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MRT5005

Phase 1

Cystic Fibrosis | Small molecule | Respiratory |Sanofi|Last Updated: Feb 9, 2026

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLEDDMC
Total Trials1
Total Enrollment42

FDA Designations

No designations recorded

Clinical trial landscape

MRT5005 · 1 trial · 1 indication

Phase 1 1
NCT03375047Study to Evaluate the Safety & Tolerability of MRT5005 Administered by Nebulization in Adults With Cystic FibrosisCystic Fibrosis
COMPLETED42 Analytics
PHASE1COMPLETED
Study to Evaluate the Safety & Tolerability of MRT5005 Administered by Nebulization in Adults With Cystic Fibrosis
Cystic FibrosisUnlock trial analytics

Study Endpoints

Primary Endpoints

Parts A, B and D: Number of Participants With Treatment-Emergent Adverse Events (TEAEs) and Treatment-Emergent Serious Adverse Events
From the first dose of study treatment administration (Day 1) up to 48 weeks (end of the follow-up period) after the last dose of study treatment administration (Part A: Day 337, Part B: Day 365 and Part D: Day 341)

An adverse event (AE) was any untoward medical occurrence in a clinical investigation participant administered a pharmaceutical product and that did not necessarily had a causal relationship with the study treatment. A serious adverse event (SAE) was any untoward medical occurrence (whether considered to be related to study treatment or not) that at any dose: resulted in death; or was life-threatening; or required inpatient hospitalization or prolongation of existing hospitalization; or resulted in persistent or significant disability/incapacity; or was a congenital abnormality/birth defect; or was an important medical event. The TEAEs were defined as events that were newly reported or reported to worsen in severity after the start of study treatment up to 48 weeks (end of follow-up period) after the last dose of study treatment administration.

Secondary Endpoints

Parts A, B and D: Absolute Change From Baseline in Percent Predicted Forced Expiratory Volume in 1 Second (ppFEV1)
Part A:BL, D1(8hPD), D2(24hPD), D3, D8, D15 and D29; Part B:BL, D1(6hPD), D2, D8(PrD and 6hPD), D9, D15(PrD and 6hPD), D16, D22(PrD and 6hPD), D23, D29(PrD and 6hPD), D30, D36, D43 and D57; Part D:BL, D1(2hPD), PrD on D2, D3, D4 and D5, D11, D18 and D32
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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Part A - SAD Group 1: MRT5005 8 mgEXPERIMENTALParticipants received single dose of MRT5005 8 milligrams (mg) by nebulization on Day 1.
Part A - SAD Group 2: MRT5005 16 mgEXPERIMENTALParticipants received single dose of MRT5005 16 mg by nebulization on Day 1.
Part A - SAD Group 3: MRT5005 20 mgEXPERIMENTALParticipants received single dose of MRT5005 20 mg by nebulization on Day 1.
Part A - SAD Group 4: MRT5005 24 mgEXPERIMENTALParticipants received single dose of MRT5005 24 mg by nebulization on Day 1.
Part A - SAD Groups: Pooled PlaceboPLACEBO_COMPARATORParticipants received single dose of placebo (normal saline) by nebulization on Day 1. Data were analyzed as a pooled population for all participants who received placebo in Part A SAD groups and reported in this arm.
Part B - MAD Group 1: MRT5005 8 mgEXPERIMENTALParticipants received MRT5005 8 mg once weekly by nebulization for 5 weeks (i.e., on Day 1, Day 8, Day 15, Day 22 and Day 29).
Part B - MAD Group 2: MRT5005 12 mgEXPERIMENTALParticipants received MRT5005 12 mg once weekly by nebulization for 5 weeks (i.e., on Day 1, Day 8, Day 15, Day 22 and Day 29).
Part B - MAD Group 3: MRT5005 16 mgEXPERIMENTALParticipants received MRT5005 16 mg once weekly by nebulization for 5 weeks (i.e., on Day 1, Day 8, Day 15, Day 22 and Day 29).
Part B - MAD Group 4: MRT5005 20 mgEXPERIMENTALParticipants received MRT5005 20 mg once weekly by nebulization for 5 weeks (i.e., on Day 1, Day 8, Day 15, Day 22 and Day 29).
Part B - MAD Groups: Pooled PlaceboPLACEBO_COMPARATORParticipants received placebo (normal saline) once weekly by nebulization for 5 weeks (i.e., on Day 1, Day 8, Day 15, Day 22 and Day 29). Data were analyzed as a pooled population for all participants who received placebo in Part B MAD groups and reported in this arm.
Part D: MRT5005 4 mgEXPERIMENTALParticipants received MRT5005 4 mg once daily by nebulization from Day 1 to Day 5.
Part D: PlaceboPLACEBO_COMPARATORParticipants received placebo (normal saline) once daily by nebulization from Day 1 to Day 5.

Interventions

NameTypeDescription
MRT5005DRUGNebulization of MRT5005
Normal salineDRUGNormal Saline for Inhalation
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites16

Inclusion Criteria: * Confirmed diagnosis of CF as defined by both of the following: * Two CF disease-causing cystic fibrosis transmembrane conductance regulator (CFTR) mutations in Class I or II (genotype confirmed at the screening visit). * Chronic sinopulmonary disease and/or gastrointestin...

Countries:United States
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Frequently asked questions about MRT5005

What is MRT5005 used for?

MRT5005 is an investigational small molecule being developed for the treatment of cystic fibrosis. It is administered by nebulization and is currently in clinical development for adults with this condition.

What does MRT5005 target?

The specific molecular target of MRT5005 has not been disclosed. It is a small molecule modality being studied for its potential to treat cystic fibrosis, a genetic respiratory condition.

Who makes MRT5005?

MRT5005 is being developed by Sanofi, a global biopharmaceutical company listed on the stock exchange under the ticker SNY.

What phase is MRT5005 in?

MRT5005 is in Phase 1 clinical development. It is an investigational drug and has not been approved by regulatory authorities. A Phase 1 trial has been completed to evaluate its safety and tolerability.

What clinical trials is MRT5005 in?

MRT5005 has been studied in one completed Phase 1 clinical trial, identified as NCT03375047. This trial evaluated the safety and tolerability of MRT5005 administered by nebulization in 42 adults with cystic fibrosis in the United States.

Is MRT5005 the same as any other drug?

No alternative names for MRT5005 have been reported. It is identified solely by its developmental code name MRT5005 in clinical trial records.