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Hereditary AngioedemaPhase 1/2NCT05695248

A Study of Navenibart (STAR-0215) in Participants With Hereditary Angioedema

A Phase 1/2 study testing Navenibart in people with Hereditary Angioedema, run by Astria Therapeutics, Inc. at 20 sites in 6 countries.

Completed

Finished. The study has ended and is not enrolling. Results may be posted on the official record.

Official record
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Trial summary

The goal of this clinical trial is to test the drug navenibart in participants with hereditary angioedema (HAE). One group of participants will get 1 dose of navenibart, and 2 other groups will get 2 doses of navenibart. Read more about this study

Who is it for?
Ages 18 years and older
Conditions the study is for
Hereditary Angioedema
What is being tested?
Navenibart
Type of treatment
Injection or infusion
Could I receive a placebo?
No, everyone receives an active treatment
How many people
29 participants
Where
20 sitesin 6 countries
Study dates
21 Feb 2023to 13 Mar 2025
Phase
Phase 1/2
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 years and older
  • All sexes
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • Documented diagnosis of HAE (type I or II). The following must be met:
  • Documented clinical history consistent with HAE (for example, subcutaneous or mucosal, nonpruritic swelling episodes without accompanying urticaria).
  • Experienced at least 2 HAE attacks during the Run-In period, as confirmed by an investigator based on meeting the protocol-specified definition of an HAE attack.

Who cannot join

  • Any concomitant diagnosis of another form of chronic angioedema, such as acquired C1 inhibitor deficiency, HAE with normal C1-INH (also known as HAE type III), idiopathic angioedema, or angioedema associated with urticaria.
  • Use of therapies prescribed for the prevention of HAE attacks prior to Screening:
  • lanadelumab within 90 days
  • berotralstat within 21 days
  • all other prophylactic therapies, within 7 days
  • Any exposure to angiotensin-converting enzyme inhibitors or any estrogen containing medications with systemic absorption (such as hormonal contraceptives or hormone replacement therapy) within 28 days prior to Screening.
  • Any exposure to androgens (for example, stanozolol, danazol, oxandrolone, methyltestosterone, testosterone) within 7 days prior to Screening.

Trial locations and contacts

20 sites in 6 countries.

20 sites in 6 countries

United States13 sites
  • Allergy & Asthma Clinic of Northwest Arkansas

    Bentonville, Arkansas, 72712

  • Allervie Clinical Research

    Birmingham, Alabama, 35209

  • Massachusetts General Hospital

    Boston, Massachusetts, 02114

  • Institute for Asthma and Allergy, PC

    Chevy Chase, Maryland, 20815

  • Optimed Research

    Columbus, Ohio, 43235

  • AARA Research Center

    Dallas, Texas, 75231

  • Penn State Health Milton S. Hershey Medical Center

    Hershey, Pennsylvania, 17033

  • Acuro Research, Inc.

    Little Rock, Arkansas, 72205

  • UC San Diego US HAEA Angioedema Center

    San Diego, California, 92122

  • Raffi Tachdjian MD, Inc

    Santa Monica, California, 90404

  • Medical Research of Arizona a Division of Allergy, Asthma & Immunology Associates, LTD.

    Scottsdale, Arizona, 85251

  • Washington University School of Medicine

    St Louis, Missouri, 63110

  • Allergy & Asthma Clinical Research

    Walnut Creek, California, 94598

Other trials in United States

Canada2 sites
  • University of Alberta

    Edmonton, Alberta, T6G 2R3

  • Ottawa Allergy Research Corporation

    Ottawa, Ontario, K1H 1E4

Other trials in Canada

United Kingdom2 sites
  • Addenbrooke's Hospital

    Cambridge, CB2 0QQ

  • St. James's Hospital

    Leeds, LS9 7TF

Other trials in United Kingdom

Bulgaria1 site
  • Diagnostical Consultative Center Convex Ltd.

    Sofia, 1680

Other trials in Bulgaria

Czechia1 site
  • Institute of Clinical Immunology/Allergology, Faculty Hospital

    Hradec Králové, 500 05

Other trials in Czechia

Germany1 site
  • Charité Universitätsmedizin Berlin

    Berlin, 12203

Other trials in Germany

About this study

Official title: A Phase 1b/2 Single and Multiple Dose Study to Assess the Safety, Tolerability, Clinical Activity, Pharmacokinetics, Pharmacodynamics, and Immunogenicity of STAR-0215 in Participants With Hereditary Angioedema (The ALPHA-STAR Trial)

The goal of this clinical trial is to test the drug navenibart in participants with hereditary angioedema (HAE). One group of participants will get 1 dose of navenibart, and 2 other groups will get 2 doses of navenibart. Researchers will study the effects of navenibart in participants with HAE as this is the first time that the drug has been given to participants with HAE.

Read the detailed description

This is a Phase 1b/2 single and multiple dose trial evaluating the safety, tolerability, clinical activity, pharmacokinetics, pharmacodynamics, and immunogenicity of subcutaneous administration of navenibart in participants with type I or type II HAE in 3 dose cohorts. The first cohort will receive 1 dose of navenibart; the second and third cohorts will receive 2 sequential doses. This is the first trial of navenibart in participants with HAE and the first evaluation of a multiple-dose regimen. After the required follow up period, participants who are willing and eligible to consent can begin participation in the long-term open label extension study (STAR-0215-202, ALPHA-SOLAR; NCT06007677).

Being tested
Navenibart
Keywords
HAE, Angioedema
Medical subject headings
Angioedemas, Hereditary, Angioedema

What participants receive

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

  • NavenibartDrug

    Also called STAR-0215

    Navenibart will be administered as a subcutaneous bolus injection.

Study groups in NCT05695248
Study groupRoleWhat they receive
Cohort 1 - Single DoseExperimentalParticipants received 1 dose (450 milligrams [mg]) of navenibart.
Receives: Drug: Navenibart
Cohort 2 - Multiple DoseExperimentalParticipants received 2 doses (600 mg, 300 mg) of navenibart administered 3 months apart.
Receives: Drug: Navenibart
Cohort 3 - Multiple DoseExperimentalParticipants received 2 doses (600 mg) of navenibart administered 1 month apart.
Receives: Drug: Navenibart

What is being measured

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

  1. Number of Participants Experiencing Treatment-emergent Adverse Events

    An adverse event was any untoward medical occurrence in a clinical investigation participant who was administered a pharmaceutical product that did not necessarily have a causal relationship with the treatment. A treatment-emergent adverse event was defined as any adverse event with an onset at the time of or following the start of treatment with study drug, or medical conditions present before the start of treatment that increased in severity or relationship at the time of or following the start of treatment. A summary of all Serious Adverse Events and Other Adverse Events (nonserious) regardless of causality is located in the 'Reported Adverse Events' section.

    Measured: Day 1 through Day 448 (Cohort 1), Day 531 (Cohort 2), Day 475 (Cohort 3)

Secondary outcomes (10)
  1. Percent Change From Baseline in Monthly Hereditary Angioedema (HAE) Attack Rate

    An attack was considered an HAE attack if at least 1 of the following criteria was met (per the investigator): peripheral angioedema (cutaneous swelling involving an extremity, the face, neck, torso, and/or genitourinary region); abdominal angioedema (abdominal pain, with or without abdominal distention, nausea, vomiting, or diarrhea); laryngeal angioedema (stridor, dyspnea, difficulty speaking, difficulty swallowing, throat tightening, or swelling of the tongue, palate, uvula, or larynx). The HAE attack rate was the number of unique investigator-confirmed HAE attacks per month.

    Measured: Baseline, Day 168 (Cohort 1), Day 251 (Cohort 2), Day 195 (Cohort 3)

  2. Number of Participants Who Were HAE Attack Free

    An attack was considered an HAE attack if at least 1 of the following criteria was met (per the investigator): peripheral angioedema (cutaneous swelling involving an extremity, the face, neck, torso, and/or genitourinary region); abdominal angioedema (abdominal pain, with or without abdominal distention, nausea, vomiting, or diarrhea); laryngeal angioedema (stridor, dyspnea, difficulty speaking, difficulty swallowing, throat tightening, or swelling of the tongue, palate, uvula, or larynx).

    Measured: Baseline through Day 168 (Cohort 1), Day 251 (Cohort 2), Day 195 (Cohort 3)

  3. Severity of HAE Attacks Experienced by Participants

    An attack was considered an HAE attack if at least 1 of the following criteria was met (per the investigator): peripheral angioedema (cutaneous swelling involving an extremity, the face, neck, torso, and/or genitourinary region); abdominal angioedema (abdominal pain, with or without abdominal distention, nausea, vomiting, or diarrhea); laryngeal angioedema (stridor, dyspnea, difficulty speaking, difficulty swallowing, throat tightening, or swelling of the tongue, palate, uvula, or larynx). All HAE attacks were classified by the investigator according to severity: mild (transient or mild discomfort); moderate (mild to moderate limitation in activity, some assistance with daily activities needed); severe (marked limitation in activity, assistance with daily activities required).

    Measured: Day 1 through Day 168 (Cohort 1), Day 251 (Cohort 2), and Day 195 (Cohort 3)

  4. Duration of HAE Attacks

    An attack was considered an HAE attack if at least 1 of the following criteria was met (per the investigator): peripheral angioedema (cutaneous swelling involving an extremity, the face, neck, torso, and/or genitourinary region); abdominal angioedema (abdominal pain, with or without abdominal distention, nausea, vomiting, or diarrhea); laryngeal angioedema (stridor, dyspnea, difficulty speaking, difficulty swallowing, throat tightening, or swelling of the tongue, palate, uvula, or larynx).

    Measured: Day 1 through Day 168 (Cohort 1), Day 251 (Cohort 2), and Day 195 (Cohort 3)

  5. Number of HAE Attacks Requiring On-demand Therapy

    An attack was considered an HAE attack if at least 1 of the following criteria was met (per the investigator): peripheral angioedema (cutaneous swelling involving an extremity, the face, neck, torso, and/or genitourinary region); abdominal angioedema (abdominal pain, with or without abdominal distention, nausea, vomiting, or diarrhea); laryngeal angioedema (stridor, dyspnea, difficulty speaking, difficulty swallowing, throat tightening, or swelling of the tongue, palate, uvula, or larynx).

    Measured: Day 1 through Day 168 (Cohort 1), Day 251 (Cohort 2), and Day 195 (Cohort 3)

  6. Time to First HAE Attack After First and Last Dosing

    An attack was considered an HAE attack if at least 1 of the following criteria was met (per the investigator): peripheral angioedema (cutaneous swelling involving an extremity, the face, neck, torso, and/or genitourinary region); abdominal angioedema (abdominal pain, with or without abdominal distention, nausea, vomiting, or diarrhea); laryngeal angioedema (stridor, dyspnea, difficulty speaking, difficulty swallowing, throat tightening, or swelling of the tongue, palate, uvula, or larynx). The time to first HAE attack was calculated by: ([First HAE attack or censor date] - First Treatment date) +1. If a participant did not have an HAE attack, they were censored to the end of study date.

    Measured: Day 1 through Day 168 (Cohort 1), Day 251 (Cohort 2), and Day 195 (Cohort 3)

  7. Proportion of HAE Attack-free Days

    An attack was considered an HAE attack if at least 1 of the following criteria was met (per the investigator): peripheral angioedema (cutaneous swelling involving an extremity, the face, neck, torso, and/or genitourinary region); abdominal angioedema (abdominal pain, with or without abdominal distention, nausea, vomiting, or diarrhea); laryngeal angioedema (stridor, dyspnea, difficulty speaking, difficulty swallowing, throat tightening, or swelling of the tongue, palate, uvula, or larynx). The proportion of HAE attack-free days was calculated by: (the number of HAE attack-free days/duration of evaluation period in days).

    Measured: Day 1 through Day 168 (Cohort 1), Day 251 (Cohort 2), and Day 195 (Cohort 3)

  8. Maximum Drug Concentration (Cmax) of Navenibart

    Blood samples were collected at designated timepoints to measure the Cmax of navenibart. Results reported as micrograms/milliliter (mcg/mL).

    Measured: Day 1 (pre-dose, 4 hours post dose) up to Day 168 (Cohort 1); Day 1 (pre-dose, 4 hours post dose) up to Day 251 (Cohort 2); Day 1 (pre-dose, 4 hours post dose) up to Day 195 (Cohort 3)

  9. Percent Change From Baseline in Plasma Levels of Cleaved High-molecular-weight Kininogen (cHMWK)

    Blood samples were collected to measure the plasma levels of cHMWK (a measure of plasma kallikrein activity). Results reported as percent change in percentage cHMWK (%cHMWK). A decrease in %cHMWK is reflective of the pharmacodynamic activity of navenibart.

    Measured: Baseline, Day 56 (Cohort 1), Day 90 (Cohort 2), Day 41 (Cohort 3)

  10. Number of Participants With Treatment-emergent Anti-drug Antibodies (ADAs) to Navenibart

    Blood samples were collected at designated timepoints to assess the formation of navenibart ADAs in serum.

    Measured: Day 1 (pre-dose) up to Day 168 (Cohort 1); Day 1 (pre-dose) up to Day 251 (Cohort 2); Day 1 (pre-dose) up to Day 195 (Cohort 3)

Timeline

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

  1. First posted23 Jan 2023
  2. Study start21 Feb 2023
  3. Primary completion13 Mar 2025
  4. Study completion13 Mar 2025

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
Treatment
Allocation
Non-randomised
Intervention model
Sequential
Masking
None (open label)
Enrolment
29 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT05695248
Sponsor's protocol ID
STAR-0215-201
Other IDs
2022-502953-32
Status last verified
Apr 2026
First submitted
6 Jan 2023
Last updated
8 May 2026
FDA-regulated drug
Yes
FDA-regulated device
No
Individual data sharing
No

Publications

  • Banerji A, Craig T, Sitz K, Li HH, Lumry W, Adatia A, Yang W, Jacobs JS, Tachdjian R, Soong W, Manning M, Wedner J, Savic S, Manson A, Valerieva A, Gunsior M, Mugundu G, Cohen T, Bernard K, VanEenwyk C, Joseph K, Best JM, Morabito C, Riedl MA. Open-label phase 1b/2 trial of navenibart, a long-acting plasma kallikrein inhibitor for hereditary angioedema. J Allergy Clin Immunol. 2026 May;157(5):1127-1135.e6. doi: 10.1016/j.jaci.2026.02.034. Epub 2026 Mar 5.

    PubMed 41794053

Questions about this trial

What is this clinical trial studying?

A Phase 1/2 study testing Navenibart in people with Hereditary Angioedema, run by Astria Therapeutics, Inc. at 20 sites in 6 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 3 inclusion and 7 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 8 May 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 20 sites in United States, Canada, United Kingdom, Bulgaria, Czechia and 1 more country. 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?

Yes. Results are posted in the registry (first posted 8 May 2026). 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?

Number of Participants Experiencing Treatment-emergent Adverse Events (time frame: Day 1 through Day 448 (Cohort 1), Day 531 (Cohort 2), Day 475 (Cohort 3)). 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 NCT05695248, 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 8 May 2026.

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