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Biogen and Denali halt BIIB122 development after Phase 2b Parkinson's study fails to meet endpoints

Company Fundamentals
21 May 2026
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Bearish
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Biogen and Denali announced that their Phase 2b LUMA study of BIIB122 (DNL151) in early-stage Parkinson's disease did not meet its primary or secondary endpoints, showing no slowing of disease progression compared to placebo. Despite good safety and biomarker results, the companies will discontinue BIIB122 development for idiopathic Parkinson's disease. Denali will continue a separate Phase 2a BEACON study targeting Parkinson's patients with a specific LRRK2 genetic variant, with results expected in early 2027. This decision highlights the challenges in developing effective Parkinson's treatments and the ongoing research into LRRK2 as a therapeutic target.

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Biogen names Michael J. Parini as new Chief Legal Officer starting August 3, 2026

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