Efficacy and Safety of Ravulizumab in Chinese Adults Participants With Generalized Myasthenia Gravis (gMG)

September 9, 2026 updated by: Alexion Pharmaceuticals, Inc.

An Open-label, Single-arm, Multi-center, Interventional Study to Evaluate the Efficacy, Safety, Pharmacokinetics, Pharmacodynamics, and Immunogenicity of Ravulizumab in Chinese Adult Patients With Generalized Myasthenia Gravis (gMG)

The primary purpose of this study is to evaluate the efficacy, safety, pharmacokinetics, pharmacodynamics, and immunogenicity of ravulizumab in Chinese adult participants with Acetylcholine receptor (AChR) + Generalized Myasthenia Gravis (gMG).

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Recruiting

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Estimated)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
20

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Phase 3

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.

Study Locations

  • China
      • Beijing, China, 100053
        • Recruiting
        • Research Site
      • Changchun, China, 130021
        • Not yet recruiting
        • Research Site
      • Fuzhou, China, 350001
        • Not yet recruiting
        • Research Site
      • Jinan, China, 250012
        • Not yet recruiting
        • Research Site
      • Shanghai, China, 200040
        • Recruiting
        • Research Site
      • Shijiazhuang, China, 050000
        • Recruiting
        • Research Site
      • Taiyuan, China, 030001
        • Recruiting
        • Research Site
      • Tianjin, China, 300050
        • Not yet recruiting
        • Research Site
      • Wuhan, China, 430030
        • Not yet recruiting
        • Research Site
      • Zhengzhou, China, 450000
        • Recruiting
        • Research Site

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.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion (key)

  • Confirmed generalized MG: Diagnosis ≥6 months before screening, anti-AChR antibody positive, and supportive diagnostic evidence (e.g., abnormal SFEMG/RNS or response to anticholinesterase therapy).
  • Disease severity: MGFA Class II-IV at screening.
  • Symptoms threshold: MG-ADL ≥6 at screening and on Day 1.
  • Meningococcal vaccination: Up to date within 3 years or vaccinated before first dose to mitigate risk with complement inhibition.
  • Body weight: ≥40 kg.
  • Vaccinated against meningococcal infections within the 3 years prior to, or at the time of, initiating study drug.

Exclusion (key)

  • Thymic disease:

    • Untreated thymic malignancy/carcinoma/thymoma excluded.
    • Prior thymic malignancy allowed only if treatment completed >5 years, no recurrence in last 5 years, and clear CT/MRI within 6 months.
    • Prior benign thymoma allowed if confirmed benign, treatment >12 months ago, no recurrence in last 12 months, and clear CT/MRI within 6 months; otherwise follow malignancy rules.
    • Thymectomy within the last 12 months

  • Infection risk:

    • History of meningococcal disease or unresolved infection, or active systemic infection within 14 days of Day 1 excluded.
    • Persistent/recurrent infections in past 12 months that add risk
    • HIV, active HBV (HBsAg+ or anti-HBc+ with anti-HBs-), or active HCV (unless documented successful treatment/SVR)

  • Safety/medical status:

    • Hypersensitivity to study drug components (including murine proteins)
    • Recent hospitalization ≥24 hours within 28 days of screening
    • Substance use disorder per DSM within 12 months.
    • Recent/other malignancy within 5 years (except as above for thymic).

  • Prior/Concomitant Therapy

    • Complement inhibitor within < 5 half-lives before Day 1.
    • Human neonatal Fc receptor (FcRn) inhibitor within < 5 half-lives before Day 1.
    • Rituximab, ocrelizumab or other B cell-depleting therapy within ≤ 6 months (180 days) before Day 1.
    • Periodic (chronic) administration of PP/PE, or IVIg as maintenance therapy received or scheduled within ≤ 6 months before Day 1

  • Key labs:

    • ALT >2× ULN, direct bilirubin >2× ULN.
    • eGFR <30 mL/min/1.73 m² or on dialysis.
    • Any other clinically significant lab abnormality making participation unsafe.

Note: Other protocol-defined criteria may apply and should be verified during full eligibility review.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Non-Randomized
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Experimental: Ravulizumab
Participants will receive ravulizumab for up to 26 weeks.
Drug: Ravulizumab
Participants will receive ravulizumab via intravenous (IV) infusion.

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Time Frame
Change From Baseline in Myasthenia Gravis Activities of Daily Living Profile (MG-ADL) Total Score at Week 26
Time Frame: Baseline, Week 26
Baseline, Week 26

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Time Frame
Change From Baseline in Quantitative Myasthenia gravis (QMG) Total Score at Week 26
Time Frame: Baseline, Week 26
Baseline, Week 26
Number of Participants With Reduction by >=5 Points From Baseline in QMG Total Score at Week 26
Time Frame: Baseline up to Week 26
Baseline up to Week 26
Number of Participants With Reduction by >=3 Points From Baseline in MG-ADL Total Score at Week 26
Time Frame: Baseline up to Week 26
Baseline up to Week 26
Change From Baseline in Revised Myasthenia Gravis Quality of Life 15-Item Scale (MG-QoL15r) Total Score at Week 26
Time Frame: Baseline, Week 26
Baseline, Week 26
Change From Baseline in Neurological Quality of Life (Neuro-QoL) Fatigue Score at Week 26
Time Frame: Baseline, Week 26
Baseline, Week 26
Serum Ravulizumab Concentration
Time Frame: Day 1 up to Week 26
Day 1 up to Week 26
Change From Baseline in Serum Free C5 Concentration
Time Frame: Baseline, Week 34
Baseline, Week 34
Number of Participants With Anti-Drug Antibodies (ADAs)
Time Frame: Baseline up to Week 34
Baseline up to Week 34
Number of Participants With Treatment-emergent Adverse Events (TEAEs), Treatment-emergent Serious Adverse Events (TESAEs) and Adverse Events of Special Interests (AESIs)
Time Frame: Baseline up to Week 34
Baseline up to Week 34

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Alexion Pharmaceuticals, Inc.

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 Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
July 20, 2026

Primary Completion (Estimated)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
August 17, 2027

Study Completion (Estimated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
August 17, 2027

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
May 13, 2026

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
May 13, 2026

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
May 19, 2026

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
September 11, 2026

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
September 9, 2026

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
September 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • D9281C00003
  • ALXN1210-MG-326 (Other Identifier: Alexion)

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

YES

IPD Plan Description

Alexion has a public commitment to allow requests for access to study data and will be supplying a protocol, CSR, and plain language summaries.

IPD Sharing Supporting Information Type

  • STUDY_PROTOCOL
  • SAP
  • CSR

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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