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Biogen-Eisai LEQEMBI IQLIK approval; diranersen Phase 2 data raises questions

Jul 14, 2026, 12:11 PM EDT2 sourcesAI-analyzed

Why it may matterVerify against the original reporting

Immediate sell-off driven by questions about robustness and reproducibility of Phase 2 results, despite an FDA initiation-dose approval; history shows mixed readouts can cause short-term volatility even when approvals occur.

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What happened, with direct paths to the underlying reporting

Biogen and Eisai disclosed FDA approval for a weekly LEQEMBI IQLIK initiation regimen alongside Phase 2 diranersen data. While 18-month results show tau reductions and slowed decline across doses, the strongest effect occurred at 60 mg q6m, and questions about data robustness weighed on sentiment. The stock traded lower as investors weighed near-term risks against potential long-term Alzheimer's treatment opportunities.

Biogen shares fell ~9% after data release. RBC questioned robustness and reproducibility.
FDA approves weekly LEQEMBI IQLIK initiation for early Alzheimer's.
Phase 2 CELIA: diranersen shows 18-month efficacy; strongest at 60 mg q6m.
Tau reductions: CSF total tau down 50-65% across doses; tau PET reductions observed.
Autoinjector enables 500 mg weekly subcutaneous LEQEMBI initiation.

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