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RHH646

Phase 2

Osteoarthritis, Knee | Small molecule | Musculoskeletal |Novartis AG|Last Updated: Mar 31, 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_CONTROLLEDBiomarker
Total Trials1
Total Enrollment82
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT05816395Safety and Efficacy of RHH646 for Knee OsteoarthritisPHASE2 COMPLETED 82May 31, 2023Feb 24, 2025Mar 31, 202610 United States, Argentina +3
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Study Endpoints
Primary Endpoints
Change From Baseline in Cartilage Volume in the Index Region of the Target Knee by MRI
Baseline, Week 52

Magnetic resonance images (MRI) were obtained from the target knee to visualize and quantify changes in the volume of cartilage in the index region. The index region was defined as the combination of the femoral medial anterior (FMA), central (FMC) and posterior (FMP) cartilage subregions in the knee.

Number of Participants With Treatment Emergent Adverse Events (AEs) and Serious Adverse Events (SAEs)
Adverse events were reported from first dose of study treatment until end of study treatment plus follow up period, up to a maximum duration of approximately 56 weeks.

Number of participants with treatment emergent adverse events (any AE regardless of seriousness), and SAEs.

Secondary Endpoints
Pharmacokinetic (PK) Parameter: RHH646 Plasma Concentrations
Baseline (4 hours post dose), Week 4 (pre dose)
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Study Design & Arms
AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
RHH646 75 mgEXPERIMENTALRHH646 was administered orally once per day for a year.
PlaceboPLACEBO_COMPARATORMatching Placebo was administered orally once per day for a year.
Interventions
NameTypeDescription
RHH646DRUGRHH646 capsule for oral use
PlaceboDRUGRHH646 placebo capsule for oral use
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Eligibility Criteria
Age Range35 Years — 75 Years
SexALL
Healthy VolunteersNo
Study Sites10

Inclusion Criteria: * Participant is ≥35 and ≤75 years old, at time of screening * Participants must weigh at least 50 kg to participate in the study and must have a body mass index (BMI) ≤35 kg/m2. BMI = Body weight (kg) / \[Height (m)\]2 * Diagnosis of tibiofemoral OA in at least one knee by stan...

Countries:United StatesArgentinaDenmarkPolandSpain
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