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Alnylam Says Phase 1b Brezosiran Study Showed Dose-Dependent CSF Mutant Huntingtin Reductions, Up To 83% Individually, No Dose-Dependent Safety Signals; Pivotal Study Planned 2027 Pending Regulatory Alignment

Oct 23, 2026 · 03:46 AM ET· updated 1h ago

- Initial Phase 1b results show mean reduction of cerebrospinal fluid mutant huntingtin of 60 to 64% at month 3 with individual reduction of up to 83% and encouraging safety and tolerability with potential for twice

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Why It Matters

Alnylam's medicine reduced a harmful protein in Huntington's patients by up to 83%. This early result looks safe and promising, which is why they plan bigger tests next.

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Source: Benzinga · Read the original report at the publisher. Headline and figures shown for context; data may be delayed.

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