An Open-label Study to Evaluate the Safety, Tolerability, and Efficacy of Subcutaneous Zilucoplan in Participants With Generalized Myasthenia Gravis Who Were Previously Receiving Intravenous Complement Component 5 Inhibitors

Completed · Phase 3

Conditions studied: Generalized Myasthenia Gravis

In brief

The purpose of the study is to evaluate the safety and tolerability of switching from intravenous (IV) complement component 5 (C5) inhibitors to subcutaneous (SC) Zilucoplan in study participants with generalized myasthenia gravis (gMG)

Key facts

Study ID: NCT05514873
Run by: UCB Biopharma SRL
People needed: 26
Starts: 2022-10-31
Expected to finish: 2024-10-23
Last updated by the study team: 2025-09-03

Who can join

Age: 18 and older, up to 85. Sex: any. Healthy volunteers: not accepted.

You may qualify if…

Participant has been treated with an intravenous (IV) complement component 5 (C5) inhibitor approved for the treatment of generalized myasthenia gravis (gMG) at the recommended dose regimen for at least 3 months (for eculizumab) or 4 months (for ravulizumab) prior to Screening with a clinically stable disease as per the Investigator's judgment.
Participant is willing to switch from his/her current IV C5 inhibitor to subcutaneous (SC) zilucoplan (ZLP)
Participant has a documented diagnosis of gMG (Myasthenia Gravis Foundation of America; MGFA Class II-IVa) at Screening based on participant history and supported by previous evaluations
Participant has a well-documented record of positive serology for acetylcholine receptor binding autoantibodies prior to Screening
Participant has no more than a 2-point change in Myasthenia Gravis-Activities of Daily Living (MG-ADL) score at Baseline compared with the Screening Visit
Participant has had no change in corticosteroid dose during the Screening Period and no change in corticosteroid dose is anticipated to occur during the 12-week Main Treatment Period
Participant has had no change in immunosuppressive therapy, including dose, during the Screening Period and no change in immunosuppressive therapy is anticipated to occur during the 12-week Main Treatment Period
Participant has a record of vaccination with at least 1 dose of a quadrivalent meningococcal vaccine and meningococcal serotype B vaccine at least 14 days prior to the first dose of ZLP if not vaccinated within 3 years prior to the start of study medication
Male and/or female
A male participant is recommended to agree to use contraception during the study and for at least 40 days (5 half lives) after the last dose of study medication, and refrain from donating sperm during this period.
A female participant is eligible to participate if she is not pregnant; not breastfeeding, and at least one of the following conditions applies:
Not a woman of childbearing potential (WOCBP) OR
A WOCBP who agrees to follow the contraceptive guidance during the study and for at least 40 days (5 half lives) after the last dose of study medication.
Participant is capable of giving signed informed consent

You may not qualify if…

Participant has any medical or psychiatric condition that, in the opinion of the Investigator, could jeopardize or would compromise the participant's ability to participate in this study
Participant has a known hypersensitivity to any components of the study medication as stated in this protocol
Participant has had a thymectomy within 6 months prior to Baseline or has one scheduled to occur during the 12-week Main Treatment Period
Participant has a history of meningococcal disease
Participant has or has had a current or recent systemic infection within 2 weeks prior to Baseline or an infection requiring IV antibiotics within 4 weeks prior to Baseline
Participant has active malignancy (except curatively resected squamous or basal cell carcinoma of the skin) requiring surgery, chemotherapy, or radiation within the prior 12 months (participants with a history of malignancy who have undergone curative resection or otherwise not requiring treatment for at least 12 months prior to Screening with no detectable recurrence are allowed).
Participant has a lifetime history of suicide attempt (including an actual attempt, interrupted attempt, or aborted attempt), or has had suicidal ideation with at least some intent to act in the past 6 months as indicated by a positive response ("Yes") to either question 4 or question 5 of the "Screening/Baseline" version of the C-SSRS at Screening.
Participant has alanine transaminase (ALT), aspartate aminotransferase (AST), or alkaline phosphatase (ALP) >2.5x upper limit of normal (ULN)
Participant has bilirubin >1.5xULN (isolated bilirubin >1.5xULN is acceptable if bilirubin is fractionated and direct bilirubin <35%).
Participant has current unstable liver or biliary disease per Investigator assessment defined by the presence of ascites, encephalopathy, coagulopathy, hypoalbuminemia, esophageal or gastric varices, persistent jaundice, or cirrhosis.
QTc interval >450msec for male participants, QTc >470msec for female participants, or QTc >480 msec in participants with bundle branch block
Participant has had recent surgery requiring general anesthesia within 2 weeks prior to Screening or is expected to have surgery requiring general anesthesia during the 12-week Main Treatment Period
Participant has received a treatment with an experimental drug within 30 days or 5 half lives of the experimental drug (whichever is longer) prior to Baseline
Participant has received treatment with rituximab within 6 months prior to Baseline or treatment is planned to occur during the study
Participant has received treatment with intravenous immunoglobulin G (IVIG), SC immunoglobulin, or plasma exchange PLEX 4 weeks prior to Baseline or participant is on chronic IVIG, SC immunoglobulin, or PLEX
Participant has previously participated in this study or participant has previously been assigned to treatment in a study of the medication under investigation in this study
Participant has participated in another study of an investigational study medication (and/or an investigational device) within the previous 30 days or is currently participating in another study of an investigational study medication (and/or an investigational device)
Participant has known positive serology for muscle-specific kinase

Where it is running

Mg0017 50564 — Scottsdale, Arizona, United States
Mg0017 50559 — Los Angeles, California, United States
Mg0017 50593 — Rancho Mirage, California, United States
Mg0017 50099 — San Francisco, California, United States
Mg0017 50557 — O'Fallon, Illinois, United States
Mg0017 50556 — Chapel Hill, North Carolina, United States
Mg0017 50086 — Charlotte, North Carolina, United States
Mg0017 50076 — Columbus, Ohio, United States
Mg0017 50555 — Austin, Texas, United States
Mg0017 50304 — Dallas, Texas, United States
Mg0017 50111 — Seattle, Washington, United States
Mg0017 50569 — Greenfield, Wisconsin, United States

Full record on ClinicalTrials.gov

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