REDWOOD CITY, Calif., Sept. 4, 2014 (GLOBE NEWSWIRE) -- OncoMed Pharmaceuticals, Inc. (Nasdaq:OMED), announced today that the U.S. Food and Drug Administration (FDA) removed the partial clinical hold on the company's ipafricept (FZD8-Fc, OMP-54F28) Phase 1 clinical trials. Enrollment and dosing of new patients is expected to resume within the next few weeks as the study sites' institutional review boards (IRBs) receive and approve the revised trial protocols. Ipafricept is being studied in combination with standard-of-care in three Phase 1b studies. "With important input from our clinical investigators and academic bone experts, the OncoMed team has developed modified study parameters intended to avoid potential risks while allowing us to evaluate the therapeutic impact of ipafricept for patients with pancreatic, hepatocellular and ovarian cancers in combination with standard therapy," said Jakob Dupont, MD, OncoMed's Chief Medical Officer. "We appreciate the FDA's prompt response to our submission and their acceptance of our proposed amendments to the trial protocols." OncoMed submitted a substantial clinical safety and efficacy data package for ipafricept along with revised study protocols to the FDA's Division of Oncology Products 1, which resulted in the removal of the partial clinical hold. The amendments for the Phase 1b combination trials include modified dosing regimens, risk mitigation measures, such as increased monitoring and bone protection strategies, and modified enrollment criteria. "We expect enrollment in our first-in-class Wnt pathway programs, ipafricept and vantictumab, to be back underway soon," said Paul J. Hastings, Chairman and Chief Executive Officer of OncoMed. "The Wnt pathway represents a highly promising target for disrupting cancer stem cell activity and inducing tumor differentiation. As we advance ipafricept and vantictumab through clinical studies in combination with standard of care, we expect to generate key data from these Phase 1b studies that will support a potential opt-in by our partner Bayer as well as late-stage clinical development."