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RLYB116

Phase 1

Hematologic Diseases | Small molecule | Immunology |Rallybio Corporation|Last Updated: Feb 27, 2026

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-BlindPLACEBO_CONTROLLEDDMCBiomarker
Total Trials1
Total Enrollment16
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT06797375Safety, Tolerability, Pharmacokinetics and Pharmacodynamics Study of RLYB116 in Healthy ParticipantsPHASE1 COMPLETED 16Apr 14, 2025Feb 23, 2026Feb 27, 20261 Australia
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Study Endpoints
Primary Endpoints
Number of participants with treatment related adverse events as defined by CTCAE 5.0.
From baseline to Day 1, 2, 3, 4, 5, 8, 9, 15, 16, 22, 23, 29, 30, 32, 33, 36, 43, 57, 71, 99
Secondary Endpoints
Inhibition of complement activation measured by free/total C5 concentrations and hemolytic activity
Day 1, 2, 8, 15, 29, 20, 32, 33, 43, 57, 71, 99
Anti-RLYB116 antibodies measured in serum
Day 1, 29, 99
Exposure to RLYB116 as measured in serum
Day 1, 2, 3, 4, 5, 8, 15, 29, 53, 57, 71, 99
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Study Design & Arms
AllocationRANDOMIZED
MaskingDOUBLE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
RLYB116 Dose 1EXPERIMENTALRLYB116 for Injection Dose 1, weekly for 5 weeks
RLYB116 Dose 2EXPERIMENTALRLYB116 for Injection Dose 2, weekly for 5 weeks
Placebo for InjectionPLACEBO_COMPARATORSodium chloride injection, 0.9% saline (for both RLYB116 doses), weekly for 5 weeks
Interventions
NameTypeDescription
RLYB116 for InjectionDRUGRLYB116 is a small protein composed of an Affibody® Z-domain that binds with high affinity to C5, inhibiting terminal complement activation, and an albumin binding domain (ABD) that extends the effective plasma half-life of the protein by targeting serum albumin.
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Eligibility Criteria
Age Range18 Years — 55 Years
SexALL
Healthy VolunteersYes
Study Sites1

Inclusion Criteria: 1. Male and female participants, 18 to 55 years of age. 2. Able to provide written informed consent. 3. Body mass index (BMI) of 18.0 to 32.0 kg/m2. 4. Must have been vaccinated against N. meningitidis and S. pneumoniae with approved vaccine according to product label. All parti...

Countries:Australia
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Recent Changes (Last 90 Days)
MEDIUMApr 8, 2026NCT06797375TRIAL_REMOVED: changed
MEDIUMApr 8, 2026NCT06797375TRIAL_REMOVED: changed