Neena Bitritto-Garg's questions to PROTHENA CORP PUBLIC LTD (PRTA) leadership • Q4 2023
Question
Asked for more detail on the ARIA rates across different patient cohorts (APOE4 status) and the rationale for selecting the higher dose levels (200mg, 400mg) and the expected activity differences.
Answer
The data shared so far is from the 70mg monthly cohort (Cohort A), which showed encouraging amyloid reduction and ARIA rates consistent with placebo. The additional cohorts remain blinded. The dose levels were selected to fully explore the dose-response relationship up to 400mg, which is the purpose of a Phase 1 study.