Zymeworks (ZYME) Soars on Positive Phase 3 Ziihera Data in Gastric Cancer – What Today’s Breakthrough Means for the Stock and Patients
What Zymeworks Announced Today Before the U.S. market open on November 17, 2025, Vancouver‑based Zymeworks Inc. (ZYME) released topline Phase 3 data from its pivotal HERIZON‑GEA‑01 study, evaluating Ziihera (zanidatamab‑hrii) in first‑line treatment of HER2‑positive locally advanced or metastatic gastroesophageal