Recent Updates
Recently added Catalysts

BIIB017

Phase 4FDA approved 2014

Multiple Sclerosis, Relapsing-Remitting | Small molecule | Neurology |Biogen Inc.|Trials Updated: Sep 24, 2026

BIIB017 development status

FDA approval Aug 15, 2014 as Plegridy
Approval holderBiogen Idec Inc
ApplicationBLA125499
Highest phase Phase 4 (NCT03424733)
Phase scored for BIIBPhase 3
Registered trials 3 across 3 sponsors since Sep 2013

Label indication PLEGRIDY is indicated for the treatment of relapsing forms of multiple sclerosis (MS), to include clinically isolated syndrome, relapsing-remitting disease, and active secondary progressive disease, in adults. PLEGRIDY is an interferon beta indicated for the treatment of relapsing forms of multiple sclerosis (MS), to include clinically isolated syndrome, relapsing-remitting disease, and active secondary progressive… FDA label

BIIB017 target and mechanism

ModalitySmall molecule

Also known as BIIB017 (peginterferon beta-1a), BIIB017 (PEGylated Interferon Beta-1a), Plegridy, peginterferon beta-1a, PEGylated interferon beta-1a, PEG IFN β-1a, BIIB017 (peginterferon beta-1a) Pre-filled syringe (PFS), BIIB017 (peginterferon beta-1a) Autoinjector

Success Probability

Subscribe to view

Market & Valuation

Subscribe to view

Trial Design

RandomizedACTIVE_CONTROLLEDDMC
Total Trials3
Total Enrollment1,919

FDA Designations

No designations recorded

BIIB017 clinical trials

BIIB017 · 3 trials · 2 indications

Phase 3 3
NCT03958877A Study to Evaluate the Safety, Tolerability, and Efficacy of BIIB017 (Peginterferon Beta-1a) in Pediatric Participants for the Treatment of Relapsing-Remitting Multiple SclerosisMultiple Sclerosis, Relapsing-Remitting
ACTIVE NOT_RECRUITING152 Analytics
NCT01939002Characterize Flu-like Symptoms in Relapsing Multiple Sclerosis Patients Transitioning From Non-Pegylated Interferon Beta (IFN-β) Therapies to Peginterferon Beta-1a (BIIB017)Relapsing Multiple Sclerosis
COMPLETED251 Analytics
NCT00906399Efficacy and Safety Study of Peginterferon Beta-1a in Participants With Relapsing Multiple SclerosisRelapsing Multiple Sclerosis
COMPLETED1,516 Analytics
PHASE3ACTIVE NOT_RECRUITING
A Study to Evaluate the Safety, Tolerability, and Efficacy of BIIB017 (Peginterferon Beta-1a) in Pediatric Participants for the Treatment of Relapsing-Remitting Multiple Sclerosis
Multiple Sclerosis, Relapsing-RemittingUnlock trial analytics
PHASE3COMPLETED
Characterize Flu-like Symptoms in Relapsing Multiple Sclerosis Patients Transitioning From Non-Pegylated Interferon Beta (IFN-β) Therapies to Peginterferon Beta-1a (BIIB017)
Relapsing Multiple SclerosisUnlock trial analytics
PHASE3COMPLETED
Efficacy and Safety Study of Peginterferon Beta-1a in Participants With Relapsing Multiple Sclerosis
Relapsing Multiple SclerosisUnlock trial analytics

Study Endpoints

Primary Endpoints

Part 1: Annualized Relapse Rate (ARR) at Week 48
Week 48

A multiple sclerosis (MS) relapse is defined as the onset of new or recurrent neurologic symptoms not associated with fever or infection, lasting at least 24 hours, and accompanied by new objective neurological findings. ARR is calculated as the total number of relapses in each treatment group adjusted for the duration of study treatment in person-years.

Part 2: Percentage of Participants With Adverse Events (AEs), Serious Adverse Events (SAEs) and AEs Leading to Study Treatment Discontinuation
From Week 96 to Week 196

An AE is any untoward medical occurrence in a participant or clinical investigation participant administered a pharmaceutical product and that does not necessarily have a causal relationship with this treatment. An AE can therefore be any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease temporally associated with the use of a medicinal (investigational) product, whether or not related to the medicinal (investigational) product. An SAE is any untoward medical occurrence that at any dose results in death, is a life-threatening event, requires inpatient hospitalization or prolongation of existing hospitalization, results in a significant disability/incapacity or congenital anomaly, or is a medically important event.

Percentage of Participants Experiencing New or Increased FLS During the First 8 Weeks: Overall Population
during the first 8 weeks of treatment

The total Flu-like Symptoms Score (FLS-S) is the sum of all 4 symptom scores (muscle aches, chills, fatigue and fever), each rated from 0 (absent) to 3 (severe), with a range of 0-12 with 0 indicating no FLS and 12 indicating severe FLS. New or increased FLS is defined as an FLS overall score of 2 points or greater over Screening. Pre-dose data were not used; up to 48-hour data after dosing were used. Overall score was imputed as the average score after dose.

Annualized Relapse Rate (ARR) at 1 Year
1 Year

A relapse is defined as new or recurrent neurologic symptoms not associated with fever or infection, lasting for at least 24 hours, and accompanied by new objective neurologic findings. Only relapses confirmed by an independent neurology evaluation committee (INEC) are included in the analysis. Data after participants switched to alternative multiple sclerosis (MS) medications are excluded. Data were analyzed using negative binomial regression, adjusted for baseline Expanded Disability Status Scale (EDSS) score (\< 4 versus ≥ 4), baseline age (\< 40 versus ≥ 40 years), and baseline relapse rate (number of relapses in 3 years prior to study entry divided by 3).

Secondary Endpoints

Part 1: ARR at Week 96
Week 96
Part 1: Percentage of Participants Free of New or Newly Enlarging T2 Hyperintense Lesions on Brain Magnetic Resonance Imaging (MRI) Scans at Weeks 24, 48, and 96
Weeks 24, 48, and 96
Part 1: Percentage of Participants Free of New MRI Activity in the Brain (Free of Gadolinium [Gd]-Enhancing Lesions and New or Newly Enlarging T2 Hyperintense Lesions) at Weeks 24, 48, and 96
Weeks 24, 48, and 96
Unlock Study Endpoints

Study Design & Arms

AllocationRANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
BIIB017 (peginterferon beta-1a)EXPERIMENTALParticipants will receive subcutaneous (SC) injection of BIIB017 (peginterferon beta-1a) 63 microgram (μg) on Day 1, followed by 94 μg at Week 2, followed by 125 μg at Week 4, and then 125 μg SC injection every 2 weeks up to Week 96 in Part 1 of the study. Eligible participants who enter optional Part 2 of the study will receive 125 μg SC injections of BIIB017 every 2 weeks for 96 Weeks.
AvonexACTIVE_COMPARATORParticipants will receive Avonex (interferon beta type 1a) starting at a dose of 7.5 μg on Day 1, followed by an increase of 7.5 μg each week for 3 weeks, followed by 30 μg intramuscular (IM) injections every week up to Week 96 in Part 1 of the study. Eligible participants who enter optional Part 2 of the study will receive 125 μg SC injections of BIIB017 every 2 weeks for 96 Weeks.
BIIB017 plus current FLS therapyEXPERIMENTALFollowing a 4-week run-in period (starting 1 day after the Screening Visit) in which participants administer non-pegylated IFN therapy, participants receive BIIB017 at an initial dose of 63 μg followed by 94 μg dose at Week 2 and 125 μg every 2 weeks from Week 4 to Week 46, plus current FLS management regimen as determined by the clinician.
BIIB017 plus naproxenEXPERIMENTALFollowing a 4-week run-in period (starting 1 day after the Screening Visit) in which participants administer non-pegylated IFN therapy, participants receive BIIB017 at an initial dose of 63 μg followed by 94 μg dose at Week 2 and 125 μg every 2 weeks from Week 4 to Week 46, plus 500 mg naproxen administered twice daily up to 24 hours prior to BIIB017 treatment and continuing for 48 hours following the BIIB017 injection for the first 8 weeks of treatment, and as recommended by the treating physician subsequently.
PlaceboPLACEBO_COMPARATORPlacebo every 2 weeks for 48 weeks followed by 125 µg peginterferon beta-1a subcutaneously every 2 or 4 weeks for 48 weeks.
Peginterferon Beta-1a Q2WEXPERIMENTAL125 µg peginterferon beta-1a subcutaneously every 2 weeks (Q2W) for 96 weeks.
Peginterferon Beta-1a Q4WEXPERIMENTAL125 µg peginterferon beta-1a subcutaneously every 4 weeks (Q4W) for 96 weeks. Participants received a placebo injection 2 weeks after each active injection (in order to maintain the blind with Q2W arm).

Interventions

NameTypeDescription
BIIB017 (peginterferon beta-1a)DRUGAdministered as specified in the treatment arm
Interferon beta type 1aDRUGAdministered as specified in the treatment arm
BIIB017DRUG -
naproxenDRUG -
PlaceboDRUGMatched placebo provided in pre-filled syringes, to deliver 0.5 mL self-administered by subcutaneous injection.
Unlock Study Design Details

Eligibility Criteria

Age Range10 Years to 18 Years
SexALL
Healthy VolunteersNo
Study Sites65

Key Inclusion Criteria: Part 1: * Must have a diagnosis of RRMS as defined by the revised consensus definition for pediatric MS. * Must have an EDSS score between 0.0 and 5.5. * Must have experienced \>= 1 relapse in the 12 months prior to randomization (Day 1) or \>= 2 relapses in the 24 months p...

Countries:United StatesArgentinaAustraliaBelgiumBulgariaCroatiaCzechiaFranceGermanyGreeceHungaryIsraelItalyKuwaitPortugalRussiaSaudi ArabiaSerbiaSlovakiaSpainTunisiaTurkey (Türkiye)CanadaChileColombiaEstoniaGeorgiaIndiaLatviaMexicoNetherlandsNew ZealandPeruPolandRomaniaUkraineUnited Kingdom
Unlock Eligibility Criteria

Recent Changes (Last 90 Days)

LOWSep 24, 2026NCT03958877lastUpdatePostDate: changed
LOWSep 24, 2026NCT03958877lastUpdatePostDate: changed

Frequently asked questions about BIIB017

What is BIIB017 used for?

BIIB017 is being developed for the treatment of relapsing forms of multiple sclerosis, including relapsing-remitting multiple sclerosis and relapsing multiple sclerosis. It is an investigational therapy studied in both adult and pediatric patients with these conditions.

Who is developing BIIB017?

BIIB017 is being developed by Biogen Inc., which trades on the Nasdaq under the ticker symbol BIIB. Biogen is the sponsor of the clinical trials evaluating BIIB017 in multiple sclerosis.

What phase is BIIB017 in?

BIIB017 is in Phase 3 clinical development. It has been evaluated in Phase 3 trials, including a completed study in adults with relapsing multiple sclerosis and an ongoing Phase 3 study in pediatric patients with relapsing-remitting multiple sclerosis.

What clinical trials is BIIB017 in?

BIIB017 has been studied in Phase 3 trials including NCT00906399, a completed efficacy and safety study in adults with relapsing multiple sclerosis, NCT01939002, a completed study of flu-like symptoms in patients transitioning from non-pegylated interferon beta therapies, and NCT03958877, an active Phase 3 trial in pediatric patients with relapsing-remitting multiple sclerosis.

Is BIIB017 the same as peginterferon beta-1a?

Yes, BIIB017 is also known as peginterferon beta-1a or PEGylated interferon beta-1a. These names refer to the same investigational drug candidate being developed by Biogen for relapsing forms of multiple sclerosis.