New Data From Landmark HELIOS-B Phase 3 Study Presented at ESC Congress 2025 Demonstrate Vutrisiran’s Long-Term Cardiovascular Benefit in ATTR-CM

− Sustained Benefit of Vutrisiran Across Mortality, Cardiovascular Events, Quality of Life and Cardiac Biomarkers Observed Through Up to 48 Months, Including 12 Months from the Ongoing Open-Label Extension, Reinforce Potential as First-Line Treatment for ATTR-CM –

− Vutrisiran, which Delivers Rapid Knockdown of Transthyretin, Reduced the Risk of Composite of All-Cause Mortality or First Cardiovascular Event by 37% in the Overall Population and 42% in the Monotherapy Group During the Same Period –

CAMBRIDGE, Mass.--(BUSINESS WIRE)-- Alnylam Pharmaceuticals, Inc. (Nasdaq: ALNY), the leading RNAi therapeutics company, today announced results of new analyses from the HELIOS-B Phase 3 study of AMVUTTRA® (vutrisiran), an RNAi therapeutic approved for the treatment of the cardiomyopathy of wild-type or hereditary transthyretin-mediated amyloidosis (ATTR-CM) in adults. Data from the 12-month follow-up of the ongoing open-label extension (OLE) period of HELIOS-B were presented during an oral session at the European Society of Cardiology (ESC) Congress 2025 held in Madrid, Spain. These data reflect outcomes of treatment through up to 48 months, including the initial double-blind period of 33-36 months, and highlight the ongoing clinical benefit of vutrisiran, which causes rapid knockdown of the disease-causing transthyretin (TTR) protein, including a 37% risk reduction in the composite endpoint of all-cause mortality (ACM) or first cardiovascular (CV) event in the overall population (p