
- ClinicalTrials.gov ID
- NCT03585270
- Acronym / sponsor ID
- REACT / ID-054-304
- Conditions
- Aneurysmal Subarachnoid Hemorrhage
- Phase
- Phase 3
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 409 participants (actual)
- Lead sponsor
- Idorsia Pharmaceuticals Ltd.Industry (pharma, biotech, devices)
- Study start
- 3 Feb 2019 (actual)
- Primary completion
- 13 Jun 2022 (actual)
- Study completion
- 18 Nov 2022 (actual)
- First posted
- 12 Jul 2018 (actual)
- Results
- Posted 10 Jan 2024
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
This study will evaluate if clazosentan (on top of normal routine medical care) can reduce the risk of developing complications related to cerebral vasospasm and permanent brain damage as compared to normal routine medical care alone.
Detailed description
When a blood vessel just outside the brain bursts and causes bleeding onto its surface, the space surrounding the brain (the subarachnoid space) fills with blood. This condition is called subarachnoid hemorrhage. The bleeding due to the rupture of a pouch-like structure or a bulge (called an aneurysm) that formed on one of the blood vessels is condition called aneurysmal subarachnoid hemorrhage (aSAH).
In this study, clazosentan is being tested against normal routine medical care to determine if clazosentan can reduce the risk of developing complications related to vasospasm and permanent brain damage.
Participation will last for approximately 6 months from the episode of bleeding. For subjects randomized in the high-risk prevention group, treatment will start within 96 hours following the time of the aneurysm rupture, and be administered where possible, for 14 days. For subjects randomized in the early treatment group, treatment must begin within 24 hours of the time of the angiogram documenting the cerebral vasospasm necessary for entry into the study. Treatment will be administered for a minimum of 6 days and a maximum of 14 days. Recruitment in the early treatment group has been discontinued.
The end-of-study will be conducted as a telephone interview 6 months after the episode of bleeding.
Study design
- Primary purpose
- Prevention
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Quadruple blind (participant, care provider, investigator, outcomes assessor)
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| Clazosentan | Experimental | Drug: ClazosentanParticipants will receive clazosentan for up to 14 days, followed by a safety follow-up period of 24 hours, and an extended follow-up period to the end-of-study visit at Week 24 post aneurysmal subarachnoid hemorrhage (aSAH). |
| Placebo | Placebo comparator | Drug: PlaceboParticipants will receive clazosentan matching-placebo for up to 14 days, followed by a safety follow-up period of 24 hours, and an extended follow-up period to the end-of-study visit at Week 24 post aneurysmal subarachnoid hemorrhage (aSAH). |
Who may qualify
- Ages
- 18 to 70 years
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (10 listed)
- Written informed consent to participate in the study must be obtained from the subject or proxy/legal representative at any time from hospital admission to prior to initiation of any study-mandated procedure,
- Males and females aged 18 to 70 years (inclusive, at hospital admission),
- Participants with a ruptured saccular aneurysm, angiographically confirmed by DSA or CTA, which has been successfully secured within 72 hours of rupture, by surgical clipping or endovascular coiling,
- WFNS (World Federation of Neurosurgical Societies) grades 1-4 (based on Glasgow Coma Scale [GCS]) assessed after recovery from the aneurysm-securing procedure and after external ventricular drainage for hydrocephalus, if required.
- Participants must meet the criteria for the high-risk prevention group: Subjects with a "thick and diffuse clot" (thick and diffuse is defined as a thick confluent clot, more than 4 mm in thickness, involving 3 or more basal cisterns) on the hospital admission CT scan, absence of cerebral vasospasm at the time of randomization, and possibility to start study drug in the ICU (or equivalent environment where all protocol assessments can be performed and the Patient Management Guidelines followed), within 96 hours after the time of the aneurysm rupture.
Key exclusion criteria (17 listed)
- Aneurysmal subarachnoid hemorrhage (aSAH), aneurysm-securing procedure, vasospasm:
- Neurological and functional status:
- Other clinical considerations:
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 |
|---|---|---|
| ClazosentanAlso: ACT-108475Clazosentan will be administered as a continuous intravenous infusion at the dose of 15 mg/hour for up to 14 days. | Drug | Clazosentan |
| PlaceboPlacebo will be administered at the same infusion rate as clazosentan for up to 14 days. | Drug | Placebo |
Primary outcome
Occurrence of Clinical Deterioration Due to Delayed Cerebral Ischemia (DCI) From Study Drug Initiation up to 14 Days Post-study Drug Initiation
Time frame: Up to 14 days post-study drug initiation
Clinical deterioration due to delayed cerebral ischemia is defined as a worsening of at least 2 points compared to the reference score, on the modified Glasgow Coma Scale or the abbreviated National Institutes of Health Stroke Scale (aNIHSS), lasting for at least 2 hours, which cannot be entirely attributed to causes other than cerebral vasospasm. It is centrally adjudicated by the Clinical Event Committee (CEC) based on a written charter and review of clinical data, case narratives, angiograms and Computed Tomography scans.
3 secondary outcomes
Occurrence of Clinically Relevant Cerebral Infarction at Day 16 Post-study Drug Initiation
Time frame: At Day 16 post study drug initiation
Long-term Clinical Outcome Assessed by the Modified Rankin Scale (mRS) at Week 12 Post-aneurysmal Subarachnoid Hemorrhage (aSAH)
Time frame: At Week 12 post-aneurysmal subarachnoid hemorrhage (aSAH)
Long-term Clinical Outcome Assessed by the Glasgow Outcome Scale Extended (GOSE) at Week 12 Post-aSAH
Time frame: At Week 12 post-aneurysmal subarachnoid hemorrhage (aSAH)
Results and safety
Loading the posted results from ClinicalTrials.gov…
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 10 Jan 2024.
- Posted resultsParticipant flow, baseline, all outcome measures and adverse events.
- Derived from this study: PubMed 39126720Mayer SA, Bruder N, Citerio G, Defreyne L, Dubois C, Gupta R, Higashida R, Marr A, Nguyen TN, Roux S, Smrcka M, Torne RT, Aldrich EF; on behalf of the REACT investigators. REACT: a randomized trial to assess the efficacy and safety of clazosentan for preventing clinical deterioration due to delayed cerebral ischemia after aneurysmal subarachnoid hemorrhage. J Neurosurg. 2024 Aug 9;142(1):98-109. doi: 10.3171/2024.4.JNS232191. Print 2025 Jan 1.
- Derived from this study: PubMed 36539711Bruder N, Higashida R, Santin-Janin H, Dubois C, Aldrich EF, Marr A, Roux S, Mayer SA. The REACT study: design of a randomized phase 3 trial to assess the efficacy and safety of clazosentan for preventing deterioration due to delayed cerebral ischemia after aneurysmal subarachnoid hemorrhage. BMC Neurol. 2022 Dec 20;22(1):492. doi: 10.1186/s12883-022-03002-8.
- Individual participant dataSharing planned: No
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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.
Clinical Trials study director
Idorsia Pharmaceuticals Ltd.
80 sites in 15 countries: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A Phase 3 study testing Clazosentan in people with Aneurysmal Subarachnoid Hemorrhage, run by Idorsia Pharmaceuticals Ltd. at 80 sites in 15 countries.
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 17 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: finished, as of the sponsor's last update on 10 Jan 2024. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 80 sites in United States, Germany, Spain, France, Czechia and 10 more countries. 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. Some participants in this study may receive a placebo. 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?
Yes. Results are posted in the registry (first posted 10 Jan 2024). A summary is in the For doctors view, and the full results are on ClinicalTrials.gov.
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?
Occurrence of Clinical Deterioration Due to Delayed Cerebral Ischemia (DCI) From Study Drug Initiation up to 14 Days Post-study Drug Initiation (time frame: Up to 14 days post-study drug initiation). 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 NCT03585270, which also lists 2 linked publications.
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 10 Jan 2024.