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Gamunex-C

Phase 3

CIDP (Chronic Inflammatory Demyelinating Polyradiculoneuropathy) | Monoclonal antibody | Neurology |Grifols, S.A.|Last Updated: Jul 8, 2026

Target and mechanism

ModalityMonoclonal antibody

Also known as Gamunex-C, 10% Injectable Solution, Gamunex-C, 10% Injectable

Success Probability

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Market & Valuation

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Trial Design

CONTROLLED
Total Trials1
Total Enrollment40

FDA Designations

No designations recorded

Clinical trial landscape

Gamunex-C · 3 trials · 3 indications

Phase 3 2Phase 2 1
NCT07540221A Study to Evaluate the Pharmacokinetics and Safety of XEMBIFY Versus Gamunex-C in Participants With Chronic Inflammatory Demyelinating PolyradiculoneuropathyCIDP (Chronic Inflammatory Demyelinating Polyradiculoneuropathy)
RECRUITING40 Analytics
NCT04561115A Study to Evaluate the Pharmacokinetics, Safety, and Tolerability of Immune Globulin (Human) 10% (Gamunex-C) PEG Process (IVIG-PEG) Compared to Gamunex-C in Participants With Primary Humoral ImmunodeficiencyPrimary Immunodeficiency
COMPLETED33 Analytics
PHASE3RECRUITING
A Study to Evaluate the Pharmacokinetics and Safety of XEMBIFY Versus Gamunex-C in Participants With Chronic Inflammatory Demyelinating Polyradiculoneuropathy
CIDP (Chronic Inflammatory Demyelinating Polyradiculoneuropathy)Unlock trial analytics
PHASE3COMPLETED
A Study to Evaluate the Pharmacokinetics, Safety, and Tolerability of Immune Globulin (Human) 10% (Gamunex-C) PEG Process (IVIG-PEG) Compared to Gamunex-C in Participants With Primary Humoral Immunodeficiency
Primary ImmunodeficiencyUnlock trial analytics

Study Endpoints

Primary Endpoints

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
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
Week 1 to 16 of SC Phase
AUC (0-7): Area Under the Concentration Time Curve Over a Dosing Interval of Either Every 3 Weeks [AUC0-21 Days] or Every 4 Weeks [AUC0-28 Days] for Total Immunoglobulin G (IgG)
Pre-dose, within 10 minutes of last infusion completion, at 1, 3, 6, 24, 48 hours and 4, 7, 14 and 21 days (up to 3 weeks), and 28 days (up to 4 weeks - only for subjects on a 4-week dosing schedule) post-infusion

AUC (0-7 days) is calculated as AUC (0-21 days)/3 for subjects with a dosing frequency of every 3 weeks and as AUC(0-28 days)/4 for subjects with a dosing frequency of every 4 weeks.

Cmax: Maximum Concentration in a Dosing Interval for Total IgG
Pre-dose, within 10 minutes of last infusion completion, at 1, 3, 6, 24, 48 hours, and 4, 7, 14, 21 and 28 days post-infusion (up to 4 weeks)
All-Cause Mortality Rate Through Day 29
Up to Day 29

All-cause mortality rate is percentage of participants in each treatment group who experienced mortality up to Day 29.

Secondary Endpoints

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)
Rate of Serious Bacterial Infections (SBIs)
Baseline up to 6 months for each period, i.e., overall GC treatment phase and overall IVIG-PEG treatment phase with an aggregate duration of up to 12 months
Rate of Events Per Participant Per Year in Participants With Any Kind of Infection
Baseline up to 6 months for each period, i.e., overall GC treatment phase and overall IVIG-PEG treatment phase with an aggregate duration of up to 12 months
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Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Gamunex-C (IGIV-C 10%)EXPERIMENTALDuring 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.
Xembify (IGSC 20%)EXPERIMENTALApproximately 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.
Gamunex-CACTIVE_COMPARATORParticipants received Gamunex-C by means of an infusion pump at a dose of 200 to 800 mg/kg per infusion at an infusion rate of 1 mg/kg/min or up to 8 mg/kg/min depending on participant tolerance. The participant's usual mg/kg dose (given on either a 3 or 4 week repeating schedule) was the same mg/kg dose and schedule that the participant was receiving prior to entering screening. This mg/kg dose and schedule were used throughout the study duration. Gamunex-C was administered every 3 weeks (±4 days) or 4 weeks (±4 days), depending on the participant's prior IVIG dosing schedule. The duration of Gamunex-C treatment included the Gamunex-C PK Phase (up to 4 weeks) plus the additional Gamunex-C Run-in Phase (up to 4.5 months) for participants not receiving Gamunex-C or not on a stable dose of Gamunex-C upon entering the trial. The approximate maximum duration was up to 6 months.
IVIG-PEGEXPERIMENTALParticipants received IVIG-PEG by means of an infusion pump at a dose of 200 to 800 mg/kg per infusion at an infusion rate of 1 mg/kg/min or up to 8 mg/kg/min depending on participant tolerance. IVIG-PEG was administered every 3 weeks (±4 days) or 4 weeks (±4 days), depending on the participant's prior IVIG dosing schedule. The duration of IVIG-PEG treatment included the IVIG-PEG Treatment Phase (up to 4.5 months) and the IVIG-PEG PK Phase (up to 4 weeks), for an approximate maximum of up to 6 months.
GAMUNEX-C + Standard Medical TreatmentEXPERIMENTALParticipants received 2 grams per kilogram (g/kg) of GAMUNEX-C, which was capped to a maximum of 160 g infusion intravenously (IV) for participants weighing more than 80 kg on Day 1. The 2 g/kg net total dose was divided either into infusions of 500 mg/kg body weight over 4 days or 400 mg/kg body weight over 5 days as per investigator's decision. Participants received standard of care interventions as per Principal Investigator's discretion from Day 1 up to Day 29.
Standard Medical TreatmentACTIVE_COMPARATORParticipants received all standard of care interventions required as per Principal Investigator's discretion throughout the participant's hospitalization, from Day 1 to Day 29.

Interventions

NameTypeDescription
Gamunex-CBIOLOGICALImmune Globulin Injection (Human), 10% Caprylate/Chromatography Purified (IGIV-C 10%)
XembifyBIOLOGICALImmune Globulin Subcutaneous (Human), 20% Caprylate/Chromatography Purified (IGSC 20%)
IVIG-PEGBIOLOGICALIntravenous infusion.
Standard Medical TreatmentDRUGSMT per local policies or guidelines.
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites7

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 d...

Countries:United States
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Recent Changes (Last 90 Days)

LOWJul 8, 2026NCT07540221lastUpdatePostDate: changed
LOWJul 8, 2026NCT07540221lastUpdatePostDate: changed
LOWJun 24, 2026NCT07540221lastUpdatePostDate: changed
LOWJun 24, 2026NCT07540221lastUpdatePostDate: changed

Frequently asked questions about Gamunex-C

What is GAMUNEX-C used for?

GAMUNEX-C is an investigational immune globulin product being studied for use in chronic inflammatory demyelinating polyradiculoneuropathy (CIDP), chronic lymphocytic leukemia, multiple myeloma, non-Hodgkin lymphoma, primary immunodeficiency, and COVID-19. It is a monoclonal antibody product developed by Grifols, S.A. (NASDAQ: GRFS).

How does GAMUNEX-C work?

GAMUNEX-C is a monoclonal antibody product. It is a form of immune globulin that provides passive immunity by delivering antibodies to patients. The specific molecular target has not been disclosed in the available information.

Who makes GAMUNEX-C?

GAMUNEX-C is developed by Grifols, S.A., a biopharmaceutical company traded on NASDAQ under the ticker GRFS. The company is conducting clinical trials to evaluate the product's safety and efficacy across several indications.

What phase is GAMUNEX-C in?

GAMUNEX-C is in Phase 2 clinical development for COVID-19, with one completed Phase 2 trial. It is also being studied in Phase 3 trials for primary immunodeficiency, CIDP, and hematologic malignancies. It is investigational and not yet approved by the FDA.

What clinical trials is GAMUNEX-C in?

GAMUNEX-C has been studied in several trials. NCT04480424 is a completed Phase 2 trial in COVID-19. NCT04561115 is a completed Phase 3 trial in primary immunodeficiency. NCT07540221 is a recruiting Phase 3 trial in CIDP. NCT07582432 is a recruiting Phase 3 trial in chronic lymphocytic leukemia, multiple myeloma, or non-Hodgkin lymphoma.

Is GAMUNEX-C the same as Gamunex-C, 10% Injectable Solution?

Yes, GAMUNEX-C is also known as Gamunex-C, 10% Injectable Solution. The product is referred to by these alternative names in clinical trial documentation and regulatory filings.