On August 28, 2014 OncoMed Pharmaceuticals reported that the U.S. Food and Drug Administration (FDA) has removed the partial clinical hold on enrollment in the company’s vantictumab (anti-Fzd7, OMP-18R5) Phase 1 clinical trials (Press release OncoMed, AUG 28, 2014, View Source [SID:1234500712]). Vantictumab is being studied in combination with standard-of-care chemotherapy in three Phase 1b clinical trials in patients with advanced non-small cell lung cancer (NSCLC), advanced HER2-negative breast cancer and advanced pancreatic cancer. 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.

“We are pleased by the FDA’s action to allow the resumption of enrollment in the vantictumab clinical trials,” said Jakob Dupont, MD, OncoMed’s Chief Medical Officer. “Patient safety is our top priority. The revised protocols were developed with input from the vantictumab clinical investigators and academic bone experts and are intended to mitigate the risks of future adverse events as we seek an optimal efficacious dose to take forward in the development of this first-in-class WNT pathway inhibitor.”

The partial clinical hold occurred on July 1, 2014 following the company’s voluntary halt to its Wnt pathway programs due to observed on-target mild-to-moderate bone-related adverse events. The FDA removed the partial clinical hold to permit the enrollment of vantictumab clinical trials following its review of a substantial clinical safety and efficacy data package and revised study protocols submitted by the company. 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.

“The diligence and dedication of OncoMed’s clinical development team to temporarily halt the vantictumab studies and submit a comprehensive response to the FDA has led to a prompt action by the agency,” said Paul J. Hastings, Chairman and Chief Executive Officer of OncoMed. “We look forward to proceeding with the vantictumab Phase 1b clinical studies, and to the potential opt in by our partner Bayer based on data from these trials, to realize the future potential of this novel first-in-class WNT pathway inhibitor.”