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INS1201

Phase 1

Duchenne Muscular Dystrophy | Gene therapy | Neurology |Insmed Incorporated|Trials Updated: Sep 16, 2026

INS1201 development status

Highest phase Phase 1
Registered trials 1 across 1 sponsor since Feb 2025

INS1201 target and mechanism

Molecular targetnull
Target classNull
ModalityGene therapy

Success Probability

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Market & Valuation

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Trial Design

CONTROLLEDDMCBiomarker
Total Trials1
Total Enrollment12

FDA Designations

No designations recorded

INS1201 clinical trials

INS1201 · 1 trial · 1 indication

Phase 1 1
NCT06817382A Study to Investigate the Safety and Biodistribution of a Single Intrathecal (IT) Injection of INS1201 in Ambulatory Males With Duchenne Muscular Dystrophy (DMD)Duchenne Muscular Dystrophy
ACTIVE NOT_RECRUITING12 Analytics
PHASE1ACTIVE NOT_RECRUITING
A Study to Investigate the Safety and Biodistribution of a Single Intrathecal (IT) Injection of INS1201 in Ambulatory Males With Duchenne Muscular Dystrophy (DMD)
Duchenne Muscular DystrophyUnlock trial analytics

Study Endpoints

Primary Endpoints

Parts 1 and 2: Incidence and Severity of Treatment Emergent Adverse Events (TEAEs)
Up to Week 96

Secondary Endpoints

Parts 1 and 2: Recommended Phase 2 Dose (RP2D) of INS1201
Week 16
Parts 1 and 2: Change From Baseline in Quantity of Micro-Dystrophin Deoxyribonucleic Acid (DNA) as Measured by Droplet Digital Polymerase Chain Reaction (ddPCR) at Weeks 16 and 48
Baseline, Weeks 16 and 48
Parts 1 and 2: Change From Baseline in Micro-Dystrophin Protein Expression as Measured by Quantitative Protein Analysis at Weeks 16 and 48
Baseline, Weeks 16 and 48
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Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Part 1: Cohort 1EXPERIMENTALParticipants aged 3 to \<5 years will receive a single dose level 1 of INS1201 by IT injection on Day 1.
Part 1: Cohort 2EXPERIMENTALParticipants aged 3 to \<5 years will receive a single dose level 2 of INS1201 by IT injection on Day 1.
Part 2: Cohort 3EXPERIMENTALParticipants aged 2 to \<3 years will receive a single dose level 1 of INS1201 by IT injection on Day 1.
Part 2: Cohort 4EXPERIMENTALParticipants aged 2 to \<3 years will receive a single dose level 2 of INS1201 by IT injection on Day 1.

Interventions

NameTypeDescription
INS1201GENETICSuspension for IT injection.
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Eligibility Criteria

Age Range2 Years to 4 Years
SexMALE
Healthy VolunteersNo
Study Sites10

Inclusion Criteria * Participant must be male at birth, 3 to \<5 years of age, inclusive (Part 1) and 2 to \<3 years of age (Part 2), at the time of legally authorized representative (LAR) signing and dating the informed consent form. * Ambulatory -as defined as the ability to walk at least 10 mete...

Countries:United States
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Recent Changes (Last 90 Days)

MEDIUMSep 16, 2026NCT06817382Status: RECRUITING → ACTIVE_NOT_RECRUITING
MEDIUMSep 16, 2026NCT06817382Status: RECRUITING → ACTIVE_NOT_RECRUITING
LOWJul 28, 2026NCT06817382lastUpdatePostDate: changed
LOWJul 28, 2026NCT06817382lastUpdatePostDate: changed

Frequently asked questions about INS1201

What is INS1201?

INS1201 is an investigational gene therapy being developed by Insmed Incorporated for Duchenne Muscular Dystrophy, a genetic muscle-wasting disorder. It is administered as a single intrathecal injection, meaning it is delivered into the fluid surrounding the spinal cord. INS1201 is in Phase 1 clinical development and has not been approved by the FDA.

What is INS1201 used for in Duchenne Muscular Dystrophy?

INS1201 is being studied as a treatment for Duchenne Muscular Dystrophy in ambulatory males. The Phase 1 trial enrolls males aged 2 years and older in the United States. Because it remains investigational, INS1201 is not approved for any indication and is available only through clinical research.

Who makes INS1201?

INS1201 is being developed by Insmed Incorporated, a biopharmaceutical company whose common stock trades on Nasdaq under the ticker INSM. Insmed is the sponsor of the Phase 1 study evaluating the gene therapy in ambulatory males with Duchenne Muscular Dystrophy.

What phase is INS1201 in?

INS1201 is in Phase 1 clinical development. Its single registered trial is a Phase 1 study of a one-time intrathecal injection in ambulatory males with Duchenne Muscular Dystrophy. The study is currently active but not recruiting, and INS1201 has not received FDA approval.

What clinical trials is INS1201 in?

INS1201 is being evaluated in one clinical trial, NCT06817382, titled a study to investigate the safety and biodistribution of a single intrathecal injection of INS1201 in ambulatory males with Duchenne Muscular Dystrophy. The Phase 1 trial has a planned enrollment of 12 participants, is controlled, and is active but not recruiting.