Updated May 2026 · ClinicalTrials.gov
Biogen
6 clinical trials · 6 recruiting · INDUSTRY
Biogen has 6 clinical trials registered on ClinicalTrials.gov, with 6 actively recruiting participants. The trials listed below cover 5 conditions across the phases listed in the sidebar. Always discuss any specific trial with your physician before contacting a study site.
About Biogen\'s Trial Portfolio
Biogen is an industry sponsor — typically a pharmaceutical, biotechnology, or medical device company. Industry sponsors fund and run the largest share of registered trials in the United States and are subject to FDA registration requirements under the FDA Amendments Act (FDAAA 801) for most drug and device studies.
6 of Biogen's 6 registered trials are currently recruiting — roughly 100% of the portfolio. A high recruiting share usually points to an active research pipeline with multiple programs at the enrollment stage.
Biogen's research footprint spans Muscular Atrophy, Spinal (3 trials), Amyotrophic Lateral Sclerosis (1), and subacute-cutaneous-lupus-erythematosus (1) as the top three conditions. The full condition list, sorted by trial count, is in the sidebar.
is the largest single phase in Biogen's portfolio at 33% of registered trials. The full phase breakdown appears in the sidebar.
Trials by Biogen
A Study to Learn More About the Long-Term Safety of Tofersen (Qalsody) in Participants With Superoxide Dismutase 1...
In this study, researchers will learn more about the safety of tofersen, also known as Qalsody®. This is a drug available for doctors to prescribe for participant with a certain...
A 2-Part Study to Learn Whether Litifilimab (BIIB059) Injections Can Improve Symptoms of Adult Participants Who Have...
In this study, researchers will learn more about a study drug called litifilimab (BIIB059) in participants with cutaneous lupus erythematosus (CLE). The study will focus on...
A Study to Learn How Nusinersen (Spinraza) Affects Participants With Spinal Muscular Atrophy (SMA) Who Took it Before...
In this study, researchers will know more about the effects of nusinersen, also known as Spinraza®, in pregnant participants with spinal muscular atrophy, also known as SMA. This...
A Study to Learn About Salanersen's (BIIB115) Effects on Movement and Its Safety in Participants Aged 15 to 60 Years...
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...
A Study to Find Out How Nusinersen is Processed in the Body When Given Through the ThecaFlex DRx™ System in Adult and...
In this PIERRE-PK study, researchers will learn how the body processes nusinersen when it is given through the ThecaFlex DRx™ System, compared to when nusinersen is given by...
A Study to Learn About Salanersen's (BIIB115) Effects on Movement and Its Safety When Given Before Symptoms Appear in...
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...
How to Approach a Trial Listing
Each trial card above links to a dedicated page with the official ClinicalTrials.gov data plus a plain-English translation of the eligibility criteria. We translate technical terminology (ECOG performance status, hepatic function values, exclusionary lab thresholds) into language that a patient or caregiver can understand, but the original clinical text and the live ClinicalTrials.gov record always govern any actual eligibility decision.
Before contacting a trial site, write down questions for your treating physician using the framework on our 25 Questions guide. Discuss whether the trial fits your treatment plan, what the time commitment looks like, and whether your insurance will cover the standard-of-care portions. Trials are not a substitute for a treatment plan — they are an addition that needs medical guidance to evaluate.
Authoritative Resources
Verify any trial registration directly on ClinicalTrials.gov. For background on the FDA approval pathway that Phase 3 trials feed into, see the FDA drug approval process. For cancer-specific trial guidance, the National Cancer Institute publishes patient-oriented overviews. For global trial registrations beyond the U.S., the WHO ICTRP aggregates registries from around the world.
Frequently Asked Questions
How many clinical trials does Biogen have on ClinicalTrials.gov?
Biogen has 6 clinical trials registered on the federal ClinicalTrials.gov registry, of which 6 are actively recruiting participants right now. These counts come directly from the ClinicalTrials.gov API and are updated as the registry changes.
What conditions does Biogen study?
Biogen's registered trials cover 5 conditions on ClinicalTrials.gov, led by Muscular Atrophy, Spinal (3 trials), Amyotrophic Lateral Sclerosis (1 trial), subacute-cutaneous-lupus-erythematosus (1 trial), chronic-cutaneous-lupus-erythematosus (1 trial), Spinal Muscular Atrophy (1 trial). The complete condition list appears in the sidebar of this page; each condition links to a page listing every recruiting trial in that area, regardless of sponsor.
How do I join a Biogen clinical trial?
Joining a clinical trial is a medical decision that should always involve your treating physician. Each trial page on this site includes the eligibility criteria translated into plain English alongside the official clinical text, plus the contact information that the sponsor has registered with ClinicalTrials.gov. Bring the trial information to your doctor before reaching out — they can review the full inclusion and exclusion criteria against your medical history and help you decide whether to pursue screening.
What does the trial phase mean?
Phase 1 trials test safety and dosing in small groups (often 20–80 healthy volunteers or patients). Phase 2 trials evaluate efficacy and side effects in larger groups (100–300 patients with the target condition). Phase 3 trials confirm efficacy and monitor safety in the largest groups (300–3,000+ patients) and form the basis of an FDA approval submission. Phase 4 studies happen after a treatment is approved, monitoring long-term safety and effectiveness in real-world use. Some trials register without a phase — common for device, behavioral, or observational studies.
Where does this trial data come from?
All trial data is pulled directly from the ClinicalTrials.gov API v2, the official federal trial registry maintained by the National Library of Medicine at NIH. Under FDAAA 801, most U.S. drug and device trials are required to register, making ClinicalTrials.gov the most comprehensive source. Sponsors are responsible for keeping their listings current; trial status can shift between data refreshes.
How This Sponsor Page Is Built
Every count on this page is derived directly from ClinicalTrials.gov API v2 records. Trial counts include all trials currently registered to this sponsor; the recruiting count reflects trials with status "Recruiting" or equivalent. Plain-English eligibility translations on each linked trial page preserve the original clinical text alongside an accessible version. Read the full methodology for the data pipeline and limitations.
Source: ClinicalTrials.gov API v2, maintained by the National Library of Medicine at NIH. Public domain. Cite as: "TrialFinderData. Data: ClinicalTrials.gov."
Medical disclaimer: This page is informational, not medical advice. Talk to your doctor about whether a clinical trial is right for you.
Last updated 2026-05-08 · 6 trials tracked for Biogen.
For this entity, the underlying data on this page comes from the NIH ClinicalTrials.gov registry. The breakdown above is the federal record; the paragraphs below add the per-entity context that makes the headline numbers usable for a real decision rather than just a data lookup.
The methodology behind every numeric value on this page is publicly documented on the the NIH ClinicalTrials.gov registry portal and described in detail on this site’s methodology page. Refresh cadence varies by underlying series; the page surfaces the as-of date for each number so readers can trace any figure back to the source release.
For readers using this page as a decision input, the related-entity pages elsewhere on the site provide the comparison set. The most useful comparison for this entity is typically a peer within active and historical clinical trials with similar size, similar exposure, or similar geography — not the national-level summary alone.