A Study of Imlifidase in Patients With Guillain-Barré Syndrome

An Open-label, Single Arm, Multi-centre, Phase II Study Investigating Safety, Tolerability, Efficacy, Pharmacodynamics and Pharmacokinetics of Imlifidase in Patients With Guillain-Barré Syndrome, in Comparison With Matched Control Patients

The study participants are patients which have been diagnosed with Guillain-Barré Syndrome (GBS) and are planned to receive treatment with intravenous immunoglobulin (IVIg). IVIg is a standard of care treatment for GBS patients. The patients in this study will be treated with the study medicine imlifidase on day 1, and with IVIg on days 3-7.

The purpose of this study is to investigate the safety and effectiveness of imlifidase in patients diagnosed with GBS.

Study Overview

• Status: Completed
• Conditions: Guillain-Barré Syndrome (GBS)
• Intervention / Treatment: Drug: Imlifidase

Detailed Description

This is an open-label, single arm, multi-centre, phase II study of imlifidase in combination with standard care IVIg in patients with GBS.

The study will recruit approximately 30 patients who are eligible for IVIg treatment based on current practice (i.e. GBS disability score >3 and within 10 days of onset of weakness). All patients will receive imlifidase (Day 1) prior to standard care IVIg.

There is growing body of evidence suggesting that GBS is an antibody-mediated disorder. In addition to supportive care, IVIg and Plasma Exchange (PE) are the two main immunological treatment options aimed at attenuating the autoreactive humoral immune response. Imlifidase is an IgG degrading enzyme with strict specificity. The hypothesis is that reduction of pathological antibodies may result in aborted progression, quicker recovery and less severe disease.

• Study Type: Interventional
• Enrollment (Actual): 30
• Phase: Phase 2

Contacts and Locations

Study Locations

• France
  • Bordeaux, France, 33076
    • CHU Bordeaux - Hôpital Pellegrin Tripode
  • Limoges, France, 87000
    • CHU de Limoges - Hopital Dupuytren
  • Marseille, France, 13385
    • Hôpital de la Timone - Centre de référence des maladies neuromusculaires et de la SLA
  • Montpellier, France, 34295
    • CHU de Montpellier, Hopital Gui de Chauliac
  • Nantes, France, 44093
    • Centre Hospitalier Universitaire de Nantes
  • Strasbourg, France, 67 098
    • Service de Neurologie, Hôpitaux Universitaires de Strasbourg
  • Paris
    • Le Kremlin-Bicêtre, Paris, France, 94270
      • CHU Le Kremlin-Bicêtre. Service Neurologie
• Netherlands
  • Amsterdam, Netherlands
    • Amsterdam UMC
  • Rotterdam, Netherlands, 3015 GD
    • Erasmus Medical Centre
• United Kingdom
  • Glasgow, United Kingdom
    • Queen Elizabeth University Hospital Glasgow
  • Oxford, United Kingdom
    • Oxford University Hospital

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

1. Signed Informed Consent obtained before any study-related procedures.
2. Willingness and ability to comply with the protocol.
3. Male or female aged ≥18 years at the time of screening.
4. GBS diagnosed according to National Institute of Neurological Disorders and Stroke (NINDS) diagnostic criteria (Asbury et al. 1990).
5. Onset of weakness due to GBS is not more than 10 days prior to screening.
6. Unable to walk unaided for >10 meters (grade ≥ 3 on GBS DS).
7. IVIg treatment being considered.
8. Women of child-bearing potential willing or able to use at least one highly effective contraceptive method from the day of treatment until at least 6 months after the dose of imlifidase if not abstinent. In the context of this study, an effective method is defined as those which result in low failure rate (i.e. less than 1% per year) when used consistently and correctly.
9. Men willing to use double-barrier contraception from the day of treatment until at least 2 months after the dose of imlifidase if not abstinent.

Exclusion Criteria:

1. Previous treatment with imlifidase.
2. Previous IVIg treatment within 28 days prior to imlifidase treatment.
3. Subjects who are being considered for, or already on, PE.
4. Women of child-bearing potential willing or able to use at least one highly effective contraceptive method from the screening visit until at least 180 days following imlifidase dosing.
5. Breastfeeding or pregnancy
6. Clinical evidence of a polyneuropathy of another cause e.g. diabetes mellitus (except mild sensory), alcoholism, vitamin deficiency, or porphyria.
7. Known selective immunoglobulin A (IgA) deficiency.
8. Hypersensitivity to IVIg or to any of the excipients.
9. Immunosuppressive treatment (e.g. azathioprine, cyclosporine, mycophenolate mofetil, tacrolimus, sirolimus or > 20 mg prednisolone daily) during the last month.
10. Subject known to have a severe concurrent disease, e.g. malignancy, severe cardiovascular disease and severe chronic obstructive pulmonary disease (COPD).
11. Any condition that in the opinion of the investigator could increase the subject's risk by participating in the study or confound the outcome of the study.
12. Known mental incapacity or language barriers precluding adequate understanding of the Informed Consent information and the study activities.
13. Subjects with clinical signs of ongoing infection.
14. Subjects should not have received other investigational drugs within 5 half-lives prior to imlifidase dosing.
15. Present or history of thrombotic thrombocytopenic purpura (TTP), or known familial history of TTP.
16. Positive PCR test for SARS-CoV-2 virus infection.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: N/A
• Interventional Model: Single Group Assignment
• Masking: None (Open Label)

Number of Arms

1

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Imlifidase; One (1) dose of imlifidase, 0.25 mg/kg, will be administered IV over 30 minutes, Day 1. IVIg, 0.4 g/kg, will be administered for 5 consecutive Days, starting on Day 3 at least 48 h after imlifidase administration.	Drug: Imlifidase; All subjects will receive imlifidase (Day 1) prior to standard care IVIg; Other Names: Hansa Medical-Immunoglobulin G degrading enzyme of Streptococcus pyogenes (HMED-IdeS), IdeS, IgG endopeptidase

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Guillain Barré Syndrome Disability Score (GBS DS) - Time to Improve by at Least 1 Grade	Efficacy is assessed as proportion of subjects with improvement of one (1) or more grades in disability outcome on the 6-point GBS DS over time. The 6-point Guillain Barré Syndrome disability score (GBS DS) is a widely accepted and easily obtainable scoring system used to assess disability status of GBS subjects. The DS score is as follows: 0=Healthy, 1=Minor symptoms and capable of running (subjects must be asked to run), 2=Able to walk independently 10 meters or more but unable to run, 3=Able to walk more than 10 meters across an open space with help, 4=Bedridden or chair bound, 5=Needing mechanical ventilation, 6=Dead	Baseline to Day 360
Guillain Barré Syndrome Disability Score (GBS DS) - Time to Improve by at Least 2 Grades	Efficacy is assessed as proportion of subjects with improvement of one (1) or more grades in disability outcome on the 6-point GBS DS over time. The 6-point Guillain Barré Syndrome disability score (GBS DS) is a widely accepted and easily obtainable scoring system used to assess disability status of GBS subjects. The DS score is as follows: 0=Healthy, 1=Minor symptoms and capable of running (subjects must be asked to run), 2=Able to walk independently 10 meters or more but unable to run, 3=Able to walk more than 10 meters across an open space with help, 4=Bedridden or chair bound, 5=Needing mechanical ventilation, 6=Dead	Baseline to Day 360
Guillain Barré Syndrome Disability Score (GBS DS) - Ability to Walk Unaided	Efficacy is assessed as proportion of subjects able to walk unaided (i.e. GBS DS=2) over time	Baseline to Day 360
Proportion of Patients Who Are Able to Run Over Time (GBS DS≤1)	Efficacy is assessed as proportion of patients able to run (i.e. Guillain Barré Syndrome disability score [GBS DS] ≤1) over time	Baseline to Day 360
Mean MRC Sum Score Over Time	Efficacy is assessed as Medical Research Council (MRC) sum score over time. The MRC sum score is widely used to assess the motor impairment in subjects with peripheral neuropathies. It is a sum score of power in 6 muscle groups on each side (abduction of arm, flexion of forearm, extension of the wrist, hip flexion, and extension of knee and dorsal flexion of the foot). The sum of these scores ranges from 0 (total paralysis) to 60 (normal power). It provides valuable information about the muscle strength. Change in MRC sum score helps in identification of GBS patients with treatment related fluctuation or exacerbation. The individual MRC grades are defined as follows: 0=No visible contraction,1=Visible contraction without movement of the limb, 2=Movement of the limb but not against gravity, 3=Movement against gravity (almost full range), 4=Movement against gravity and resistance, 5=Normal	Baseline until Day 180
Change From Baseline in MRC Sum Score Over Time	Efficacy is assessed as change in Medical Research Council (MRC) sum score. The MRC sum score is widely used to assess the motor impairment in subjects with peripheral neuropathies. It is a sum score of power in 6 muscle groups on each side (abduction of arm, flexion of forearm, extension of the wrist, hip flexion, and extension of knee and dorsal flexion of the foot). The sum of these scores ranges from 0 (total paralysis) to 60 (normal power). It provides valuable information about the muscle strength. Change in MRC sum score helps in identification of GBS patients with treatment related fluctuation or exacerbation. The individual MRC grades are defined as follows: 0=No visible contraction,1=Visible contraction without movement of the limb, 2=Movement of the limb but not against gravity, 3=Movement against gravity (almost full range), 4=Movement against gravity and resistance, 5=Normal	Baseline until Day 180
Mean R-ODS Over Time	The patients have rated their ability to perform different common activities using the Rasch-built overall disability score (R-ODS) questionnaire. R-ODS is a linearly weighted disease specific scale, which captures activities and social participation limitation in patients with immune-mediated neuropathies, including GBS. The questionnaire comprises 24 items ranging from ability to read a book or newspaper (as the easiest item to accomplish) to ability to run (most difficult item to accomplish). The response options for each item are: 0=Not possible, 1=Possible with effort, 2=Easy to perform. The obtained raw summed score is subsequently translated to a centile metric ranging from 0 (most severe disability) to 100 (no disability at all).	Baseline to Day 360
Change From Baseline in R-ODS Over Time	The patients have rated their ability to perform different common activities using the Rasch-built overall disability score (R-ODS) questionnaire. R-ODS is a linearly weighted disease specific scale, which captures activities and social participation limitation in patients with immune-mediated neuropathies, including GBS. The questionnaire comprises 24 items ranging from ability to read a book or newspaper (as the easiest item to accomplish) to ability to run (most difficult item to accomplish). The response options for each item are: 0=Not possible, 1=Possible with effort, 2=Easy to perform. The obtained raw summed score is subsequently translated to a centile metric ranging from 0 (most severe disability) to 100 (no disability at all).	Baseline to Day 360
Days in Hospital	The number of days the patients were admitted to hospital	Baseline to Day 360
Time in an ICU	Efficacy is assessed as time in an intensive care unit (ICU)	Baseline until Day 360
Need for Mechanical Ventilation		Baseline until Day 180
Patient's Health State Over Time as Assessed by EQ VAS	Quality of Life will be assessed using the EurQol group's EurQol - 5 dimension (EQ-5D) Health questionnaire. The EQ-5D consists of 2 parts: the EQ-5D descriptive system and the EQ visual analogue scale (EQ VAS). The EQ VAS records the patient's self-rated health on a vertical scale, where score 100 is 'The best health you can imagine' and score 0 is the 'The worst health you can imagine'.	Day 8, Day 15, Day 29, Day 57, Day 92, Day 180, and Day 360

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
PK Profile of Imlifidase: Cmax	Cmax=Maximum observed plasma concentration of imlifidase following dosing	Within 2 hours before imlifidase dose until Day 15
PK Profile of Imlifidase: Tmax	Tmax=Time point for maximum observed plasma concentration of imlifidase following dosing	Within 2 hours before imlifidase dose until Day 15
PK Profile of Imlifidase: AUC	AUC=Area under the imlifidase plasma concentration versus time curve	Within 2 hours before imlifidase dose until Day 15
PK Profile of Imlifidase: t1/2	t1/2=Terminal half-life of imlifidase	Within 2 hours before imlifidase dose until Day 15
PK Profile of Imlifidase: CL	CL=Clearance of imlifidase	Within 2 hours before imlifidase dose until Day 15
PK Profile of Imlifidase: V	V=Volume of distribution	Within 2 hours before imlifidase dose until Day 15
Pharmacodynamics - IgG Level in Serum Over Time	The pharmacodynamic (PD) effect of imlifidase is assessed as the elimination of IgG. IgG is cleaved by imlifidase in two steps, the first cut generates single-cleaved IgG (scIgG), and the second cut generates one F(ab')2 fragment and one Fc fragment. The IgG concentration measured in serum using the MSD technology is the sum of intact IgG and scIgG and a decrease in the measured IgG concentration therefore represents complete cleavage of the IgG molecule to Fc and F(ab')2 fragments. For the first 16 patients included in the trial a more frequent PD sampling schedule was conducted. After amending the protocol a less frequent PD sampling schedule was applied.	Within 2 hours before imlifidase dose until Day 15
Immunogenicity - Anti-imlifidase Antibodies (ADA) Over Time	Anti-imlifidase IgG antibodies (ADA) in serum.	Within 2 hours before imlifidase dose until Day 180

Collaborators and Investigators

• Sponsor: Hansa Biopharma AB
• Investigators: Study Chair: Clinical Operations, Hansa Biopharma AB

Study record dates

Study Major Dates

• Study Start (Actual): November 12, 2019
• Primary Completion (Actual): February 27, 2024
• Study Completion (Actual): February 27, 2024

Study Registration Dates

• First Submitted: April 30, 2019
• First Submitted That Met QC Criteria: May 8, 2019
• First Posted (Actual): May 9, 2019

Study Record Updates

• Last Update Posted (Actual): April 9, 2025
• Last Update Submitted That Met QC Criteria: March 21, 2025
• Last Verified: March 1, 2025

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Post-Infectious Disorders; Nervous System Diseases; Pathologic Processes; Neuromuscular Diseases; Chronic Disease; Disease Attributes; Autoimmune Diseases; Immune System Diseases; Peripheral Nervous System Diseases; Disease; Autoimmune Diseases of the Nervous System; Demyelinating Diseases; Polyneuropathies; Polyradiculoneuropathy; Syndrome; Guillain-Barre Syndrome; Immunologic Factors; Physiological Effects of Drugs; Immunoglobulins; Immunoglobulin G
• Other Study ID Numbers: 15-HMedIdeS-09

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No