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BIIB800

Phase 1

Healthy Volunteer | Small molecule | Other |Biogen Inc.|Last Updated: Oct 6, 2025

Success Probability
Approval Probability 71%
TA Base Rate26%
Adjusted LOA41%
ML RiskLOW_RISK
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Market & Valuation
rNPV $3.2B
Market Size $9.4B
Revenue Basis $1.6B
Competitors 6
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Trial Design
RandomizedDouble-BlindCONTROLLEDBiomarker
Total Trials1
Total Enrollment300
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT06262477A Study to Evaluate the Pharmacokinetics, Safety and Immunogenicity of BIIB800 Subcutaneously (SC) Compared to Actemra® in Healthy Male ParticipantsPHASE1 COMPLETED 300Jan 2, 2024Oct 4, 2024Oct 6, 20254 United States, United Kingdom
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Study Endpoints
Primary Endpoints
Maximum Observed Serum Concentration (Cmax) of Tocilizumab
Pre-dose on Day 1 and multiple time points post-dose (up to Day 57)
Area Under the Concentration-Time Curve From Time Zero to Infinity (AUC0-inf) of Tocilizumab
Pre-dose on Day 1 and multiple time points post-dose (up to Day 57)
Area Under the Concentration-Time Curve up to the Last Measurable Concentration (AUC0-t) of Tocilizumab
Pre-dose on Day 1 and multiple time points post-dose (up to Day 57)
Secondary Endpoints
Time to Reach Cmax (Tmax) of BIIB800 and Tocilizumab
Pre-dose on Day 1 and multiple time points post-dose (up to Day 57)
Apparent Total Body Clearance (CL/F) of BIIB800 and Actemra
Pre-dose on Day 1 and multiple time points post-dose (up to Day 57)
Apparent Terminal Half-Life (t1/2) of BIIB800 and Actemra
Pre-dose on Day 1 and multiple time points post-dose (up to Day 57)
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Study Design & Arms
AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
BIIB800EXPERIMENTALParticipants will receive a single dose of BIIB800 via autoinjector, administered SC in the outer area of the upper arm on Day 1 of the study.
ActemraEXPERIMENTALParticipants will receive a single dose of Actemra via autoinjector, administered SC in the outer area of the upper arm on Day 1 of the study.
Interventions
NameTypeDescription
BIIB800DRUGAdministered as specified in the treatment arm.
ActemraDRUGAdministered as specified in the treatment arm.
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Eligibility Criteria
Age Range18 Years — 55 Years
SexMALE
Healthy VolunteersYes
Study Sites4

Key Inclusion Criteria: * Have a body mass index between 18.5 and 29.9 kilograms per meter square (kg/m\^2), inclusive. * Total body weight between 60.0 and 90.0 kg, inclusive. * Systolic blood pressure \<135 millimeters of mercury (mmHg) or \>85 mmHg at Screening, after being supine for at least 5...

Countries:United StatesUnited Kingdom
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