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MRM-3379

Phase 1

Healthy Volunteers | Small molecule | Other |Mirum Pharmaceuticals, Inc.|Last Updated: Jul 17, 2026

Target and mechanism

Molecular targetPDE4D
Target classEnzyme
ModalitySmall molecule

Also known as [14C]-MRM-3379, Low dose of MRM-3379

Success Probability

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Market & Valuation

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Trial Design

UNCONTROLLED
Total Trials1
Total Enrollment8

FDA Designations

No designations recorded

Clinical trial landscape

MRM-3379 · 1 trial · 1 indication

Phase 1 1
NCT07712718A Study to Evaluate the Absorption, Distribution, Metabolism, and Excretion of [14C]-MRM-3379Healthy Volunteers
RECRUITING8 Analytics
PHASE1RECRUITING
A Study to Evaluate the Absorption, Distribution, Metabolism, and Excretion of [14C]-MRM-3379
Healthy VolunteersUnlock trial analytics

Study Endpoints

Primary Endpoints

Total radioactivity recovery of MRM-3379 in urine and feces
Up to 11 days post dose

Evaluate the cumulative and total radioactivity in urine and feces following administration of a single oral dose of radiolabeled MRM-3379.

Maximum observed concentration (Cmax) of MRM-3379 and 2 metabolites in plasma
Up to 11 days post dose
Time to maximum observed concentration (tmax) of MRM-3379 and 2 metabolites in plasma
up to 11 days post dose
Area under the concentration-time curve from time zero to the last quantifiable concentration (AUC0-tlast) of MRM-3379 and 2 metabolites in plasma
up to 11 days post dose
Maximum observed concentration (Cmax) of total radioactivity in plasma and whole blood
up to 11 days post dose
Time to maximum observed concentration (tmax) of total radioactivity in plasma and whole blood
up to 11 days post dose
Area under the concentration-time curve from time zero to the last quantifiable concentration (AUC0-tlast) of total radioactivity in plasma and whole blood
Up to 11 days post dose
Amount of MRM-3379 and 2 metabolites excreted in the urine (Ae) over sampling period
Up to 11 days post dose
Fraction of MRM-3379 and 2 metabolites excreted in the urine (Fe) as Ae/dose
Up to 11 days post dose
Renal clearance of MRM-3379 as Ae/AUC
Up to 11 days post dose

Secondary Endpoints

Assessment of metabolites in plasma and excreta by liquid chromatography-radiochemical-detection and subsequent mass spectrometry
Up to 11 days post dose
Number of subjects with treatment-related adverse events
Up to 11 days post dose
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Study Design & Arms

AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeBASIC_SCIENCE

Treatment Arms

ArmTypeDescription
Healthy Male VolunteersEXPERIMENTALParticipants in this arm will receive a single dose of 5 mg \[14C\]-MRM-3379.

Interventions

NameTypeDescription
[14C]-MRM-3379DRUGOral capsule administered on Day 1 only.
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Eligibility Criteria

Age Range18 Years to 55 Years
SexMALE
Healthy VolunteersYes
Study Sites1

Inclusion Criteria: 1. Male of any race, between 18 and 55 years of age, inclusive. 2. Body mass index between 18.0 and 32.0 kg/m2, inclusive, and a body weight between 50 and 110 kg, inclusive. 3. In good health, as determined by medical history, and as assessed by the investigator (or designee). ...

Countries:United States
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Recent Changes (Last 90 Days)

LOWJul 17, 2026NCT07712718NEW_TRIAL: changed
LOWJul 17, 2026NCT07712718NEW_TRIAL: changed

Frequently asked questions about MRM-3379

What is MRM-3379 used for in Fragile X Syndrome?

MRM-3379 is an investigational small molecule being studied for Fragile X Syndrome, a rare genetic condition. It is currently in Phase 2 clinical development, with an active trial evaluating its effects in male participants aged 13 years and older with Fragile X Syndrome.

What does MRM-3379 target?

MRM-3379 targets PDE4D, an enzyme involved in cellular signaling pathways. By inhibiting PDE4D, the drug aims to modulate these pathways, which may be relevant to the treatment of Fragile X Syndrome.

Who is developing MRM-3379?

MRM-3379 is being developed by Mirum Pharmaceuticals, Inc., a biopharmaceutical company traded on the NASDAQ under the ticker symbol MIRM. The company is conducting clinical trials to evaluate the drug's safety and efficacy.

What phase is MRM-3379 in?

MRM-3379 is in Phase 2 clinical development for Fragile X Syndrome. It is also being studied in a Phase 1 trial in healthy volunteers to evaluate its absorption, distribution, metabolism, and excretion. The drug is investigational and not yet approved.

What clinical trials is MRM-3379 in?

MRM-3379 is being studied in two clinical trials. NCT07209462 is a Phase 2 study in male participants with Fragile X Syndrome, and NCT07712718 is a Phase 1 study of [14C]-MRM-3379 in healthy male volunteers to assess its pharmacokinetics.

Is MRM-3379 the same as [14C]-MRM-3379?

MRM-3379 and [14C]-MRM-3379 are related forms of the same drug. [14C]-MRM-3379 is a radiolabeled version used in a Phase 1 study to track the drug's absorption, distribution, metabolism, and excretion in healthy volunteers.