Biotechnology China and Boston, USA-based biotech firm Oncologie has entered into a clinical collaboration with Merck & Co (NYSE: MRK) to evaluate the combination of its investigational drug bavituximab, an antibody that blocks the activity of phosphatidylserine (PS), and Merck's blockbuster anti-PD-1 therapy, Keytruda (pembrolizumab) in patients with advanced gastric or gastroesophageal cancer. 12 August 2019