Novartis' Phase III trial for del-desiran in treating DM1 failed to meet its primary endpoint, causing shares to drop 9%
Novartis' Phase III trial for del-desiran in treating DM1 failed to meet its primary endpoint, causing shares to drop 9%. The company will evaluate the data and consult regulators. This follows another late-stage trial failure for its heart drug, pelacarsen. Novartis acquired del-desiran through its $12B Avidity Biosciences purchase, with Barclays previously estimating peak sales at $3.1B. Despite the setback, Novartis reaffirmed its 2030 revenue growth targets.
How this was made

The 30-second read
Why it matters
The trial miss undermines confidence in the Avidity acquisition and may affect upcoming guidance.
Market read
Significant negative catalyst for a major pharma stock, with potential spillover to the sector.
What to watch
Potential positive data from del‑zota and other Avidity assets could offset the setback.
Background
Novartis recently acquired Avidity Biosciences, aiming to boost its pipeline; this failure raises questions about that strategy.
Ticker impact
Novartis' Phase III HARBOR trial for del‑desiran failed, causing a 9% intraday share drop.
downward pressure, potential further decline if no mitigating news.
Phase III failure for a major pipeline asset, combined with a double‑digit price drop, signals immediate downside risk.
Market effects
Biotech sector may see broader risk aversion on late‑stage trial failures.
European markets could be pressured by Novartis' decline.
Large‑cap pharma stocks may experience heightened volatility.
Counterpoint
If the company can pivot to other pipeline assets, the dip may be over‑reacted.
Key entities
- companyNovartis
Swiss pharmaceutical giant (ticker NVS).
- companyAvidity Biosciences
Biotech acquired by Novartis for $12 billion.




