Zymeworks Discontinues ZW171 Mesothelin-Targeted T Cell Engager After Phase 1 Safety Concerns
- Zymeworks voluntarily discontinued clinical development of ZW171, a mesothelin-directed T cell engager for gynecological, thoracic, and digestive system cancers, following completion of Phase 1 dose escalation cohorts.
- The decision was based on dose-limiting toxicities consistent with mesothelin-related on-target off-tumor toxicity that would be unlikely to support an acceptable benefit-risk profile for monotherapy.
- Despite the setback, Zymeworks continues advancing its broader pipeline including ongoing Phase 1 trials of ZW191, planned Phase 1 initiation of ZW251 in 2025, and IND filing preparation for ZW209 in the first half of 2026.
Zymeworks BC Inc.
Posted 9/30/2024