Stephen Willey's questions to Zymeworks Inc (ZYME) leadership • Q2 2025
Question
Stephen Willey from Stifel asked for Zymeworks' perspective on the clinical data for pasaritamab, a partnered asset with J&J, noting its favorable tolerability but lower PSA50 rates compared to other PSMA-targeting bispecifics, and questioned what drives the molecule's unique profile.
Answer
Chief Scientific Officer Paul Moore attributed the molecule's excellent tolerability to the novel KLK2 target, which provides a superior therapeutic window. He suggested this profile makes the drug a strong candidate for combination therapies to boost efficacy, a strategy J&J is actively exploring. He also noted that CD3 binder affinity is tailored to each specific target.