Capella—the Online Voice of Progress in RNAi

Alnylam welcomes you to Capella, the destination for updates on our progress in translating the science of RNAi into innovative medicines. For Alnylam, Capella is our online voice for communicating the scientific progress we are making as we work to develop innovative medicines for patients.

We hosted a series of online “RNAi Roundtables” in July, August and September, at which Alnylam scientists and key clinical collaborators reviewed recent progress in many of the company’s development-stage pipeline programs and discussed the related disease areas.

Click on any of the RNAi Roundtables below to listen to the webcasts and view presentations from these events. (more…)

We reported positive initial results from our ongoing Phase 1 clinical trial with ALN-AS1, an investigational RNAi therapeutic targeting aminolevulinic acid synthase 1 (ALAS1) for the treatment of acute hepatic porphyrias. Study results showed that single subcutaneous doses of ALN-AS1 resulted in an up to 82% lowering of ALA and an up to 93% lowering of PBG in asymptomatic “high excreter” (ASHE) patients, who carry the genetic mutation of acute intermittent porphyria (AIP) and have elevated levels of aminolevulinic acid (ALA) and porphobilinogen (PBG), the toxic heme intermediates that mediate porphyria attacks. Furthermore, analysis of exosomal mRNA preparations from serum and urine revealed that treatment resulted in potent, dose-dependent, and durable silencing of liver ALAS1 mRNA.  Importantly, ALN-AS1 was found to be generally well tolerated with no clinically significant drug-related adverse events to date. These data provide human proof-of-concept for ALN-AS1 as a potential therapy for AIP and other acute hepatic porphyrias.


We presented new pre-clinical data supporting the selection of a Development Candidate (DC) for ALN-GO1, an investigational RNAi therapeutic targeting glycolate oxidase (GO), also referred to as hydroxyacid oxidase 1 (HAO1), for the treatment of primary hyperoxaluria type 1 (PH1).  These data were presented at the 48th European Society of Paediatric Nephrology (ESPN) Annual meeting – held September 3 – 5, 2015, in Brussels – showing up to 99% silencing of the HAO1 mRNA and up to 98% mean reduction of urinary oxalate in animal models of PH1.


Alnylam and The Medicines Company reported positive initial results from the ongoing Phase 1 clinical trial with ALN-PCSsc, an investigational RNAi therapeutic targeting PCSK9 for the treatment of hypercholesterolemia.  Subcutaneous administration of ALN-PCSsc resulted in an up to 83% lowering of LDL-C, with an up to 64 ± 5% mean maximum reduction, comparable to published results for anti-PCSK9 monoclonal antibodies (Zhang XL., et al., BMC Med, 2015).  Similar reductions in LDL-C were seen in patients on and off concomitant statin therapy.  The effects of ALN-PCSsc were highly durable, with clinically significant and clamped reductions in LDL-C maintained for over 140 days, supportive of a once-quarterly and possibly bi-annual subcutaneous dose regimen. Maximal lowering effects on LDL-C were consistently achieved at a dose of 300 mg associated with a low injection volume of 1.5 mL. Importantly, ALN-PCSsc was generally well tolerated with no clinically significant adverse events to date.



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