Biogen FY Conference Summary Company Overview - **Company**: Biogen (NasdaqGS:BIIB) - **Date of Conference**: September 24, 2025 Key Points Alzheimer's Disease and LEQEMBI - Biogen is experiencing positive momentum with the launch of LEQEMBI, particularly following the approval for subcutaneous maintenance therapy, which offers patients the option to self-administer at home [2][10] - The company is also pursuing a rolling submission for subcutaneous initiation therapy, expected to provide patients with more treatment options [2][10] - The approval of blood-based biomarkers by the FDA is seen as a significant advancement, increasing testing and potentially improving patient outcomes [3] Revenue Growth and R&D Focus - Year-on-year revenue growth from new products is offsetting declines from multiple sclerosis (MS) products, indicating a strategic shift towards growth products [4] - Biogen is focusing on high-value, high-probability success programs in its R&D pipeline, with several late-stage programs expected to yield registrational data soon [4][5] Pipeline Developments - Biogen is advancing several programs into Phase 3 trials, including treatments for lupus and rare nephrology conditions [5][6] - The company is also exploring new modalities and collaborations, such as with Stoke Therapeutics for Dravet syndrome [6][7] TAU ASO and CELIA Study - The TAU ASO (BIIB080) is in Phase 2 trials, with hopes to demonstrate significant reductions in TAU levels and clinical benefits [11][12] - The CELIA study aims to evaluate the impact of reducing all TAU isoforms on biomarkers and clinical outcomes [12] GLP-1 and Alzheimer's - Biogen acknowledges the potential of GLP-1 therapies in addressing neuroinflammatory pathways in Alzheimer's, despite mixed results from other trials [15] AHEAD Trials - The AHEAD 3 and AHEAD 4, 5 trials are designed to address pre-symptomatic stages of Alzheimer's, focusing on preventing further amyloid accumulation and cognitive decline [17][18] SMA and SPINRAZA - Biogen continues to focus on spinal muscular atrophy (SMA) with SPINRAZA, which remains a critical therapy despite competition from gene therapies [22][23] - The company is pursuing a high-dose version of SPINRAZA and a new antisense oligonucleotide, Salinursin, with promising early data [24][25] Lupus Opportunities - Lupus is identified as a significant market opportunity, with only two biologics currently available and a high unmet need [27][28] - Biogen is advancing Dapirolizumab pegol and litifilimab through multiple Phase 3 trials, targeting different lupus manifestations [29][30] Felsardimab and Rare Kidney Indications - Felsardimab is being explored for several rare kidney conditions, with ongoing Phase 3 trials and a focus on addressing unmet needs in these areas [39][40] - The company is optimistic about the potential of Felsardimab in conditions like AMR and IgAN, despite a crowded competitive landscape [41][42] IRAK4 Program - The IRAK4 program is in early development stages, with plans for a Phase 2 program to explore its potential in various inflammatory conditions [48] Overall R&D Strategy - Biogen's R&D strategy emphasizes a diversified pipeline with multiple high-value programs, aiming for significant market impact across various therapeutic areas [50] - The company is committed to innovation and disciplined cost management while expanding its portfolio through both internal and external collaborations [50] Conclusion - Biogen is positioned for growth with a robust pipeline across neurology, immunology, and rare diseases, focusing on high unmet needs and innovative therapies [50]

Core Insights - Biogen Inc. will present significant data at the 2025 Alzheimer's Association International Conference (AAIC) regarding LEQEMBI (lecanemab) and BIIB080, focusing on long-term results and new treatment formulations [1][2][6] Group 1: LEQEMBI (lecanemab) Developments - The upcoming presentations will include 48-month results from the Clarity AD open-label extension, real-world evidence, and insights into a subcutaneous formulation for maintenance dosing of LEQEMBI [1][2][6] - LEQEMBI is a humanized IgG1 monoclonal antibody targeting amyloid-beta, which received traditional FDA approval on July 6, 2023, for treating Alzheimer's disease [8][9] Group 2: BIIB080 Investigational Therapy - BIIB080 is an investigational antisense oligonucleotide (ASO) therapy targeting tau protein, currently in a Phase 2 clinical study for early Alzheimer's disease [5][6] - The CELIA trial will provide baseline characteristics of participants, contributing to the understanding of tau-targeted therapies [2][7] Group 3: Educational Initiatives - Biogen will host an interactive booth at AAIC to educate attendees on the role of tau in Alzheimer's disease and will launch a new e-learning module on KnowTau.com [4][6] - The educational program aims to bridge research and clinical practice regarding tau therapies and biomarkers [7]

Core Viewpoint - Biogen's investigational Alzheimer's disease drug, BIIB080, has received fast track designation from the FDA, which may expedite its development and review process [1][2]. Group 1: Fast Track Designation Benefits - Fast track designation aims to facilitate the development and expedite the review of drugs addressing serious conditions and unmet medical needs [2]. - The designation allows for rolling review, enabling Biogen to submit completed sections of its regulatory filing for BIIB080 as they become available, potentially speeding up the review process [2]. Group 2: BIIB080 Overview - BIIB080 is an investigational antisense oligonucleotide therapy targeting tau protein, which is linked to neurodegeneration and cognitive decline in Alzheimer's disease [5][6]. - The drug is currently being evaluated in the phase II CELIA study for early-stage Alzheimer's, with patient enrollment recently completed and data expected next year [5][6]. - Previous phase Ib study data indicated that BIIB080 treatment resulted in dose-dependent reductions in tau protein levels in cerebrospinal fluid and decreased tau buildup in the brain, along with positive trends in cognitive and functional measures [6]. Group 3: Partnership and Market Context - BIIB080 is developed in partnership with Ionis Pharmaceuticals, from which Biogen licensed exclusive global rights in December 2019, with Ionis eligible for royalties on potential sales [7]. - In the Alzheimer's drug market, two FDA-approved drugs, Leqembi and Kisunla, are currently available, both targeting amyloid beta plaque accumulation, a primary cause of cognitive decline [8][9].

Core Viewpoint - The FDA has granted Fast Track designation to Biogen's investigational therapy BIIB080 for Alzheimer's disease, highlighting the urgent need for innovative treatments targeting tau pathology [1][2]. Company Overview - Biogen is a leading biotechnology company founded in 1978, focused on pioneering innovative science to deliver new medicines and create value for shareholders and communities [5]. Product Development - BIIB080 is the first tau-targeting antisense oligonucleotide (ASO) therapy in clinical development for Alzheimer's disease, currently evaluated in the global Phase 2 CELIA study for individuals with early-stage disease [2][3]. - Previous Phase 1b study results indicated dose-dependent reductions in soluble tau protein in cerebrospinal fluid and decreases in aggregated tau pathology in the brain, with favorable trends in exploratory clinical outcomes [2][3]. - The Phase 2 CELIA study is fully enrolled, with data readout expected in 2026 [2]. Licensing and Collaboration - In December 2019, Biogen exercised a license option with Ionis Pharmaceuticals to obtain a worldwide, exclusive, royalty-bearing license for the development and commercialization of BIIB080 [4].