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BIIB122

Phase 3

Parkinson Disease | Small molecule | Neurology |Biogen Inc.|Trials Updated: Jun 4, 2026

BIIB122 development status

Highest phase Phase 3 (NCT05418673)
Phase scored for BIIBPhase 2
Registered trials 6 across 2 sponsors since Aug 2019

BIIB122 target and mechanism

Molecular targetLRRK2
Target classGene
ModalitySmall molecule

Also known as BIIB122 (DNL151), [14C] BIIB122 ([14C] DNL151), DNL151

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLEDDMC
Total Trials2
Total Enrollment686

FDA Designations

No designations recorded

BIIB122 clinical trials

BIIB122 · 2 trials · 2 indications

Phase 2 1Phase 1 1
NCT05348785A Study to Learn About the Safety of BIIB122 Tablets and Whether They Can Slow the Worsening of Early-Stage Parkinson's Disease in Adults Between the Ages of 30 and 80Parkinson Disease
COMPLETED650 Analytics
PHASE2COMPLETED
A Study to Learn About the Safety of BIIB122 Tablets and Whether They Can Slow the Worsening of Early-Stage Parkinson's Disease in Adults Between the Ages of 30 and 80
Parkinson DiseaseUnlock trial analytics

Study Endpoints

Primary Endpoints

Time to Confirmed Worsening in Movement Disorder Society Unified Parkinson's Disease Rating Scale (MDS-UPDRS) Parts II and III Combined Score Over the Treatment Period
Up to Week 144

Time to confirmed worsening is defined as a worsening event sustained over 2 consecutive assessments. MDS-UPDRS is a multimodal scale assessing impairment and disability consisting of 4 parts. Part II assesses motor experiences of daily living (Range 0-52). It contains 13 questions which are to be completed by the participant. Part III assesses the motor signs of PD and is administered by the rater (Range 0-132). Part III contains 33 scores based on 18 items. For each question a numeric score is assigned between 0-4, where 0 = Normal, 1 = Slight, 2 = Mild, 3 = Moderate, 4 = Severe. MDS-UPDRS Part II and III combined score equals the sum of Parts II and III (Range 0-184). A higher score indicates more severe symptoms of PD.

Number of Subjects with Treatment-Emergent Adverse Events (AEs) and Serious Adverse Events (SAEs)
Randomization to Day 42
Number of Subjects with laboratory test abnormalities
Randomization to Day 42
Number of Subjects with vital sign abnormalities
Randomization to Day 42
Number of Subjects with electrocardiogram (ECG) abnormalities
Randomization to Day 42
Number of Subjects with clinically significant neurological examination abnormalities
Randomization to Day 42

Secondary Endpoints

Number of Participants With Treatment Emergent Adverse Events (TEAEs) and Serious Adverse Events (SAEs)
Up to Week 144
Time to Confirmed Worsening in MDS-UPDRS Part II Score Over the Treatment Period
Up to a minimum of 48 weeks and a maximum of 144 weeks
Change From Baseline in MDS-UPDRS Parts II and III Combined Score
From Baseline up to Week 48
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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
BIIB122 225 mgEXPERIMENTALParticipants will receive BIIB122, 225 mg tablets, by mouth, once daily (QD) for up to a minimum of 48 weeks and a maximum of 144 weeks. Participants who received BIIB122 and completed the ET visit of study 283PD302 (NCT05418673) will continue to receive BIIB122, 225 mg tablets, by mouth, QD for up to a minimum of 48 weeks and a maximum of 144 weeks.
BIIB122 Matching PlaceboPLACEBO_COMPARATORParticipants will receive BIIB122 matching placebo tablets, by mouth, QD for up to a minimum of 48 weeks and a maximum of 144 weeks. Participants who received placebo and completed the ET visit of study 283PD302 (NCT05418673) will continue to receive BIIB122 matching placebo tablets, by mouth, QD for up to a minimum of 48 weeks and a maximum of 144 weeks.
DNL151 Low DoseEXPERIMENTAL -
DNL151 Mid DoseEXPERIMENTAL -
DNL151 High DoseEXPERIMENTAL -
PlaceboPLACEBO_COMPARATOR -

Interventions

NameTypeDescription
BIIB122DRUGAdministered as specified in the treatment arm
BIIB122-Matching PlaceboDRUGAdministered as specified in the treatment arm
DNL151DRUGOral repeating dose
PlaceboDRUGOral repeating dose
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Eligibility Criteria

Age Range30 Years to 80 Years
SexALL
Healthy VolunteersNo
Study Sites113

Key Inclusion Criteria: * Clinical diagnosis of PD meeting the Movement Disorder Society Clinical Diagnostic Criteria within 2 years of the Screening Visit, inclusive, and at least 30 years of age at the time of diagnosis * Modified Hoehn and Yahr scale stages 1 to 2 (in OFF state), inclusive, at s...

Countries:United StatesAustriaCanadaChinaFranceGermanyIsraelItalyJapanNetherlandsPolandSpainUnited KingdomBelgium
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Frequently asked questions about BIIB122

What is BIIB122 used for?

BIIB122 is an investigational small molecule being studied for the treatment of Parkinson disease. It is designed to slow the worsening of early-stage Parkinson disease in adults between the ages of 30 and 80. It is not approved for any indication and remains in clinical development.

What does BIIB122 target?

BIIB122 targets LRRK2, a gene that encodes leucine-rich repeat kinase 2. LRRK2 is a gene target, and the drug is a small molecule directed at it. Targeting LRRK2 is being explored as an approach to slow the worsening of early-stage Parkinson disease.

Who is developing BIIB122?

BIIB122 is being developed by Biogen Inc., which trades on the Nasdaq under the ticker BIIB. Biogen is the sponsor of the clinical program evaluating the drug in Parkinson disease.

What phase is BIIB122 in?

BIIB122 is in Phase 2 clinical development. It is an investigational drug and is not FDA approved. The Phase 2 study has been completed, and no trials are currently active.

What clinical trials is BIIB122 in?

BIIB122 has been studied in one Phase 2 trial, NCT05348785, titled a study to learn about the safety of BIIB122 tablets and whether they can slow the worsening of early-stage Parkinson disease in adults aged 30 to 80. The trial enrolled 650 participants, was randomized, double-blind, and placebo-controlled, and is completed.

Is BIIB122 the same as DNL151?

Yes. BIIB122 is also known as DNL151, and the carbon-14 labeled form is referred to as [14C] BIIB122 or [14C] DNL151. These names refer to the same investigational LRRK2-targeted small molecule being developed by Biogen for Parkinson disease.