RECRUITING

Evaluating the Pharmacokinetics, Pharmacodynamics, and Safety of Efgartigimod Administered Intravenously in Children with Generalized Myasthenia Gravis

Conditions

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Study Overview

This clinical trial focuses on testing the efficacy of different digital interventions to promote re-engagement in cancer-related long-term follow-up care for adolescent and young adult (AYA) survivors of childhood cancer.

Description

The purpose of this trial is to investigate the PK, PD, safety, and activity of efgartigimod IV in children and adolescents aged from 2 to less than 18 years of age with gMG. Trial details include: * The maximum trial duration for each individual participant will be approximately 28 weeks * The treatment duration will be 8 weeks for the dose-confirmatory part (Part A) and 18 weeks for the treatment response-confirmatory part (Part B)

Official Title

Open-label Uncontrolled Trial to Evaluate Pharmacokinetics, Pharmacodynamics, Safety, and Activity of Efgartigimod in Children from 2 to Less Than 18 Years of Age with Generalized Myasthenia Gravis

Quick Facts

Study Start:2021-10-26

Study Completion:2027-03

Study Type:Not specified

Phase:Not Applicable

Enrollment:Not specified

Status:RECRUITING

Study ID

NCT04833894

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Ages Eligible for Study:2 Years to 18 Years

Sexes Eligible for Study:ALL

Accepts Healthy Volunteers:No

Standard Ages:CHILD, ADULT

Inclusion Criteria	Exclusion Criteria
1. Ability of the participant and/or his/her legally authorized representative to understand the requirements of the trial and provide written informed consent/assent, if applicable (including consent/assent for the use and disclosure of research-related health information), willingness and ability to comply with the trial protocol procedures (including attending the required trial visits). 2. Male or female participants between 2 to less than 18 years of age at the time of providing informed consent/assent. Age groups are enrolled in a staggered fashion respectively: 6 participants in the 12 to less than 18 years of age group followed by 6 participants in the 2 to less than 12 years of age group at the time of providing informed consent/assent. 3. Diagnosed with Generalized Myasthenia Gravis (gMG) with confirmed documentation 4. Meeting the clinical criteria as defined by the Myasthenia Gravis Foundation of America (MGFA) class II, III, and IVa. 5. Eligible participants should have an unsatisfactory response (efficacy and/or safety) to immunosuppressants, steroids or acetylcholinesterase (AChE) inhibitors and should be on stable concomitant gMG therapy of adequate duration before screening. 6. Positive serologic test for acetylcholine receptor (anti-AChR) antibodies at screening (for younger participants (\<15kg) historical values can be used). 7. Contraceptive use should be consistent with local regulations regarding the methods of contraception for those participating in clinical trials. A subject is of childbearing potential if, in the opinion of the investigator, he/she is biologically capable of having children and is sexually active. 1. Male participants: Male participants must agree to not donate sperm from of providing informed consent/assent until they have completed the trial. 2. Female participants: Female adolescents of childbearing potential must have a negative serum pregnancy test at screening and a negative urine pregnancy test at baseline before investigational medicinal product (IMP) can be administered.	1. Participants with MGFA class I, IVb, and V. 2. Female adolescents of childbearing potential: Pregnancy or lactation, or the participant intends to become pregnant during the trial or within 90 days after the last dose of IMP. 3. Has any of the following medical conditions: 1. Clinically significant uncontrolled active or chronic bacterial, viral, or fungal infection at screening. 2. Any other known autoimmune disease that, in the opinion of the investigator, would interfere with an accurate assessment of clinical symptoms of myasthenia gravis or put the participant at undue risk. 3. History of malignancy unless deemed cured by adequate treatment with no evidence of recurrence for ≥3 years before the first administration of IMP. Participants with the following cancers can be included at any time: Adequately treated basal cell or squamous cell skin cancer; Carcinoma in situ of the cervix; Carcinoma in situ of the breast; Incidental histological findings of prostate cancer 4. Clinical evidence of other significant serious diseases, or have had a recent major surgery, or who have any other condition that, in the opinion of the investigator, could confound the results of the trial or put the participant at undue risk 4. Worsening muscle weakness secondary to concurrent infections or medications (aminoglycosides, fluoro-quinolones, beta-blockers, etc). 5. A documented lack of clinical response to plasma exchange (PLEX). 6. Received a live or live-attenuated vaccine fewer than 28 days before screening. Receiving an inactivated, subunit, polysaccharide, or conjugate vaccine any time before screening is not exclusionary. 7. Received a thymectomy \<3 months before screening or 1 is planned to be performed during the trial period. 8. The following results from these diagnostic assessments will be considered exclusionary: 9. Using the following prior or concomitant therapies: Use of an investigational product within 3 months or 5 half-lives (whichever is longer) before the first dose of IMP, Use of any monoclonal antibody within the 6 months before the first dose of IMP, Use of intravenous immunoglobulin (IVIg), administered subcutaneously or intramuscularly, or PLEX within 4 weeks before screening. 10. Total immunoglobulin (IgG) levels \<6 g/L below the lower limit of normal (LLN) according to the reference ranges of the central laboratory for participant by sex and age at screening. 11. A known hypersensitivity reaction to efgartigimod or any of its excipients. 12. Current participation in another interventional clinical trial or previous participation in an efgartigimod trial with at least 1 dose of IMP received. 13. History (within 12 months of screening) of current alcohol, drug, or medication abuse as assessed by the investigator.

Inclusion Criteria

Exclusion Criteria

1. Ability of the participant and/or his/her legally authorized representative to understand the requirements of the trial and provide written informed consent/assent, if applicable (including consent/assent for the use and disclosure of research-related health information), willingness and ability to comply with the trial protocol procedures (including attending the required trial visits).
2. Male or female participants between 2 to less than 18 years of age at the time of providing informed consent/assent. Age groups are enrolled in a staggered fashion respectively: 6 participants in the 12 to less than 18 years of age group followed by 6 participants in the 2 to less than 12 years of age group at the time of providing informed consent/assent.
3. Diagnosed with Generalized Myasthenia Gravis (gMG) with confirmed documentation
4. Meeting the clinical criteria as defined by the Myasthenia Gravis Foundation of America (MGFA) class II, III, and IVa.
5. Eligible participants should have an unsatisfactory response (efficacy and/or safety) to immunosuppressants, steroids or acetylcholinesterase (AChE) inhibitors and should be on stable concomitant gMG therapy of adequate duration before screening.
6. Positive serologic test for acetylcholine receptor (anti-AChR) antibodies at screening (for younger participants (\<15kg) historical values can be used).
7. Contraceptive use should be consistent with local regulations regarding the methods of contraception for those participating in clinical trials. A subject is of childbearing potential if, in the opinion of the investigator, he/she is biologically capable of having children and is sexually active.
1. Male participants: Male participants must agree to not donate sperm from of providing informed consent/assent until they have completed the trial.
2. Female participants: Female adolescents of childbearing potential must have a negative serum pregnancy test at screening and a negative urine pregnancy test at baseline before investigational medicinal product (IMP) can be administered.

1. Participants with MGFA class I, IVb, and V.
2. Female adolescents of childbearing potential: Pregnancy or lactation, or the participant intends to become pregnant during the trial or within 90 days after the last dose of IMP.
3. Has any of the following medical conditions:
1. Clinically significant uncontrolled active or chronic bacterial, viral, or fungal infection at screening.
2. Any other known autoimmune disease that, in the opinion of the investigator, would interfere with an accurate assessment of clinical symptoms of myasthenia gravis or put the participant at undue risk.
3. History of malignancy unless deemed cured by adequate treatment with no evidence of recurrence for ≥3 years before the first administration of IMP. Participants with the following cancers can be included at any time: Adequately treated basal cell or squamous cell skin cancer; Carcinoma in situ of the cervix; Carcinoma in situ of the breast; Incidental histological findings of prostate cancer
4. Clinical evidence of other significant serious diseases, or have had a recent major surgery, or who have any other condition that, in the opinion of the investigator, could confound the results of the trial or put the participant at undue risk
4. Worsening muscle weakness secondary to concurrent infections or medications (aminoglycosides, fluoro-quinolones, beta-blockers, etc).
5. A documented lack of clinical response to plasma exchange (PLEX).
6. Received a live or live-attenuated vaccine fewer than 28 days before screening. Receiving an inactivated, subunit, polysaccharide, or conjugate vaccine any time before screening is not exclusionary.
7. Received a thymectomy \<3 months before screening or 1 is planned to be performed during the trial period.
8. The following results from these diagnostic assessments will be considered exclusionary:
9. Using the following prior or concomitant therapies: Use of an investigational product within 3 months or 5 half-lives (whichever is longer) before the first dose of IMP, Use of any monoclonal antibody within the 6 months before the first dose of IMP, Use of intravenous immunoglobulin (IVIg), administered subcutaneously or intramuscularly, or PLEX within 4 weeks before screening.
10. Total immunoglobulin (IgG) levels \<6 g/L below the lower limit of normal (LLN) according to the reference ranges of the central laboratory for participant by sex and age at screening.
11. A known hypersensitivity reaction to efgartigimod or any of its excipients.
12. Current participation in another interventional clinical trial or previous participation in an efgartigimod trial with at least 1 dose of IMP received.
13. History (within 12 months of screening) of current alcohol, drug, or medication abuse as assessed by the investigator.

Contacts and Locations

Study Contact

Sabine Coppieters, MD

CONTACT

857-350-4834

ClinicalTrials@argenx.com

Study Locations (Sites)

Ann and Robert H Lurie Children's Hospital of Chicago - Main Hospital

Chicago, Illinois, 60611

United States

University of North Carolina at Chapel Hill

Chapel Hill, North Carolina, 27599

United States

University of Virginia (UVA) Health - Developmental Pediatrics Clinic

Charlottesville, Virginia, 22903

United States

Collaborators and Investigators

Sponsor: argenx

Study Record Dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Registration Dates

Study Start Date2021-10-26

Study Completion Date2027-03

Study Record Updates

Study Start Date2021-10-26

Study Completion Date2027-03

Terms related to this study

Additional Relevant MeSH Terms

Generalized Myasthenia Gravis