New hope for rare bleeding disorder: emicizumab trial launches
NCT ID NCT05345197
First seen Jun 27, 2026 · Last updated Jun 27, 2026
Summary
This phase 2 trial tests the drug emicizumab (Hemlibra) as a regular injection to prevent bleeding in 51 adults with acquired hemophilia A, a rare condition where the immune system attacks clotting factors. Participants receive two loading doses then weekly shots, along with standard immune-suppressing therapy. The main goal is to see how many serious bleeds occur over 12 weeks.
What this could mean
Our plain-language read of the trial. This is informational only, not medical advice or a prediction.
- Active substance
- emicizumab (Hemlibra)
- What this could lead to
- If successful, this could provide a new way to prevent dangerous bleeding episodes in people with acquired hemophilia A, reducing the need for frequent hospital visits.
- What could go wrong
- This is a small, early-phase trial with no comparison group. Risks include blood clots or other side effects, and the treatment may not work for everyone.
This is an AI summary of the original study and may miss details. Read our disclaimer.
Study facts
What this study's own registry entry says, in plain language.
- Phase
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Phase 2
Tests whether the treatment actually works, and watches for side effects, in a larger group.
- Participants
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About 51 people
The number the study aims to enrol. It can still change while the study runs.
- Started
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Aug 2022
- Expected to finish
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Dec 2026
An estimate. End dates often move.
- Lead sponsor
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Other sponsor
The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.
Who can take part
This study's own entry requirements. Only the study team can say for certain whether you qualify.
- Ages
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18 years and older
- Sex
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Anyone
- Healthy volunteers
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Not accepted
This study is not open to healthy volunteers. The entry requirements below say who it is open to.
Show the full entry requirements Hide the full entry requirements
Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.
Inclusion Criteria: * Signed Informed Consent/Assent Form * Age ≥18 years at time of signing Informed Consent Form * Ability to comply with the study protocol, in the investigator's judgment * Diagnosis of AHA based on a reduced FVIII activity (\<50 %) and positive FVIII inhibitor (\>0.6 BU/ml) at screening (local laboratory) * Current bleeding due to AHA at the time of screening * Plan to be adherent to emicizumab prophylaxis during the study * For women of childbearing potential who meet the following criteria: * Refrain from heterosexual intercourse or use contraceptive methods that result in a failure rate of \<1% per year during the study period A woman with ≥ 12 continuous months of amenorrhea with no identified cause other than menopause and has not undergone surgical sterilization (removal of ovaries and/or uterus). use of combined oral or injected hormonal contraceptive, bilateral tubal ligation, male sterilization, hormone- releasing intrauterine devices, and copper intrauterine devices. Exclusion Criteria: * Congenital hemophilia A * Treatment with aPCC within the last 24 hours before first study treatment or planned treatment with aPCC during the course of the study * Known positive lupus anticoagulant at the time of screening * Severe uncontrolled infection at the time of screening * Signs of active disseminated intravascular coagulation at the time of screening - * Emicizumab ⎯ AHA Emi Version 1.0 20 * Current treatment for thromboembolic disease or signs of current thromboembolic disease at time of screening * Patients who are at high risk for TMA (e.g., have a previous medical or family history of TMA), in the investigator's judgment * Known severe congenital or acquired thrombophilia * Life expectancy \<3 months at the time of screening * Other conditions that substantially increase risk of bleeding or thrombosis by the discretion of the investigator * Contraindications according to the Investigator's Brochure of emicizumab * Current treatment with emicizumab at time of screening * History of clinically significant hypersensitivity associated with monoclonal antibody therapies or components of the emicizumab injection by the discretion of the investigator * Concurrent disease, treatment, or abnormality in clinical laboratory tests that could interfere with the conduct of the study, may pose additional risk, or would, in the opinion of the local investigator, preclude the patient's safe participation in and completion of the study * Addiction or other diseases that preclude the patient from appropriately assessing the nature and scope as well as possible consequences of the clinical study by the discretion of the investigator * Pregnant or breast-feeding women * Would refuse treatment with blood or blood products, if necessary. * Subject is in custody by order of an authority or a court of law * Treatment with any of the following: * An investigational drug to treat or reduce the risk of hemophilic bleeds within 5 half-lives of last drug administration before Study Day 1 * A non-hemophilia-related investigational drug within the last 30 days or 5 half-lives- before Study Day 1, whichever is longer * An investigational drug concurrently * History of clinically significant hypersensitivity associated with monoclonal antibody therapies or components of the emicizumab injection
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
Locations
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Bleeding and Clotting Disorders Institute
Peoria, Illinois, 61614, United States
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Emory University
Atlanta, Georgia, 30308, United States
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Georgetown University
Washington D.C., District of Columbia, 20007, United States
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Hemophilia Center of Western Pennsylvania
Pittsburgh, Pennsylvania, 15213, United States
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Indiana Hemophilia and Thrombosis Center, Inc.
Indianapolis, Indiana, 46260, United States
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Mayo Clinic
Rochester, Minnesota, 55905, United States
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Penn Blood Disorders Program, Hospital of the University of Pennsylvania
Philadelphia, Pennsylvania, 19104, United States
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Tulane University
New Orleans, Louisiana, 70112-2632, United States
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UCSD Hemophilia and Thrombosis Treatment Center
San Diego, California, 92121, United States
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UVA Comprehensive Cancer Center
Charlottesville, Virginia, 22908, United States
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University of North Carolina
Chapel Hill, North Carolina, 27514, United States
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University of Oklahoma Health Sciences Center
Oklahoma City, Oklahoma, 73104, United States
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University of Vermont Medical Center
Burlington, Vermont, 05401, United States
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Versiti Inc.
Milwaukee, Wisconsin, 53226, United States
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Washington Center for Bleeding Disorders
Seattle, Washington, 98101, United States
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Washington University
St Louis, Missouri, 63110, United States
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Other studies related to the condition(s) this trial covers.