An Open-Label, Multicenter Study to Evaluate the Pharmacokinetics and Safety of XEMBIFY Versus Gamunex-C in Participants With Chronic Inflammatory Demyelinating Polyradiculoneuropathy
Overview
- Phase
- Phase 3
- Status
- Recruiting
- Sponsor
- Grifols Therapeutics LLC
- Enrollment
- 40
- Locations
- 2
- Primary Endpoint
- AUC in the IV Phase: Steady-state area under the concentration-time curve (AUC) of total IgG over a 3-week intravenous dosing interval (τ) (i.e., AUC(0-21days) in participants with CIDP
Overview
Brief Summary
The main goal of the study is to find out whether XEMBIFY, given once a week under the skin, provides similar levels of immunoglobulin G in the blood over time as Gamunex-C, which is given into a vein once every 3 weeks in people with CIDP.
Participants with CIDP will first have up to 28 days of screening to make sure they can join the study. Those who qualify will then start a 19-week treatment period with Gamunex-C. During this period, they will receive Gamunex-C through a vein once every 3 weeks, for a total of 7 doses. Approximately, one week after their last Gamunex-C dose, they will begin a 16-week treatment period with XEMBIFY under the skin, once a week for a total of 16 doses. Blood samples will be collected during both treatment periods to measure IgG level in the blood.
Study Design
- Study Type
- Interventional
- Allocation
- Non Randomized
- Intervention Model
- Sequential
- Primary Purpose
- Treatment
- Masking
- None
Eligibility Criteria
- Ages
- 18 Years to — (Adult, Older Adult)
- Sex
- All
- Accepts Healthy Volunteers
- No
Inclusion Criteria
- •Have typical CIDP or a CIDP variant according to the 2021 criteria established by the European Academy of Neurology/Peripheral Nerve Society (EAN/PNS). The level of diagnostic certainty may be CIDP or possible CIDP.
- •Participants ≤ 90 kg in body weight and requiring an IGIV dose equivalent to 0.3-1.0 g/kg every three weeks (Q3W) inclusive and between 20-90 g of IGIV Q3W inclusive.
- •Clinically stable on IGIV, defined as no recent change in CIDP treatment or experienced a CIDP relapse requiring treatment, within 12 weeks prior to Screening and through baseline visit.
Exclusion Criteria
- •Diagnosis of polyneuropathy of any other cause (including multifocal motor neuropathy; monoclonal gammopathy of uncertain significance with anti-myelin-associated glycoprotein IgM antibodies; hereditary demyelinating neuropathy; polyneuropathy, organomegaly, endocrinopathy, monoclonal protein and skin changes syndrome; lumbosacral radiculoplexus neuropathy; polyneuropathy associated with diabetes mellitus; polyneuropathy associated with systemic illnesses; or drug or toxin induced polyneuropathy).
- •Severe diseases and conditions that are likely to interfere with evaluation of the study product or satisfactory conduct of the study such as the following:
- •current malignancy or history of allogeneic bone marrow/stem cell transplant,
- •cardiac insufficiency (New York Heart Association classes III/IV), cardiomyopathy, significant cardiac arrhythmia requiring treatment, unstable or advanced ischemic heart disease, congestive heart failure or severe hypertension
- •chronic kidney disease stage IV or V
- •an acquired medical condition that is known to cause secondary immune deficiency, such as chronic lymphocytic leukemia, lymphoma, multiple myeloma, chronic or recurrent neutropenia (absolute neutrophil count less than 1000/µL \[1.0 × 10\^9/L\]), or human immunodeficiency virus (HIV) infection/acquired immune deficiency syndrome
- •known bleeding disorders
- •severe skin disease at the planned injection sites
- •alcohol, drug or medication abuse, or
- •other disorders where IGSC therapy would be contraindicated during the study.
Arms & Interventions
Xembify (IGSC 20%)
Approximately 7 to 10 days after the last Gamunex-C dose, participants will enter a 16-week SC Phase, where they will receive XEMBIFY 0.456 g/kg once weekly for a total of 16 doses, up to a maximum dose of 41 g.
Intervention: Xembify (Biological)
Gamunex-C (IGIV-C 10%)
During the IV Phase, participants will receive Gamunex-C 1 g/kg, up to a maximum dose of 90 g, every 3 weeks for a total of seven doses. Gamunex-C may be administered over 1 day or divided into 2 consecutive daily doses of 0.5 g/kg each, except for dose #6, which will be administered as a single 1g/kg dose.
Intervention: Gamunex-C (Biological)
Outcomes
Primary Outcomes
AUC in the IV Phase: Steady-state area under the concentration-time curve (AUC) of total IgG over a 3-week intravenous dosing interval (τ) (i.e., AUC(0-21days) in participants with CIDP
Time Frame: Week 1 to 19 of IV Phase
AUC in the SC Phase: Steady-state AUC of total IgG over a weekly SC dosing interval (τ) (i.e., AUC(0-7days)) in participants with CIDP
Time Frame: Week 1 to 16 of SC Phase
Secondary Outcomes
- Steady-state mean trough (pre-dose) concentration of total IgG following IV administration of Gamunex-C 10% every 3 weeks SC administration of Xembify 20% once weekly(Day 1 through End of Study Visit (approximately 35 weeks))