Medical Information Only. Always consult your healthcare provider before enrolling in any clinical trial.
A Study to Learn About Salanersen's (BIIB115) Effects on Movement and Its Safety When Given Before Symptoms Appear in Babies With Genetically Diagnosed Spinal Muscular Atrophy (SMA)
NCT07221669 · View on ClinicalTrials.gov ↗
Study Summary
In this study, researchers will learn more about the effects and safety of BIIB115, also known as salanersen. Specifically, researchers will learn more about how salanersen works in babies who have been diagnosed with SMA through genetic testing but have not yet started showing signs or symptoms. Most people with SMA have changes in a gene called survival motor neuron 1, also known as SMN1. These changes lower the amount of SMN protein in their bodies. Without enough of this protein, motor neurons and muscles cannot work properly. A similar gene called SMN2 can help replace some of the lost SMN protein in the body. Salanersen works by helping the SMN2 gene to make more SMN protein. In this study, participants will have either 2 SMN2 copies or 3 SMN2 copies. The higher the copy number, the less severe the participant's SMA is. The main goal of this study is to see if starting salanersen before signs or symptoms appear can prevent signs or symptoms of SMA or make them less severe. Researchers will use different tests to learn if motor symptoms are changing, including the World Health Organization (WHO) motor milestones. The main questions researchers want to answer in this study are: * How many participants with 2 copies of the SMN2 gene can sit without support at 12 months? * How many participants with 3 copies of the SMN2 gene can walk alone at 18 months? Researchers will also learn more about: * The effects on participants' motor symptoms and how many new movement milestones participants achieve. * How many participants stay free of SMA symptoms * How much salanersen gets into the fluid surrounding the brain and spinal cord. * How much salanersen gets into the blood. * How many participants have adverse events or serious adverse events. Adverse events are health problems that may or may not be caused by the study drug. This study will be done as follows: * First, participants will be screened to check if they can join the study. The screening period will b
Conditions Studied
Interventions
- DRUG Salanersen
Study Locations (2)
Texas
- Neurology Rare Disease Center — Flower Mound
Virginia
- Childrens Hospital of the Kings Daughter Norfolk — Norfolk
Trial Details
| Field | Value |
|---|---|
| Enrollment Target | 30 participants |
| Start Date | 2026-01-30 |
| Est. Completion | 2032-05-29 |
| Phase | Phase 3 |
Interested in This Trial?
Always speak with your doctor before enrolling in a clinical trial.
Full Details on ClinicalTrials.gov ↗What the Registry Record Tells You About NCT07221669
The ClinicalTrials.gov registry entry for NCT07221669 describes a study currently listed as recruiting. It is categorized as Phase 3, which is the standard way researchers label where a study sits along the investigational pathway from early safety work through later efficacy and post-marketing evaluation. The registered enrollment target is 30 participants, a figure that helps gauge the scale of data the investigators plan to collect. The listed sponsor is Biogen, which has 74 total studies on file at ClinicalTrials.gov, and sponsors are the parties responsible for study design, oversight, and regulatory filings.
The record links to 1 condition, with Muscular Atrophy, Spinal appearing as the primary indexed condition, and to 1 intervention — of which Salanersen is the first listed. Interventions can include drugs, devices, procedures, behavioral programs, or observational arms, and each is tracked as a separate registry field so that downstream queries can filter accurately. When a trial lists multiple interventions, it usually reflects a multi-arm design or a comparison protocol rather than a single treatment being tested in isolation. The brief summary published in the registry is the clearest source of protocol intent and should be read before drawing conclusions from any sidebar tags.
Geographic footprint matters for practical reasons: NCT07221669 reports 2 study locations spanning 2 distinct geographic areas — top geographies include Texas, Virginia. A larger site network tends to correlate with broader recruitment capacity, but it does not imply anything about study quality, and site-level enrollment status can diverge from the overall registry status shown above. Every data point on this page comes from the public ClinicalTrials.gov dataset and is reproduced here for reference only; it is not a medical recommendation, an endorsement of the sponsor, or an invitation to enroll. Verify current status, eligibility criteria, and contact details directly at ClinicalTrials.gov, and discuss any participation decision with your own healthcare provider.
Frequently Asked Questions
What is clinical trial NCT07221669 about?
NCT07221669 is a clinical study titled "A Study to Learn About Salanersen's (BIIB115) Effects on Movement and Its Safety When Given Before Symptoms Appear in Babies With Genetically Diagnosed Spinal Muscular Atrophy (SMA)". In this study, researchers will learn more about the effects and safety of BIIB115, also known as salanersen. Specifically, researchers will learn more about how salanersen works in babies who have been diagnosed with SMA through genetic testing but have not yet started showing signs or symptoms. M...
What is the current status of trial NCT07221669?
This trial is currently recruiting. It is a Phase 3 study. The enrollment target is 30 participants. The study started on 2026-01-30. Estimated completion is 2032-05-29.
What conditions does trial NCT07221669 study?
This clinical trial studies the following conditions: Muscular Atrophy, Spinal. These conditions were identified from the trial registry and reflect the primary focus areas of the research.
What interventions are being tested in trial NCT07221669?
The interventions under investigation include: Salanersen (DRUG). Each intervention is being evaluated for safety and efficacy as part of this clinical study.
Who is sponsoring clinical trial NCT07221669?
This trial is sponsored by Biogen, which has 74 total clinical trials registered on ClinicalTrials.gov. The sponsor is responsible for the study's design, funding, and regulatory compliance.
Where is trial NCT07221669 being conducted?
This trial has 2 study locations across Texas, Virginia. Contact the study sites directly through ClinicalTrials.gov for enrollment availability.
Learn More About Clinical Trials
How Clinical Trials Work
Understand phases 1-4, trial design, randomization, and the informed consent process.
Patient Rights in Clinical Trials
Your rights as a participant: consent, withdrawal, privacy, and who to contact.
Finding the Right Clinical Trial
A practical guide to searching trials, understanding eligibility, and evaluating options.
All Guides
Browse our complete library of clinical trial educational resources.
Read our methodology — how this data is sourced, computed, and verified.