Zymeworks Inc. (NYSE: ZYME), a clinical-stage biopharmaceutical company developing multifunctional biotherapeutics, today announced the release of an abstract by ESMO with preliminary results from the company’s Phase 1 study of zanidatamab zovodotin (ZW49), an investigational novel bispecific HER2 targeted antibody-drug conjugate.
Results from the study entitled “Preliminary Results From a Phase 1 Study Using the Bispecific, Human Epidermal Growth Factor 2 (HER2)-targeting Antibody-drug Conjugate (ADC) zanidatamab zovodotin (ZW49) in Solid Cancers” will be presented by Komal Jhaveri, MD, FACP, Medical Oncologist, Memorial Sloan Kettering Cancer Center in NYC, in a mini-oral presentation on Monday, September 12 at 5:25 pm CEST during the ESMO meeting being held September 9-13, 2022, at the Paris Expo Porte de Versailles in Paris, France.
“Treatment of HER2-expressing solid cancers remains an area with significant unmet need, and these preliminary Phase 1 clinical results for zanidatamab zovodotin (ZW49) show that it offers a manageable safety profile and encouraging single-agent anti-tumor activity in patients with advanced disease that has progressed after treatment with standard of care therapies,” said Dr. Jhaveri. “We look forward to continuing enrollment in the trial and to reporting on additional data as it becomes available in the months ahead.”
In an ongoing Phase 1 study of 76 patients with HER2+ cancers including gastric (28%) and breast (22%) cancers, preliminary results show that the majority of treatment related adverse events (TRAEs) were Grade 1 or 2 and included keratitis (42%), alopecia (25%) and diarrhea (21%). Among seven patients who experienced TRAEs of grade 3 or higher, two were grade 4 events including infusion-related reaction and decreased neutrophil count. There were three patient discontinuations associated with TRAEs and no reported treatment-related patient deaths or cases of interstitial lung disease. Results also showed encouraging single-agent anti-tumor activity in heavily pretreated patients with HER2+ cancers, including a confirmed objective response rate of 28% and a disease control rate of 72% in 29 patients treated at a dose of 2.5 mg/kg on an every three week (Q3W) schedule.
“We are excited to share our preliminary results from the ongoing Phase 1 study at ESMO,” said Kenneth Galbraith, Chair and CEO of Zymeworks. “We look forward to Dr. Jhaveri’s presentation of updated study results on September 12th in Paris and discussing the future development of zanidatamab zovodin, on our conference call and webcast following the ESMO presentation.”