Merck KGaA and Pfizer have entered into a collaboration Syndax Pharmaceuticals to evaluate avelumab, an investigational fully human anti-PD-L1 IgG1 monoclonal antibody, in combination with Syndax’s entinostat, an investigational oral small molecule that targets immune regulatory cells (myeloid-derived suppressor cells and regulatory T-cells), in patients with heavily pre-treated, recurrent ovarian cancer. Avelumab is currently being investigated across a broad range of tumor types under the alli...