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Mepolizumab in Episodic Angioedema With Eosinophilia

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Know the risks and potential benefits of clinical studies and talk to your health care provider before participating. Read our disclaimer for details. Identifier: NCT04128371
Recruitment Status : Recruiting
First Posted : October 16, 2019
Last Update Posted : July 21, 2022
Information provided by (Responsible Party):
National Institutes of Health Clinical Center (CC) ( National Institute of Allergy and Infectious Diseases (NIAID) )

Brief Summary:


Gleich syndrome is also called episodic angioedema with eosinophilia (EAE). People with EAE have episodes of swelling. They may also have itching, hives, fever, and weight gain. During episodes, the body has very high numbers of white blood cells, especially a kind called eosinophils. Researchers think a drug called mepolizumab could help.


To see if mepolizumab causes EAE symptoms to be less severe and happen less often.


People ages 18 or older with EAE.


Participants will be screened under NIH protocol 94-I-0079.

Participants will have 8 visits over about 6 months. The timing of some visits will depend on each participant s EAE episodes. Visits will include:

  • Medical history
  • Physical exam
  • Blood and urine tests
  • Optional bone marrow collection at first or second visit. For this, a needle will be inserted through the participant s hip bone into the marrow.

Participants will get mepolizumab 3 times over about 3 months. They will get their first dose when their eosinophils are at their lowest point. They will get the drug by IV. A needle will guide a thin plastic tube into an arm vein. The drug will be given through the tube over about 30 minutes.

Participants will keep a daily online log for about 3 months. The log will track their weight, temperature, and EAE symptoms. During the whole study, they will complete 2 online questionnaires about their symptoms. They will fill out 1 daily and 1 monthly.

Participants will have blood and urine tests 2-3 times a week. For these, they will go to their local doctor.

Condition or disease Intervention/treatment Phase
Eosinophilia Angioedema Biological: Nucala (mepolizumab) Phase 2

Detailed Description:

Episodic angioedema with eosinophilia (EAE), also known as Gleich s Syndrome,is a rare disorder characterized by recurrent episodes of urticaria, fever, angioedema, weight gain and dramatic eosinophilia that occur at 3- to 6-week intervals and resolve with spontaneous diuresis in the absence of therapy. Although the syndrome is often classified in the broad category of idiopathic hypereosinophilic syndrome (HES), EAE is a distinct eosinophilic syndrome that is remarkably homogeneous in clinical presentation. More recently, it has become apparent that there is multilineage cycling, involving lymphocytes and neutrophils in addition to eosinophils. Early studies described cyclic elevations of serum interleukin 5 (IL-5) preceding the rise in eosinophilia, and additional studies have shown cyclic elevations in other type II cytokines as well as in eosinophilic chemokines. Aberrant T cells with a CD3-CD4+ surface phenotype have also been detected in the majority of subjects with EAE. The cyclic nature of the disorder and the involvement of multiple cell lineages have made it difficult to determine the underlying cause of EAE.

We hypothesize that IL-5 driven eosinophilia is central to the pathogenesis of EAE. Suppression of eosinophil cycling by blocking IL-5 would help determine whether eosinophils are indeed the main drivers of the symptoms of angioedema and urticaria and pave the way for future mechanistic studies investigating the etiology of this unusual disorder. The purpose of this pilot study is to evaluate the effect of mepolizumab, a humanized antibody to IL-5, on eosinophil cycling in 12 subjects with EAE. Subjects with EAE will undergo screening on the National Institutes of Health protocol 94-I-0079 to establish the periodicity of their cycling (if not previously determined) and the optimal timing for the baseline visit. After screening, subjects will be followed closely with signs and symptoms recorded in a daily log and daily and monthly questionnaires, as well as complete blood counts and research blood collected for one cycle prior to administration of mepolizumab. Subjects will receive a total of 3 monthly administrations of mepolizumab at 700 mg, followed by drug de-escalation over 6 additional monthly administrations for subjects who demonstrate benefit from mepolizumab. All subjects will have a follow-up visit about 1 month after the last study administration of mepolizumab.

The primary efficacy endpoint will be reduction of symptoms and severity of symptoms after mepolizumab. Secondary endpoints will include reduction in peak eosinophils after mepolizumab, continued suppression of absolute eosinophil count and reduction in symptoms following monthly dosing of mepolizumab therapy.

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Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 15 participants
Allocation: N/A
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: Pilot Study of Mepolizumab in Episodic Angioedema With Eosinophilia
Actual Study Start Date : January 14, 2021
Estimated Primary Completion Date : March 31, 2023
Estimated Study Completion Date : March 31, 2023

Resource links provided by the National Library of Medicine

Drug Information available for: Mepolizumab

Arm Intervention/treatment
Experimental: 1
Subjects will receive mepolizumab 700 mg IV x 3 doses at approximately one month intervals, at predicted eosinophil nadir (2-3 weeks after peak), at study visits 4, 6, and 7.
Biological: Nucala (mepolizumab)
Mepolizumab is a fully humanized monoclonal antibody (IgG1, kappa mAb) supplied as 100 mg of lyophilized powder in sterile, single-dose vials. Mepolizumab 100 mg vials will be reconstituted with 1.2 ml sterile water for injection (according to the product labeling) and secondarily diluted in 100-250 ml of 0.9% normal saline (NaCl) for infusion (to a final concentration of 0.3-7.5 mg/ml).

Primary Outcome Measures :
  1. Reduction in the number and severity of clinical symptoms associated with EAE after 3 doses of mepolizumab (as compared to symptoms logged in the approximately monthly cycle preceding initiation of mepolizumab). [ Time Frame: Visit 8 ]
    Reduction in the number and severity of clinical symptoms associated with EAE after 3 doses of mepolizumab (as compared to symptoms logged in the approximately monthly cycle preceding initiation of mepolizumab).

Secondary Outcome Measures :
  1. Sustained reduction of eosinophilia after administration of mepolizumab (at Visit 8). [ Time Frame: Visit 8 ]
  2. A =75% reduction in peak blood eosinophil count following the first dose of mepolizumab (as compared to the peak eosinophil count in the cycle preceding initiation of mepolizumab therapy). [ Time Frame: Visits 3 and 4 ]

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

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Ages Eligible for Study:   18 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

A subject will be eligible for participation in the study only if all of the following criteria apply:

  1. The subject is male or female, aged 18 years or older.
  2. The subject has a documented diagnosis of EAE.
  3. The subject has symptoms of EAE in the cycle prior to screening, including but not limited to fever, swelling, hives or rashes, weight gain, muscle pain, and lymphadenopathy.
  4. Cycling of eosinophils is ongoing as indicated by a peak AEC greater than or equal to 1500/mm^3 during at least one cycle in the prior 3 months.
  5. If taking corticosteroids, the subject is able and willing to stay on a stable dose for 6 weeks prior to screening.
  6. The subject agrees to storage of study samples.
  7. The subject is able to provide informed consent.
  8. Females are eligible for this study if they are:

    • of non-childbearing potential (i.e., women who have had a hysterectomy or tubal ligation or are postmenopausal as defined by no menses in 1 year); OR
    • of childbearing potential but willing to practice effective contraception or abstinence during administration of the study drug and for 100 days (5 terminal half-lives) after administration of the study drug.
    • Not breastfeeding.

Participation of Women:

Pregnancy: The effects of mepolizumab on the developing human fetus are unknown. For this reason, women of childbearing potential must agree to use adequate contraception (see below for acceptable methods) prior to study entry, for the duration of study participation, and for >5 terminal half-lives (approximately 100 days) after administration of the last dose of study drug. Nonreproductive potential is defined as post-menopausal, male partner who has azoospermia or is surgically sterile (at least 6 weeks before screening) and is the sole sexual partner, surgical sterility, or a congenital or acquired condition that definitely prevents conception. Further, postmenopausal is defined as at least 12 consecutive months with no menses at age 50 or older, or a high follicle-stimulating hormone level in the postmenopausal range at ages 45-50 years in subjects not using hormonal contraception or hormone replacement therapy.

Females with reproductive potential must either practice complete and uninterrupted abstinence from heterosexual activity or use 2 of the following methods of contraception with their partners. The 2 methods must include either 2 barrier methods, or 1 barrier method and 1 non-barrier method, both of which must be consistently used:

Barrier Methods:

  1. Diaphragm with spermicide
  2. Cervical cap with spermicide or contraceptive sponge (for nulliparous subjects only)
  3. Male or female condom (cannot be used together)

Non-Barrier Methods

  1. An intrauterine device with a documented failure rate of <1%
  2. Hormonal contraception: pill (estrogen/progestin or progestin-only), patch, vaginal ring, rod implanted in the skin, or subcutaneous injection methods

Females of childbearing-potential must have a negative pregnancy test result prior to receiving mepolizumab at each on-site study visit. During the course of the study, if a woman becomes pregnant or suspects she is pregnant, she should inform the study staff and her primary care physician immediately. A pregnancy registry has been created for subjects who become pregnant while receiving the approved dose of mepolizumab (100 mg subcutaneous injection) for asthma.

Fertility: There is no fertility data in humans. Animal studies showed no adverse effects of anti-IL-5 treatment on fertility.


A subject will not be eligible to participate in the study if any of the following conditions are fulfilled at the time of screening:

  1. Treatment with immunosuppressive or immunomodulatory agents including but not limited to cyclosporine, interferon-alpha, azathioprine, methotrexate, and cyclophosphamide within the past 3 months.
  2. Treatment with biologics including but not limited to mepolizumab, IVIG, anti-TNF agents, rituximab, benralizumab, alemtuzumab, reslizumab, dupilumab, lebrikizumab, and omalizumab within 6 months or 5 half-lives (whichever is longer). Subjects who received rituximab at any time in the past must have normal B-cell numbers to participate.
  3. Co-morbid illness, alcohol or substance abuse, or any other condition (e.g., HIV, active hepatitis) that, in the opinion of the investigator, places the subject at undue risk by participating in the study.
  4. Treatment with a daily dose of corticosteroids >40 mg.

Co-enrollment Guidelines: Co-enrollment in other trials is restricted, other than enrollment on observational studies or those evaluating the use of a licensed medication. Study staff should be notified of co-enrollment as it may require the approval of the investigator.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT04128371

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Contact: Thomas W Brown, R.N. (301) 402-7823
Contact: Paneez Khoury, M.D. (301) 402-3673

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United States, Maryland
National Institutes of Health Clinical Center Recruiting
Bethesda, Maryland, United States, 20892
Contact: For more information at the NIH Clinical Center contact Office of Patient Recruitment (OPR)    800-411-1222 ext TTY8664111010   
Sponsors and Collaborators
National Institute of Allergy and Infectious Diseases (NIAID)
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Principal Investigator: Paneez Khoury, M.D. National Institute of Allergy and Infectious Diseases (NIAID)
Additional Information:
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Responsible Party: National Institute of Allergy and Infectious Diseases (NIAID) Identifier: NCT04128371    
Other Study ID Numbers: 200002
First Posted: October 16, 2019    Key Record Dates
Last Update Posted: July 21, 2022
Last Verified: July 18, 2022

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Studies a U.S. FDA-regulated Drug Product: Yes
Studies a U.S. FDA-regulated Device Product: No
Keywords provided by National Institutes of Health Clinical Center (CC) ( National Institute of Allergy and Infectious Diseases (NIAID) ):
Absolute Neutrophil Count
Gleich's Syndrome
Serum Interleukin 5
Additional relevant MeSH terms:
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Vascular Diseases
Cardiovascular Diseases
Skin Diseases, Vascular
Skin Diseases
Hypersensitivity, Immediate
Immune System Diseases
Leukocyte Disorders
Hematologic Diseases