Phase 2 Study of Intrathecal ALN-APP to Treat Cerebral Amyloid Angiopathy Evaluating Safety, Effectiveness, and Pharmacodynamics in Adults

What this Trial Is About

Researchers are evaluating the effects of ALN-APP on disease progression in adults with sporadic Cerebral Amyloid Angiopathy sCAA and Dutch-type Cerebral Amyloid Angiopathy D-CAA. This Phase 2 study aims to assess the safety, tolerability, and pharmacodynamics of ALN-APP in these patient groups. The study is sponsored by Alnylam Pharmaceuticals and includes a randomized, double-blind, placebo-controlled design. Participants will receive multiple doses of ALN-APP or placebo administered intrathecally during a 24-month double-blind treatment period. Those who continue into an optional 18-month open-label extension will receive ALN-APP. The study involves two main periods the initial double-blind treatment phase followed by an optional open-label extension. During the study, participants will undergo brain MRIs to measure new cerebral microbleeds and other brain changes. Researchers will also assess cerebrovascular vasoreactivity using functional MRI and measure amyloid precursor protein levels in cerebrospinal fluid. Safety and adverse events will be monitored throughout the up to 50 months of participation, which includes screening, treatment, and safety follow-up.

A Phase 2 Trial of ALN-APP in Patients With Cerebral Amyloid Angiopathy