Alnylam announces positive initial phase 2 data with Revusiran Alnylam announced positive initial Phase 2 data with revusiran, an investigational RNAi therapeutic targeting transthyretin for the treatment of TTR cardiac amyloidosis. In the pilot Phase 2 study, revusiran was found to be generally well tolerated in TTR cardiac amyloidosis patients. Revusiran demonstrated clinical activity with an up to 98.2% knockdown of serum TTR – the disease causing protein. This included similar knockdown effects toward wild type and mutant TTR protein within V122I patients, who represent the most common genotype associated with inherited forms of TTR cardiac amyloidosis. In the five week course of treatment, there were no significant changes observed in a number of exploratory clinical measurements. Revusiran utilizes Alnylam’s proprietary GalNAc-conjugate delivery platform that enables subcutaneous delivery of RNAi therapeutics with a wide therapeutic index. The primary objective of the study was to evaluate the safety and tolerability of revusiran. The secondary objectives were to assess the clinical activity of revusiran toward serum levels of TTR and characterize the drug’s pharmacokinetic profile. In addition, a number of exploratory clinical measurements were performed at baseline and days 42 and 90 after start of dosing.