Recent Updates
Recently added Catalysts

Tanruprubart

Phase 3

Guillain-Barre Syndrome | Small molecule | Neurology |Annexon, Inc.|Trials Updated: Aug 25, 2026

Tanruprubart development status

Highest phase Phase 3
Registered trials 7 across 1 sponsor since Jan 2017

Tanruprubart target and mechanism

Molecular targetC1q
ModalitySmall molecule

Also known as ANX005

Success Probability

Subscribe to view

Market & Valuation

Subscribe to view

Trial Design

UNCONTROLLED
Total Trials6
Total Enrollment338

FDA Designations

FAST_TRACKORPHAN_DRUG

Tanruprubart clinical trials

Tanruprubart · 6 trials · 5 indications

Phase 3 2Phase 2 3Phase 1 1
NCT07020819An Open Label Clinical Study to Evaluate Tanruprubart (Also Commonly Known as ANX005) in Participants With Guillain-Barré Syndrome (FORWARD Study)Guillain-Barre Syndrome
RECRUITING30 Analytics
NCT04701164Efficacy and Safety of ANX005 in Subjects With Guillain-Barré SyndromeGuillain-Barre Syndrome
COMPLETED242 Analytics
PHASE3RECRUITING
An Open Label Clinical Study to Evaluate Tanruprubart (Also Commonly Known as ANX005) in Participants With Guillain-Barré Syndrome (FORWARD Study)
Guillain-Barre SyndromeUnlock trial analytics
PHASE3COMPLETED
Efficacy and Safety of ANX005 in Subjects With Guillain-Barré Syndrome
Guillain-Barre SyndromeUnlock trial analytics

Study Endpoints

Primary Endpoints

Area Under the Tanruprubart Serum Concentration-time Curve to the Last Sample (AUC0-t)
Up to Day 15
Observed Time to Maximum Observed Serum Concentration (Cmax) (Tmax) of Tanruprubart
Up to Day 15
GBS Disability Score (GBS-DS) at Week 8
Week 8
Number of Participants with Adverse Events
Through Month 6

Number participants recently diagnosed with GBS who experience adverse events.

Number of Participants With Treatment-emergent Adverse Events (TEAEs)
Day 1 through Day 71

An adverse event (AE) was any untoward medical occurrence in a participant who had been administered a pharmaceutical product. An AE did not necessarily have a causal relationship with the product and therefore could be any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease temporally associated with the use of a pharmaceutical product. An AE could arise with any use, route of administration, formulation, dose (including an overdose), or when used in combination with another pharmaceutical product. A TEAE was an AE with an onset date/time after the first infusion of ANX005 until the end of the study. A summary of serious and all other non-serious adverse events regardless of causality is located in the Adverse Events module.

Maximum Change From Baseline in Hemoglobin Levels
Baseline up to Day 71

Maximum change from Baseline was calculated as the maximum post-Baseline value observed up to Day 71 minus the Baseline value. Baseline was defined as the last non-missing observation recorded before the first dose of ANX005.

Change From Baseline in Lactate Dehydrogenase Levels at Day 71
Baseline, Day 71

Change from Baseline was calculated as the post-Baseline value at Day 71 minus the Baseline value. Baseline was defined as the last non-missing observation recorded before the first dose of ANX005.

Change From Baseline in Percentage of Reticulocytes/Total Cells Count at Day 71
Baseline, Day 71

Change from Baseline was calculated as the post-Baseline value at Day 71 minus the Baseline value. Baseline was defined as the last non-missing observation recorded before the first dose of ANX005.

Change From Baseline in Haptoglobin Levels at Day 71
Baseline, Day 71

Change from Baseline was calculated as the post-Baseline value at Day 71 minus the Baseline value. Baseline was defined as the last non-missing observation recorded before the first dose of ANX005.

Change From Baseline in Total Bilirubin Levels at Day 71
Baseline, Day 71

Change from Baseline was calculated as the post-Baseline value at Day 71 minus the Baseline value. Baseline was defined as the last non-missing observation recorded before the first dose of ANX005.

Change From Baseline in Indirect Bilirubin Levels at Day 71
Baseline, Day 71

Change from Baseline was calculated as the post-Baseline value at Day 71 minus the Baseline value. Baseline was defined as the last non-missing observation recorded before the first dose of ANX005.

Number of Participants Who Experienced Treatment-Emergent Adverse Events
Up to Week 36
Actual Dose of ANX005 Administered on Day 1
Day 1
Actual Dose of ANX005 Administered on Week 22
Week 22
Area Under the Concentration Versus Time Curve From Time 0 to t (AUC0-t) of ANX005 at Day 1
Pre-dose up to 4 hours post-dose on Day 1
CSF Free Complement Component 1q (C1q) at Day 1
Predose at Baseline (Day 1)
Blood Free C1q at Day 1
Predose at Baseline (Day 1)
Change From Baseline in Complement C4a in CSF at Week 24
Baseline, Week 24
Change From Baseline in Complement C4a in CSF at Week 36
Baseline, Week 36
Change From Baseline in CSF NfL Level at Week 24
Baseline, Week 24
Change From Baseline in CSF NfL Level at Week 36
Baseline, Week 36
Change From Baseline in Blood NfL Level at Week 24
Baseline, Week 24
Change From Baseline in Blood NfL Level at Week 36
Baseline, Week 36
Safety and tolerability of ANX005 when administered in combination with IVIg: incidence of TEAEs, SAEs, AE's
6 months

As measured by incidence of TEAEs, SAEs, AE's related to ANX005, SAE's related to ANX005, Grade 3 or higher AEs, Grade 3 or higher AEs related to ANX005, AEs leading to study or treatment discontinuation.

Secondary Endpoints

Change From Baseline in Free Component of Complement Complex (C1q) Protein Concentration in Serum
Baseline up to Day 15
Change from Baseline in Medical Research Council (MRC) Sumscore at Week 1
Baseline, Week 1
Medical Research Council (MRC) Sum Score at Week 8
Week 8
Unlock Study Endpoints

Study Design & Arms

AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
TanruprubartEXPERIMENTALParticipants will receive a single 30 mg/kg intravenous (IV) infusion of tanruprubart on Day 1.
ANX005 Treatment Group - Dose 1EXPERIMENTALParticipants will receive a single IV infusion of ANX005 (Dose 1) on Day 1.
ANX005 Treatment Group - Dose 2EXPERIMENTALParticipants will receive a single IV infusion of ANX005 (Dose 2) on Day 1.
Placebo GroupPLACEBO_COMPARATORParticipants will receive a single IV infusion of placebo on Day 1.
ANX005EXPERIMENTALParticipants will receive two once-weekly doses of ANX005 at specific time points
Open Label Treatment ArmEXPERIMENTALOne (1) dose of ANX005, 75 mg/kg, will be administered IV. IVIg, 0.4 g/kg, will be administered for 5 consecutive Days.

Interventions

NameTypeDescription
TanruprubartDRUGSolution for IV infusion.
ANX005DRUGSolution for intravenous infusion
PlaceboDRUGSolution for intravenous infusion
Intravenous immunoglobulinDRUGinvestigational drug
Unlock Study Design Details

Eligibility Criteria

Age Range12 Years to 85 Years
SexALL
Healthy VolunteersNo
Study Sites13

Key Inclusion Criteria: * Diagnosis of GBS according to the National Institute of Neurological Disorders and Stroke Diagnostic Criteria for GBS. * Onset of GBS-related weakness ≤10 days before start of infusion on Day 1 * GBS-disability score (DS) score of 3, 4, or 5 at screening and before start o...

Countries:United StatesDenmarkBangladeshPhilippinesAustraliaAustriaBulgariaCanada
Unlock Eligibility Criteria

Recent Changes (Last 90 Days)

MEDIUMSep 25, 2026NCT04514367TRIAL_REMOVED: changed
MEDIUMSep 25, 2026NCT04514367TRIAL_REMOVED: changed
MEDIUMSep 25, 2026NCT04514367TRIAL_REMOVED: changed
MEDIUMJul 31, 2026NCT04691570TRIAL_REMOVED: changed
MEDIUMJul 31, 2026NCT04691570TRIAL_REMOVED: changed
MEDIUMJul 31, 2026NCT04691570TRIAL_REMOVED: changed

Frequently asked questions about Tanruprubart

What is Tanruprubart used for?

Tanruprubart is an investigational small molecule being developed for the treatment of Guillain-Barre Syndrome, a neurological disorder. It is currently in Phase 3 clinical development and has not been approved by the FDA. The drug has received Fast Track and Orphan Drug designations from the FDA.

What does Tanruprubart target?

Tanruprubart targets C1q, a protein involved in the complement system, which is part of the immune response. By targeting C1q, the drug aims to modulate the immune system's activity in Guillain-Barre Syndrome. This mechanism is being studied in an ongoing Phase 3 clinical trial.

Who makes Tanruprubart?

Tanruprubart is being developed by Annexon, Inc., a biopharmaceutical company listed on the stock exchange under the ticker symbol ANNX. The company is conducting clinical trials to evaluate the drug's safety and efficacy in patients with Guillain-Barre Syndrome.

What phase is Tanruprubart in?

Tanruprubart is currently in Phase 3 clinical development. It is an investigational drug, meaning it has not been approved by the FDA for commercial use. The drug has received Fast Track and Orphan Drug designations, which are intended to expedite its development and review process.

What clinical trials is Tanruprubart in?

Tanruprubart is being studied in an open-label, uncontrolled Phase 3 clinical trial with the identifier NCT07020819, known as the FORWARD Study. This trial is recruiting participants with Guillain-Barre Syndrome in the United States and Denmark, with a planned enrollment of 30 participants aged 12 years and older.

Is Tanruprubart the same as ANX005?

Yes, Tanruprubart is also commonly known as ANX005. The clinical trial NCT07020819, which evaluates the drug in Guillain-Barre Syndrome, explicitly refers to Tanruprubart as ANX005. Both names refer to the same investigational drug being developed by Annexon, Inc.