Argenx Stops Phase 3 Vyvgart Trial in Sjögren's Disease After Monitors Find the Study Cannot Meet Its Goal
Argenx halted its Phase 3 UNITY trial of efgartigimod for Sjögren's disease after monitors found it unlikely to meet its primary goal. The decision, announced Oct. 8, was based on an interim analysis showing futility, not safety concerns. The drug remains approved for other conditions. Argenx plans to analyze the data and share findings. According to William Blair analysts, the trial included over 500 of 630 enrolled patients.
How this was made

The 30-second read
Why it matters
The announcement removes a potential new market for Vyvgart, likely leading to a share price decline as investors adjust growth expectations.
Market read
Primary biotech news affecting ARX; limited broader market effect.
What to watch
Argenx still has approved indications and a positive Phase 2/3 myositis result that could offset the loss.
Background
Argenx (NASDAQ: ARX) halted its UNITY Phase 3 trial for Vyvgart Hytrulo in primary Sjögren's disease after an independent data monitoring committee deemed the study unlikely to meet its primary endpoint.
Market effects
Biotech sector may see modest caution on autoimmune pipeline bets.
Limited to US-listed biotech investors.
Minimal global impact beyond ARX.
Counterpoint
If the drug succeeds in other autoimmune indications, the setback may be priced out quickly.
Key entities
- companyArgenx
Biopharma developing Vyvgart Hytrulo for autoimmune diseases.
- drugVyvgart Hytrulo
Efgartigimod formulation under investigation for Sjögren's disease.


