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AT-1501

Phase 2

Kidney Transplant Rejection | Small molecule | Nephrology |Eledon Pharmaceuticals, Inc.|Last Updated: Jul 22, 2026

Success Probability

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Market & Valuation

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Trial Design

RandomizedACTIVE_CONTROLLEDDMC
Total Trials2
Total Enrollment259

FDA Designations

No designations recorded

Clinical trial landscape

AT-1501 · 4 trials · 3 indications

Phase 2 3Phase 1 1
NCT06126380Long-Term Safety and Efficacy of Tegoprubart in Kidney Transplant RecipientsKidney Transplant Rejection
ENROLLING BY_INVITATION132 Analytics
NCT05983770Safety and Efficacy of Tegoprubart in Patients Undergoing Kidney TransplantationKidney Transplant Rejection
COMPLETED127 Analytics
NCT04322149Multiple Doses of AT-1501-A201 in Adults With ALSAmyotrophic Lateral Sclerosis
COMPLETED54 Analytics
PHASE2ENROLLING BY_INVITATION
Long-Term Safety and Efficacy of Tegoprubart in Kidney Transplant Recipients
Kidney Transplant RejectionUnlock trial analytics
PHASE2COMPLETED
Safety and Efficacy of Tegoprubart in Patients Undergoing Kidney Transplantation
Kidney Transplant RejectionUnlock trial analytics
PHASE2COMPLETED
Multiple Doses of AT-1501-A201 in Adults With ALS
Amyotrophic Lateral SclerosisUnlock trial analytics

Study Endpoints

Primary Endpoints

Safety and Tolerability - Incidence of Treatment Emergent Adverse Events
Assessed from date of enrollment through Month 48

Incidence of treatment-emergent serious adverse events (TESAEs), treatment-emergent adverse events (TEAEs), and treatment-emergent AEs of special interest (TEAEoSI).

Safety and Tolerability - Kidney Transplant Medication Side Effects
Assessed from date of enrollment through Month 48

Kidney transplant medication side effects using the Modified Transplant Symptom Occurrence and Symptom Distress Scale-59 (MTSOSD) at baseline and 12, 24, 36, and 48 months.

eGFR at 12 months
Assessed from date of transplant through Day 364 (Month 12)

Estimated Glomerular Filtration Rate (eGFR) at 12 months post-transplant

Safety and Tolerability
Up to 18 Weeks

Incidence of adverse events (AEs) reported as number of participants with at least one TEAE (Treatment Emergent Adverse Event) and at least one SAE (Serious Adverse Event).

Safety Incidences
Through study completion, an average up to 20 months

Incidence of treatment emergent adverse events (TEAEs), serious adverse events (SAEs), and Adverse Events of Special Interest (AESIs)

Pharmacokinetic- PK profile
Day 1 and at steady state Month 3

PK profile of the first dose of AT 1501 and at steady state Area under the plasma concentration-time curve from time 0 to the last quantifiable concentration (Ct), calculated using noncompartmental analysis (AUC0-t)

Pharmacokinetic- Area under the plasma concentration
Day 1 and at steady state Month 3

Area under the plasma concentration versus time curve from time 0 extrapolated to infinity, calculated using noncompartmental analysis (AUC0-inf)

Pharmacokinetic- Cmax
Day 1 and at steady state Month 3

Maximum observed plasma concentration (Cmax)

Pharmacokinetic- Tmax
Day 1 and at steady state Month 3

Time to reach maximum observed plasma concentration (Tmax)

Pharmacokinetic- Ke
Day 1 and at steady state Month 3

Terminal elimination rate constant (Ke)

Pharmacokinetic- (t1/2)
Day 1 and at steady state Month 3

Terminal phase half-life (t1/2)

Pharmacokinetic- CL
Day 1 and at steady state Month 3

Clearance (CL)

Pharmacokinetic- (Vdss)
Day 1 and at steady state Month 3

Volume of distribution at steady state (Vdss)

Secondary Endpoints

The proportion of patient and graft survival at 12, 24, 36, and 48 months
Assessed from date of enrollment through Month 48
The proportion of participants with Graft function impairment at 12, 24, 36, and 48 months
Assessed from date of enrollment through Month 48
Proportion of participants with BPAR at 12, 24, 36, and 48 months
Assessed from date of enrollment through Month 48
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Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
AT-1501EXPERIMENTALAT-1501 20 mg/kg administered every 3 weeks IV + MMF 1000 mg per os (orally) (PO) twice daily (BID) or MPS 720 mg PO BID + Corticosteroids 5 mg of prednisone PO once daily (QD) or equivalent
TacrolimusACTIVE_COMPARATORTacrolimus dosed PO BID with the dose titrated to maintain a trough concentration of 6-8 ng/mL+ MMF 1000 mg PO BID or MPS 720 mg PO BID + Corticosteroids 5 mg of prednisone PO QD or equivalent
InvestigativeEXPERIMENTALAT-1501 monoclonal antibody targeting CD40L given as an IV infusion
ComparatorACTIVE_COMPARATORTacrolimus administered BID, targeting a whole blood trough concentration of 6-12 ng/mL until Month 6, and 6-8 ng/mL thereafter
AT-1501 Single ArmEXPERIMENTALAT-1501 monoclonal antibody targeting CD40L given as an IV infusion

Interventions

NameTypeDescription
AT-1501DRUGAT-1501 20 mg/kg administered every 3 weeks IV + MMF 1000 mg PO twice daily (BID) or MPS 720 mg PO BID + Corticosteroids 5 mg of prednisone PO once daily (QD) or equivalent
TacrolimusDRUGTacrolimus dosed PO BID with the dose titrated to maintain a trough concentration of 6-8 ng/mL+ MMF 1000 mg PO BID or MPS 720 mg PO BID + Corticosteroids 5 mg of prednisone PO QD or equivalent
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Eligibility Criteria

Age Range18 Years to 100 Years
SexALL
Healthy VolunteersNo
Study Sites43

Inclusion Criteria: * Successfully completed qualifying Parent study, where entry into the OLE was offered; * Continue to be able to understand the key components of the study as described in the written ICF, and is willing and able to provide written informed consent; * Agree not to participate in...

Countries:United StatesAustraliaBrazilCanadaFranceGermanySpainUnited Kingdom
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Recent Changes (Last 90 Days)

LOWMay 26, 2026NCT05027906primaryCompletionDate: changed
LOWMay 26, 2026NCT06126380primaryCompletionDate: changed
LOWMay 24, 2026NCT05027906studyFirstPostDate: changed
LOWMay 24, 2026NCT06126380studyFirstPostDate: changed

Frequently asked questions about AT-1501

What is AT-1501 used for?

AT-1501, also known as tegoprubart, is an investigational small molecule being developed for amyotrophic lateral sclerosis (ALS) and for the prevention of rejection in kidney transplant patients. It is currently in Phase 2 clinical trials for these indications.

What does AT-1501 target?

AT-1501 is a small molecule that targets CD40 ligand, a protein involved in immune system activation. By blocking this target, it aims to modulate immune responses, which is relevant for treating autoimmune conditions like ALS and for preventing organ transplant rejection.

Who makes AT-1501?

AT-1501 is being developed by Eledon Pharmaceuticals, Inc., a biopharmaceutical company traded on the NASDAQ under the ticker symbol ELDN. The company is conducting clinical trials to evaluate the drug's safety and efficacy.

What phase is AT-1501 in?

AT-1501 is in Phase 2 clinical development. It has completed a Phase 2 trial in ALS and a Phase 2 trial in kidney transplant rejection, and an additional Phase 2 trial is currently enrolling by invitation for long-term safety and efficacy in kidney transplant recipients.

What clinical trials is AT-1501 in?

AT-1501 has been studied in several clinical trials. NCT04322149 was a completed Phase 2 trial in ALS. NCT05027906 is a recruiting Phase 1 trial for kidney transplant rejection prevention. NCT05983770 was a completed Phase 2 trial in kidney transplant rejection, and NCT06126380 is a Phase 2 trial enrolling by invitation for long-term safety and efficacy.

Is AT-1501 the same as tegoprubart?

Yes, AT-1501 is also known as tegoprubart. Clinical trials such as NCT05983770 and NCT06126380 use the name tegoprubart to refer to the same investigational drug being developed by Eledon Pharmaceuticals.