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OncoMed Pharmaceuticals Presents Updated Phase 1a Data In Advanced Solid Tumor Patients For The First-in-Class WNT-Pathway-Targeting Antibody Vantictumab (OMP-18R5) At The European Cancer Congress 2013

Vantictumab is well tolerated and has surpassed the target efficacious dose from preclinical models

Vantictumab has pharmacodynamic effect on the WNT-pathway and evidence of single-agent activity

Vantictumab is advancing to combination Phase 1b studies in selected tumor types

REDWOOD CITY, Calif., Sept. 29, 2013 (GLOBE NEWSWIRE) -- OncoMed Pharmaceuticals, Inc. (Nasdaq:OMED), a clinical-stage company developing novel therapeutics that target cancer stem cells (CSCs), or tumor-initiating cells, today reported new data for vantictumab, a monoclonal antibody targeting the WNT pathway, at a poster session at the Joint ECCO 17, 38th ESMO and 32nd ESTRO European Cancer Congress 2013 (ECC 2013) in Amsterdam, The Netherlands.

In the ongoing Phase 1a clinical trial, 29 patients with advanced and refractory solid tumors were treated with single-agent vantictumab. To date the drug candidate has been well tolerated up to the current dose of 15 mg/kg every three weeks. This dose of vantictumab is above the target efficacious dose based on minimally passaged human tumor xenograft models. Vantictumab shows pharmacodynamic (PD) effects on the WNT-pathway in patient samples in the Phase 1 clinical trial. Evidence of single-agent activity of vantictumab is noted in several patients with neuroendocrine tumors (NETs). Based on these clinical results and data from preclinical patient-derived tumor models, OncoMed is initiating Phase 1b clinical trials in three tumor indications to study its safety in combination with standard-of-care chemotherapy. Vantictumab is part of OncoMed's Wnt pathway collaboration with Bayer Pharma AG.

Jakob Dupont, M.D., OncoMed's Chief Medical Officer commented, "We are encouraged that vantictumab can be administered safely in this study to patients at doses above the target efficacious doses extrapolated from our preclinical models. These results enable the advancement of vantictumab to three Phase 1b trials later this year."

"With ongoing clinical trials with five novel drug candidates in two key pathways, Notch and WNT, OncoMed is leading the way in the development of anti-cancer stem cell therapies," said Paul J. Hastings, Chairman and Chief Executive Officer of OncoMed.

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