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mRNA-3927

Phase 1

Propionic Acidemia | RNA therapy | Rare Disease |Moderna, Inc.|Trials Updated: Mar 23, 2026

mRNA-3927 development status

Highest phase Phase 1
Registered trials 2 across 1 sponsor since Nov 2019

Success Probability

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Market & Valuation

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Trial Design

UNCONTROLLEDDMC
Total Trials2
Total Enrollment127

FDA Designations

No designations recorded

mRNA-3927 clinical trials

mRNA-3927 · 2 trials · 1 indication

Phase 1 2
NCT05130437A Study to Assess the Long-term Safety and Clinical Activity of mRNA-3927 in Participants Previously Enrolled in the mRNA-3927-P101 StudyPropionic Acidemia
RECRUITING50 Analytics
NCT04159103Open-Label Study of mRNA-3927 in Participants With Propionic AcidemiaPropionic Acidemia
RECRUITING77 Analytics
PHASE1RECRUITING
A Study to Assess the Long-term Safety and Clinical Activity of mRNA-3927 in Participants Previously Enrolled in the mRNA-3927-P101 Study
Propionic AcidemiaUnlock trial analytics
PHASE1RECRUITING
Open-Label Study of mRNA-3927 in Participants With Propionic Acidemia
Propionic AcidemiaUnlock trial analytics

Study Endpoints

Primary Endpoints

Number of Participants with Adverse Events (AEs), Serious AEs (SAEs), and AEs Leading to Discontinuation
Baseline through End of Study Visit (up to 8 years)
Part 1: Number of Participants with Treatment-emergent Adverse Event (TEAE), Serious Adverse Events (SAE) and TEAEs Leading to Discontinuation
Day 1 (initial mRNA-3927 dose) up to Week 150 (End of Study)
Part 2: Change in Annualized Frequency of Clinical Event Committee (CEC)-adjudicated Metabolic Decompensation Events (MDEs) During 12-month Treatment Period With mRNA-3927 Compared to Annualized Frequency of CEC-adjudicated MDE During Pretreatment Period
Pretreatment period (12 months before consent to first mRNA-3927 dose in the study) up to Month 12
Part 3: Number of Participants with TEAEs, SAEs, Adverse Events (AEs) of Special Interest (AESIs) and TEAEs Leading to Discontinuation
Day 1 up to Week 73

Secondary Endpoints

Annualized Frequency of Investigator-reported Metabolic Decompensation Events (MDEs)
Baseline through End of Study Visit (up to 8 years)
Annualized Frequency of Investigator-reported MDE-related Hospitalizations
Baseline through End of Study Visit (up to 8 years)
Annualized Frequency of Investigator-reported PA-related Hospitalizations
Baseline through End of Study Visit (up to 8 years)
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Study Design & Arms

AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
mRNA-3927EXPERIMENTALParticipants will receive the applicable dose identified during Study mRNA-3927-P101 (NCT04159103) on Day 1. The dose can be adjusted based on Sponsor recommendation.
Part 1 (Dose Optimization), Part 2 (Pivotal Study), and Part 3 (Infants)EXPERIMENTALPart 1 (Dose Optimization): Participants (≥1 year of age) will receive single dose of mRNA-3927 by intravenous (IV) infusion every 2 weeks (Q2W) or every 3 weeks (Q3W) for up to 10 doses. Part 2 (Pivotal Study): Participants (≥1 year of age) will receive single dose of mRNA-3927 (identified during Dose Optimization Phase) by IV infusion Q2W for up to 26 doses or approximately 12 months. Part 3: Participants (\<1 year of age) will receive single dose of mRNA-3927 (identified during Dose Optimization Phase) by IV infusion Q2W for up to 26 doses or approximately 12 months.

Interventions

NameTypeDescription
mRNA-3927BIOLOGICALmRNA-3927 dispersion for IV infusion
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Eligibility Criteria

Age Range1 Year to N/A
SexALL
Healthy VolunteersNo
Study Sites22

Inclusion Criteria: * Participated in Study mRNA-3927-P101. * Completed the EOT/ET visit in Study mRNA-3927-P101 and enroll in this study such that the first dose in this study is planned to be within 14±3 days of the last dose of mRNA-3927 in the mRNA-3927-P101 study. Exclusion Criteria: * Not e...

Countries:United StatesCanadaFranceJapanNetherlandsSaudi ArabiaSpainUnited Kingdom
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Frequently asked questions about mRNA-3927

What is mRNA-3927 used for?

mRNA-3927 is an investigational RNA therapy being developed for the treatment of propionic acidemia, a rare inherited metabolic disorder. It is designed as a disease-modifying approach for patients with this condition. The therapy is currently in Phase 1 clinical development and has not been approved for any indication.

Who is developing mRNA-3927?

mRNA-3927 is being developed by Moderna, Inc., which trades on the Nasdaq under the ticker symbol MRNA. Moderna is the sponsor of the clinical program evaluating the therapy in patients with propionic acidemia.

What phase is mRNA-3927 in?

mRNA-3927 is in Phase 1 clinical development. Two Phase 1 trials are currently recruiting participants, and no trials have been completed. The program remains investigational, and the therapy has not received regulatory approval for any indication.

What clinical trials is mRNA-3927 in?

mRNA-3927 is being evaluated in two Phase 1 trials: NCT04159103, an open-label study in participants with propionic acidemia, and NCT05130437, a long-term safety and clinical activity study for participants previously enrolled in the mRNA-3927-P101 study. Both trials are recruiting and together plan to enroll 127 participants across the United States, Canada, France, Japan, Netherlands, Saudi Arabia, Spain, and the United Kingdom.

Is mRNA-3927 FDA approved?

No, mRNA-3927 is not FDA approved. It is an investigational therapy in Phase 1 clinical development for propionic acidemia. Both of its clinical trials are currently recruiting, and no trials have been completed, so the therapy remains under study and is not available as an approved treatment.