U.S. FDA Approves Ziihera® (zanidatamab-hrii) with and without Tislelizumab plus Chemotherapy in First-Line HER2+ Advanced Gastroesophageal Adenocarcinoma

VANCOUVER, British Columbia, Aug. 25, 2026 (GLOBE NEWSWIRE) -- Zymeworks Inc. (Nasdaq:ZYME), a biotechnology company managing a portfolio of licensed healthcare assets while developing a diverse pipeline of novel, multifunctional biotherapeutics, today announced that its partner, Jazz Pharmaceuticals, has received U.S. Food and Drug Administration (FDA) approval for two Ziihera® (zanidatamab-hrii)-containing regimens for the first-line treatment of adults with unresectable locally advanced or metastatic HER2-positive (HER2+) gastroesophageal adenocarcinoma (GEA): Ziihera plus Tevimbra® (tislelizumab-jsgr) and fluoropyrimidine- and platinum-containing chemotherapy (HER2+ IHC 3+ and IHC 2+/ISH+), and Ziihera plus fluoropyrimidine- and platinum-containing chemotherapy (HER2+ IHC 3+).