Lilly’s Retatrutide Achieves 28.7% Weight Loss in Phase 3 Obesity-Osteoarthritis Trial

Lilly's Retatrutide Achieves 28.7% Weight Loss in Phase 3 Obesity-Osteoarthritis Trial

Eli Lilly & Co. (NYSE: LLY) announced positive topline results from the Phase 3 TRIUMPH‑4 trial evaluating retatrutide in adults with obesity/overweight and knee osteoarthritis, without diabetes. Both doses (9 mg and 12 mg) met all primary and key secondary endpoints at 68 weeks, delivering up to 28.7% average weight loss (71.2 lbs) and up to 4.5‑point reduction in WOMAC pain scores (75.8%).

Key Efficacy Results

EndpointRetatrutide 9 mgRetatrutide 12 mgBaseline Characteristics
Weight LossUp to 28.7% (71.2 lbs) averageUp to 28.7% (71.2 lbs) average84.0% had BMI ≥35 kg/m²
WOMAC Pain Score ReductionUp to 4.5 points (75.8%)Up to 4.5 points (75.8%)Co‑primary endpoint met
Cardiovascular Risk Markers↓ non‑HDL cholesterol, triglycerides, hsCRP↓ non‑HDL cholesterol, triglycerides, hsCRPSecondary endpoint achieved
Treatment Duration68 weeks68 weeksEfficacy and regimen estimands

Drug Profile

AttributeRetatrutide
MechanismOnce‑weekly triple GIP/GLP‑1/glucagon receptor agonist
DosingSubcutaneous injection (9 mg and 12 mg doses studied)
IndicationObesity/overweight with knee osteoarthritis (non‑diabetic)
Regulatory StatusPhase 3 TRIUMPH‑4 completed; submission planned by end‑2025
Broader PipelinePhase 3 trials ongoing in T2D, OSA, chronic back pain, MASLD, CV/renal outcomes

Market Opportunity

MetricValueImplication
Global Obesity Market$35 billion (2025)Projected $60 billion by 2030
Osteoarthritis Comorbidity250 million adults globallyHigh unmet need for weight‑pain dual therapy
Retatrutide Peak Sales$15‑20 billion (global estimate)If approved across multiple indications
Competitive PositionTriple agonist vs. GLP‑1 mono/dual agentsPotential best‑in‑class efficacy

Forward‑Looking Statements
This brief contains forward‑looking statements regarding retatrutide’s regulatory submission timeline, market projections, and broader development program. Actual results may differ due to regulatory delays, competitive responses, or safety profile changes.-Fineline Info & Tech