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Efzofitimod/kg

Phase 3

Pulmonary Sarcoidosis | Small molecule | Respiratory |aTyr Pharma, Inc.|Trials Updated: Jun 4, 2026

Target and mechanism

ModalitySmall molecule

Also known as efzofitimod

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLEDDMC
Total Trials3
Total Enrollment329

FDA Designations

No designations recorded

Clinical trial landscape

Efzofitimod/kg · 3 trials · 3 indications

Phase 3 1Phase 2 2
NCT05415137Efficacy and Safety of Intravenous Efzofitimod in Patients With Pulmonary SarcoidosisPulmonary Sarcoidosis
COMPLETED268 Analytics
PHASE3COMPLETED
Efficacy and Safety of Intravenous Efzofitimod in Patients With Pulmonary Sarcoidosis
Pulmonary SarcoidosisUnlock trial analytics

Study Endpoints

Primary Endpoints

Change from baseline in mean daily oral corticosteroid (OCS) dose at Week 48
Baseline to Week 48
Absolute change from baseline in forced vital capacity (FVC) in mL
24 weeks
Annual rate of decline in FVC in mL
24 weeks
Annual rate of decline in FVC in percent predicted
24 weeks
Change in HRCT fibrosis score
Baseline to Week 24
Number of Participants With Treatment Emergent Adverse Events (TEAEs) and Serious Adverse Events (SAEs)
Baseline up to Day 60

TEAEs were defined as adverse events (AEs) with an onset following administration of the first dose of study drug. AEs were defined as any untoward medical occurrence in a participant administered study drug and that does not necessarily have a causal relationship with the study drug. Worsening of a pre-existing medical condition should have been considered an AE if there was either an increase in severity, frequency, or duration of the condition or an association with significantly worse outcomes. SAEs were defined as any AE that, in the view of either the Investigator or Sponsor, resulted in any of the following outcomes as fatal, life-threatening, required in-participant hospitalization or prolongation of existing hospitalization, resulted in persistent or significant disability/incapacity, a congenital anomaly/birth defect, an important medical event. A summary of all SAEs and Other AEs (nonserious) regardless of causality is located in 'Reported Adverse Events' Section.

Secondary Endpoints

Change from baseline in KSQ-Lung score at Week 48
Baseline to Week 48
Steroid withdrawal rate
Baseline to Week 48
Change from baseline in absolute value of FVC at Week 48
Baseline to Week 48
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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Efzofitimod 3 mg/kgEXPERIMENTAL -
Efzofitimod 5 mg/kgEXPERIMENTAL -
PlaceboPLACEBO_COMPARATOR -
efzofitimod 450 mgEXPERIMENTALAdministered IV infusion
efzofitimod 270 mgEXPERIMENTALAdministered IV infusion
Efzofitimod 1 mg/kgEXPERIMENTALParticipants will receive single dose of efzofitimod 1 milligrams/kilograms (mg/kg) IV infusion on Day 1.

Interventions

NameTypeDescription
Efzofitimod 3 mg/kgDRUGEfzofitimod IV infusion every 4 weeks for a total of 12 doses
Efzofitimod 5 mg/kgDRUGEfzofitimod IV infusion every 4 weeks for a total of 12 doses
PlaceboDRUGPlacebo IV infusion every 4 weeks for a total of 12 doses
efzofitimod 450 mgDRUGIV infusion over approximately 60 minutes every 4 weeks
efzofitimod 270 mgDRUGIV infusion over approximately 60 minutes every 4 weeks
Efzofitimod 1 mg/kgDRUGConcentrate for solution for infusion
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites91

Inclusion Criteria: * Documented history of pulmonary sarcoidosis for at least 6 months, supported by the following evidence: documented histologically proven diagnosis of sarcoidosis by tissue biopsy and documented evidence of parenchymal lung involvement by historical radiological evidence * Evid...

Countries:United StatesBrazilFranceGermanyItalyJapanNetherlandsSpainUnited KingdomPuerto Rico
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Frequently asked questions about Efzofitimod/kg

What is efzofitimod used for?

Efzofitimod is an investigational therapy being studied for interstitial lung disease, pulmonary sarcoidosis, and severe pneumonia related to COVID-19. It is being developed by aTyr Pharma, Inc. (ticker ATYR) and is designed to address inflammatory lung conditions. The drug has been tested in clinical trials across these respiratory indications.

What phase is efzofitimod in?

Efzofitimod is in Phase 2 development for interstitial lung disease, with a Phase 2 trial also completed in severe COVID-19 pneumonia. A Phase 3 trial in pulmonary sarcoidosis has been completed. The drug is investigational and has not been approved by the FDA for any indication.

Who makes efzofitimod?

Efzofitimod is being developed by aTyr Pharma, Inc., which trades under the ticker ATYR. The company is responsible for the clinical development program across interstitial lung disease, pulmonary sarcoidosis, and severe COVID-19 pneumonia.

What clinical trials is efzofitimod in?

Efzofitimod has been studied in three registered trials. NCT05892614 is a recruiting Phase 2 study in systemic sclerosis-related interstitial lung disease. NCT05415137 is a completed Phase 3 trial in pulmonary sarcoidosis with 268 participants. NCT04412668 is a completed Phase 2 trial in severe COVID-19 pneumonia.

Is efzofitimod the same as ATYR1923?

Yes, efzofitimod was previously known as ATYR1923. It is also referred to by dose-specific names including efzofitimod 1 mg/kg, efzofitimod 3 mg/kg, and efzofitimod 450 mg. All of these names refer to the same investigational compound developed by aTyr Pharma.

What is efzofitimod used for in pulmonary sarcoidosis?

Efzofitimod is being evaluated as a treatment for pulmonary sarcoidosis, a inflammatory lung condition. A Phase 3 trial, NCT05415137, has been completed in this indication with 268 participants across the United States, Brazil, France, Germany, Italy, Japan, the Netherlands, Spain, and the United Kingdom.