Paul J. Hastings, Chairman and Chief Executive Officer of OncoMed, commented, "We are pleased to share these clinical and biomarker data from 4 of our 5 clinical-stage drugs suggesting single and combination agent safety, and early signs of efficacy. All five of our clinical programs are in excellent positions to take the next step toward randomized proof-of-concept studies."About Cancer Stem Cells Cancer stem cells, or CSCs, are the subpopulation of cells in a tumor responsible for driving growth and metastasis of the tumor. CSCs, also known as tumor-initiating cells, exhibit certain properties which include the capacity to divide and give rise to new CSCs via a process called self-renewal and the capacity to differentiate or change into the other cells that form the bulk of the tumor. Common cancer drugs target bulk tumor cells but have limited impact on CSCs, thereby providing a path for recurrence of the tumor. OncoMed's product candidates target CSCs by blocking self-renewal and driving differentiation of CSCs toward a non-tumorigenic state, and also impact bulk tumor cells. OncoMed believes its product candidates are distinct from the current generations of chemotherapies and targeted therapies, and have the potential to significantly impact cancer treatment and the clinical outcome of patients with cancer. About Demcizumab (OMP-21M18) Demcizumab (OMP-21M18) is a humanized monoclonal antibody that inhibits Delta-Like Ligand 4 (DLL4) in the Notch signaling pathway. Two Phase 1b combination trials of demcizumab are ongoing. The first trial is in combination with standard-of-care gemcitabine and Abraxane™ in first-line advanced pancreatic cancer patients, and the second trial is in combination with standard-of-care carboplatin and pemetrexed (Alimta™) in first-line advanced non-small cell lung cancer (NSCLC) patients. Data from the demcizumab NSCLC and pancreatic cancer Phase 1b trials were presented at the AACR-NCI-EORTC International Conference on Molecular Targets and Cancer Therapeutics in Boston, MA, in October 2013. In addition, a Phase 1b/2 trial of demcizumab and paclitaxel in patients with platinum-resistant ovarian cancer is ongoing at MD Anderson Cancer Center. OncoMed has worldwide rights to this program.