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Efzofitimod /kg

Phase 3

Pulmonary Sarcoidosis | Small molecule | Respiratory |aTyr Pharma, Inc.|Last 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 Trials1
Total Enrollment268

FDA Designations

No designations recorded

Clinical trial landscape

Efzofitimod /kg · 2 trials · 2 indications

Phase 3 1Phase 2 1
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
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 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 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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Recent Changes (Last 90 Days)

MEDIUMJul 5, 2026NCT05415137TRIAL_REMOVED: changed
MEDIUMJul 5, 2026NCT05415137TRIAL_REMOVED: changed
MEDIUMJul 5, 2026NCT05415137TRIAL_REMOVED: changed
HIGHJun 4, 2026NCT05415137Status: ACTIVE_NOT_RECRUITING → COMPLETED
HIGHJun 4, 2026NCT05415137Status: ACTIVE_NOT_RECRUITING → COMPLETED
HIGHJun 4, 2026NCT05415137Status: ACTIVE_NOT_RECRUITING → COMPLETED
HIGHJun 4, 2026NCT05415137Status: ACTIVE_NOT_RECRUITING → COMPLETED
LOWMay 26, 2026NCT05415137primaryCompletionDate: changed
LOWMay 24, 2026NCT05415137studyFirstPostDate: changed

Frequently asked questions about Efzofitimod /kg

What is efzofitimod used for?

Efzofitimod is an investigational small molecule being developed for pulmonary sarcoidosis, SARS-CoV-2 (COVID-19) severe pneumonia, and interstitial lung disease. It is currently in Phase 3 clinical development for pulmonary sarcoidosis, with additional studies in other respiratory conditions.

Who makes efzofitimod?

Efzofitimod is being developed by aTyr Pharma, Inc., a biopharmaceutical company traded on the NASDAQ under the ticker symbol ATYR. The company is conducting clinical trials to evaluate the drug's safety and efficacy in multiple respiratory indications.

What phase is efzofitimod in?

Efzofitimod is in Phase 3 clinical development for pulmonary sarcoidosis. A Phase 3 trial has been completed, and additional Phase 2 studies have been conducted or are ongoing for other indications, including COVID-19 severe pneumonia and interstitial lung disease.

What clinical trials is efzofitimod in?

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

Is efzofitimod the same as ATYR1923?

Efzofitimod is also known as ATYR1923. The Phase 2 trial in COVID-19 severe pneumonia, NCT04412668, was titled 'Study to Evaluate the Safety and Efficacy of ATYR1923 (Efzofitimod) In Participants With Severe Pneumonia Related to COVID-19', confirming that both names refer to the same drug.

How is efzofitimod administered in clinical trials?

In the Phase 3 trial for pulmonary sarcoidosis, efzofitimod was administered intravenously. The trial was randomized, double-blind, and placebo-controlled, enrolling 268 participants across multiple countries including the United States, Brazil, France, Germany, Italy, Japan, Netherlands, Spain, and the United Kingdom.