Alnylam Pharmaceuticals is a commercial-stage biopharmaceutical company developing therapeutics based on RNA interference (RNAi). RNAi is a biological pathway within cells for sequence-specific silencing and regulation of gene expression. Co. has two RNAi-based medicines, ONPATTRO® (patisiran) and GIVLAARI® (givosiran). ONPATTRO is approved by the United States Food and Drug Administration (FDA) for the treatment of the polyneuropathy of hereditary transthyretin-mediated amyloidosis in adults and has also been approved in the European Union, Japan, Canada and Switzerland. GIVLAARI is approved by FDA for the treatment of adults with acute hepatic porphyria.