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Novartis Announces Trial Setback on Del-Desiran Drug

Novartis said the drug missed its primary endpoint, and shares fell as much as 10% in early Swiss trading.

  • On Tuesday, Novartis reported that an experimental drug failed a late-stage study, sending company shares down 10% in early trading.
  • The Phase III HARBOR study of the treatment, acquired in a $12 billion purchase of Avidity Biosciences, "did not demonstrate statistically significant improvement versus placebo" on its primary endpoint.
  • Novartis has missed two of three key pipeline readouts this year, including a drug readout James Eugene, an analyst at Verso Investment Management, described as a "must win."
  • Novartis maintained its sales guidance of 5% to 6% growth through 2030, even after shares fell more than 3% yesterday following another trial failure.
  • Shreeram Aradhye, Chief Medical Officer at Novartis, said developing therapies for DM1 remains challenging, noting that setbacks are part of scientific progress as the company navigates patent expiries for Entresto.
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Novartis faces fresh blow to pipeline with del-desiran drug setback

·London, United Kingdom
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Center

Novartis has suffered its second failure with an experimental drug in a week, after its drug del-desiran failed to show efficacy in a late-stage trial for myotonic dystrophy. Novartis shares fell 10 percent on the Swiss stock exchange this morning.

·Budapest, Hungary
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Neue Zürcher Zeitung broke the news in Zürich, Switzerland on Monday, September 7, 2026.
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