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Novartis shares drop 10% after del-desiran fails Phase 3 trial for myotonic dystrophy

Market News
08 Sep 2026
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Bearish
Novartis shares drop 10% after del-desiran fails Phase 3 trial for myotonic dystrophy

Novartis shares fell up to 10% after its drug del-desiran failed to meet the primary endpoint in the Phase 3 HARBOR study for myotonic dystrophy type 1, showing no significant improvement over placebo. This setback follows another recent late-stage trial failure by Novartis with its cardiovascular drug pelacarsen. The company is reviewing the full trial data and will consult health authorities to decide the next steps for del-desiran. The failure also negatively impacted shares of other companies developing treatments for the same condition, such as Dyne Therapeutics and Sarepta Therapeutics.

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