Alnylam Reports Positive KARDIA-2 Topline Study Results Demonstrating Clinically Significant Blood Pressure Reductions When Zilebesiran is Added to Standard of Care Antihypertensives

Alnylam Pharmaceuticals, Inc. (Nasdaq: ALNY), the leading RNAi therapeutics company, today announced that the KARDIA-2 Phase 2 study of zilebesiran, an investigational RNAi therapeutic targeting liver-expressed angiotensinogen (AGT) in development for the treatment of hypertension, met the primary endpoint showing that zilebesiran resulted in clinically and statistically significant additive, placebo-adjusted reductions in 24-hour mean systolic blood pressure (SBP) at Month 3 as measured by ambulatory blood pressure monitoring (ABPM) in each of three independent patient cohorts receiving the standardized background therapies of either a thiazide-like diuretic (indapamide), calcium channel blocker (amlodipine) or angiotensin receptor blocker (olmesartan). Zilebesiran demonstrated an encouraging safety and tolerability profile when added to these standard of care antihypertensives. The Company believes these findings support further development.

“We are thrilled that a single dose of zilebesiran achieved clinically significant, additional reductions in systolic blood pressure when administered to patients who are not adequately controlled with commonly prescribed antihypertensives,” said Simon Fox, Ph.D., Vice President, Zilebesiran Program Lead at Alnylam. “These KARDIA-2 results, showing durable additional levels of blood pressure reduction on top of what is achieved by standard of care first-line antihypertensives with an encouraging safety profile, reinforce our confidence in zilebesiran’s differentiated profile. We look forward to sharing the full KARDIA-2 data as a late-breaking clinical trial at the upcoming American College of Cardiology Annual Scientific Session.”

The KARDIA-2 Phase 2 study is a randomized, double-blind (DB), placebo-controlled study designed to evaluate the efficacy and safety of zilebesiran, when added to standard of care antihypertensive medications, in adults with mild-to-moderate hypertension. This global, multicenter study enrolled 672 adults with hypertension. Patients who met all inclusion criteria and none of the exclusion criteria during a screening period were first randomized into three different cohorts to receive open-label therapy with olmesartan, amlodipine or indapamide as their protocol-specified background antihypertensive medication during a run-in period of at least four weeks. Following the run-in period, eligible patients were randomized 1:1 to receive 600 mg zilebesiran or placebo in addition to their protocol-specified background antihypertensive medication for six months.